IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
GENERAL DESCRIPTION
FEATURES
The IDTF2250 is a low insertion loss Voltage Variable
RF Attenuator (VVA) designed for a multitude of
wireless and other RF applications. This device covers
a broad frequency range from 50MHz to 6000MHz. In
addition to providing low insertion loss, the IDTF2250
provides excellent linearity performance over its entire
voltage control and attenuation range.
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The F2250 uses a single positive supply voltage of
3.15V to 5.25V. Other features include the VMODE pin
allowing either positive or negative voltage control
slope vs attenuation and multi-directional operation
meaning the RF input can be applied to either RF1 or
RF2 pins. Control voltage ranges from 0V to 2.8V
using either positive or negative control voltage slope.
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COMPETITIVE ADVANTAGE
VDD
VMODE
Control

Insertion Loss @ 2000MHz: 1.4dB vs. 2.8dB

Insertion Loss @ 6000MHz: 2.7dB vs. 7dB

Maximum Attenuation Slope: 33dB/Volt vs. 53dB/Volt

Minimum Return Loss up to 6000MHz: 12.5dB vs. 7dB

Minimum Output IP3: 31dBm vs. 15dBm

Minimum Input IP2: 87dBm vs. 80dBm

Maximum Operating Temperature: +105°C vs. +85°C
RF2
RF1
ORDERING INFORMATION
APPLICATIONS
Omit IDT
prefix
Tape &
Reel
0.8 mm height
package
IDTF2250NLGK8
Base Station 2G, 3G, 4G,
Portable Wireless
Repeaters and E911 systems
Digital Pre-Distortion
Point to Point Infrastructure
Public Safety Infrastructure
WIMAX Receivers and Transmitters
Military Systems, JTRS radios
RFID handheld and portable readers
Cable Infrastructure
Wireless LAN
Test / ATE Equipment
Voltage Variable RF Attenuator
VCTRL
DEVICE BLOCK DIAGRAM
IDTF2250 provides extremely low insertion loss and
superb IP3, IP2, Return Loss and Slope Linearity across
the control range. Comparing to the previous state-ofthe-art for silicon VVAs this device is better as follows:
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Low Insertion Loss: 1.4dB @ 2000MHz
Typical / Min IIP3: 65dBm / 47dBm
Typical / Min IIP2: 95dBm / 87dBm
33.6dB Attenuation Range
Bi-directional RF ports
+34.4dBm Input P1dB compression
VMODE pin allows either positive or negative
attenuation control response
Linear-in-dB attenuation characteristic
Supply voltage: 3.15V to 5.25V
VCTRL range: 0V to 2.8V
+105°C max operating temperature
3x3, 16-pin TQFN package
Green
RF Product Line
Temp Range
PART# MATRIX
Part#
1
RF Freq Range
(MHz)
Insertion Loss
@ 2GHz (dB)
(dBm)
IIP3
Pinout
Compatibility
F2250
50 - 6000
1.4
+65
RFSA2023
F2255
20 - 2000
1.4
+65
F2258
50 - 6000
1.4
+65
HMC973LP3E
REV 2, May 2015
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
ABSOLUTE MAXIMUM RATINGS
Parameter / Condition
VDD to GND
VMODE to GND
VCTRL to GND
VDD = 0V to 3.45V
VDD = >3.45V to 5.25V
RF1, RF2 to GND
RF1 or RF2 Input Power applied for 24 hours maximum
(VDD applied @ 2GHz and +85°C)
RF1 or RF2 Continuous Operating Power
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature (soldering, 10s)
ESD Voltage– HBM (Per ESD STM5.1-2007)
ESD Voltage – CDM (Per ESD STM5.3.1-2009)
Symbol
VDD
VMODE
VCTRL
VCTRL
VRF
Min
-0.3
-0.3
-0.3
-0.3
-0.3
Max
5.5
Minimum ( VDD, 3.9 )
VDD -0.3
0.6* VDD
0.3
Units
V
V
PMAX24
30
dBm
PMAX_OP
TJMAX
TST
TLEAD
VESDHBM
VESDCDM
See Figure 1
+150
+150
+260
Class 1C
Class C1
dBm
°C
°C
°C
-65
V
V
FIGURE 1: MAXIMUM RF INPUT POWER VS. RF FREQUENCY
Stresses above those listed above may cause permanent damage to the device. Functional operation of the device at
these or any other conditions above those indicated in the operational section of this specification is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
PACKAGE THERMAL AND MOISTURE CHARACTERISTICS
ΘJA (Junction – Ambient)
ΘJC (Junction – Case) The Case is defined as the exposed paddle
Moisture Sensitivity Rating (Per J-STD-020)
Voltage Variable RF Attenuator
2
80.6°C/W
5.1°C/W
MSL 1
REV 2, May 2015
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
IDTF2250 OPERATING CONDITIONS
Parameter
Symbol
Operating Freq Range
Supply Voltage
VIH
VMODE Logic
VIL
VCTRL
IDD
IMODE
ICTRL
VCTRL Range
Supply Current
Logic Current
ICTRL Current
RF Operating Power
FRF
VDD
3
RF1 Port Impedance
RF2 Port Impedance
Operating Temperature
Range
PMAX,
Condition
VDD > 3.9V
VDD = 3.15 to 3.9V
Positive or negative slope
Min
Typ
50
3.15
1.17
1.17
0
0
0.901
-1
-1
1.17
CW
ZRF1
ZRF2
TCASE
Max
Units
6000
5.25
3.62
VDD -0.3V
0.63
2.8
MHz
V
V
1.40
24
10
V
mA
μA
μA
See
Figure 1
dBm
50
50
Exposed Paddle
Temperature
-40
Ω
+105
Operating Conditions Notes:
1 – Items in min/max columns in bold italics are Guaranteed by Test.
2 – Items in min/max columns that are not bold/italics are Guaranteed by Design Characterization.
3 – Refer to the Maximum Operating RF Input Power vs. RF Frequency curves in Figure 1.
Voltage Variable RF Attenuator
3
REV 2, May 2015
°C
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
IDTF2250 SPECIFICATION
Refer to EVKit / Applications Circuit, VDD = +3.3V, TC = +25°C, signals applied to RF1 input, FRF = 2000MHz,
minimum attenuation, PIN = 0dBm for small signal parameters, +20dBm for single tone linearity tests, +20dBm per
tone for two tone tests, two tone delta frequency = 50MHz, PCB board traces and connector losses are de-embedded
unless otherwise noted. Refer to Typical Operating Curves for performance over entire frequency band.
Parameter
Insertion Loss, IL
Maximum Attenuation
Insertion Phase Δ
Symbol
AMIN
AMAX
ΦΔMAX
ΦΔMID
Input 1dB Compression3
P1dB
Minimum RF1 Return Loss
over control voltage range
S11
Minimum RF2 Return Loss
over control voltage range
S22
Input IP3
Input IP3 over Attenuation
Minimum Output IP3
IIP3
IIP3ATTEN
OIP3MIN
Input IP2
Minimum Input IP2
Input IH2
Input IH3
Settling Time
IIP2
IIP2MIN
HD2
HD3
TSETTL0.1dB
Comment
Minimum Attenuation
Min
Typ
342
1.4
35
At 36dB attenuation
relative to Insertion Loss
At 18dB attenuation
relative to Insertion Loss
1.9 1
Units
dB
dB
27
deg
10
50MHz4
700MHz
2000MHz
6000MHz
50MHz4
700MHz
2000MHz
6000MHz
All attenuation settings
Maximum attenuation
PIN + IM2dBC,
IM2 term is F1+F2
All attenuation settings
PIN + H2dBc
PIN + (H3dBc/2)
Any 1dB step in the 0dB
to 33dB control range
50% VCTRL to RF settled to
within ± 0.1dB
Max
44
34.4
16
17
17
15
16
15
16
13
65
47
35
dBm
95
dBm
87
90
54
dBm
dBm
dBm
15
µsec
dB
dB
dBm
Specification Notes:
1 – Items in min/max columns in bold italics are Guaranteed by Test
2 – Items in min/max columns that are not bold/italics are Guaranteed by Design Characterization.
3 – The input 1dB compression point is a linearity figure of merit. Refer to Absolute Maximum Ratings section
along with Figure 1 for the maximum RF input power vs. RF frequency.
4 – Set blocking capacitors C7 & C8 to 0.01uF to achieve best return loss performance at 50MHz.
Voltage Variable RF Attenuator
4
REV 2, May 2015
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
TYPICAL OPERATING CONDITIONS
Unless otherwise noted, the following conditions apply:
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VDD = +3.3V or +5.0V
TC = +25ºC
VMODE = 0V
RF trace and connector losses are de-embedded for S-parameters
Pin = 0dBm for all small signal tests
Pin = +20dBm for single tone linearity tests (RF1 port driven)
Pin = +20dBm/tone for two tone linearity tests (RF1 port driven)
Two tone frequency spacing = 50MHz
Voltage Variable RF Attenuator
5
REV 2, May 2015
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
TYPICAL OPERATING CONDITIONS [S2P BROADBAND PERFORMANCE] (-1-)
Attenuation vs. VCTRL
Attenuation vs. Frequency
0
0
-10
-10
Attenuation (dB)
Attenuation (dB)
-5
0.9GHz / Vmode = 0V
0.9GHz / Vmode = 3V
-15
2.0GHz / Vmode = 0V
2.0GHz / Vmode = 3V
-20
3.0GHz / Vmode = 0V
3.0GHz / Vmode = 3V
-25
-30
-20
-30
-40
-35
-40
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
-50
2.2 2.4 2.6
Vctrl = 0.8V
Vctrl = 1.0V
Vctrl = 1.2V
Vctrl = 1.4V
Vctrl = 1.6V
Vctrl = 1.8V
Vctrl = 2.4V
0
VCTRL (V)
1
2
3
4
5
6
7
8
9
Frequency (GHz)
Min. & Max. Attenuation vs. Frequency
0
Attenuation Delta to 25C vs. Frequency
3.00
-20
-40C / Vctrl = 0.0V
2.50
105C / Vctrl = 0.0V
-25
-40C / Vctrl = 3.0V
25C / Vctrl = 3.0V
105C / Vctrl = 3.0V
-2
-30
-3
-35
-4
-40
-5
-45
-6
-50
Max. Attenuation (dB)
-1
Attenuation Delta to 25C (dB)
25C / Vctrl = 0.0V
Min. Attenuation (dB)
Vctrl = 0.0V
2.00
-40C / 0.9GHz
-40C / 2.0GHz
-40C / 3.0GHz
105C / 0.9GHz
105C / 2.0GHz
105C / 3.0GHz
1.50
1.00
0.50
0.00
-0.50
-1.00
-1.50
-2.00
-2.50
0
1
2
3
4
5
6
7
8
-3.00
9
0.0
Frequency (GHz)
Voltage Variable RF Attenuator
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
VCTRL (V)
6
REV 2, May 2015
2.2
2.4
2.6
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
TYPICAL OPERATING CURVES [S2P vs. VCTRL] (-2-)
Attenuation vs. VCTRL
Attenuation Slope vs. VCTRL
0
Attenuation Slope (dB/V)
1.5GHz
2.7GHz
-10
4.0GHz
5.0GHz
-15
0.4GHz
45
0.7GHz
-5
Attenuation (dB)
50
0.4GHz
6.0GHz
-20
-25
-30
-35
0.7GHz
1.5GHz
40
2.7GHz
4.0GHz
35
5.0GHz
30
6.0GHz
25
20
15
10
5
0
-40
0.5
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6
0.7
0.9
1.1
RF1 Return Loss vs. VCTRL
1.7
1.9
0
0.4GHz
0.7GHz
-5
2.1
1.5GHz
2.7GHz
-10
4.0GHz
5.0GHz
-15
0.4GHz
0.7GHz
-5
RF2 Return Loss (dB)
RF1 Return Loss (dB)
1.5
RF2 Return Loss vs. VCTRL
0
6.0GHz
-20
-25
-30
1.5GHz
2.7GHz
-10
4.0GHz
5.0GHz
-15
6.0GHz
-20
-25
-30
-35
-35
-40
-40
0.0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6
0.2
0.4
0.6
0.8
1.0
0.4GHz
1.4
1.6
1.8
2.0
2.2
100
0.7GHz
Insertion Phase Slope (deg/V)
1.5GHz
2.7GHz
50
4.0GHz
5.0GHz
40
6.0GHz
30
20
10
0
-10
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
1.5GHz
80
2.7GHz
4.0GHz
60
5.0GHz
6.0GHz
40
20
0
-20
2.6
0.6
VCTRL (V)
Voltage Variable RF Attenuator
2.6
0.4GHz
(positive phase = electrically shorter)
0.7GHz
60
2.4
Insertion Phase Slope vs. VCTRL
Insertion Phase  vs. VCTRL
70
1.2
VCTRL (V)
VCTRL (V)
Insertion Phase  (deg)
1.3
VCTRL (V)
VCTRL (V)
0.8
1.0
1.2
1.4
1.6
1.8
VCTRL (V)
7
REV 2, May 2015
2.0
2.2
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
TYPICAL OPERATING CONDITIONS [S2P VS. VCTRL & TEMPERATURE] (-3-)
Attenuation Response vs. VCTRL
Attenuation Slope vs. VCTRL
0
Attenuation Slope (dB/V)
105C / 0.9GHz
-40C / 2.0GHz
-10
25C / 2.0GHz
105C / 2.0GHz
-15
-40C / 3.0GHz
25C / 3.0GHz
-20
-40C / 0.9GHz
25C / 0.9GHz
45
25C / 0.9GHz
-5
Attenuation (dB)
50
-40C / 0.9GHz
105C / 3.0GHz
-25
-30
-35
105C / 0.9GHz
40
-40C / 2.0GHz
25C / 2.0GHz
35
105C / 2.0GHz
30
-40C / 3.0GHz
25C / 3.0GHz
25
105C / 3.0GHz
20
15
10
5
-40
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6
0.6
0.8
1.0
1.2
VCTRL (V)
0
-10
-40C / 0.9GHz
-40C / 2.0GHz
-40C / 3.0GHz
25C / 0.9GHz
25C / 2.0GHz
25C / 3.0GHz
105C / 0.9GHz
105C / 2.0GHz
105C / 3.0GHz
-5
RF2 Return Loss (dB)
RF1 Return Loss (dB)
-5
-15
-20
-25
-30
1.8
2.0
2.2
-10
-40C / 0.9GHz
-40C / 2.0GHz
-40C / 3.0GHz
25C / 0.9GHz
25C / 2.0GHz
25C / 3.0GHz
105C / 0.9GHz
105C / 2.0GHz
105C / 3.0GHz
-15
-20
-25
-30
-35
-35
-40
-40
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6
VCTRL (V)
VCTRL (V)
Insertion Phase Slope vs. VCTRL
Insertion Phase  vs. VCTRL
50
70
-40C / 0.9GHz
(positive phase = electrically shorter)
Insertion Phase Slope (deg/V)
25C / 0.9GHz
45
105C / 0.9GHz
Insertion Phase  (deg/V)
1.6
RF2 Return Loss vs. VCTRL
RF1 Return Loss vs. VCTRL
0
1.4
VCTRL (V)
40
-40C / 2.0GHz
25C / 2.0GHz
35
105C / 2.0GHz
30
-40C / 3.0GHz
25C / 3.0GHz
25
105C / 3.0GHz
20
15
10
5
0
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
-40C / 2.0GHz
-40C / 3.0GHz
25C / 0.9GHz
25C / 2.0GHz
25C / 3.0GHz
105C / 0.9GHz
105C / 2.0GHz
105C / 3.0GHz
50
40
30
20
10
0
2.6
0.6
VCTRL (V)
Voltage Variable RF Attenuator
60
-40C / 0.9GHz
0.8
1.0
1.2
1.4
1.6
1.8
VCTRL (V)
8
REV 2, May 2015
2.0
2.2
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
TYPICAL OPERATING CONDITIONS [S2P VS. ATTENUATION & TEMPERATURE] (-4-)
RF1 Return Loss vs. Attenuation
RF1 Return Loss vs. Attenuation
0
0
0.4GHz
0.7GHz
-5
-5
1.5GHz
4.0GHz
-10
RF1 Return Loss (dB)
RF1 Return Loss (dB)
2.7GHz
5.0GHz
6.0GHz
-15
-20
-25
-30
-10
-40C / 0.9GHz
-40C / 2.0GHz
-40C / 3.0GHz
25C / 0.9GHz
25C / 2.0GHz
25C / 3.0GHz
105C / 0.9GHz
105C / 2.0GHz
105C / 3.0GHz
-15
-20
-25
-30
-35
-35
-40
-40
0
4
8
12
16
20
24
28
32
0
36
4
8
12
RF2 Return Loss vs. Attenuation
24
28
32
36
0
0.4GHz
0.7GHz
-5
-5
1.5GHz
2.7GHz
4.0GHz
-10
RF2 Return Loss (dB)
RF2 Return Loss (dB)
20
RF2 Return Loss vs. Attenuation
0
5.0GHz
6.0GHz
-15
-20
-25
-30
-35
-10
-40C / 0.9GHz
-40C / 2.0GHz
-40C / 3.0GHz
25C / 0.9GHz
25C / 2.0GHz
25C / 3.0GHz
105C / 0.9GHz
105C / 2.0GHz
105C / 3.0GHz
-15
-20
-25
-30
-35
-40
0
4
8
12
16
20
24
28
32
-40
36
0
4
8
Attenuation (dB)
70
45
(positive phase = electrically shorter)
1.5GHz
2.7GHz
40
Insertion Phase  (dB)
4.0GHz
5.0GHz
6.0GHz
40
20
24
28
32
36
50
0.7GHz
50
16
Insertion Phase Δ vs. Attenuation
0.4GHz
60
12
Attenuation (dB)
Insertion Phase Δ vs. Attenuation
Insertion Phase  (deg)
16
Attenuation (dB)
Attenuation (dB)
30
20
10
0
-40C / 0.9GHz
-40C / 2.0GHz
-40C / 3.0GHz
25C / 0.9GHz
25C / 2.0GHz
25C / 3.0GHz
105C / 0.9GHz
105C / 2.0GHz
105C / 3.0GHz
35
30
25
20
15
10
5
0
-10
0
4
8
12
16
20
24
28
32
36
Voltage Variable RF Attenuator
0
4
8
12
16
20
24
28
Attenuation (dB)
Attenuation (dB)
9
REV 2, May 2015
32
36
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
TYPICAL OPERATING CONDITIONS [S2P VS. FREQUENCY] (-5-)
Min. & Max. Attenuation Slope vs. Frequency
-23
-1
-25
-2
-27
-3
-29
-4
-31
-5
-33
-6
-35
-7
-8
0
-40C / Vctrl = 0V
25C / Vctrl = 0V
105C / Vctrl = 0V
-40C / Vctrl = 3V
25C / Vctrl = 3V
105C / Vctrl = 3V
1
2
3
4
5
50
-37
Min./Max. Atenuation Slope (dB/V)
0
Max. Attenuation (dB)
Min. Attenuation (dB)
Min. & Max. Attenuation vs. Frequency
-39
Max. Slope
45
40
35
30
20
15
10
6
0
Worst-Case RF2 Return Loss (dB)
Worst-Case RF1 Return Loss (dB)
105C
-10
-15
-20
-25
2
3
4
5
6
-40C
105C
-5
-10
-15
-20
0
1
2
3
4
5
6
Frequency (GHz)
Gain Compression vs. Frequency
1
-40C
(positive phase = electrically shorter)
25C
105C
0.5
50MHz
100MHz
200MHz
400MHz
1000MHz
2000MHz
4000MHz
6000MHz
500MHz
50
Gain Compression (dB)
Max. Insertion Phase  (deg)
5
-25
6
Max. Insertion Phase  vs. Frequency
60
4
25C
Frequency (GHz)
70
3
0
25C
1
2
Worst-Case RF2 Return Loss vs. Frequency
-40C
0
1
Frequency (GHz)
Worst-Case RF1 Return Loss vs. Frequency
-5
VCTRL varied from 0.8V to 1.8V
25
Frequency (GHz)
0
Min. Slope
40
30
20
10
0
-10
0
1
2
3
4
5
6
Frequency (GHz)
Voltage Variable RF Attenuator
0
-0.5
-1
-1.5
-2
14
16
18
20
22
24
26
28
30
32
34
RF Input Power (dBm)
10
REV 2, May 2015
36
38
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
TYPICAL OPERATING CONDITIONS [S2P @ LOW FREQUENCY, GROUP DELAY] (-6-)
Min. & Max. Attenuation vs. Low Frequency
0
-40C / Vctrl = 0V
-40C / Vctrl = 3V
25C / Vctrl = 0V
25C / Vctrl = 3V
Low-Frequency Attenuation vs. VCTRL
105C / 43MHz
(C7,C8 set to 0.1uF)
-10
-5
-30
-6
-34
-35
-38
-40
100
200
300
Frequency (MHz)
400
-5
-40C / 43MHz
25C / 43MHz
105C / 43MHz
-40C / 128MHz
25C / 128MHz
105C / 128MHz
-40C / 255MHz
25C / 255MHz
105C / 255MHz
-30
(C7,C8 set to 0.1uF)
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
VCTRL (V)
2
2.2 2.4 2.6
Low-Frequency RF2 Return Loss vs. VCTRL
0
-5
RF2 Return Loss (dB)
-10
-15
-20
-25
-30
-35
105C / 255MHz
-25
500
Low-Frequency RF1 Return Loss vs. VCTRL
0
25C / 255MHz
-20
-26
0
-40C / 255MHz
-15
-4
-7
25C / 128MHz
105C / 128MHz
Attenuation (dB)
-22
-40C / 128MHz
Max. Attenuation (dB)
-18
-3
RF1 Return Loss (dB)
25C / 43MHz
-14
-2
-40C / 43MHz
25C / 43MHz
105C / 43MHz
-40C / 128MHz
25C / 128MHz
105C / 128MHz
-40C / 255MHz
25C / 255MHz
105C / 255MHz
-10
-15
-20
-25
-30
-35
(C7,C8 set to 0.1uF)
-40
(C7,C8 set to 0.1uF)
-40
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
VCTRL (V)
2
2.2 2.4 2.6
0
Worst-Case Return Loss vs. Low Frequency
0
0.2 0.4 0.6 0.8
1
100
-40C / RF2
Group Delay (ps)
25C / RF2
(C7,C8 set to 0.1uF)
2
2.2 2.4 2.6
-40C / Insertion Loss
90
25C / Insertion Loss
80
-40C / Max. Attenuation
105C / Insertion Loss
105C / RF1
-5
1.2 1.4 1.6 1.8
VCTRL (V)
Group Delay vs. VCTRL
-40C /RF1
25C / RF1
Worst-Case Return Loss (dB)
-40C / 43MHz
-5
-1
Min. Attenuation (dB)
0
-10
105C / Vctrl = 0V
105C / Vctrl = 3V
105C / RF2
-10
-15
25C / Max. Attenuation
70
105C / Max. Attenuation
60
50
40
30
20
10
-20
0
100
200
300
400
0
500
0
Frequency (MHz)
Voltage Variable RF Attenuator
1
2
3
4
5
Frequency (MHz)
11
REV 2, May 2015
6
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
TYPICAL OPERATING CONDITIONS 2GHZ, VDD=3.3V [IP3, IP2, IH2, IH3 VS. VCTRL, VMODE] (-7-)
Input IP3 vs. VCTRL
Output IP3 vs. VCTRL
80
75
75
70
65
70
60
60
55
50
-40C / Vmode = 0V
45
25C / Vmode = 0V
105C / Vmode = 0V
40
55
Output IP3 (dBm)
Input IP3 (dBm)
65
50
45
40
35
-40C / Vmode= 3V
35
25C / Vmode= 3V
105C / Vmode= 3V
30
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
25C / Vmode = 0V
25
105C / Vmode = 0V
20
-40C / Vmode= 3V
15
25C / Vmode= 3V
105C / Vmode= 3V
10
2.2 2.4 2.6
0
VCTRL (V)
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
2.2 2.4 2.6
VCTRL (V)
Input IP2 vs. VCTRL
Output IP2 vs. VCTRL
120
120
110
110
100
100
Output IP2 (dBm)
Input IP2 (dBm)
-40C / Vmode = 0V
30
90
80
-40C / Vmode = 0V
70
25C / Vmode = 0V
-40C / Vmode = 0V
25C / Vmode = 0V
105C / Vmode = 0V
-40C / Vmode = 3V
25C / Vmode = 3V
105C / Vmode = 3V
90
80
70
105C / Vmode = 0V
60
-40C / Vmode = 3V
60
25C / Vmode = 3V
105C / Vmode = 3V
50
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
50
2.2 2.4 2.6
0
0.2 0.4 0.6 0.8
1
VCTRL (V)
130
80
120
70
110
60
100
90
-40C / Vmode = 0V
40
-40C / Vmode = 0V
25C / Vmode = 0V
105C / Vmode = 0V
105C / Vmode = 0V
-40C / Vmode = 3V
20
25C / Vmode = 3V
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
105C / Vmode = 3V
10
2.2 2.4 2.6
0
VCTRL (V)
Voltage Variable RF Attenuator
-40C / Vmode = 3V
25C / Vmode = 3V
105C / Vmode = 3V
60
2.2 2.4 2.6
50
30
25C / Vmode = 0V
70
2
3rd Harm Input Intercept Point vs. VCTRL
IH3 (dBm)
IH2 (dBm)
2nd Harm Input Intercept Point vs. VCTRL
80
1.2 1.4 1.6 1.8
VCTRL (V)
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
2.2 2.4 2.6
VCTRL (V)
12
REV 2, May 2015
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
TYPICAL OPERATING CONDITIONS 2GHZ, VDD=3.3V [IP3, IP2, IH2, IH3 VS. VCTRL, RF1/RF2 DRIVEN] (-8-)
Input IP3 vs. VCTRL
Output IP3 vs. VCTRL
80
75
75
70
70
Output IP3 (dBm)
Input IP3 (dBm)
65
60
55
50
-40C / RF1 Driven
45
25C / RF1 Driven
105C / RF1 Driven
40
35
0
0.2 0.4 0.6 0.8
1
105C / RF1 Driven
60
-40C / RF2 Driven
55
25C / RF2 Driven
45
40
35
30
25
-40C / RF2 Driven
20
25C / RF2 Driven
15
2
105C / RF2 Driven
10
0
2.2 2.4 2.6
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
2.2 2.4 2.6
VCTRL (V)
VCTRL (V)
Input IP2 vs. VCTRL
Output IP2 vs. VCTRL
120
120
110
110
100
100
Output IP2 (dBm)
Input IP2 (dBm)
1.2 1.4 1.6 1.8
25C / RF1 Driven
65
50
105C / RF2 Driven
30
-40C / RF1 Driven
90
80
-40C / RF1 Driven
70
25C / RF1 Driven
-40C / RF1 Driven
25C / RF1 Driven
105C / RF1 Driven
-40C / RF2 Driven
25C / RF2 Driven
105C / RF2 Driven
90
80
70
105C / RF1 Driven
60
60
-40C / RF2 Driven
25C / RF2 Driven
105C / RF2 Driven
50
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
50
0
2.2 2.4 2.6
80
120
70
110
60
IH3 (dBm)
IH2 (dBm)
130
100
90
-40C / RF1 Driven
1.2 1.4 1.6 1.8
40
-40C / RF1 Driven
25C / RF1 Driven
20
-40C / RF2 Driven
-40C / RF2 Driven
25C / RF2 Driven
25C / RF2 Driven
105C / RF2 Driven
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
105C / RF2 Driven
10
0
2.2 2.4 2.6
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
2.2 2.4 2.6
VCTRL (V)
VCTRL (V)
Voltage Variable RF Attenuator
2.2 2.4 2.6
105C / RF1 Driven
105C / RF1 Driven
60
2
50
30
25C / RF1 Driven
70
1
3rd Harm Input Intercept Point vs. VCTRL
2nd Harm Input Intercept Point vs. VCTRL
80
0.2 0.4 0.6 0.8
VCTRL (V)
VCTRL (V)
13
REV 2, May 2015
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
TYPICAL OPERATING CONDITIONS 2GHZ, VDD=3.3V [IP3, IP2, IH2, IH3 VS. ATTENUATION] (-9-)
Input IP3 vs. Attenuation
Output IP3 vs. Attenuation
80
75
65
Output IP3 (dBm)
Input IP3 (dBm)
70
60
55
50
45
-40C
40
25C
35
125C
30
0
4
8
12
16
20
24
28
32
75
70
65
60
55
50
45
40
35
30
25
20
15
10
-40C
25C
105C
36
0
4
8
Attenuation (dB)
12
16
20
24
28
32
36
Attenuation (dB)
Input IP2 vs. Attenuation
Output IP2 vs. Attenuation
120
120
110
110
100
100
-40C
25C
Output IP2 (dBm)
Input IP2 (dBm)
105C
90
80
70
90
80
70
-40C
60
60
25C
105C
50
0
4
8
12
16
20
24
28
32
50
36
0
4
8
Attenuation (dB)
120
70
110
60
IH3 (dBm)
IH2 (dBm)
80
100
90
80
70
20
24
36
28
32
50
40
-40C
25C
10
0
36
4
8
12
16
20
24
28
Attenuation (dB)
Attenuation (dB)
Voltage Variable RF Attenuator
32
105C
105C
60
16
28
20
25C
12
24
30
-40C
8
20
3rd Harm Input Intercept Point vs. Attenuation
130
4
16
Attenuation (dB)
2nd Harm Input Intercept Point vs. Attenuation
0
12
14
REV 2, May 2015
32
36
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
TYPICAL OPERATING CONDITIONS 2GHZ, VDD=3.3V [IP3, IP2, IH2, IH3 VS. ATTEN, RF1/RF2 DRIVEN] (-10-)
Input IP3 vs. Attenuation
Output IP3 vs. Attenuation
80
75
75
70
65
70
60
65
Output IP3 (dBm)
Input IP3 (dBm)
-40C / RF1 Driven
25C / RF1 Driven
105C / RF1 Driven
-40C / RF2 Driven
25C / RF2 Driven
105C / RF2 Driven
60
55
50
45
-40C / RF1 Driven
25C / RF1 Driven
105C / RF1 Driven
-40C / RF2 Driven
25C / RF2 Driven
105C / RF2 Driven
40
35
30
0
4
8
12
16
20
24
28
32
55
50
45
40
35
30
25
20
15
10
36
0
4
8
Attenuation (dB)
12
16
20
24
28
32
36
Attenuation (dB)
Output IP2 vs. Attenuation
Input IP2 vs. Attenuation
120
120
110
110
100
100
-40C / RF1 Driven
25C / RF2 Driven
105C / RF1 Driven
Output IP2 (dBm)
Input IP2 (dBm)
-40C / RF2 Driven
90
80
-40C / RF1 Driven
70
25C / RF1 Driven
25C / RF2 Driven
105C / RF2 Driven
90
80
70
105C / RF1 Driven
60
-40C / RF2 Driven
60
25C / RF2 Driven
105C / RF2 Driven
50
0
4
8
12
16
20
24
28
32
50
0
36
4
8
130
80
120
70
110
60
IH3 (dBm)
IH2 (dBm)
16
20
24
100
90
-40C / RF1 Driven
-40C / RF1 Driven
25C / RF1 Driven
105C / RF1 Driven
20
-40C / RF2 Driven
-40C / RF2 Driven
25C / RF2 Driven
25C / RF2 Driven
105C / RF2 Driven
0
4
8
12
16
20
24
28
32
105C / RF2 Driven
10
36
0
Attenuation (dB)
Voltage Variable RF Attenuator
36
40
105C / RF1 Driven
60
32
50
30
25C / RF1 Driven
70
28
3rd Harm Input Intercept Point vs. Attenuation
2nd Harm Input Intercept Point vs. Attenuation
80
12
Attenuation (dB)
Attenuation (dB)
4
8
12
16
20
24
28
32
Attenuation (dB)
15
REV 2, May 2015
36
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
PACKAGE DRAWING (3X3 16 PIN)
Voltage Variable RF Attenuator
16
REV 2, May 2015
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
GND
VMODE
VDD
VCTRL
GND
PINOUT & BLOCK DIAGRAM
16
15
14
13
1
12
GND
Control
NC
2
11
NC
RF1
3
10
RF2
NC
4
9
NC
Voltage Variable RF Attenuator
17
GND
7
8
GND
6
GND
5
GND
E.P.
REV 2, May 2015
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
PIN DESCRIPTION
Pin
Name
1, 5, 6, 7, 8,
12, 13
GND
2, 4, 9, 11
NC
3
RF1
10
RF2
14
VCTRL
15
VDD
16
VMODE
— EP
Voltage Variable RF Attenuator
Function
Ground these pins as close to the device as possible.
No internal connection. These pins can be left unconnected or
connected to ground (recommended).
RF Port 1. Matched to 50 ohms. Must use an external AC
coupling capacitor as close to the device as possible. For low
frequency operation increase the capacitor value to result in a
low reactance at the frequency of interest.
RF Port 2. Matched to 50 ohms. Must use an external AC
coupling capacitor as close to the device as possible. For low
frequency operation increase the capacitor value to result in a
low reactance at the frequency of interest.
Attenuator control voltage. Apply a voltage in the range from 0V
to 2.8VDC. See application section for details about VCTRL.
Power supply input. Bypass to GND with capacitors close as
possible to pin.
Attenuator slope control. Set to logic LOW to enable negative
attenuation slope. Set to logic HIGH to enable positive
attenuation slope.
Exposed Pad. Internally connected to GND. Solder this exposed
pad to a PCB pad that uses multiple ground vias to achieve the
specified RF performance.
18
REV 2, May 2015
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
APPLICATIONS INFORMATION
Default Start-up
VMODE must be tied to either GND or Logic HIGH. If VCTRL pin is left floating, the part will power up in the
minimum attenuation state with a positive or negative slope dependent upon the VMODE Logic state.
VCTRL
The VCTRl pin is used to control the attenuation of the F2250. With VMODE set to a logic low (high) this places
the device in a negative (positive) slope mode where increasing (decreasing) voltage from 0V (2.8V) to 2.8V
(0V) produces an increasing (a decreasing) attenuation from insertion loss (max attenuation) to max
attenuation (insertion loss) respectively. The VCTRl pin has an on-chip pullup ESD diode so VDD should be
applied before VCTRl is applied. If this sequencing is not possible, then resistor R2 should be set for 1kΩ to
limit the current into the VCTRl for the case where VDD is not present.
VMODE
The VMODE pin is used to set the attenuation vs. VCTRl slope. With VMODE set to logic low (high) this will set the
attenuation slope to be negative (positive). A negative (positive) slope is defined as increased (decreased)
attenuation with increasing (decreasing) VCTRl voltage. The EVKIT provides and on-board jumper to manually
set the VMODE. Installing a jumper on header J2 from VMODE to GND (VHI) to set the device for a negative
(positive) slope.
RF1 and RF2 Ports
The F2250 is a bi-directional device thus allowing RF1 or RF2 to be used as the RF input. As displayed in the
Typical Operating Conditions curves, RF1 shows some enhanced linearity performance and therefore should
be used as the RF input, if possible, for best results. This F2250 has been designed to accept high RF input
power levels, therefore VDD must be applied prior to the application of RF power to ensure reliability. DC
blocking capacitors are required on the RF pins and should be set to a value that results in a low reactance
over the frequency range of interest.
Power Supplies
The supply pin should be bypassed with external capacitors to minimize noise and fast transients. Supply noise
can degrade noise figure and fast transients can trigger ESD clamps and cause them to fail. Supply voltage
change or transients should have a slew rate smaller than 1V/20uS. In addition, all control pins should remain
at 0V (+/-0.3V) while the supply voltage ramps or while it returns to zero.
Voltage Variable RF Attenuator
19
REV 2, May 2015
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
Control Pin Interface
If control signal integrity is a concern and clean signals cannot be guaranteed due to overshoot, undershoot,
ringing, etc., the following circuit at the input of control pins 14 and 16 is recommended as shown below.
VMODE
5Kohm
5Kohm
VCTRL
2pf
VDD
2pf
16
15
14
13
12
1
Control
RF1
2
11
3
10
4
9
5
Voltage Variable RF Attenuator
6
20
7
RF2
8
REV 2, May 2015
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
EVKIT/ APPLICATIONS CIRCUIT
Voltage Variable RF Attenuator
21
REV 2, May 2015
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
EVKIT PICTURE / LAYOUT (TOP SIDE)
Short GND pin to VMODE pin to set
for negative attenuation slope. For
positive attenuation slope move
shorting shunt from VMODE to VHI
VDD
RF2
RF1
VCTRL
Voltage Variable RF Attenuator
22
REV 2, May 2015
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
EVKIT PICTURE / LAYOUT (BOTTOM SIDE)
VDD
RF2
RF1
VCTRL
Voltage Variable RF Attenuator
23
REV 2, May 2015
IDTF2250NLGK
Datasheet
Voltage Variable RF Attenuator
50MHz to 6000MHz
EVKIT BOM
TOP MARKINGS
Lot Code
04Y
446L
F2250
Assembler
Code
Date Code [YWW]
(Week 46 of 2014)
Part Number
Voltage Variable RF Attenuator
24
REV 2, May 2015