ATT530B6
Digital Attenuator MMIC
ATT530B6 : LSB 0.5dB, 0.5~3.0GHz 6 Bit Digital Attenuator
Applications
· 3G Infrastructure & access points
· Cellular/3G, LTE & UBM
· WiMAX & Fixed Wireless
· GSM, WCDMA
· Test Instrumentation
Features
· Positive voltage operation: 2.7 to 5.5 V
· LSB attenuation: 0.5 dB
· Attenuation range: 31.5dB
· Bit error: ±0.3dB Typical step error
Preliminary
· High IIP3: +45 dBm
· TTL/CMOS Compatible Control
· 16 lead QFN Package (4mm x 4mm)
Block Diagram
Overview
The ATT530B6 is a GaAs MMIC binary-weighted six bit positive control digital attenuator. The device operates from 0.5 to 3.0 GHz with a
control and supply voltage 3V. The ATT530B6 has and LSB of 0.5 dB and total attenuation of 31.5dB. An external supply voltage of 2.7 to
5.5V is required. The ATT530B6 is composed of six cascaded fixed attenuators. The state of attenuators is controlled by the logic level
voltage. The attenuator bit values are 0.5(LSB), 1, 2, 4, 8, 16dB for a total attenuation of 31.5dB. Attenuation accuracy is excellent at ±0.3
dB typical step error with an IIP3 of +45 dBm. A single positive Vdd bias of 3V is required.
Electrical Specifications
Parameters
Insertion loss
Test Conditions
Min
0.5 to 1 GHz
1 to 2 GHz
2 to 3 GHz
Attenuation range
Attenuation accuracy
Input power for 1dB compression
Max
Units
1.5
2.0
2.6
1.9
2.4
3.1
dB
31.5
dB
0.5 to 1 GHz
±(0.5+5% of attenuation setting)
1 to 2 GHz
±(0.2+3% of attenuation setting)
2 to 3 GHz
±(0.3+3% of attenuation setting)
Return loss
Switching characteristics:
Rise/fall time
On/off time
Typ
10
dB
20
dB
(10%/90% RF)
(50% Vctrl to RF)
600
660
ns
0.5 to 3 GHz
Vs = 3V
Vs = 5V
+24
+27
dBm
+45
dBm
3rd Order Input Intercept Point
Supply voltage
Vs
2.8
7
V
Control voltage
High
Low
VCtrl
VHigh
VLow
0.7
-0.2
Vs+0.2
0.2
V
V
Current
VCtrl = 0V
VCtrl = 3V
VCtrl = 5V
20
100
200
uA
uA
uA
1/5
ASB Inc.  sales@asb.co.kr  Tel: +82-42-528-7223
August 2012
ATT530B6
Digital Attenuator MMIC
Insertion Loss vs. Frequency
Normalized Attenuation
0.0
Normalized Attenuation [ dB ]
0
-0.5
Insertion Loss [ dB ]
-1.0
-1.5
-2.0
-2.5
-3.0
-3.5
-4.0
-4.5
-5.0
-5
-10
-15
0.5dB
1dB
2dB
4dB
8dB
16dB
31.5dB
-20
-25
-30
-35
0
500
1000
1500
2000
2500
3000
3500
4000
0
500
1000
Frequency [ MHz ]
1500
2000
2500
3000
Bit Error vs. Frequency
4000
Return Loss vs. Frequency
Preliminary
3.0
0
0.5dB
1dB
2dB
4dB
8dB
16dB
31.5dB
2.4
-5
1.2
0.6
0.0
0.5dB
1dB
2dB
4dB
8dB
16dB
31.5dB
-0.6
-1.2
-1.8
Return Loss [ dB ]
1.8
Bit Error [ dB ]
3500
Frequency [ MHz ]
-10
-15
-20
-25
500
1000
1500
2000
2500
Frequency [ MHz ]
2/5
3000
3500
4000
0
500
1000
1500
2000
2500
3000
3500
4000
Frequency [ MHz ]
ASB Inc.  sales@asb.co.kr  Tel: +82-42-528-7223
August 2012
ATT530B6
Digital Attenuator MMIC
Truth Table
Attenuation
state
Control Voltage Input
V1
0.5dB
V2
1dB
V3
4dB
V4
8dB
V5
16dB
V6
31.5dB
Reference I.L
High
High
High
High
High
High
0.5dB
Low
High
High
High
High
High
1dB
High
Low
High
High
High
High
2dB
High
High
Low
High
High
High
4dB
High
High
High
Low
High
High
8dB
High
High
High
High
Low
High
Preliminary
16dB
High
High
High
High
High
Low
31.5dB
High
High
High
High
High
High
Control Voltage & Current
3/5
State
Bias Condition
High
1 to +Vs
Low
0 to +0.2 V
ASB Inc.  sales@asb.co.kr  Tel: +82-42-528-7223
August 2012
ATT530B6
Digital Attenuator MMIC
Absolute Maximum Ratings
Parameters
Rating
RF Input Power (0.5 to 3 GHz)
+27 dBm
Operating Case Temperature
-40 to 85C
Storage Temperature
-65 to 150C
Device Voltage
+7 V
Operating Junction Temperature
+160C
130 C/W
Thermal Resistance
Ordering Information
Part Number
ATT530B6-EB
Description
Package Description
Component Packing
Evaluation Board
Preliminary
ATT530B6
RFIC
RoHS compliant QFN
Tape & Reel
Static Sensitivity
Gallium Arsenide Integrated Circuits are sensitive to electrostatic discharge(ESD) and can be damaged by static electricity.
Proper ESD control techniques should be used when handling these devices.
Handling Procedures
Please observe the following precautions to avoid damage
4/5
ASB Inc.  sales@asb.co.kr  Tel: +82-42-528-7223
August 2012
ATT530B6
Digital Attenuator MMIC
Application Circuit
Vdd
V1
V2 V3 V4 V5
V6
C3=1 nF
16
15
14
13
1
12
2
ATT350B6
3
RF1
C1=1 nF
11
10
4
9
5
6
7
8
C2=1 nF
RF2
Preliminary
Evaluation PCB
5/5
ASB Inc.  sales@asb.co.kr  Tel: +82-42-528-7223
August 2012