IDTF2258NLGK Datasheet Voltage Variable RF Attenuator 50 to 6000 MHz GENERAL DESCRIPTION FEATURES The F2258 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 50 MHz to 6000 MHz. In addition to providing low insertion loss, the F2258 provides excellent linearity performance over its entire voltage control and attenuation range. The F2258 uses a single positive supply voltage of 3.15 V to 5.25 V. Another feature includes multidirectional operation meaning the RF input can be applied to either RF1 or RF2 pins. Control voltage ranges from 0 V to 3.6 V. COMPETITIVE ADVANTAGE FUNCTIONAL BLOCK DIAGRAM F2258 provides extremely low insertion loss and superb IP3, IP2, Return Loss and Slope Linearity across the control range. Comparing to the previous state-of-the-art for silicon VVAs this device is better as follows: Insertion Loss: @ 2000 MHz: 1.4 dB vs. 2.8 dB @ 6000 MHz: 2.7 dB vs. 7.0 dB Maximum Attenuation Slope: 33 dB/Volt vs. 53 dB/Volt Minimum Return Loss up to 6000 MHz: 12.5 dB vs. 7 dB Minimum Output IP3: 31 dBm vs. 15 dBm Minimum Input IP2: 87 dBm vs. 80 dBm Maximum Operating Temperature: +105 °C vs. +85 °C Control VDD VCTRL ORDERING INFORMATION Omit IDT prefix 0.9 mm height package Tape & Reel IDTF2258NLGK8 RF Product Line Base Station 2G, 3G, 4G, Portable Wireless Repeaters and E911 systems Digital Pre-Distortion Point to Point Infrastructure Public Safety Infrastructure Satellite Receivers and Modems WIMAX Receivers and Transmitters Military Systems, JTRS radios RFID handheld and portable readers Cable Infrastructure Wireless LAN Test / ATE Equipment F2258, Rev O 08/04/2015 RF1 RF2 APPLICATIONS Low Insertion Loss: 1.4 dB @ 2000 MHz Typical / Min IIP3: 65 dBm / 47 dBm Typical / Min IIP2: 95 dBm / 87 dBm 33.6 dB Attenuation Range Bi-directional RF ports +34.4 dBm Input P1dB compression Linear-in-dB attenuation characteristic Supply voltage: 3.15 V to 5.25 V VCTRL range: 0 V to 3.6 V using 5 V supply +105 °C max operating temperature 3 mm x 3 mm, 16-pin QFN package 1 Green © 2015 Integrated Device Technology, Inc. F2258 ABSOLUTE MAXIMUM RATINGS Parameter Symbol Min Max Units VDD -0.3 +5.5 V VCTRL -0.3 Minimum (VDD, +4.0) V VRF -0.3 0.3 V PMAX24 30 dBm Junction Temperature Tj 150 °C Storage Temperature Range Tst 150 °C 260 °C VDD to GND VCTRL to GND (with 0 V ≤ VDD ≤ 5.25 V) RF1, RF2 to GND RF1 or RF2 Input Power applied for 24 hours maximum (VDD applied @ 2000 MHz and Tcase=+85°C) -65 Lead Temperature (soldering, 10s) ElectroStatic Discharge – HBM (JEDEC/ESDA JS-001-2012) VESDHBM (Class 1C) ElectroStatic Discharge – CDM (JEDEC 22-C101F) VESDCDM (Class C3) 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) 80.6 °C/W θJC (Junction – Case) [The Case is defined as the exposed paddle] Moisture Sensitivity Rating (Per J-STD-020) Voltage Variable RF Attenuator 5.1 °C/W MSL1 2 Rev O 08/04/2015 F2258 F2258 RECOMMENDED OPERATING CONDITIONS Parameter Symbol Supply Voltage VDD Control Voltage VCTRL Operating Temperature Range TCASE Frequency Range RF Operating Power Conditions CW Typ 3.15 Max Units 5.25 V VDD = 3.90 V to 5.25 V 0 3.6 VDD = 3.15 V to 3.90 V 0 VDD-0.3 -40 +105 °C 50 6000 MHz See Figure 1 dBm Exposed Paddle FRF PMAX, Min Power can be applied to RF1 or RF2 V RF1 Port Impedance ZRF1 Single Ended 50 Ω RF2 Port Impedance ZRF2 Single Ended 50 Ω Figure 1 - MAXIMUM RF INPUT POWER VS. RF FREQUENCY Rev O 08/04/2015 3 Voltage Variable RF Attenuator F2258 F2258 SPECIFICATION Refer to EVKit / Applications Circuit, VDD = +3.3 V, TCASE = +25 °C, signal applied to RF1 input, FRF = 2000 MHz, minimum attenuation, PIN = 0 dBm for small signal parameters, +20 dBm for single tone linearity tests, +20 dBm per tone for two tone tests, two tone delta frequency = 50 MHz, PCB board traces and connector losses are de-embedded unless otherwise noted. Refer to Typical Operating Curves for performance over entire frequency band. Parameter Symbol Supply Current IDD Control Current ICTRL Insertion Loss, IL AMIN Maximum Attenuation Conditions Min 1 0.90 -1.0 Minimum Attenuation 34 35 At 18 dB attenuation relative to Insertion Loss 10 34.4 S11 S22 4 16 700 MHz 17 2000 MHz 17 6000 MHz 15 4 16 700 MHz 15 2000 MHz 16 6000 MHz 13 65 IIP3MIN All attenuation settings OIP3MIN Maximum attenuation 35 PIN + IM2dBc, IM2 term is F1+F2 95 All attenuation settings 87 IIP2 IIP2MIN μA dB dB Deg IIP3 Input IP2 mA ΦΔMID 50 MHz Output IP3 1.40 10 1.9 27 50 MHz Input IP3 1.17 At 36 dB attenuation relative to Insertion Loss Input 1dB Compression3 Minimum RF2 Return Loss over control voltage range Units ΦΔMAX Insertion Phase Δ Minimum RF1 Return Loss over control voltage range Max 1.4 2 AMAX Typ 44 55 dBm dB dB dBm dBm dBm Input IH2 HD2 PIN + H2dBc 90 dBm Input IH3 HD3 PIN + (H3dBc/2) 54 dBm Any 1 dB step in the 0 dB to 33 dB control range 50% VCTRL to RF settled to within ± 0.1 dB 15 µs Settling Time Note 1: Note 2: Note 3: Note 4: TSETTL0.1dB Items in min/max columns in bold italics are Guaranteed by Test. Items in min/max columns that are not bold/italics are Guaranteed by Design Characterization. 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 Set blocking capacitors C1 & C2 to 0.01uF to achieve best return loss performance at 50 MHz. Voltage Variable RF Attenuator 4 Rev O 08/04/2015 F2258 TYPICAL OPERATING CONDITIONS (TOC) Unless otherwise noted for the TOC graphs on the following pages, the following conditions apply. VDD = +3.3 V or +5.0 V TCASE = +25 ºC FRF = 2000 MHz RF trace and connector losses are de-embedded for S-parameters Pin = 0 dBm for all small signal tests Pin = +20 dBm for single tone linearity tests (RF1 port driven) Pin = +20 dBm/tone for two tone linearity tests (RF1 port driven) Two tone frequency spacing = 50 MHz Rev O 08/04/2015 5 Voltage Variable RF Attenuator F2258 TYPICAL OPERATING CONDITIONS [BROADBAND PERFORMANCE] (- 1 -) Attenuation vs. VCTRL Attenuation vs. Frequency 0 0.7GHz -5 1.5GHz -10 Attenuation (dB) 2.7GHz -10 Attenuation (dB) 0 0.4GHz 4.0GHz 5.0GHz -15 -20 6.0GHz -20 -30 -25 -30 -40 -35 -50 -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 0 2.6 Vctrl = 0.0V Vctrl = 0.8V Vctrl = 1.0V Vctrl = 1.2V Vctrl = 1.4V Vctrl = 1.6V Vctrl = 1.8V Vctrl = 2.4V 1 2 3 4 5 6 7 8 9 Frequency (GHz) VCTRL (V) Min. & Max. Attenuation vs. Frequency Attenuation Delta to 25C vs. Frequency 3.00 Attenuation Delta to 25C (dB) 2.50 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 -3.00 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 VCTRL (V) Voltage Variable RF Attenuator 6 Rev O 08/04/2015 2.6 F2258 TYPICAL OPERATING CONDITIONS (- 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 0.6 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 0.8 1.0 1.2 0 1.8 2.0 0 0.4GHz 0.7GHz -5 2.2 1.5GHz 2.7GHz -10 4.0GHz 5.0GHz -15 0.4GHz 0.7GHz -5 RF2 Return Loss (dB) RF1 Return Loss (dB) 1.6 RF2 Return Loss vs. VCTRL RF1 Return Loss vs. VCTRL 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 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 0.0 2.6 0.2 0.4 0.6 0.8 1.0 0.4GHz 2.0 2.2 2.4 2.6 0.4GHz Insertion Phase Slope (deg/V) 0.7GHz 2.7GHz 4.0GHz 5.0GHz 40 1.8 100 1.5GHz 50 1.6 (positive phase = electrically shorter) 0.7GHz 60 1.4 Insertion Phase Slope vs. VCTRL Insertion Phase vs. VCTRL 70 1.2 VCTRL (V) VCTRL (V) Insertion Phase (deg) 1.4 VCTRL (V) VCTRL (V) 6.0GHz 30 20 10 0 1.5GHz 80 2.7GHz 4.0GHz 60 5.0GHz 6.0GHz 40 20 0 -20 -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 0.6 2.6 Rev O 08/04/2015 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 VCTRL (V) VCTRL (V) 7 Voltage Variable RF Attenuator F2258 TYPICAL OPERATING CONDITIONS (- 3 -) Attenuation Response vs. VCTRL Attenuation Slope vs. VCTRL 0 25C / 0.9GHz -5 Attenuation Slope (dB/V) -40C / 2.0GHz 25C / 2.0GHz 105C / 2.0GHz -15 -40C / 3.0GHz 25C / 3.0GHz -20 -40C / 0.9GHz 25C / 0.9GHz 45 105C / 0.9GHz -10 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) RF1 Return Loss vs. VCTRL 0 -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 -5 -15 -20 -25 -30 -35 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 -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 vs. VCTRL 50 -40C / 0.9GHz Insertion Phase Slope vs. VCTRL 70 (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 RF2 Return Loss (dB) RF1 Return Loss (dB) -5 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 60 -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 50 40 30 20 10 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 VCTRL (V) Voltage Variable RF Attenuator 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 VCTRL (V) 8 Rev O 08/04/2015 F2258 TYPICAL OPERATING CONDITIONS (- 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 RF2 Return Loss vs. Attenuation 20 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) 16 RF2 Return Loss vs. Attenuation 0 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 0.7GHz 45 (positive phase = electrically shorter) 1.5GHz Insertion Phase (deg) 2.7GHz 4.0GHz 50 5.0GHz 6.0GHz 40 20 24 28 32 36 50 0.4GHz 60 16 Insertion Phase Δ vs. Attenuation Insertion Phase Δ vs. Attenuation 70 12 Attenuation (dB) Attenuation (dB) Insertion Phase (deg) 12 Attenuation (dB) Attenuation (dB) 30 20 10 0 40 -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 (positive phase = electrically shorter) 30 25 20 15 10 5 0 -10 0 4 8 12 16 20 24 28 32 0 36 Rev O 08/04/2015 4 8 12 16 20 24 28 32 36 Attenuation (dB) Attenuation (dB) 9 Voltage Variable RF Attenuator F2258 TYPICAL OPERATING CONDITIONS (- 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 -40C / Vctrl = 3V 25C / Vctrl = 3V 1 2 3 -37 105C / Vctrl = 0V 105C / Vctrl = 3V 4 5 50 Min./Max. Atenuation Slope (dB/V) 0 Max. Attenuation (dB) Insertion Loss (dB) Min & Max. Attenuation vs. Frequency Max. Slope 45 Min. Slope 40 35 30 VCTRL varied from 0.8V to 1.8V 25 20 15 10 -39 0 6 1 2 5 0 0 6 -40C -40C Worst-Case RF2 Return Loss (dB) Worst-Case RF1 Return Loss (dB) 4 Worst-Case RF2 Return Loss vs. Frequency Worst-Case RF1 Return Loss vs. Frequency 25C 105C -5 -10 -15 -20 25C 105C -5 -10 -15 -20 -25 -25 0 1 2 3 4 5 6 1 2 3 4 5 Gain Compression vs. Frequency Max. Insertion Phase vs. Frequency 70 0 Frequency (GHz) Frequency (GHz) Max. Insertion Phase (deg) 3 Frequency (GHz) Frequency (GHz) -40C 25C 60 105C 50 40 30 20 10 (positive phase = electrically shorter) 0 -10 0 1 2 3 4 5 6 Frequency (GHz) Voltage Variable RF Attenuator 10 Rev O 08/04/2015 6 F2258 TYPICAL OPERATING CONDITIONS (- 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 0 -10 105C / Vctrl = 0V 105C / Vctrl = 3V -1 -40C / 43MHz 25C / 43MHz -5 -14 105C / 43MHz -40C / 128MHz -18 -3 -22 (C1, C2 set to 0.1uF) 25C / 128MHz Attenuation (dB) -2 Max. Attenuation (dB) Insertion Loss (dB) -10 105C / 128MHz -15 -40C / 255MHz -20 25C / 255MHz 105C / 255MHz -4 -26 -5 -30 -6 -34 -35 -7 -38 -40 -25 -30 (C1, C2 set to 0.1uF) 0 100 200 300 Frequency (MHz) 400 0 500 0.6 0.8 1 1.4 1.6 1.8 2 2.2 2.4 2.6 2.4 2.6 0 -40C / 43MHz 25C / 43MHz 105C / 43MHz -40C / 128MHz 25C / 128MHz 105C / 128MHz -40C / 255MHz 25C / 255MHz 105C / 255MHz -5 -40C / 43MHz 25C / 43MHz 105C / 43MHz -40C / 128MHz 25C / 128MHz 105C / 128MHz -40C / 255MHz 25C / 255MHz 105C / 255MHz -10 RF2 Return Loss (dB) -10 -15 -20 -25 -30 -15 -20 -25 -30 -35 -35 (C1, C2 set to 0.1uF) (C1, C2 set to 0.1uF) -40 -40 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 0 2.6 0.2 0.4 0.6 0.8 100 0 1.4 1.6 1.8 2 2.2 -40C / Insertion Loss -40C /RF1 25C / RF1 105C / RF1 -40C / RF2 -5 1.2 Group Delay vs. VCTRL Worst-Case Return Loss vs. Low Frequency (C1, C2 set to 0.1uF) 1 VCTRL (V) VCTRL (V) 25C / RF2 Group Delay (ps) Worst-Case Return Loss (dB) 1.2 Low-Frequency RF2 Return Loss vs. VCTRL 0 RF1 Return Loss (dB) 0.4 VCTRL (V) Low-Frequency RF1 Return Loss vs. VCTRL -5 0.2 105C / RF2 -10 -15 90 25C / Insertion Loss 80 -40C / Max. Attenuation 105C / Insertion Loss 25C / Max. Attenuation 70 105C / Max. Attenuation 60 50 40 30 20 10 -20 0 100 200 300 400 0 500 0 Frequency (MHz) 1 2 3 4 5 6 Frequency (GHz) Rev O 08/04/2015 11 Voltage Variable RF Attenuator F2258 TYPICAL OPERATING CONDITIONS (- 7 -) Input IP3 vs. VCTRL Output IP3 vs. VCTRL 80 75 75 70 65 60 65 60 55 50 -40C 45 40 55 Output IP3 (dBm) Input IP3 (dBm) 70 50 45 40 35 30 35 20 25C 15 105C 105C 10 30 0 0.2 0.4 0.6 0.8 1 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 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 VCTRL (V) VCTRL (V) Output IP2 vs. VCTRL Input IP2 vs. VCTRL 120 120 110 110 100 100 -40C Output IP2 (dBm) Input IP2 (dBm) -40C 25 25C 90 80 -40C 70 25C 60 25C 105C 90 80 70 60 105C 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) 80 120 70 110 60 100 90 80 70 1.2 1.4 1.6 1.8 2 25C 20 -40C 25C 105C 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 40 30 105C 1 2.2 2.4 2.6 50 -40C 60 0.2 0.4 0.6 0.8 2 3rd Harm Input Intercept Point vs. VCTRL 130 IH3 (dBm) IH2 (dBm) 2nd Harm Input Intercept Point vs. VCTRL 0 1.2 1.4 1.6 1.8 VCTRL (V) 12 Rev O 08/04/2015 F2258 TYPICAL OPERATING CONDITIONS (- 8 -) Input IP3 vs. VCTRL Output IP3 vs. VCTRL 80 75 75 70 65 Output IP3 (dBm) Input IP3 (dBm) 70 60 55 50 -40C / RF1 Driven 45 25C / RF1 Driven 105C / RF1 Driven 40 -40C / RF2 Driven 35 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 105C / RF1 Driven 60 -40C / RF2 Driven 55 25C / RF2 Driven 105C / RF2 Driven 50 45 40 35 30 25 15 105C / RF2 Driven 0 25C / RF1 Driven 65 20 25C / RF2 Driven 30 -40C / RF1 Driven 10 2.2 2.4 2.6 0 0.2 0.4 0.6 0.8 1 VCTRL (V) Input IP2 vs. VCTRL 2 2.2 2.4 2.6 Output IP2 vs. VCTRL 120 120 110 110 100 100 Output IP2 (dBm) Input IP2 (dBm) 1.2 1.4 1.6 1.8 VCTRL (V) 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 0.2 0.4 0.6 0.8 1 80 120 70 110 60 IH3 (dBm) IH2 (dBm) 130 100 90 -40C / RF1 Driven 40 -40C / RF1 Driven 25C / RF1 Driven 105C / RF1 Driven 105C / RF1 Driven 20 -40C / RF2 Driven -40C / RF2 Driven 25C / RF2 Driven 25C / RF2 Driven 105C / RF2 Driven 60 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) Rev O 08/04/2015 2.2 2.4 2.6 50 30 25C / RF1 Driven 70 2 3rd Harm Input Intercept Point vs. VCTRL 2nd Harm Input Intercept Point vs. VCTRL 80 1.2 1.4 1.6 1.8 VCTRL (V) VCTRL (V) 13 Voltage Variable RF Attenuator F2258 TYPICAL OPERATING CONDITIONS (- 9 -) Input IP3 vs. Attenuation Output IP3 vs. Attenuation 80 75 75 70 65 60 65 Output IP3 (dBm) Input IP3 (dBm) 70 60 55 50 45 -40C 40 8 12 16 20 24 28 45 40 35 30 -40C 25 20 25C 105C 15 105C 30 4 50 25C 35 0 55 32 10 36 0 4 8 12 Attenuation (dB) 16 20 24 28 32 36 Attenuation (dB) Input IP2 vs. Attenuation Output IP2 vs. Attenuation 120 120 110 100 100 Output IP2 (dBm) Input IP2 (dBm) -40C 110 90 80 -40C 70 25C 60 25C 105C 90 80 70 60 105C 50 50 0 4 8 12 16 20 24 28 32 0 36 4 8 16 20 24 28 32 36 3rd Harm Input Intercept Point vs. Attenuation 2nd Harm Input Intercept Point vs. Attenuation 130 80 120 70 110 60 IH3 (dBm) IH2 (dBm) 12 Attenuation (dB) Attenuation (dB) 100 90 -40C 80 40 -40C 30 25C 70 50 25C 20 105C 105C 60 10 0 4 8 12 16 20 24 28 32 36 0 Attenuation (dB) Voltage Variable RF Attenuator 4 8 12 16 20 24 28 32 36 Attenuation (dB) 14 Rev O 08/04/2015 F2258 TYPICAL OPERATING CONDITIONS (- 10 -) Input IP3 vs. Attenuation Output IP3 vs. Attenuation 80 75 75 70 65 70 60 65 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 Output IP3 (dBm) Input IP3 (dBm) -40C / RF1 Driven 25C / RF1 Driven 105C / RF1 Driven -40C / RF2 Driven 25C / RF2 Driven 105C / RF2 Driven 50 45 40 35 30 25 20 15 10 0 36 4 8 12 16 20 24 28 32 36 Attenuation (dB) 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 -40C / RF2 Driven 60 60 25C / RF2 Driven 105C / RF2 Driven 50 0 4 8 12 16 20 24 28 32 50 36 0 Attenuation (dB) 8 12 16 20 24 28 32 36 Attenuation (dB) 2nd Harm Input Intercept Point vs. Attenuation 3rd Harm Input Intercept Point vs. Attenuation 130 80 120 70 110 60 IH3 (dBm) IH2 (dBm) 4 100 90 -40C / RF1 Driven 80 40 -40C / RF1 Driven 30 25C / RF1 Driven 25C / RF1 Driven 105C / RF1 Driven 105C / RF1 Driven 70 50 20 -40C / RF2 Driven -40C / RF2 Driven 25C / RF2 Driven 25C / RF2 Driven 60 0 4 8 12 16 20 24 28 32 0 36 4 8 12 16 20 24 28 32 36 Attenuation (dB) Attenuation (dB) Rev O 08/04/2015 105C / RF2 Driven 10 105C / RF2 Driven 15 Voltage Variable RF Attenuator F2258 PACKAGE DRAWING (3mm x 3mm 16-pin TQFN), NLG16 Voltage Variable RF Attenuator 16 Rev O 08/04/2015 F2258 LAND PATTERN DIMENSION Rev O 08/04/2015 17 Voltage Variable RF Attenuator F2258 PIN DIAGRAM PIN DESCRIPTION Pin Name 4, 9 GND Ground these pins as close to the device as possible. 3 RF2 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. 5 VDD Power supply input. Bypass to GND with capacitors close as possible to pin. 1, 2, 6, 8, 11, 12, 13, 14, 15, 16 NC No internal connection. These pins can be left unconnected or connected to ground. 7 VCTRL Attenuator control voltage. Apply a voltage in the range as specified in the Operating Conditions Table. See application section for details about V CTRL. RF1 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. 10 — EP Voltage Variable RF Attenuator Function 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 O 08/04/2015 F2258 APPLICATIONS INFORMATION Default Start-up The VCTRL pin has an internal pull-down resistor. If left floating, the part will power up in the minimum attenuation state. VCTRL The VCTRl pin is used to control the attenuation of the F2258. With VDD = 5 V the control range of VCTRl is from 0 V (minimum attenuation) to 3.6 V (maximum attenuation). For other settings of VDD refer to the Operating Conditions Table. Apply VDD before applying voltage to the VCTRl pin to prevent damage to the on-chip pull-up ESD diode. If this sequencing is not possible, then set resistor R2 to 1kΩ to limit the current into the V CTRl pin. RF1 and RF2 Ports The F2258 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 enhanced linearity. 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. 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 pin 7 is recommended as shown below. 16 RF2 15 14 13 1 12 2 11 3 10 4 9 Control 6 7 VDD 5 RF1 8 5Kohm VCTRL 2pf Rev O 08/04/2015 19 Voltage Variable RF Attenuator F2258 EVKIT PICTURE Top View Bottom View Voltage Variable RF Attenuator 20 Rev O 08/04/2015 F2258 EVKIT / APPLICATIONS CIRCUIT Rev O 08/04/2015 21 Voltage Variable RF Attenuator F2258 EVKIT BOM (REV 02) Item # Part Reference QTY DESCRIPTION Mfr. Part # Mfr. 1 C3, C6 2 10nF ±5%, 50V, X7R Ceramic Capacitor (0603) GRM188R71H103J Murata 2 C4, C5 2 1000pF ±5%, 50V, C0G Ceramic Capacitor (0402) GRM1555C1H102J Murata 3 C1, C2 2 100pF ±5%, 50V, C0G Ceramic Capacitor (0402) GRM1555C1H101J Murata 4 R1, R2 2 0Ω Resistors (0402) ERJ-2GE0R00X Panasonic 5 J1, J2, J3, J4 4 Edge Launch SMA (0.375 inch pitch ground tabs) 142-0701-851 Emerson Johnson 6 U1 1 Voltage Variable Attenuator F2258NLGK IDT 1 Printed Circuit Board F2258 EVKIT REV 02 IDT 7 TOP MARKINGS Lot Code 04Y 446L F2258 Assembler Code Date Code [YWW] (Week 46 of 2014) Part Number Voltage Variable RF Attenuator 22 Rev O 08/04/2015 F2258 REVISION HISTORY SHEET Rev Date O 2015-Aug-03 Rev O 08/04/2015 Page Description of Change Initial Release 23 Voltage Variable RF Attenuator F2258 Corporate Headquarters 6024 Silver Creek Valley Road San Jose, CA 95138 USA Sales 1-800-345-7015 or 408-284-8200 Fax: 408-284-2775 www.idt.com Tech Support http://www.idt.com/support/technical-support DISCLAIMER Integrated Device Technology, Inc. (IDT) reserves the right to modify the products and/or specifications described herein at any time, without notice, at IDT’s sole discretion. Performance specifications and operating parameters of the described products are determined in an independent state and are not guaranteed to perform the same way when installed in customer products. The information contained herein is provided without representation or warranty of any kind, whether express or implied, including, but not limited to, the suitability of IDT’s products for any particular purpose, an implied warranty of merchantability, or non-infringement of the intellectual property rights of others. This document is presented only as a guide and does not convey any license under intellectual property rights of IDT or any third parties. IDT’s products are not intended for use in applications involving extreme environmental conditions or in life support systems or similar devices where the failure or malfunction of an IDT product can be reasonably expected to significantly affect the health or safety of users. Anyone using an IDT product in such a manner does so at their own risk, absent an express, written agreement by IDT. Integrated Device Technology, IDT and the IDT logo are trademarks or registered trademarks of IDT and its subsidiaries in the United States and other countries. Other trademarks used herein are the property of IDT or their respective third party owners. Copyright ©2015. Integrated Device Technology, Inc. All rights reserved. Voltage Variable RF Attenuator 24 Rev O 08/04/2015