AD8352-EVAL

2 GHz Ultralow Distortion Differential RF/IF Amplifier AD8352 FEATURES −3 dB bandwidth of 2.2 GHz (AV = 10 dB) Single resistor gain adjust 3 dB ≤ AV ≤ 21 dB Single resistor and capacitor distortion adjust Input resistance 3 kΩ, independent of gain (AV) Differential or single-ended input to differential output Low noise input stage 2.7 nV/√Hz RTI @ AV = 10 dB Low broadband distortion 10 MHz: −86 dBc HD2, −82 dBc HD3 70 MHz: −84 dBc HD2, −82 dBc HD3 190 MHz: −81 dBc HD2, −87 dBc HD3 OIP3 of 41 dBm @ 150 MHz Slew rate 8 V/ns Fast settling and overdrive recovery of 2 ns Single-supply operation: 3 V to 5.0 V Low power dissipation: 37 mA @ 5 V Power down capability: 5 mA @ 5 V Fabricated using the high speed XFCB3 SiGe process FUNCTIONAL BLOCK DIAGRAM ENB RGP RDP VIP RD VIN RDN 05728-001 BIAS CELL VCM VCC + VOP RG CD – VON RGN GND AD8352 Figure 1. –60 –65 –70 –75 44 42 40 38 36 34 32 30 28 220 APPLICATIONS Differential ADC drivers Single-ended to differential conversion RF/IF gain blocks SAW filter interfacing HD3 (dBc) –80 –85 –90 –95 –100 20 40 60 80 100 120 140 160 180 200 FREQUENCY (MHz) Figure 2. IP3 and Third Harmonic Distortion vs. Frequency, Measured Differentially GENERAL DESCRIPTION The AD8352 is a high performance differential amplifier optimized for RF and IF applications. It achieves better than 80 dB SFDR performance at frequencies up to 200 MHz, and 65 dB beyond 500 MHz, making it an ideal driver for high speed 12- to 16-bit analog-to-digital converters (ADCs). Unlike other wideband differential amplifiers, the AD8352 has buffers that isolate the Gain Setting Resistor RG from the signal inputs. As a result, the AD8352 maintains a constant 3 kΩ input resistance for gains of 3 dB to 24 dB, easing matching and input drive requirements. The AD8352 has a nominal 100 Ω differential output resistance. The device is optimized for wide band, low distortion performance at frequencies beyond 500 MHz. These attributes, together with its wide gain adjust capability, make this device the amplifier of choice for general-purpose IF and broadband applications where low distortion, noise, and power are critical. In particular, it is ideally suited for driving not only ADCs, but also mixers, pin diode attenuators, SAW filters, and multielement discrete devices. The device comes in a compact 3 mm × 3 mm, 16-lead LFCSP package and operates over a temperature range of −40°C to +85°C. Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved. 05728-002 IP3 (dBm) AD8352 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Noise Distortion Specifications .................................................. 4 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configuration and Function Descriptions............................. 7 Typical Performance Characteristics ............................................. 8 Applications..................................................................................... 11 Gain and Distortion Adjustment (Differential Input) .......... 11 Single-Ended Input Operation ................................................. 12 Narrow-Band, Third-Order Intermodulation Cancellation. 13 High Performance ADC Driving ............................................. 14 Layout and Transmission Line Effects..................................... 15 Evaluation Board ............................................................................ 16 Evaluation Board Loading Schemes ........................................ 17 Evaluation Board Schematics ................................................... 18 Outline Dimensions ....................................................................... 20 Ordering Guide .......................................................................... 20 REVISION HISTORY 1/06—Revision 0: Initial Version Rev. 0| Page 2 of 20 AD8352 SPECIFICATIONS VS = 5 V, RL = 200 Ω differential, RG = 118 Ω (AV = 10 dB), f = 100 MHz, T = 25°C; parameters specified differentially (in/out), unless otherwise noted. CD and RD are selected for differential broadband operation (see Table 6 and Table 7). Table 1. Parameter DYNAMIC PERFORMANCE −3 dB Bandwidth Conditions AV = 6 dB, VOUT ≤ 1.0 V p-p AV = 10 dB, VOUT ≤ 1.0 V p-p AV = 14 dB, VOUT ≤ 1.0 V p-p 3 dB ≤ AV ≤ 20 dB, VOUT ≤ 1.0 V p-p 3 dB ≤ AV ≤ 20 dB, VOUT ≤ 1.0 V p-p Using 1% resistor for RG, 0 dB ≤ AV ≤ 20 dB VS ± 5% −40°C to +85°C RL = 1 kΩ, VOUT = 2 V step RL = 200 Ω, VOUT = 2 V step 2 V step to 1% VIN = 4 V to 0 V step, VOUT ≤ ±10 mV Min Typ 2500 2200 1800 190 300 ±1 .06 4 9 8