Datasheet AD8331, AD8332, AD8334 (Analog Devices) - 5

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Data Sheet AD8331/AD8332/AD8334 Parameter Test Conditions/Comments Min Typ Max Unit1
Differential 4.5 V p-p Output Offset Voltage AD8331 Differential, VGAIN = 0.5 V −50 ±5 +50 mV Common mode −125 −25 +100 mV AD8332, AD8334 Differential, 0.05 V ≤ VGAIN ≤ 1.0 V −20 ±5 +20 mV Common mode −125 –25 +100 mV Output Short-Circuit Current 45 mA Harmonic Distortion VGAIN = 0.5 V, VOUT = 1 V p-p, HI gain AD8331 HD2 f = 1 MHz −88 dBc HD3 −85 dBc HD2 f = 10 MHz −68 dBc HD3 −65 dBc AD8332, AD8334 HD2 f = 1 MHz −82 dBc HD3 −85 dBc HD2 f = 10 MHz −62 dBc HD3 −66 dBc Input 1 dB Compression Point VGAIN = 0.25 V, VOUT = 1 V p-p, f = 1 MHz to 10 MHz 1 dBm Two-Tone Intermodulation Distortion (IMD3) AD8331 VGAIN = 0.72 V, VOUT = 1 V p-p, f = 1 MHz −80 dBc VGAIN = 0.5 V, VOUT = 1 V p-p, f = 10 MHz −72 dBc AD8332, AD8334 VGAIN = 0.72 V, VOUT = 1 V p-p, f = 1 MHz −78 dBc VGAIN = 0.5 V, VOUT = 1 V p-p, f = 10 MHz −74 dBc Output Third-Order Intercept AD8331 VGAIN = 0.5 V, VOUT = 1 V p-p, f = 1 MHz 38 dBm VGAIN = 0.5 V, VOUT = 1 V p-p, f = 10 MHz 33 dBm AD8332, AD8334 VGAIN = 0.5 V, VOUT = 1 V p-p, f = 1 MHz 35 dBm VGAIN = 0.5 V, VOUT = 1 V p-p, f = 10 MHz 32 dBm Channel-to-Channel Crosstalk (AD8332, VGAIN = 0.5 V, VOUT = 1 V p-p, f = 1 MHz −98 dB AD8334) Overload Recovery VGAIN = 1.0 V, VIN = 50 mV p-p/1 V p-p, f = 10 MHz 5 ns Group Delay Variation 5 MHz < f < 50 MHz, full gain range ±2 ns ACCURACY Absolute Gain Error2 0.05 V < VGAIN < 0.10 V −1 +0.5 +2 dB 0.10 V < VGAIN < 0.95 V −1 ±0.3 +1 dB 0.95 V < VGAIN < 1.0 V −2 −1 +1 dB Gain Law Conformance3 0.1 V < VGAIN < 0.95 V ±0.2 dB Channel-to-Channel Gain Matching 0.1 V < VGAIN < 0.95 V ±0.1 dB GAIN CONTROL INTERFACE (Pin GAIN) Gain Scaling Factor 0.10 V < VGAIN < 0.95 V 48.5 50 51.5 dB/V Gain Range LO gain −4.5 to +43.5 dB HI gain 7.5 to 55.5 dB Input Voltage (VGAIN) Range 0 to 1.0 V Input Impedance 10 MΩ Response Time 48 dB gain change to 90% full scale 500 ns COMMON-MODE INTERFACE (PIN VCMx) Input Resistance4 Current limited to ±1 mA 30 Ω Output CM Offset Voltage VCM = 2.5 V −125 −25 +100 mV Voltage Range VOUT = 2.0 V p-p 1.5 to 3.5 V Rev. I | Page 5 of 55 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUITS MEASUREMENT CONSIDERATIONS THEORY OF OPERATION OVERVIEW LOW NOISE AMPLIFIER (LNA) Active Impedance Matching LNA Noise VARIABLE GAIN AMPLIFIER X-AMP VGA Gain Control VGA Noise Common-Mode Biasing POSTAMPLIFIER Noise Output Clamping APPLICATIONS INFORMATION LNA—EXTERNAL COMPONENTS Gain Input VCM Input Logic Inputs—ENB, MODE, and HILO Optional Output Voltage Limiting Output Decoupling DRIVING ADCs OVERLOAD OPTIONAL INPUT OVERLOAD PROTECTION LAYOUT, GROUNDING, AND BYPASSING MULTIPLE INPUT MATCHING DISABLING THE LNA ULTRASOUND TGC APPLICATION HIGH DENSITY QUAD LAYOUT AD8331 EVALUATION BOARD GENERAL DESCRIPTION USER-SUPPLIED OPTIONAL COMPONENTS MEASUREMENT SETUP BOARD LAYOUT AD8331 EVALUATION BOARD SCHEMATICS AD8331 EVALUATION BOARD PCB LAYERS AD8332 EVALUATION BOARD GENERAL DESCRIPTION USER-SUPPLIED OPTIONAL COMPONENTS MEASUREMENT SETUP BOARD LAYOUT EVALUATION BOARD SCHEMATICS AD8332 EVALUATION BOARD PCB LAYERS AD8334 EVALUATION BOARD GENERAL DESCRIPTION CONFIGURING THE INPUT IMPEDANCE Driving the VGA from an External Source or Using the LNA to Drive an External Load Using the Clamp Circuit Viewing Signals MEASUREMENT SETUP BOARD LAYOUT EVALUATION BOARD SCHEMATICS AD8334 EVALUATION BOARD PCB LAYERS OUTLINE DIMENSIONS ORDERING GUIDE