AD8338

Data Sheet Low Power, 18 MHz Variable Gain Amplifier AD8338 FEATURES Voltage controlled gain range of 0 dB to 80 dB 3 mA supply current at gain of 40 dB Low frequency (LF) to 18 MHz operation Supply range: 3.0 V to 5.0 V Low noise: 4.5 nV/√Hz at 80 dB gain Fully differential signal path Offset correction (offset null) feature Internal 1.5 V reference 16-lead LFCSP Automatic gain control feature Wide gain range for high dynamic range signals APPLICATIONS Front end for inductive telemetry systems Ultrasonic signal receivers Signal compression for driving an ADC AGC amplifiers INPR INMR INPD INMD FUNCTIONAL BLOCK DIAGRAM VBAT OFSN VREF OFFSET NULL VGA CORE + – 0dB TO 80dB GAIN INTERFACE AD8338 + OUTPUT STAGE 0dB – VREF AUTOMATIC GAIN CONTROL FBKP OUTP OUTM FBKM COMM MODE GAIN DETO Figure 1. VAGC 11279-001 GENERAL DESCRIPTION The AD8338 is a variable gain amplifier (VGA) for applications that require a fully differential signal path, low power, low noise, and a well-defin...