Datasheet Analog Devices AD8338ACPZ-R7

FEATURES FUNCTIONAL BLOCK DIAGRAM
VBAT OFSN VREF OFFSET NULL AD8338 VGA CORE
INPR + INMR – OUTP +
OUTPUT
STAGE
0dB
– OUTM 0dB TO 80dB
VREF INPD Front end for inductive telemetry systems
Ultrasonic signal receivers
Signal compression for driving an ADC
AGC amplifiers COMM MODE GAIN FBKM AUTOMATIC
GAIN
CONTROL GAIN INTERFACE INMD APPLICATIONS
DETO VAGC Figure 1.
100 GENERAL DESCRIPTION 80 The basic gain function is linear-in-dB and is controlled by the
voltage applied to Pin GAIN. The nominal gain range spans
from 0 dB to 80 dB for control voltages between 0.1 V to 1.1 V
with a slope of 12.5 mV/dB. The nominal gain range can be
shifted up or down via direct access to Pin INPD and Pin INMD,
the current inputs of the VGA. For example, driving the INPD
and INMD pins with 50 Ω resistors shifts the gain range up by
20 dB, that is, 20 dB to 100 dB, and lowers the input referred
noise of the device to 1.5 nV/√Hz. Additionally, the gain slope …