Datasheet Analog Devices AD8370 — 数据表

LF to 750 MHz,
Digitally Controlled VGA
AD8370 Data Sheet
FEATURES FUNCTIONAL BLOCK DIAGRAM PWUP 4 ICOM 2 INHI 1 GENERAL DESCRIPTION
The AD8370 is a low cost, digitally controlled, variable gain
amplifier (VGA) that provides precision gain control, high IP3,
and low noise figure. The excellent distortion performance and
wide bandwidth make the AD8370 a suitable gain control
device for modern receiver designs.
For wide input, dynamic range applications, the AD8370 provides
two input ranges: high gain mode and low gain mode. A vernier,
7-bit, transconductance (gm) stage provides 28 dB of gain range
at better than 2 dB resolution and 22 dB of gain range at better than
1 dB resolution. A second gain range, 17 dB higher than the first,
can be selected to provide improved noise performance.
The AD8370 is powered on by applying the appropriate logic
level to the PWUP pin. When powered down, the AD8370
consumes less than 4 mA and offers excellent input to output
isolation. The gain setting is preserved when operating in a
power-down mode. VCCO VCCO 3 11 6 BIAS CELL PRE
AMP TRANSCONDUCTANCE 5 VOCM 7 OCOM 8 OPHI 9 OPLO OUTPUT
AMP INLO 16 10 OCOM ICOM 15
SHIFT REGISTER …