|
LTC6911-1 Datasheet, PDF (1/20 Pages) Linear Technology – Dual Matched Amplifiers with Digitally Programmable Gain in MSOP | |||
|
LTC6911-1/LTC6911-2
Dual Matched Amplifiers
with Digitally Programmable
Gain in MSOP
FEATURES
s 3-Bit Digital Gain Control:
(Inverting Gains of 0, 1, 2, 5, 10, 20, 50
and 100V/V) -1 Option
(Inverting Gains of 0, 1, 2, 4, 8, 16, 32
and 64V/V) -2 Option
s Two Matched Programmable Gain Amplifiers
s Channel-to-Channel Gain Matching of 0.1dB (Max)
s Rail-to-Rail Input Range
s Rail-to-Rail Output Swing
s Single or Dual Supply: 2.7V to 10.5V Total
s 11MHz Gain Bandwidth Product
s Input Noise: 10nV/âHz
s Total System Dynamic Range to 120dB
s Input Offset Voltage: 2mV, Gain of 10
s Low Profile 10-Lead MSOP Package
U
APPLICATIO S
s Data Acquisition Systems
s Dynamic Gain Changing
s Automatic Ranging Circuits
s Automatic Gain Control
DESCRIPTIO
The LTC®6911 is a family of low noise digitally program-
mable gain amplifiers (PGAs) that are easy to use and
occupy very little PC board space. The matched gain of
both channels is adjustable using a 3-bit parallel interface
to select voltage gains of 0, 1, 2, 5, 10, 20, 50 and 100V/
V (LTC6911-1) and 0, 1, 2, 4, 8, 16, 32 and 64V/V
(LTC6911-2). All gains are inverting.
The LTC6911 family consists of two matched inverting
amplifiers with rail-to-rail outputs. When operated with
unity gain, they will also process rail-to-rail input signals.
A half-supply reference generated internally at the AGND
pin supports single power supply applications. Operating
from single or split supplies from 2.7V to 10.5V, the
LTC6911 family is offered in a 10-lead MSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
V+
2.7V TO 10.5V 0.1µF
7
9
DIGITAL
INPUT
GAIN IN V/V
G2 G1 G0 LTC6911-1 LTC6911-2
000
0
0
001
â1
â1
010
â2
â2
011
â5
â4
1 0 0 â10
â8
1 0 1 â20
â16
1 1 0 â50
â32
1 1 1 â100
â64
AGND
1
VINA
â¥1µF
2
3
VINB
LTC6911-X
10 VOUTA =
GAIN ⢠VINA
8 VOUTB =
GAIN ⢠VINB
691112 TA01
4
5
6
G0 G1 G2
Frequency Response (LTC6911-1)
50
VS = 10V, VIN = 5mVRMS
GAIN OF â100 (DIGITAL INPUT 111)
40
30 GAIN OF â50 (DIGITAL INPUT 110)
GAIN OF â20 (DIGITAL INPUT 101)
20
GAIN OF â10 (DIGITAL INPUT 100)
10 GAIN OF â5 (DIGITAL INPUT 011)
GAIN OF â2 (DIGITAL INPUT 010)
0 GAIN OF â1 (DIGITAL INPUT 001)
â10
100
1k
10k 100k 1M 10M
FREQUENCY (Hz)
691112 TA02
sn691112 691112fs
1
|
▷ |