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LTC6910-1
LTC6910-2/LTC6910-3
1
6910123fa
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
3-Bit Digital Gain Control in Three Gain-Code
Options
■
Rail-to-Rail Input Range
■
Rail-to-Rail Output Swing
■
Single or Dual Supply: 2.7V to 10.5V Total
■
11MHz Gain Bandwidth Product
■
Input Noise Down to 8nV/√Hz
■
System Dynamic Range to 120dB
■
Input Offset Voltage: 1.5mV
■
8-Pin Low Profile (1mm) SOT-23
(ThinSOT™) Package
Digitally Controlled
Programmable
Gain Amplifiers in SOT-23
■
Data Acquisition Systems
■
Dynamic Gain Changing
■
Automatic Ranging Circuits
■
Automatic Gain Control
The LTC
®
6910 family are low noise digitally program-
mable gain amplifiers (PGAs) that are easy to use and
occupy very little PC board space. The inverting gain is
adjustable using a 3-bit digital input to select gains of 0, 1,
2, 5, 10, 20, 50 and 100V/V in the LTC6910-1; 0, 1, 2, 4,
8, 16, 32 and 64V/V in the LTC6910-2; and 0, 1, 2, 3, 4, 5,6
and 7V/V in the LTC6910-3.
The LTC6910-Xs are inverting amplifiers with rail-to-rail
output. 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 LTC6910-X family is
offered in an 8-lead SOT-23 package.
Single Supply Programmable Amplifier Frequency Response (LTC6910-1)
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
13
V
IN
V
OUT
= GAIN • V
IN
AGND
1µF OR LARGER
PIN 2 (AGND) PROVIDES BUILT-IN HALF-SUPPLY
REFERENCE WITH INTERNAL RESISTANCE OF 5k.
AGND CAN ALSO BE DRIVEN BY A SYSTEM ANALOG
GROUND REFERENCE NEAR HALF SUPPLY
6910 TA01
5
4
LTC6910-X
6
8
V
+
2.7V TO 10.5V
0.1µF
G2 G1 G0
7
6910-1
0
–1
–2
–5
–10
–20
–50
–100
6910-2
0
–1
–2
–4
–8
–16
–32
–64
GAIN IN VOLTS/VOLT
6910-3
0
–1
–2
–3
–4
–5
–6
–7
DIGITAL INPUTS
G2
0
0
0
0
1
1
1
1
G1
0
0
1
1
0
0
1
1
G0
0
1
0
1
0
1
0
1
FREQUENCY (Hz)
10
GAIN (dB)
30
50
0
20
40
100 10k 100k 1M 10M
6910 TA01b
–10
1k
GAIN OF 100 (DIGITAL INPUT 111)
GAIN OF 1 (DIGITAL INPUT 001)
GAIN OF 2 (DIGITAL INPUT 010)
GAIN OF 5 (DIGITAL INPUT 011)
GAIN OF 10 (DIGITAL INPUT 100)
GAIN OF 20 (DIGITAL INPUT 101)
GAIN OF 50 (DIGITAL INPUT 110)
V
S
= 10V, V
IN
= 5mV
RMS
ThinSOT is a trademark of Linear Technology Corporation.
U.S. Patent Number 6121908.
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