LTC6910-1/
LTC6910-2/LTC6910-3
Digitally Controlled
Programmable
Gain Amplifiers in SOT-23
Fea T Descrip T
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3-Bit Digital Gain Control in Three Gain-Code The LTC 6910 family are low noise digitally program-
Options mable gain amplifiers (PGAs) that are easy to use and
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Rail-to-Rail Input Range occupy very little PC board space. The inverting gain is
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Rail-to-Rail Output Swing adjustable using a 3-bit digital input to select gains of 0,
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Single or Dual Supply: 2.7V to 10.5V Total 1, 2, 5, 10, 20, 50 and 100V/V in the LTC6910-1; 0, 1, 2,
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11MHz Gain Bandwidth Product 4, 8, 16, 32 and 64V/V in the LTC6910-2; and 0, 1, 2, 3,
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Input Noise Down to 8nV/Hz 4, 5,6 and 7V/V in the LTC6910-3.
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System Dynamic Range to 120dB
The LTC6910-Xs are inverting amplifiers with rail-to-rail
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Input Offset Voltage: 1.5mV
output. When operated with unity gain, they will also
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8-Pin Low Profile (1mm) SOT-23
process rail-to-rail input signals. A half-supply refer-
(ThinSOT) Package
ence 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
a T
offered in an 8-lead SOT-23 package.
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Data Acquisition Systems
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
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ThinSOT is a trademark of Analog Devices, Inc. All other trademarks are the property of their
Dynamic Gain Changing
respective owners. Protected by U.S. patents, including 6121908.
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Automatic Ranging Circuits
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Automatic Gain Control
Typical a T
Single Supply Programmable Amplifier Frequency Response (LTC6910-1)
+ 50
V
V = 10V, V = 5mV
S IN RMS
2.7V TO 10.5V
GAIN OF 100 (DIGITAL INPUT 111)
0.1F
40
DIGITAL INPUTS GAIN IN VOLTS/VOLT
G2 G1 G0 6910-1 6910-2 6910-3
30
8 GAIN OF 50 (DIGITAL INPUT 110)
0 0 0 0 0 0
4
0 0 1 1 1 1
GAIN OF 20 (DIGITAL INPUT 101)
0 1 0 2 2 2 3 1
20
V LTC6910-X V = GAIN V
IN OUT IN
0 1 1 5 4 3
GAIN OF 10 (DIGITAL INPUT 100)
2
1 0 0 10 8 4
5
GAIN OF 5 (DIGITAL INPUT 011)
1 0 1 20 16 5 10
AGND
6
1 1 0 50 32 6
7
1F OR LARGER
GAIN OF 2 (DIGITAL INPUT 010)
1 1 1 100 64 7
G2 G1 G0
6910 TA01
0
GAIN OF 1 (DIGITAL INPUT 001)
PIN 2 (AGND) PROVIDES BUILT-IN HALF-SUPPLY
REFERENCE WITH INTERNAL RESISTANCE OF 5k.
10
AGND CAN ALSO BE DRIVEN BY A SYSTEM ANALOG
100 1k 10k 100k 1M 10M
GROUND REFERENCE NEAR HALF SUPPLY
FREQUENCY (Hz)
6910 TA01b
6910123fb
1
For more information www.linear.com/LTC6910
GAIN (dB)
ion pplica
ions pplica
ion uresLTC6910-1/
LTC6910-2/LTC6910-3
a Te Maxi Mu M r a T p in c F T
(Note 1)
Total Supply Voltage (V+ to V) ............................... 11V
Input Current ...................................................... 25mA
TOP VIEW
+
Operating Temperature Range (Note 2)
OUT 1 8 V
AGND 2 7 G2
LTC6910-1C, -2C, -3C ..........................40C to 85C
IN 3 6 G1
LTC6910-1I, -2I, -3I ............................. 40C to 85C
V 4 5 G0
LTC6910-1H, -2H, -3H ...................... 40C to 125C
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
Specified T emperature Range (Note 3)
T = 150C, = 230C/W
JMAX JA
LTC6910-1C, -2C, -3C .......................... 40C to 85C
LTC6910-1I, -2I, -3I ............................. 40C to 85C
LTC6910-1H, -2H, -3H ...................... 40C to 125C
Storage Temperature Range ................... 65C to 150C
Lead Temperature (Soldering, 10 sec) .................. 300C
o r Der i n F Ma T