Datasheet LTC6910-1, LTC6910-2, LTC6910-3 (Linear Technology)

LTC6910-1/ LTC6910-2/LTC6910-3 Digitally Controlled Programmable Gain Amplifiers in SOT-23
FeaTures DescripTion
n
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 n
Rail-to-Rail Input Range
occupy very little PC board space. The inverting gain is n
Rail-to-Rail Output Swing
adjustable using a 3-bit digital input to select gains of 0, n
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, n 11MHz Gain Bandwidth Product 4, 8, 16, 32 and 64V/V in the LTC6910-2; and 0, 1, 2, 3, n Input Noise Down to 8nV/√Hz 4, 5,6 and 7V/V in the LTC6910-3. n System Dynamic Range to 120dB The LTC6910-Xs are inverting amplifiers with rail-to-rail n Input Offset Voltage: 1.5mV output. When operated with unity gain, they will also n 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
applicaTions
offered in an 8-lead SOT-23 package. n Data Acquisition Systems L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Dynamic Gain Changing ThinSOT is a trademark of Analog Devices, Inc. All other trademarks are the property of their respective owners. Protected by U.S. patents, including 6121908. n Automatic Ranging Circuits n Automatic Gain Control
Typical applicaTion Single Supply Programmable Amplifier Frequency Response (LTC6910-1)
V+ 50 V 2.7V TO 10.5V S = 10V, VIN = 5mVRMS 0.1µF GAIN OF 100 (DIGITAL INPUT 111) 40
DIGITAL INPUTS GAIN IN VOLTS/VOLT G2 G1 G0 6910-1 6910-2 6910-3
0 0 0 0 0 0 8 30 GAIN OF 50 (DIGITAL INPUT 110) 4 0 0 1 –1 –1 –1 0 1 0 –2 –2 –2 3 1 GAIN OF 20 (DIGITAL INPUT 101) VIN LTC6910-X VOUT = GAIN • VIN 20 0 1 1 –5 –4 –3 GAIN OF 10 (DIGITAL INPUT 100) 2 1 0 0 –10 –8 –4 GAIN (dB) 5 1 0 1 –20 –16 –5 AGND GAIN OF 5 (DIGITAL INPUT 011) 6 10 1 1 0 –50 –32 –6 7 1µF OR LARGER 1 1 1 –100 –64 –7 GAIN OF 2 (DIGITAL INPUT 010) 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 For more information www.linear.com/LTC6910 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Gain Settings and Properties Electrical Characteristics Typical Performance Characteristics Pin Functions Applications Information Package Description Revision History Typical Application Related Parts