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LTC6910-1_15 PDF预览

LTC6910-1_15

更新时间: 2024-09-16 01:12:59
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
24页 251K
描述
Digitally Controlled Programmable Gain Amplifiers in SOT-23

LTC6910-1_15 数据手册

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LTC6910-1  
LTC6910-2/LTC6910-3  
Digitally Controlled  
Programmable  
Gain Amplifiers in SOT-23  
U
FEATURES  
DESCRIPTIO  
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.  
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  
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.  
Input Offset Voltage: 1.5mV  
8-Pin Low Profile (1mm) SOT-23  
(ThinSOT™) Package  
U
APPLICATIO S  
Data Acquisition Systems  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
ThinSOT is a trademark of Linear Technology Corporation.  
Dynamic Gain Changing  
U.S. Patent Number 6121908.  
Automatic Ranging Circuits  
Automatic Gain Control  
U
TYPICAL APPLICATIO  
Single Supply Programmable Amplifier  
Frequency Response (LTC6910-1)  
50  
+
V
V
= 10V, V = 5mV  
IN  
S
RMS  
2.7V TO 10.5V  
GAIN OF 100 (DIGITAL INPUT 111)  
0.1µF  
40  
30  
DIGITAL INPUTS GAIN IN VOLTS/VOLT  
G2 G1 G0 6910-1 6910-2 6910-3  
GAIN OF 50 (DIGITAL INPUT 110)  
8
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
0
0
4
–1  
–1  
–1  
–2  
–3  
–4  
–5  
–6  
–7  
GAIN OF 20 (DIGITAL INPUT 101)  
GAIN OF 10 (DIGITAL INPUT 100)  
GAIN OF 5 (DIGITAL INPUT 011)  
3
1
–2  
–5  
–10  
–20  
–50  
–100  
–2  
20  
10  
V
V
= GAIN • V  
LTC6910-X  
IN  
OUT IN  
–4  
2
–8  
5
–16  
–32  
–64  
AGND  
1µF OR LARGER  
6
7
GAIN OF 2 (DIGITAL INPUT 010)  
GAIN OF 1 (DIGITAL INPUT 001)  
G2 G1 G0  
6910 TA01  
0
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  
–10  
100  
1k  
10k  
100k  
1M  
10M  
FREQUENCY (Hz)  
6910 TA01b  
6910123fa  
1

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