ISL28617 Datasheet, PDF (1/18 Pages) Intersil Corporation – 40V Precision Instrumentation Amplifier with Differential ADC Driver

40V Precision Instrumentation Amplifier with
Differential ADC Driver
ISL28617
The ISL28617 is a high performance, differential input, differential
output instrumentation amplifier designed for precision analog to
digital applications. It can operate over a supply range of 8V (±4V) to
40V (±20V) and features a differential input voltage range up to
±34V. The output stage has rail-to-rail output drive capability
optimized for differential ADC driver applications. Its versatility and
small package makes it suitable for a variety of general purpose
applications. Additional features not found in other instrumentation
amplifiers enable high levels of DC precision and excellent AC
performance.
The gain of the ISL28617 can be programmed from 0.1 to
10,000 via two external resistors, R_IN and R_FB. The gain accuracy
is determined by the matching of R_IN and R_FB. The gain resistors
have Kelvin sensing, which removes gain error due to PC trace
resistance. The input and output stages have individual power
supply pins, which enable input signals riding on a high common
mode voltage to be level shifted to a low voltage device, such as
an A/D converter. The rail-to-rail output stage can be powered
from the same supplies as the ADC, which preserves the ADC
maximum input dynamic range and eliminates ADC input
overdrive.
The ISL28617 is offered in the 24 Ld TSSOP package, and is
guaranteed over -40°C to +125°C operation.
Related Literature
• “ISL28617VYXXEV1Z User’s Guide” AN1753
• “ISL28617SMXXEV1Z User’s Guide” AN1748
Features
• Rail-to-rail Differential Output ADC Driver
• High Voltage Interface to Low Voltage Circuits
• Wide Operating Voltage Range . . . . . . . . . . . . . . ±4V to ±20V
• Low Input Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30μV
• Excellent CMRR and PSRR . . . . . . . . . . . . . . . . . . . . . . . 120dB
• Closed Loop -3dB BW . .0.3MHz (A_V = 1k) to 5MHz (A_V = 0.1)
• Operating Temperature Range. . . . . . . . . . .-40°C to +125°C
• Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Ld TSSOP
Applications
• Precision Test and Measurement
• High Voltage Industrial Process Control
• Signal Conditioning Amplifier for Remote Powered Sensors
• Weigh Scales
• ECG and Biomedical Sense Amplifiers
140
120
100
80
60 ^{AV = 1000}
A_V = 100
40 _{AV = 10}
20 ^{AV = 1}
A_V = 0.1
0
1
10
100
1k
10k
FREQUENCY(Hz)
100k 1M
FIGURE 1. CMRR R_F = 121k
FULL BRIDGE STRAIN GAUGE AMPLIFIER AND DIFFERENTIAL ADC DRIVER
+5V
TO
+20V
-5V
TO
-20V
BRIDGE
EXCITATION
May 25, 2012
1
FN6562.0
IN+
+R_IN ^VCC
+R_INSENSE
R_IN
V_CO
+V_FB
-R_INSENSE
-R_{IN ISL28617}
+V_OUT
+R_FB
-V_OUT
R_FB
+R_FBSENSE
--RR^FFBBSEVN_E^S_E^EGND
V_CMO^-VFB
V_EO
IN-
R
C
R
V_DD
+IN
A-D
CONVERTER
-IN
ISL26132
V_{REF GND}
+5V
V_REF
ISL21090
AV = R_FB/R_IN RANGE FROM 0.1 TO 10,000
FIGURE 2. BASIC APPLICATION CIRCUIT
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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