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AD8251 데이터시트(HTML) 21 Page - Analog Devices

부품명 AD8251
상세내용  10 MHz, 20 V/μs, G = 1, 2, 4, 8 i CMOS® Programmable Gain Instrumentation Amplifier
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제조사  AD [Analog Devices]
홈페이지  http://www.analog.com
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AD8251 데이터시트(HTML) 21 Page - Analog Devices

 
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AD8251
Rev. 0 | Page 21 of 24
APPLICATIONS
DIFFERENTIAL OUTPUT
In certain applications, it is necessary to create a differential
signal. High resolution analog-to-digital converters often
require a differential input. In other cases, transmission over
a long distance can require differential signals for better
immunity to interference.
Figure 59 shows how to configure the AD8251 to output a
differential signal. An op amp, the AD817, is used in an
inverting topology to create a differential voltage. VREF sets the
output midpoint according to the equation shown in the figure.
Errors from the op amp are common to both outputs and are
thus common mode. Likewise, errors from using mismatched
resistors cause a common-mode dc offset error. Such errors are
rejected in differential signal processing by differential input
ADCs or instrumentation amplifiers.
When using this circuit to drive a differential ADC, VREF can be
set using a resistor divider from the ADC reference to make the
output ratiometric with the ADC.
SETTING GAINS WITH A MICROCONTROLLER
+15V
MICRO-
CONTROLLER
–15V
A0
A1
WR
+IN
–IN
10μF0.1µF
10μF0.1µF
REF
AD8251
+
DGND
DGND
Figure 58. Programming Gain Using a Microcontroller
+12V
–12V
A0
A1
WR
+IN
10μF
0.1μF
10μF
0.1μF
AD8251
REF
G = 1
0.1µF
4.99kΩ
4.99kΩ
AD817
0.1µF
+12V
–12V
VREF
0V
VOUTA = VIN + VREF
2
2
VOUTB = –VIN + VREF
+2.5V
–2.5V
0V
+2.5V
–2.5V
0V
TIME
AMPLITUDE
0V
TIME
AMPLITUDE
+5V
–5V
AMPLITUDE
10pF
+12V
–12V
VIN
+
+
DGND
DGND
Figure 59. Differential Output with Level Shift


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