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AD8253ARMZ Scheda tecnica(PDF) 21 Page - Analog Devices

Il numero della parte AD8253ARMZ
Spiegazioni elettronici  10 MHz, 20 V/關s, G = 1, 10, 100, 1000 iCMOS Programmable Gain Instrumentation Amplifier
PDF  24 Pages
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD8253ARMZ Scheda tecnica(HTML) 21 Page - Analog Devices

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AD8253
Rev. 0 | Page 21 of 24
APPLICATIONS INFORMATION
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 61 shows how to configure the AD8253 to output a
differential signal. An op amp, the AD8675, 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
AD8253
+
–
DGND
DGND
Figure 60. Programming Gain Using a Microcontroller
+15V
–15V
A0
A1
WR
+IN
10μF
0.1μF
10μF
0.1μF
AD8253
REF
G = 1
0.1µF
4.99kΩ
4.99kΩ
AD8675
0.1µF
+15V
–15V
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
56pF
+15V
–15V
VIN
+
–
+
–
DGND
DGND
Figure 61. Differential Output with Level Shift



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