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AD8295BCPZ-R7 Datasheet(PDF) 25 Page - Analog Devices

No. de pieza AD8295BCPZ-R7
Descripción Electrónicos  Precision Instrumentation Amplifier with Signal Processing Amplifiers
PDF  28 Pages
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD8295BCPZ-R7 Datasheet(HTML) 25 Page - Analog Devices

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AD8295
Rev. 0 | Page 25 of 2
8
DRIVING DIFFERENTIAL ADCs
Figure 65 shows how to configure the AD8295 to drive a differ-
ential ADC. The circuit shown uses very little board space and
consumes little power. With the AD7690, this configuration
gives excellent dc performance and a THD of 83 dB (10 kHz
input). For applications that need better distortion performance,
a dedicated ADC driver, such as the ADA4941-1 or ADA4922-1
is recommended.
The 500 Ω resistors and the 2.2 nF capacitors form a low-pass,
antialiasing filter at 144 kHz. The four elements of the filter also
prevent the switching transients produced by a typical SAR
converter from destabilizing the AD8295. The capacitors provide
charge to the switched capacitor front end of the ADC, and the
resistors shield the AD8295 from driving any sharp current
changes. If the application requires a lower frequency anti-
aliasing filter than the one shown, increasing the capacitor
values produces much better distortion results than increasing
the resistor values.
The 500 Ω resistors also give the ADC protection against over-
voltage. Because the AD8295 runs on wider supply voltages
than a typical ADC, there is a possibility of overdriving some
converters. This is not an issue with a PulSAR® ADC, such as
the AD7690, because its input can handle a 130 mA overdrive,
which is much higher than the short-circuit limit of the AD8295.
However, other converters have less robust inputs and may
benefit from the resistive protection.
A1
OUT
A1
R2
A2
+IN
A2
–IN
–IN
–INPUT
+INPUT
RG
+VS
+7V
0.1µF
–VS
–7V
OUT
REF
RG
+IN
IN– GND
REF
VDD
IN+
1
2
3
4
8
7
6
5
13
14
15
16
A1
IA
A2
R1
20kΩ
R2
20kΩ
A2
OUT
+5V
+
AD8295
ADR435
AD7690
A1
+IN
10µF
+2.5V
+OUT
500Ω
10kΩ
10kΩ
500Ω
2.2nF
2.2nF
–OUT
A1
R1
A1
–IN
12
11
10
9
0.1µF
+5V
0.1µF
0.1µF
+5V
+7V
0.1µF
Figure 65. Driving a Differential ADC



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