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AD7264BCPZ Datasheet(PDF) 20 Page - Analog Devices

Part No. AD7264BCPZ
Description  1 MSPS, 14-Bit, Simultaneous Sampling SAR ADC
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7264BCPZ Datasheet(HTML) 20 Page - Analog Devices

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Data Sheet
AD7264
Rev. D | Page 19 of 29
10µF1
100nF
VDRIVE
VDRIVE
VDRIVE
3V OR 5V
SUPPLY
MICROPROCESSOR/
MICROCONTROLLER
10µF1
COMPARATOR
SUPPLY 3V TO 5V2
BOTH
COMPARATORS
AND ADCs
POWERED ON
100nF
100nF
100nF
ANALOG
SUPPLY
+5V
10µF1
100nF
100nF
100nF
100nF
100nF
VDRIVE
G0
G1
G2
G3
SCLK
DOUTA
DOUTB
REFSEL
CAL
PD0/DIN
PD1
PD2
13 14 15 16
45 46 47 48
25 26 29 30
22
23
36
24
32
35
34
37
38
39
40
27
31
21
1µF
1µF
17 44
5
6
8 19 42 28 2
7 11 20 41 12
1 33
VB–
VB+
VREFB
VREFA
VA+
VA–
10
9
18
43
4
3
AD7264
VDRIVE
VDRIVE
FAST PROPAGATION DELAY
COMPARATOR INPUTS
1THESE CAPACITORS ARE PLACED AT THE SUPPLY SOURCE AND MAY NOT BE REQUIRED IN ALL SYSTEMS.
2THIS SUPPLY CAN BE CONNECTED TO THE ANALOG 5V SUPPLY IF REQUIRED.
LOW POWER
COMPARATOR INPUTS
SERIAL
INTERFACE
GAIN 2
SETUP
VA– AND VA+
CONNECT
DIRECTLY
TO SENSOR
OUTPUTS
THIS REFERENCE SIGNAL
MUST BE BUFFERED
BEFORE IT CAN BE
USED ELSEWHERE IN
THE CIRCUIT
GAIN 2
GAIN 2
GAIN 2
GAIN 2
VB– AND VB+
CONNECT
DIRECTLY
TO SENSOR
OUTPUTS
CS
3.125V
2.500V
1.875V
3.125V
2.500V
1.875V
3.125V
2.500V
1.875V
3.125V
2.500V
1.875V
Figure 27. Typical Connection Diagram for the AD7264 in Pin Driven Mode with Gain of 2 and Both ADCs and Comparators Fully Powered On
Comparator Application Details
The comparators on the AD7264 have been designed with no
internal hysteresis, allowing users the flexibility to add external
hysteretic if required for systems operating in noisy environments.
If the comparators on the AD7264 are used with external hyste-
resis, some external resistors and capacitors are required, as shown
in Figure 28. The value of RF and RS, the external resistors, can be
determined using the following equation, depending on the
amount of hysteresis required in the application:
CC
X
F
S
S
HYS
V
C
C
R
R
R
V
_
X
×
+
=
where CX_CXVCC = CA_CBVCC or CC_CDVCC.
The amount of hysteresis chosen must be sufficient to eliminate
the effects of analog noise at the comparator inputs, which may
affect the stability of the comparator outputs. The level of
hysteresis required in any system depends on the noise in the
system; thus, the value of RF and RS needs to be carefully selected
to eliminate any noise effects. To increase the level of hysteresis in
the system, increase the value of RSor RF. For example, RF = 10 MΩ,
RS = 1 kΩ gives 330 μV of hysteresis with a Cx_CxVCC of 3.3 V; if
hysteresis is increased to 1 mV, RS = 3.1 kΩ. In certain applications,
a load capacitor (100 pF) may be required on the comparator
outputs to suppress high frequency transient glitches.


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