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AD7656ABSTZ Scheda tecnica(PDF) 8 Page - Analog Devices

Il numero della parte AD7656ABSTZ
Spiegazioni elettronici  250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 16-Bit ADC
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

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Data Sheet
AD7656A
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
64 63 62
61
60 59 58
57 56 55 54 53 52 51 50 49
47
AVCC
46
AVCC
45
V5
42
V4
43
AGND
44
AGND
48
V6
41
AVCC
40
AVCC
39
V3
37
AGND
36
V2
35
AVCC
34
AVCC
33
V1
38
AGND
2
DB13
3
DB12
4
DB11
7
DB8/DOUT A
6
DB9/DOUT B
5
DB10/DOUT C
1
DB14/REFBUFEN/DIS
8
DGND
9
VDRIVE
10
DB7/HBEN/DCEN
12
DB5/DCIN A
13
DB4/DCIN B
14
DB3/DCIN C
15
DB2/SEL C
16
DB1/SEL B
11
DB6/SCLK
17 18
19
20
21 22 23
24 25 26
27 28 29 30 31 32
PIN 1
AD7656A
TOP VIEW
(Not to Scale)
Figure 3. Pin Configuration
Table 5. Pin Function Descriptions1
Pin No.
Mnemonic
Description
1
DB14/REFBUFEN/DIS
Data Bit 14/Reference Buffer Enable and Disable. When SER/PAR/SEL = 0, this pin acts as a three-
state digital input/output pin.
2, 3, 64
DB13, DB12, DB15
Data Bit 13, Data Bit 12, and Data Bit 15. When SER/PAR/SEL = 0, these pins act as three-state parallel
digital input/output pins. When CS and RD are low, these pins are used to output the conversion
result. When CS and WR are low, these pins are used to write to the control register. When SER/PAR/SEL =
1, tie these pins to DGND.
4
DB11
Data Bit 11/Digital Ground. When SER/PAR/SEL = 0, this pin acts as a three-state parallel digital
output pin. When SER/PAR/SEL = 1, tie this pin to DGND.
5
DB10/DOUT C
Data Bit 10/Serial Data Output C. When SER/PAR/SEL = 0, this pin acts as a three-state parallel digital
output pin. When SER/PAR/SEL = 1 and SEL C = 1, this pin takes on its DOUT C function and outputs
serial conversion data. this pin configures the serial interface to have three DOUT x output lines.
6
DB9/DOUT B
Data Bit 9/Serial Data Output B. When SER/PAR/SEL = 0, Pin 6 acts as a three-state parallel digital
output pin. When SER/PAR/SEL = 1 and SEL B = 1, Pin 6 takes on its DOUT B function and outputs
serial conversion data. this pin configures the serial interface to have two DOUT x output lines.
7
DB8/DOUT A
Data Bit 8/Serial Data Output A. When SER/PAR/SEL = 0, this pin acts as a three-state parallel digital
output pin. When SER/PAR/SEL = 1 and SEL A = 1, this pin takes on its DOUT A function and outputs
serial conversion data.
8, 25
DGND
Digital Ground. These pins are the ground reference point for all digital circuitry on the AD7656A.
Connect both DGND pins to the DGND plane of a system. Ideally, the DGND and AGND voltages are at
the same potential and must not be more than 0.3 V apart, even on a transient basis.
9
VDRIVE
Logic Power Supply Input. The voltage supplied at this pin determines the operating voltage of the
interface. Nominally, it is at the same supply as the supply of the host interface. Decouple this pin to
DGND, and place 10 µF and 100 nF decoupling capacitors on the VDRIVE pin.
Rev. 0 | Page 7 of 28


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