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AD871 Datenblatt(PDF) 5 Page - Analog Devices

Teilenummer AD871
Bauteilbeschribung  Complete 12-Bit 5 MSPS Monolithic A/D Converter
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
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AD871 Datenblatt(HTML) 5 Page - Analog Devices

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AD871
REV. A
–5–
PIN FUNCTION DESCRIPTIONS
DIP
LCC
Symbol
Pin No.
Pin No.
Type
Name and Function
VINA
1
1
AI
(+) Analog Input Signal on the differential input amplifier.
VINB
2
2
AI
(–) Analog Input Signal on the differential input amplifier.
AVSS
3, 25
5, 40
P
–5 V Analog Supply.
AVDD
4
6, 38
P
+5 V Analog Supply.
AGND
5, 24
9, 36
P
Analog Ground.
DGND
6, 23
10
P
Digital Ground.
DVDD
7, 22
33
P
+5 V Digital Supply.
BIT 12 (LSB)
8
16
DO
Least Significant Bit.
BIT 2–BIT 11
18–9
26–17
DO
Data Bits 2 through 11.
MSB
19
29
DO
Inverted Most Significant Bit. Provides twos complement output
data format.
OTR
20
30
DO
Out of Range is Active HIGH on the leading edge of code 0 or
the trailing edge of code 4096. See Output Data Format Table III.
CLK
21
31
DI
Clock Input. The AD871 will initiate a conversion on the rising
edge of the clock input. See the Timing Diagram for details.
REF OUT
26
41
AO
+2.5 V Reference Output. Tie to REF IN for normal operation.
REF GND
27
42
AI
Reference Ground.
REF IN
28
43
AI
Reference Input. +2.5 V input gives
±1 V full-scale range.
BIT 1 (MSB)
N/A
27
DO
Most Significant Bit.
DRVDD
N/A
12, 32
P
+5 V Digital Supply for the output drivers.
DRGND
N/A
11, 34
P
Digital Ground for the output drivers.
(See section on Power Supply Decoupling for details on
DRVDD and DRGND.)
OEN
N/A
13
DI
Output Enable. See the Three State Output Timing Diagram for details.
NC
N/A
3, 4, 7, 8, 14, 15,
No Connect.
28, 35, 37, 39, 44
TYPE: AI = Analog Input; AO = Analog Output; DI = Digital Input; DO = Digital Output; P = Power; N/A = Not Available on 28-lead DIP, available only on
44-terminal surface mount package.
PIN CONFIGURATIONS
28-Lead Side Brazed Ceramic DIP
TOP VIEW
(Not to Scale)
AD871
BIT 11
BIT 12 (LSB)
VINA
VINB
AVSS
AVDD
DVDD
DGND
AGND
OTR
CLK
REF IN
REF GND
REF OUT
AVSS
DVDD
AGND
MSB
BIT 10
BIT 9
BIT 8
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
DGND
44-Terminal LCC
39
38
37
36
35
34
33
32
31
30
29
18 19 20 21 22 23 24 25 26 27 28
7
8
9
10
11
12
13
14
15
16
17
6
5
4
3
2
1
44 43 42 41 40
PIN 1
IDENTIFIER
TOP VIEW
(Not to Scale)
NC = NO CONNECT
NC
AVDD
NC
AGND
NC
DRGND
DVDD
DRVDD
CLK
OTR
MSB
NC
NC
AGND
DGND
DRGND
DRVDD
OEN
NC
NC
BIT 12 (LSB)
BIT 11
AD871


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