AD676 Analog Devices, AD676 Datasheet - Page 6

• Manufacturer Part Number: AD676
• Description: 16-Bit Parallel 100 kSPS Sampling ADC
• Manufacturer: Analog Devices

Specifications of AD676

• Resolution (bits): 16bit
• # Chan: 1
• Sample Rate: 100kSPS
• Interface: Par
• Analog Input Type: SE-Bip
• Ain Range: Bip (Vref)
• Adc Architecture: SAR
• Pkg Type: DIP

AD676
Pin
1–6
7
8
9
10
11
12
13
14
15
16
17
18
19–28
Type: AI = Analog Input
DI = Digital Input
DO = Digital Output
P = Power
Name
BIT 11-BIT 16
BUSY
CAL
SAMPLE
CLK
DGND
V
AGND
AGND SENSE
V
V
V
V
BIT 1–BIT 10
AGND SENSE
CC
IN
REF
EE
DD
BIT 16 (LSB)
SAMPLE
BIT 14
BIT 15
BIT 12
BIT 13
BIT 11
DGND
AGND
BUSY
CAL
CLK
V
CC
12
13
10
11
14
1
2
4
5
7
8
3
6
9
Package Pinout
(Not to Scale)
TOP VIEW
Type
DO
DO
DI
DI
DI
P
P
P/AI
AI
AI
AI
P
P
DO
AD676
Description
BIT 11–BIT 16 represent the six LSBs of data.
Status Line for Converter. Active HIGH, indicating a conversion or calibration in progress.
BUSY should be buffered when capacitively loaded.
Calibration Control Pin (Asynchronous).
V
of the internal sample-hold amplifier and the falling edge initiates conversion (see “Conver-
sion Control” paragraph). During calibration, SAMPLE should be held LOW. If HIGH dur-
ing calibration, diagnostic information will appear on the two LSBs (Pins 5 and 6).
Master Clock Input. The AD676 requires 17 clock cycles to execute a conversion.
Digital Ground.
+12 V Analog Supply Voltage.
Analog Ground.
Analog Ground Sense.
Analog Input Voltage.
External Voltage Reference Input.
–12 V Analog Supply Voltage. Note: the lid of the ceramic package is internally connected to
V
+5 V Logic Supply Voltage.
BIT 1–BIT 10 represent the ten MSB of data.
IN
EE
19
28
27
26
25
24
23
22
20
18
17
16
15
21
.
Acquisition Control Pin. Active HIGH. During conversion, SAMPLE controls the state
BIT 10
BIT 9
BIT 8
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1 (MSB)
V
V
V
BIT 7
V
DD
EE
REF
IN
PIN DESCRIPTION
–6–
AGND SENSE
SAMPLE
AGND
V
CAL
CLK 10
REF
V
IN
15
14
16
16
13
8
9
DIGITAL
CHIP
Functional Block Diagram
BUFFERS
MICRO-CODED
CONTROLLER
INPUT
LEVEL TRANSLATORS
LOGIC & TIMING
CAL
DAC
16-BIT
DAC
RAM
GEN
SAR
PAT
ALU
COMP
ANALOG
AD676
CHIP
A
C
H
L
T
19
28
1
6
7
BUSY
BIT 1 – BIT 16
REV. A