AD679 Analog Devices, AD679 Datasheet - Page 6

• Manufacturer Part Number: AD679
• Description: 14-Bit 128 kSPS Complete Sampling ADC
• Manufacturer: Analog Devices

AD679
Symbol
AGND
AIN
BIPOFF
CS
DGND
DB7–DB0
EOC
EOCEN
HBE
OE
REF
REF
SC
SYNC
V
V
V
—
—
Type: AI = Analog Input. AO = Analog Output. DI = Digital Input (TTL and 5 V CMOS compatible). DO = Digital Output (TTL and 5 V CMOS compatible).
All DO pins are three-state drivers. P = Power. U = Unused.
CC
EE
DD
IN
OUT
28-Pin
DIP
Pin No.
7
6
10
4
12, 14
26–19
27
1
15
2
9
8
3
13
11
5
28
16
17–18
DIP Package
40, 39, 37, 36,
44-Lead
JLCC
Pin No.
11
10
15
6
23
35, 34, 33, 31
42
1
25
3
14
12
5
21
17
8
43
2, 4, 7, 9, 13,
16, 18, 19, 20,
22, 24, 26, 27,
28, 29, 30, 32,
38, 41, 44
Type
P
AI
AI
DI
P
DO
DO
DI
DI
DI
AI
AO
DI
DI
P
P
P
U
U
Bipolar Offset. Connect to AGND for +10 V input unipolar mode and straight
Data Bits. These pins provide all 14 bits in two bytes (8+6 bits). Active HIGH.
Name and Function
Analog Ground. This is the ground return for AIN only.
Analog Signal Input.
binary output coding. Connect to REF
twos complement binary output coding.
Chip Select. Active LOW.
Digital Ground.
End-of-Convert. EOC goes LOW when a conversion starts and goes HIGH
when the conversion finishes. In asynchronous mode, EOC is an open drain
output and requires an external 3 k pull-up resistor. See EOCEN and SYNC
pins for information on EOC gating.
End-of-Convert Enable. Enables EOC pin. Active LOW.
High Byte Enable. If LOW, output contains high byte. If HIGH, output
contains low byte (corresponding to the most recently read high byte).
Output Enable. A down-going transition on OE enables DB7–DB0. Gated with
CS. Active LOW.
Reference Input. +5 V input gives 10 V full-scale range.
+5 V Reference Output. Tied to REF
Start Convert. Active LOW. See SYNC pin for gating.
SYNC Control. If tied to V
by CS. If tied to DGND (asynchronous mode), SC and EOCEN are indepen-
dent of CS, and EOC is an open drain output. EOC requires an external 3 k
pull-up resistor in asynchronous mode.
+12 V Analog Power.
–12 V Analog Power.
+5 V Digital Power.
Tie to DGND.
These pins are unused and should be connected to DGND or V
PIN CONFIGURATION
PIN DESCRIPTION
–6–
DD
(synchronous mode), SC and EOCEN are gated
IN
OUT
for normal operation.
JLCC Package
for 5 V input bipolar mode and
DD
.
REV. C