®
®
ADC-674
12-Bit, μP-Compatible A/D Converter
PRODUCT OVERVIEW
The ADC-674 A/D converters are available in
both ceramic leadless chip carrier and industry
standard DIP packages.
These units include a reference, clock, three-
state outputs, and digital interface circuit which
allows direct connection to the microprocessor
address bus and control lines. The ADC-674 com-
pletes a 12-bit conversion in 8 microseconds.
Four user selectable input ranges are provided:
0 to +10V, 0 to +20V, +/-5V, and +/-10V dc. Laser
trimming ensures specified linearity, gain and
offset accuracy.
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
15
PIN FUNCTION
V
+5V
1
2
3
4
5
6
7
8
9
D
GND
logic,
FEATURES
12/8, DATA MODE SELECT
CS, CHIP SELECT
16 DB0 (LSB)
17 DB1
■
Complete 12-Bit A/D converters with reference
and clock
A0, BYTE ADDRESS/SHORT CYCLE
R/C, READ/CONVERT
18 DB2
■
Pin-to-pin compatible with industry standard
574A/674A Series
19 DB3
CE, CHIP ENABLE
20 DB4
■
■
■
No missing codes over temperature
8 μSec. Conversion time
V
21 DB5
cc
REFERENCE OUT
22 DB6
A
23 DB7
GND
250 mW maximum power dissipation
10 REFERENCE IN
23 DB8
11
V
*
25 DB9
ee
12 BIPOLAR OFFSET
13 10V IN
26 DB10
27 DB11 (MSB)
28 STS
14 20V IN
* For applications with no -15V supply, contact our factory.
BLOCK DIAGRAM
V
CC
V
EE
AGND
7
11
9
COMP
STS
28
BIPOLAR
12
27 DB11 (MSB)
26 DB10
OFFSET
10V IN
20V IN
13
14
DB9
25
24 DB8
DB7
23
THREE
STATE
BUFFERS
22 DB6
21 DB5
20 DB4
19 DB3
S.A.R
18
17
16
DB2
DB1
DB0 (LSB)
V logic
D GND
1
15
10V
REF
CONTROL
LOGIC
OSCILLATOR
10
8
2
3
4
5
6
12/8 CS A0 R/C CE
REF IN
REF OUT
Figure 1. ADC-674 Functional Block Diagram
DATEL
•
11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
•
Tel: (508) 339-3000
•
www.datel.com
•
e-mail: help@datel.com
20 Jan 2012 MDA_ADC-674.A02_D3 Page 1 of 7