HI-574A, HI-674A
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wComplete, 12-Bit A/D Converters with
August 7, 2008
FN3096.6
Features
Microprocessor Interface
• Complete 12-Bit A/D Converter with Reference and Clock
The HI-X74(A) is a complete 12-bit, Analog-to-Digital
Converter, including a +10V reference clock, three-state
outputs and a digital interface for microprocessor control.
Successive approximation conversion is performed by two
monolithic dice housed in a 28 lead package. The bipolar
analog die features the Intersil Dielectric Isolation process,
which provides enhanced AC performance and freedom
from latch-up.
Custom design of each IC (bipolar analog and CMOS digital)
has yielded improved performance over existing versions of
this converter. The voltage comparator features high PSRR
plus a high speed current-mode latch, and provides precise
decisions down to 0.1 LSB of input overdrive. More than 2X
reduction in noise has been achieved by using current
instead of voltage for transmission of all signals between the
analog and digital ICs. Also, the clock oscillator is current
controlled for excellent stability over temperature.
The HI-X74(A) offers standard unipolar and bipolar input
ranges, laser trimmed for specified linearity, gain and offset
accuracy. The low noise buried zener reference circuit is
trimmed for minimum temperature coefficient.
Power requirements are +5V and ±12V to ±15V, with typical
dissipation of 385mW (HI-574A, HI-674A) at 12V.
• Full 8-Bit, 12-Bit or 16-Bit Microprocessor Bus Interface
• Bus Access Time . . . . . . . . . . . . . . . . . . . . . . . . . . . 150ns
• No Missing Codes Over Temperature
• Minimal Setup Time for Control Signals
• Fast Conversion Times
- HI-574A (Max) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25µs
- HI-674A (Max) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15µs
• Low Noise, via Current-Mode Signal Transmission
Between Chips
• Byte Enable/Short Cycle (AO Input)
- Guaranteed Break-Before-Make Action, Eliminating Bus
Contention During Read Operation. Latched by Start
Convert Input (To Set the Conversion Length)
• Supply Voltage . . . . . . . . . . . . . . . . . . . . . . ±12V to ±15V
• Pb-Free Available (RoHS Compliant)
Applications
• Military and Industrial Data Acquisition Systems
• Electronic Test and Scientific Instrumentation
• Process Control Systems
Pinout
HI-574A, HI-674A
(28 LD PDIP, SBDIP)
TOP VIEW
+5V SUPPLY, VLOGIC
1
28 STATUS, STS
DATA MODE SEL, 12/8
2
27 DB11
CHIP SEL, CS
3
26 DB10
BYTE ADDR/SHORT
CYCLE, AO
4
25 DB9
READ/CONVERT, R/C
5
24 DB8
CHIP ENABLE, CE
6
23 DB7
+12V/+15V SUPPLY, VCC
7
22 DB6
+10V REF, REF OUT
8
21 DB5
ANALOG
COMMON, AC
MSB
DIGITAL
DATA
OUTPUTS
20 DB4
19 DB3
-12V/-15V SUPPLY, VEE 11
18 DB2
BIPOLAR OFFSET 12
BIP OFF
17 DB1
10V INPUT 13
16 DB0
20V INPUT 14
1
9
REFERENCE INPUT 10
15 DIG COMMON,
DC
LSB
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2001, 2008, 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
