HI-574A, HI-674A,
HI-774
Complete, 12-Bit A/D Converters
with Microprocessor Interface
August 1997
Features
Description
• Complete 12-Bit A/D Converter with Reference and Clock
• Full 8-Bit, 12-Bit or 16-Bit Microprocessor Bus Interface
• Bus Access Time . . . . . . . . . . . . . . . . . . . . . . . . . . 150ns
• No Missing Codes Over Temperature
The HI-X74(A) is a complete 12-bit, Analog-to-Digital
Converter, including a +10V reference clock, three-state out-
puts and a digital interface for microprocessor control. Succes-
sive approximation conversion is performed by two monolithic
dice housed in a 28 lead package. The bipolar analog die fea-
tures the Intersil Dielectric Isolation process, which provides
enhanced AC performance and freedom from latch-up.
• Minimal Setup Time for Control Signals
• Fast Conversion Times
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.
- HI-574A (Max) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25µs
- HI-674A (Max) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15µs
- HI-774 (Max) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9µs
• Digital Error Correction (HI-774)
• Low Noise, via Current-Mode Signal
Transmission Between Chips
• Byte Enable/Short Cycle (A Input)
O
- Guaranteed Break-Before-Make Action, Eliminating
Bus Contention During Read Operation. Latched by
Start Convert Input (To Set the Conversion Length)
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.
• Supply Voltage . . . . . . . . . . . . . . . . . . . . . ±12V to ±15V
Power requirements are +5V and ±12V to ±15V, with typical
dissipation of 385mW (HI-574A/674A) and 390mW (HI-774) at
12V. All models are available in sidebrazed DIP, PDIP, and
CLCC. For additional HI-Rel screening including 160 hour burn-
in, specify “-8” suffix. For MIL-STD-883 compliant parts, request
HI-574A/883, HI-674A/883, and HI-774/883 data sheets.
Applications
• Military and Industrial Data Acquisition Systems
• Electronic Test and Scientific Instrumentation
• Process Control Systems
Pinouts
(PDIP, SBDIP)
TOP VIEW
(CLCC)
TOP VIEW
+5V SUPPLY, V
LOGIC
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
STATUS, STS
DB11 MSB
DB10
DATA MODE SEL, 12/8
3
CHIP SEL, CS
BYTE ADDR/SHORT
4
DB9
CYCLE, A
O
44
43 42 41 40
6
5
4
3
2
1
5
DB8
READ/CONVERT, R/C
CHIP ENABLE, CE
7
39
38
NC
NC
NC
NC
6
DB7
8
DIGITAL
+12V/+15V SUPPLY, V
CC
7
DATA
DB6
DB5
DB4
DB3
DB2
DB1
DB0
READ CONVERT, R/C
9
37 DB9
OUTPUTS
10
11
12
DB8
DB7
DB6
DB5
DB4
DB3
NC
+10V REF, REF OUT
8
CHIP ENABLE, CE
36
35
34
33
32
31
30
29
+15V SUPPLY, V
CC
+10V REFERENCE,
REF OUT
ANALOG
COMMON, AC
9
10
11
12
REFERENCE INPUT
ANALOG COMMON, AC 13
-12V/-15V SUPPLY, V
EE
REFERENCE INPUT,
14
REF IN
-15V SUPPLY, V
EE
BIPOLAR OFFSET
BIP OFF
15
10V INPUT 13
NC 16
BIPOLAR OFFSET,
LSB
DIG COMMON,
DC
17
DB2
14
20V INPUT
BIP OFF
18 19 20 21 22 23 24 25 26 27 28
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
File Number 3096.4
1-888-INTERSIL or 321-724-7143 | Copyright © Intersil Corporation 1999
6-952
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