S E M I C O N D U C T O R
HI-574A, HI-674A,
HI-774
Complete, 12-Bit A/D Converters
with Microprocessor Interface
Description
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 Harris 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/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.
August 1997
Features
• 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
• Minimal Setup Time for Control Signals
• Fast Conversion Times
- 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
O
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
Applications
• Military and Industrial Data Acquisition Systems
• Electronic Test and Scientific Instrumentation
• Process Control Systems
Pinouts
NC
BYTE ADDRESS/
SHORT CYCLE, A
O
CHIP SELECT, CS
DATA MODE
SELECT, 12/8
+5V SUPPLY, V
LOGIC
(PDIP, SBDIP)
TOP VIEW
+5V SUPPLY, V
LOGIC
1
DATA MODE SEL, 12/8
CHIP SEL, CS
BYTE ADDR/SHORT
CYCLE, A
O
READ/CONVERT, R/C
CHIP ENABLE, CE
2
3
4
5
6
28 STATUS, STS
27 DB11
26 DB10
NC
25 DB9
24 DB8
23 DB7
22 DB6
21 DB5
20 DB4
19 DB3
18 DB2
17 DB1
16 DB0
LSB
DIGITAL
DATA
OUTPUTS
NC 7
NC 8
READ CONVERT, R/C 9
CHIP ENABLE, CE 10
+15V SUPPLY, V
CC
+10V REFERENCE,
REF OUT
ANALOG COMMON, AC
REFERENCE INPUT,
REF IN
-15V SUPPLY, V
EE
11
12
13
14
15
MSB
(CLCC)
TOP VIEW
STATUS, STS
DB11, MSB
DB10
NC
6
5
4
3
2
1 44 43 42 41 40
39 NC
38 NC
37 DB9
36 DB8
35 DB7
34 DB6
33 DB5
32 DB4
31 DB3
30 NC
29 DB2
+12V/+15V SUPPLY, V
CC
7
+10V REF, REF OUT
ANALOG
COMMON, AC
8
9
REFERENCE INPUT 10
-12V/-15V SUPPLY, V
EE
11
BIPOLAR OFFSET 12
BIP OFF
10V INPUT 13
20V INPUT 14
NC 16
BIPOLAR OFFSET, 17
BIP OFF
15 DIG COMMON,
DC
18 19 20 21 22 23 24 25 26 27 28
NC
DIG
COMMON, DC
(LSB) DB0
NC
NC
NC
NC
10V
20V
NC
DB1
NC
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
©
Harris Corporation 1997
File Number
3096.4
6-7
HI-574A, HI-674A, HI-774
Absolute Maximum Ratings
Supply Voltage
V
CC
to Digital Common . . . . . . . . . . . . . . . . . . . . . . 0V to +16.5V
V
EE
to Digital Common. . . . . . . . . . . . . . . . . . . . . . . 0V to -16.5V
V
LOGIC
to Digital Common . . . . . . . . . . . . . . . . . . . . . . 0V to +7V
Analog Common to Digital Common±1V
Control Inputs
(CE, CS, A
O
, 12/8, R/C) to Digital Common . . -0.5V to V
LOGIC
+0.5V
Analog Inputs
(REFIN, BIPOFF, 10VIN) to Analog Common. . . . . . . . . .
±16.5V
20VIN to Analog Common . . . . . . . . . . . . . . . . . . . . . . . . . .
±24V
REFOUT . . . . Indefinite Short To Common, Momentary Short To V
CC
Thermal Information
Thermal Resistance (Typical, Note 1)
θ
JA
(
o
C/W)
θ
JC
(
o
C/W)
CLCC Package . . . . . . . . . . . . . . . . . .
65
14
SBDIP Package . . . . . . . . . . . . . . . . . .
60
18
HI3-574AxN-5, HI3-674AxN-5, HI3-774xN-5 65
N/A
Maximum Junction Temperature
HI3-574AxN-5, HI3-674AxN-5, HI3-774xN-5. . . . . . . . . . . . 150
o
C
HI1-574AxD-2, HI1-574AxD-5 . . . . . . . . . . . . . . . . . . . . . . . 175
o
C
HI1-674AxD-2, HI1-674AxD-5 . . . . . . . . . . . . . . . . . . . . . . . 175
o
C
HI1-774xD-2, HI1-774xD-5 . . . . . . . . . . . . . . . . . . . . . . . . . 175
o
C
Maximum Storage Temperature Range
HI3-574AxN-5, HI3-674AxN-5, HI3-774xN-5. . . . . .-40
o
C to 85
o
C
HI1-574AxD-2, HI1-574AxD-5 . . . . . . . . . . . . . . . .-65
o
C to 150
o
C
HI1-674AxD-2, HI1-674AxD-5 . . . . . . . . . . . . . . . .-65
o
C to 150
o
C
HI1-774xD-2, HI1-774xD-5 . . . . . . . . . . . . . . . . . .-65
o
C to 150
o
C
Maximum Lead Temperature (Soldering, 10s) . . . . . . . . . . . . 300
o
C
Operating Conditions
Temperature Range
HI3-574AxN-5, HI1-574AxD-5 . . . . . . . . . . . . . . . . . .0
o
C to 75
o
C
HI3-674AxN-5, HI1-674AxD-5 . . . . . . . . . . . . . . . . . .0
o
C to 75
o
C
HI3-774xN-5, HI1-774xD-5 . . . . . . . . . . . . . . . . . . . . .0
o
C to 75
o
C
HI1-574AxD-2, HI1-674AxD-2, HI1-774xD-2 . . . . -55
o
C to 125
o
C
Die Characteristics
Transistor Count
HI-574A, HI-674A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1117
HI-774 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2117
DC and Transfer Accuracy Specifications
Typical at 25
o
C with V
CC
= +15V or +12V, V
LOGIC
= +5V, V
EE
= -15V or -12V,
Unless Otherwise Specified
TEMPERATURE RANGE
-5 (0
o
C to 75
o
C)
PARAMETER
DYNAMIC CHARACTERISTICS
Resolution (Max)
Linearity Error
25
o
C (Max)
0
o
C to 75
o
C (Max)
Max Resolution For Which No Missing Codes Is Guaranteed
25
o
C
HI-574A, HI-674A
HI-774
T
MIN
to T
MAX
HI-574A, HI-674A
HI-774
Unipolar Offset (Max)
Adjustable to Zero
Bipolar Offset (Max)
V
IN
= 0V (Adjustable to Zero)
V
IN
= -10V
Full Scale Calibration Error
25
o
C (Max), With Fixed 50Ω Resistor From REF OUT To REF IN
(Adjustable to Zero)
T
MIN
to T
MAX
(No Adjustment At 25
o
C)
T
MIN
to T
MAX
(With Adjustment To Zero 25
o
C)
J SUFFIX
K SUFFIX
L SUFFIX
UNITS
12
±1
±1
12
±
1
/
2
±
1
/
2
12
12
12
12
±1.5
±4
±0.1
±0.25
±0.375
±0.12
12
±
1
/
2
±
1
/
2
12
12
12
12
±1
±3
±0.1
±0.15
±0.20
±0.05
Bits
LSB
LSB
12
11
11
11
±2
±4
±0.15
±0.25
±0.475
±0.22
Bits
Bits
Bits
Bits
LSB
LSB
% of FS
% of FS
% of FS
% of FS
6-10
Embedded System
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