S E M I C O N D U C T O R
HI-574A, HI-674A
HI-774
Complete 12-Bit A/D Converter
with Microprocessor Interface
Description
The HI-X74(A) is a complete 12-bit Analog-to-Digital Converter,
including a +10V reference clock, tri-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 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 con-
verter. 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 IC’s. 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
LCC. 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
December 1993
Features
• Complete 12-Bit A/D Converter with Reference and Clock
• Full 8-, 12- or 16-Bit Microprocessor Bus Interface
• 150ns Bus Access Time
• No Missing Codes Over Temperature
• Minimal Setup Time for Control Signals
• Fast Conversion Times
- 25µs Max (HI-574A)
- 15µs Max (HI-674A)
- 9µs Max (HI-774)
• 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)
•
±12V
to
±15V
Operation
Applications
• Military and Industrial Data Acquisition Systems
• Electronic Test and Scientific Instrumentation
• Process Control Systems
Pinouts
(PDIP AND CERAMIC DIP)
TOP VIEW
+5V SUPPLY, V
LOGIC
DATA MODE SEL, 12/8
CHIP SEL, CS
BYTE ADDR/SHORT
CYCLE, A
O
READ/CONVERT, R/C
CHIP ENABLE, CE
+12V/+15V SUPPLY, V
CC
+10V REF, REF OUT
ANALOG
COMMON, AC
1
2
3
4
5
6
7
8
9
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
(LCC)
TOP VIEW
NC
BYTE ADDRESS/
SHORT CYCLE, A
O
CHIP SELECT, CS
DATA MODE
SELECT, 12/8
+5V SUPPLY, V
LOGIC
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
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 I.C. Handling Procedures.
Copyright
©
Harris Corporation 1993
File Number
3096.3
5-34
Specifications 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
Operating 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
Storage Temperature Range
HI3-574AxN-5 . . . . . . . . . . . . . . . . . . . . . . . . . -40
o
C < T
A
< +85
o
C
HI3-674AxN-5 . . . . . . . . . . . . . . . . . . . . . . . . . -40
o
C < T
A
< +85
o
C
HI3-774xN-5 . . . . . . . . . . . . . . . . . . . . . . . . . . -40
o
C < T
A
< +85
o
C
HI1-574AxD-2, HI1-574AxD-5 . . . . . . . . . . . -65
o
C < T
A
< +150
o
C
HI1-674AxD-2, HI1-674AxD-5 . . . . . . . . . . . -65
o
C < T
A
< +150
o
C
HI1-774xD-2, HI1-774xD-5 . . . . . . . . . . . . . . -65
o
C < T
A
< +150
o
C
Lead Temperature (Soldering, 10s) . . . . . . . . . . . . . . . . . . . . 300
o
C
Thermal Information
Thermal Resistance
θ
JA
HI3-574AxN-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
o
C/W
HI3-674AxN-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
o
C/W
HI3-774xN-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
o
C/W
Power Dissipation at +75
o
C (Note 1)
HI3-574AxN-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mW
HI3-674AxN-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mW
HI3-774xN-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mW
HI1-574AxD-x . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2080mW
HI1-674AxD-2, HI1-674AxD-5 . . . . . . . . . . . . . . . . . . . . . 2083mW
HI1-774xD-2, HI1-774xD-5 . . . . . . . . . . . . . . . . . . . . . . . 2083mW
HI4-574AxE-x . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2270mW
Transistor Count
HI-574A, HI-674A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1117
HI-774 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2117
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
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)
PARAMETERS
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
12
12
Bits
±1
±1
±
1
/
2
±
1
/
2
±
1
/
2
±
1
/
2
LSB
LSB
12
11
11
11
12
12
12
12
12
12
12
12
Bits
Bits
Bits
Bits
±2
±1.5
±1
LSB
±4
±0.15
±4
±0.1
±3
±0.1
LSB
% of F.S.
±0.25
±0.475
±0.22
±0.25
±0.375
±0.12
±0.15
±0.20
±0.05
% of F.S.
% of F.S.
% of F.S.
5-37
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