®
ICL7121
16-Bit Multiplying
October 1997
Microprocessor-Compatible D/A Converter
Features
Description
• 16-Bit Resolution
The ICL7121 achieves 0.003% linearity without laser
trimming by combining a four quadrant multiplying DAC
using thin film resistors with an on-chip PROM-controlled
correction circuit. Silicon-gate CMOS circuitry keeps the
power dissipation very low.
• Low Integral Linearity Error -0.003% FSR
• Monotonic to 16 Bits Over Full Military Temperature
Range (LM Grade)
Microprocessor bus interfacing is eased using standard
memory WRITE cycle timing and control. The input buffer
register is loaded with the 16-bit input and directly controls
the output switches. The register is transparent if WR and
CS are held low.
• Microprocessor Compatible with Buffered Inputs
• Bipolar Application Requires No External Resistors
• Output Current Settling Time 3µs Max (1µs Typ)
• Low Linerarity and Gain Temperature Coefficients
• Low Power Dissipation (25mW)
The ICL7121 is designed and programmed for bipolar
operation. There is an offset resistor to the output which
should be connected to -V
and an inverter on the MSB
REF
• Full Four-Quadrant Multiplication
line, giving the DAC a 2’s complement bipolar transfer
function. Two extra resistors are included on the chip to
facilitate the reference inversion, so that only an external op-
amp is needed.
• Low Differential Nonlinearity Error at Bipolor Zero
Ordering Information
TEMP. RANGE
o
PART NUMBER
ICL7121JCJI
( C)
PACKAGE
28 Ld CERDIP
28 Ld CERDIP
28 Ld CERDIP
28 Ld CERDIP
28 Ld CERDIP
28 Ld CERDIP
0 to 70
ICL7121JMJI
ICL7121KCJI
ICL7121KMJI
ICL7121LCJI
ICL7121LMJI
-55 to 125
0 to 70
-55 to 125
0 to 70
-55 to 125
Pinout
ICL7121
(OUTLINE DWG JI)
TOP VIEW
(LSB) D
1
2
CS
28
0
D
D
D
D
D
D
D
D
D
1
2
3
4
5
6
7
8
9
27 WR
26 V+
25 I
3
4
OUT
24
5
AGND
S
F
6
23 AGND
22 DGND
7
21
20
8
R
R
FB
9
OFS
INV
REF
10
19 R
18
D
D
D
D
10 11
11 12
V
17 PROG
16 D (MSB)
12
13
13
14
15
15
D
14
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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File Number 3112.1
Copyright © Intersil Americas Inc. 2002. All Rights Reserved
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