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Intersil Electronic Components Datasheet

ICL7121 Datasheet

16-Bit Multiplying Microprocessor-Compatible D/A Converter

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ICL7121 pdf
October 1997
®
ICL7121NOT
RECOMMENDED
FOR NEW DESIGNS
16-Bit Multiplying
Microprocessor-Compatible D/A Converter
Features
• 16-Bit Resolution
• Low Integral Linearity Error -0.003% FSR
• Monotonic to 16 Bits Over Full Military Temperature
Range (LM Grade)
• 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)
• Full Four-Quadrant Multiplication
• Low Differential Nonlinearity Error at Bipolor Zero
Ordering Information
PART NUMBER
ICL7121JCJI
ICL7121JMJI
ICL7121KCJI
ICL7121KMJI
ICL7121LCJI
ICL7121LMJI
TEMP. RANGE
(oC)
PACKAGE
0 to 70
28 Ld CERDIP
-55 to 125 28 Ld CERDIP
0 to 70
28 Ld CERDIP
-55 to 125 28 Ld CERDIP
0 to 70
28 Ld CERDIP
-55 to 125 28 Ld CERDIP
Description
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.
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.
The ICL7121 is designed and programmed for bipolar
operation. There is an offset resistor to the output which
should be connected to -VREF and an inverter on the MSB
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.
www.DatPaSihneoetu4Ut.com
ICL7121
(OUTLINE DWG JI)
TOP VIEW
(LSB) D0 1
D1 2
D2 3
D3 4
D4 5
D5 6
D6 7
D7 8
D8 9
D9 10
D10 11
D11 12
D12 13
D13 14
28 CS
27 WR
26 V+
25 IOUT
24 AGNDS
23 AGNDF
22 DGND
21 RFB
20 ROFS
19 RINV
18 VREF
17 PROG
16 D15 (MSB)
15 D14
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2002. All Rights Reserved
1
File Number 3112.1



Intersil Electronic Components Datasheet

ICL7121 Datasheet

16-Bit Multiplying Microprocessor-Compatible D/A Converter

No Preview Available !

ICL7121 pdf
Functional Block Diagram
ICL7121
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2



Intersil Electronic Components Datasheet

ICL7121 Datasheet

16-Bit Multiplying Microprocessor-Compatible D/A Converter

No Preview Available !

ICL7121 pdf
ICL7121
Pin Descriptions
28 LEAD PIN
CERDIP NAME
PIN DESCRIPTION
1 D0 Bit 0 Least Significant
2 D1 Bit1
3 D2 Bit 2
4 D3 Bit 3
5 D4 Bit 4
6 D5 Bit 5
7 D6 Bit 6
8 D7 Bit 7
9 D8 Bit 8
Input Data Bits (High = True)
10 D9 Bit 9
11 D10 Bit 10
12 D11 Bit 11
13 D12 Bit 12
14 D13 Bit 13
15 D14 Bit 14
16 D15 Bit 15 Most significant
17 PROG Used for programming only. Tie to +5V for normal operation.
18 VREF VREF input to ladder.
www.DataShe1e9t4U.comRINV Summing node for reference inverting amplifier.
20 ROFS Bipolar offset resistor, to -VREF.
21 RFB Feedback resistor for voltage output applications.
22 DGND Digital Ground Return.
23 AGNDF Analog Ground force lines. Use to carry current from internal Analog GND connections.
24 AGNDS Analog Ground sense line. Reference point for external circuitry. Pin should carry minimal current.
25 IOUT Current output pin.
26 V+ Positive Supply.
27 CS CHIP SELECT (active low). Enables register write.
28 WR WRITE, (active low). Writes in register. Equivalent to CS.
3




Part Number ICL7121
Description 16-Bit Multiplying Microprocessor-Compatible D/A Converter
Maker Intersil Corporation
Total Page 10 Pages
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ICL7121 pdf
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