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LTC1590
Dual Serial 12-Bit
Multiplying DAC
Daisy-Chained Control Outputs
The LTC
1590 is a dual, serial input 12-bit multiplying
digital-to-analog converter (DAC). It includes two current
output multiplying CMOS DACs and an easy SPI compat-
ible serial interface with daisy-chain output. An asynchro-
nous CLR pin sets both DACs to zero scale.
Excellent accuracy, stability and versatility are combined
with the smallest package available for a dual 12-bit
multiplying DAC.
Parts are available in 16-pin PDIP and narrow SO pack-
ages and are specified over the commercial and industrial
temperature ranges.
DESCRIPTION
U
FEATURES
s
DNL and INL Over Temperature:
±0.5LSB Max
s
Gain Error:
±1LSB Max
s
Low Supply Current: 10
A Max
s
4-Quadrant Multiplication
s
Power-On Reset
s
Asynchronous Clear Input
s
Daisy-Chain 3-Wire Serial Interface
s
16-Pin Narrow SO and PDIP Packages
APPLICATIONS
U
s
Process Control and Industrial Automation
s
Software Controlled Gain Adjustment
s
Digitally Controlled Filter and Power Supplies
s
Automatic Test Equipment
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
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Integral Nonlinearity Over
Temperature DAC A
DIGITAL INPUT CODE
0
INL
(LSB)
1024
2048
3072
4095
LTC1590 TA02
1.0
0.5
0
–0.5
–1.0
512
1536
2560
3584
THREE
SUPERIMPOSED
CURVES
TA = –40°C,
25
°C, 85°C
DIGITAL INPUT CODE
0
INL
(LSB)
1024
2048
3072
4095
LTC1590 TA03
1.0
0.5
0
–0.5
–1.0
512
1536
2560
3584
THREE
SUPERIMPOSED
CURVES
TA = –40°C,
25
°C, 85°C
Integral Nonlinearity Over
Temperature DAC B
13
16
9
1
2
12
10
LTC1590 TA01
14
11
3
6
5
4
8
VOUT B
±10V
VOUT A
±10V
5V
VIN A
±10V
VIN B
±10V
15
5V
7
33pF
LT
1112
15V
–15V
DAC B
VCC
VREF B RFB B
VREF A RFB A
DAC A
24-BIT
SHIFT
REG
AND
LATCH
DIN
DOUT
CLK
CS/LD
CLR
DGND
AGND
LTC1590
OUT1 B
OUT2 B
OUT1 A
OUT2 A
P
+
–
+
–
Dual 12-Bit 2-Quadrant Multiplying DAC