LTC1590
Dual Serial 12-Bit
Multiplying DAC
FEATURES
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DESCRIPTION
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
DNL and INL Over Temperature:
±
0.5LSB Max
Gain Error:
±
1LSB Max
Low Supply Current: 10
µ
A Max
4-Quadrant Multiplication
Power-On Reset
Asynchronous Clear Input
Daisy-Chain 3-Wire Serial Interface
16-Pin Narrow SO and PDIP Packages
APPLICATIONS
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Process Control and Industrial Automation
Software Controlled Gain Adjustment
Digitally Controlled Filter and Power Supplies
Automatic Test Equipment
TYPICAL APPLICATION
1.0
Dual 12-Bit 2-Quadrant Multiplying DAC
5V
16
V
CC
13 D
IN
14 CLK
µP
24-BIT
SHIFT
REG
AND
LATCH
V
REF B
R
FB B
DAC B
OUT2 B 4
11 CS/LD
OUT1 B 3
INL (LSB)
V
IN A
±10V
9
V
IN B
±10V
1
2
33pF
15V
LT
®
1112
Daisy-Chained Control Outputs
–
+
V
OUT B
±10V
8
V
REF A
R
FB A
DAC A
OUT2 A 5
33pF
OUT1 A 6
–
+
V
OUT A
±10V
12 D
OUT
CLR
15
5V
DGND
10
AGND
7
LTC1590
–15V
LTC1590 • TA01
INL (LSB)
U
U
U
Integral Nonlinearity Over
Temperature DAC A
THREE
SUPERIMPOSED
CURVES
T
A
= –40°C,
25°C, 85°C
0.5
0
–0.5
–1.0
0
512 1024 1536 2048 2560 3072 3584 4095
DIGITAL INPUT CODE
LTC1590 • TA02
Integral Nonlinearity Over
Temperature DAC B
1.0
THREE
SUPERIMPOSED
CURVES
T
A
= –40°C,
25°C, 85°C
0.5
0
–0.5
–1.0
0
512 1024 1536 2048 2560 3072 3584 4095
DIGITAL INPUT CODE
LTC1590 • TA03
1
LINER [ LINEAR TECHNOLOGY ]
