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LTC1590 Datasheet(PDF) 7 Page - Linear Technology

Part # LTC1590
Description  Dual Serial 12-Bit Multiplying DAC
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1590 Datasheet(HTML) 7 Page - Linear Technology

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LTC1590
TIMING DIAGRAMS
D11 A
MSB
D10 A
D9 A
D1 B
t1
t6
D0 B
LSB
t2
t4
t3
t 9
CLK
DIN
DOUT
CS/LD
t5
1590 TD02
D11 A
PREVIOUS WORD
D10 A
PREVIOUS WORD
D0 B
PREVIOUS WORD
D11 A
CURRENT WORD
D9 A
PREVIOUS WORD
t8
t7
12
3
23
24
TIMING DIAGRAM
APPLICATIONS INFORMATION
Description
The LTC1590 is a dual 12-bit multiplying DAC that has
serial inputs and current outputs. It uses precision R/2R
resistor ladder technology to provide exceptional linearity
and stability. The device operates from a single 5V supply
and provides a
±10V reference input and voltage output
range when used with an external op amp.
Serial I/O
The LTC1590 has a 3-wire SPI/MICROWIRE
TM compatible
serial port that accepts 24-bit serial words. Data is loaded
MSB first with the first 12 bits controlling DAC A and the
second 12 bits controlling DAC B. Data is shifted into the
DIN input on the rising edge of CLK. The CS/LD input must
be taken low before transferring data to enable the CLK
input. After transferring data, CS/LD is pulled high to load
data from the shift register to the DAC registers which
updates both DACs.
The buffered output of the 24-bit shift register is available
on the DOUT pin. Multiple DACs can be daisy-chained on
one 3-wire interface by connecting the DOUT pin to the DIN
pin of the next DAC (see the Timing Diagrams section).
MICROWIRE is a trademark of National Semiconductor Corporation.
R
R
RO
VREF A
VREF B
RFB A
RFB B
OUT1 A
OUT1 B
OUT2 A
OUT2 B
AGND
1590 F01
ILKG
COUT
CODE
4096
VREF
R
()( )
Equivalent Circuit
Figure 1 shows an equivalent analog circuit for the LTC1590
DACs. R is the reference input, RREF, which is nominally
11k. The DAC output is represented by the Thevinin
equivalent current source with a value of:
(Code/4096)(VREF/R)
The current source ILKG models the junction leakage of the
DAC output switches. ILKG is typically less than 5nA at
85
°C and decreases by roughly two times for every 10°C
reduction in temperature. COUT is the output capacitance,
and it also comes from the DAC output switches and varies
from 30pF at zero scale to 60pF at full scale. RO is the
equivalent output resistance, which varies with digital
input code (see Op Amp Selection section).
Figure 1. Equivalent Circuit


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