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LTC1590I Datasheet(PDF) 8 Page - Linear Technology

Part # LTC1590I
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

LTC1590I Datasheet(HTML) 8 Page - Linear Technology

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8
LTC1590
Unipolar 2-Quadrant Multiplying Mode
(VOUT = 0V to –VREF)
The LTC1590 can be used with a dual op amp to provide
a dual 2-quadrant multiplying DAC as shown in Figure 2.
The unipolar DAC transfer function is shown in Table 1.
The 33pF feedback capacitor is recommended to compen-
sate for the pole caused by the internal feedback resistor
and the OUT1 output capacitance. For high speed op amps
this feedback capacitor is required for stability, and a
smaller value, 8pF to 15pF, may be desired to get the
fastest transient response and shortest settling time. A
larger feedback capacitor can be used to reduce wideband
noise, glitch impulse and distortion for lower frequency
signals. A pole is introduced in the DAC transfer function
at approximately (CFB)(RFB). For example, a 100pF feed-
back capacitor will typically give a pole at:
145
1
2100
11
kHz
pF
k
=
()( )
πΩ
APPLICATIONS INFORMATION
Figure 3. Bipolar Operation (4-Quadrant Multiplication)
–15V
5V
0.1
µF
VCC
VREF
LTC1590
DAC A OR DAC B
RFB
DGND
AGND
VREF
–10V TO 10V
OUT1
OUT2
VOUT
–VREF TO VREF
1590 F03
15V
1/2
LT1112
R3
20k
R1
10k
R2
20k
15V
–15V
1/2
LT1112
33pF
Table 1. Unipolar Binary Code Table
DIGITAL INPUT
BINARY NUMBER
ANALOG OUTPUT
IN DAC REGISTER
VOUT
MSB
LSB
1111 1111 1111
– VREF (4095/4096)
1000 0000 0000
– VREF (2048/4096) = – VREF/2
0000 0000 0001
– VREF (1/4096)
0000 0000 0000
0V
Bipolar 4-Quadrant Multiplying Mode
(VOUT = –VREF to +VREF)
The circuit of Figure 3 can be used to provide a dual
4-quadrant multiplying DAC. This circuit starts with the
unipolar application circuit and adds three resistors and an
op amp. These extra devices provide a gain of – 2 from the
unipolar output to the bipolar output, plus an offset of
(–1)(VREF) to produce the transfer function shown in Table
2. A pack of matched 20k resistors, with two resistors in
parallel forming the 10k resistor, is recommended.
Table 2. Bipolar Offset Binary Code Table
DIGITAL INPUT
BINARY NUMBER
ANALOG OUTPUT
IN DAC REGISTER
VOUT
MSB
LSB
1111 1111 1111
+VREF (2047/2048)
1000 0000 0001
+VREF (1/2048)
1000 0000 0000
0V
0111 1111 1111
– VREF (1/2048)
0000 0000 0000
– VREF (2048/2048) = – VREF
VCC
VREF
LTC1590
DAC A OR DAC B
RFB
DGND
AGND
5V
VREF
–10V TO 10V
OUT2
OUT1
33pF
VOUT
0V TO –VREF
1590 F02
0.1
µF
1/2
LT1112
15V
–15V
Figure 2. Unipolar Operation (2-Quadrant Multiplication)


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