
15
LTC1591/LTC1597
15917fa
APPLICATIONS INFORMATION
WU
U
Figure 2a. Bipolar Operation (4-Quadrant Multiplication) VOUT = – VREF to VREF
Figure 2b. Bipolar Operation (4-Quadrant Multiplication) VOUT = – VREF to VREF
VCC
LTC1591-1
RFB
ROFS
5V
LD
3
2
98
28
23
7
22
R1
RCOM
1
REF
4
5
0.1
μF
6
IOUT1
33pF
VOUT =
–VREF
TO VREF
1591/97 F02a
AGND
DGND
–
+
1/2 LT1112
WR
10 TO 21,
24, 25
WR
CLR
VREF
–
+
1/2 LT1112
14-BIT DAC
R1
R2
14
DATA
INPUTS
Bipolar Offset Binary Code Table
DIGITAL INPUT
BINARY NUMBER
IN DAC REGISTER
VREF (8,191/8,192)
VREF (1/8,192)
0V
–VREF (1/8,192)
–VREF
LSB
1111
11
0000
01
0000
00
1111
11
0000
00
ANALOG OUTPUT
VOUT
MSB
1111
1000
0111
0000
27
NC
26
NC
VCC
LTC1597-1
RFB
ROFS
5V
LD
3
2
98
28
23
7
22
R1
RCOM
1
REF
4
5
0.1
μF
6
IOUT1
33pF
VOUT =
–VREF
TO VREF
1591/97 F02b
AGND
DGND
–
+
1/2 LT1112
WR
10 TO 21,
24 TO 27
WR
CLR
VREF
–
+
1/2 LT1112
16-BIT DAC
R1
R2
16
DATA
INPUTS
Bipolar Offset Binary Code Table
DIGITAL INPUT
BINARY NUMBER
IN DAC REGISTER
VREF (32,767/32,768)
VREF (1/32,768)
0V
–VREF (1/32,768)
–VREF
LSB
1111 1111
1111
0000 0000
0001
0000 0000
0000
1111 1111
1111
0000 0000
0000
ANALOG OUTPUT
VOUT
MSB
1111
1000
0111
0000