AD5940
Data Sheet
VREF
LPDACCON0
[3]
12-BIT
0
1
SW4
SW3
V
BIAS
+
PA
–
LOW
POWER
DAC
LPTIASW0
[12]
V
PIN
BIAS0
V
ZERO
6-BIT
0
1
+
LPTIA
–
LPTIASW0
[13]
SW2
SW1
V
ZERO0
PIN
LPDACCON0
[4]
+
HSTIA
–
SW0
Figure 15. Low Power DAC Switches
MAIN DAC
VREF_2.5V
TO TOP
MUX
2.4V
TO BOTTOM
MUX
R1
TO TOP
MUX
2.366V
TO BOTTOM
MUX
SUB DAC
SET BY
LPDACDAT0
[5:0]
63R1
TO TOP
MUX
62R1
61R1
TO BOTTOM
MUX
63R2
62R2
12-BIT DAC
SELECTS 6MSBs
VIA VOLTAGE
ACROSS ONE
OF THE MAIN
DAC RESISTORS
(LPDACDAT0DAT[11:6])
12-BIT
DAC
OUTPUT
MAIN
DAC
STRING
(6-BITS)
6-BIT DAC
OUTPUT
SET BY
LPDACDAT0
[11:0]
SET BY
LPDACDAT0
[17:12]
TO TOP
MUX
2R2
R2
TO BOTTOM
MUX
3R1
2R1
TO TOP
MUX
TO BOTTOM
MUX
TO TOP
MUX
1R1
TO BOTTOM
MUX
0.2V
Figure 16. Low Power DAC Resistor String
Rev. 0 | Page 28 of 130
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