DAC8412BTC/883 AD [Analog Devices], DAC8412BTC/883 Datasheet - Page 12

• Manufacturer Part Number: DAC8412BTC/883
• Description: Quad, 12-Bit DAC Voltage Output with Readback
• Manufacturer: AD [Analog Devices]

DAC8412/DAC8413
Careful attention to grounding is important to accurate opera-
tion of the DAC8412. This is not because the DAC8412 is
more sensitive than other 12-bit DACs, but because with four
outputs and two references there is greater potential for ground
loops. Since the DAC8412 has no analog ground, the ground
must be specified with respect to the reference.
Reference Configurations
Output voltage ranges can be configured as either unipolar or
bipolar, and within these choices a wide variety of options exists.
The unipolar configuration can be either positive or negative
voltage output, and the bipolar configuration can be either sym-
metrical or nonsymmetrical.
INPUT
REF10
+15V
DB11..DB0
V
LOGIC
OUTPUT
TRIM
Figure 36. Unipolar +10 V Operation
+
R/W
CS
A0
A1
DATAOUT_DB11
10k
READBACK
+10V OPERATION
OP400
OP-400
0.2 F
V
DGND
V
REFL
REFH
DAC8412
DAC8413
+15V
–15V
Figure 35. Simplified I/O Logic Diagram
OR
V
V
DD
SS
0.1 F
//10 F
READOUTBAR
READBACKDATAIN_DB11
–12–
Figure 37 (Symmetrical Bipolar Operation) shows the DAC8412
configured for ± 10 V operation. Note: See the AD688 data
sheet for a full explanation of reference operation. Adjustments may
not be required for many applications since the AD688 is a very
high accuracy reference. However if additional adjustments are
required, adjust the DAC8412 full scale first. Begin by loading
the digital full-scale code (FFF
Adjust potentiometer to attain a DAC output voltage of 9.9976 V.
Then, adjust the Balance Adjust to set the center scale output
voltage to 0.000 V.
100k
GAIN
RDDACA
WRDACA
WRDACB
WRDACC
WRDACD
RDDACC
RDDACD
RDDACB
REGISTER
BALANCE
INPUT
Figure 37. Symmetrical Bipolar Operation
100k
WRDB10
WRDB11
WRDB0
WRDB1
WRDB2
WRDB3
WRDB4
WRDB5
WRDB6
WRDB7
WRDB8
WRDB9
READBACKDATAIN_DB10
AD688
AD588
+15V
REGISTER
READOUT
OUTPUT
39k
FOR
FOR
10V
5V
DAC A
DAC B
DAC C
DAC D
V
1 F
H
REFH
), and then adjust the Gain
0.2 F
0.2 F
6.2
6.2
V
DD
5 OR
V
SS
V
V
DAC8412
DAC8413
REFH
REFL
10V OPERATION
+15V
–15V
V
OR
V
DD
SS
V
V
V
V
V
LDAC
RESET
OUTD
OUTA
OUTB
OUTC
REFL
REV. D
0.1 F
//10 F