DAC8413_15 Datasheet, PDF (16/20 Pages) Analog Devices – Quad, 12-Bit DAC Voltage Output with Readback

DAC8412/DAC8413
Data Sheet
CS
A0
A1
R/W
DB11..DB0
V_LOGIC
READBACK
DATAOUT_DB11
V_REFH
V_DD V_SS
RDDACA WRDB0
WRDB1
WRDACA _WRDB2
DAC A
RDDACB
WRDB3
WRDB4
DAC B
WRDACB WRDB5
INPUT
OUTPUT
REGISTER WRDB6 REGISTER
RDDACC
WRDB7
WRDACC ^WRDB8
WRDB9
DAC C
RDDACD WRDB10
WRDB11
WRDACD
DAC D
READOUTBAR
READBACKDATAIN_DB11
READBACKDATAIN_DB10
V_OUTA
V_OUTB
V_OUTC
V_OUTD
V_REFL
LDAC
RESET
READOUT
DGND
Figure 38. Simplified I/O Logic Diagram
Careful attention to grounding is important for accurate
operation 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. Because 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 symmetrical or nonsymmetrical.
+15V
+
+15V
INPUT
OUTPUT
REF10
TRIM
10kΩ
OP400
V_REFH
0.2µF
V_REFL
+10V OPERATION
V_DD
DAC8412
OR
DAC8413
V_SS
0.1µF
//10µF
–15V
Figure 39. Unipolar +10 V Operation
+15V
39kΩ
+15V
BALANCE
100kΩ
GAIN
100kΩ
6.2Ω
AD688 FOR ±10V
AD588 FOR ±5V
0.2µF
6.2Ω
0.2µF
V_DD
V_REFH
DAC8412
OR
DAC8413
V_REFL
V_SS
0.1µF
//10µF
1µF
–15V
±5 OR ±10V OPERATION
Figure 40. Symmetrical Bipolar Operation
Figure 40 (symmetrical bipolar operation) shows the DAC8412
configured for ±10 V operation. 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 (0xFFF), and then adjust the gain
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.
Rev. G | Page 16 of 20