AD7834 Analog Devices, AD7834 Datasheet - Page 16

• Manufacturer Part Number: AD7834
• Description: LC2MOS Quad 14-Bit DAC
• Manufacturer: Analog Devices

Specifications of AD7834

• Resolution (bits): 14bit
• Dac Update Rate: 100kSPS
• Dac Settling Time: 10µs
• Max Pos Supply (v): +15.75V
• Single-supply: No
• Dac Type: Voltage Out
• Dac Input Format: Ser

AD7834/AD7835
BIPOLAR CONFIGURATION
100kΩ
Figure 20 shows the AD7834/AD7835 setup for ±5 V operation.
The
fed to the V
The code table for bipolar operation of the AD7834/AD7835 is
shown in Table 13.
Table 13. Code Table for Bipolar Operation
MSB
11
10
10
01
00
00
1
2
Binary Number in DAC Latch
V
For V
REF
R2
1
= V
AD588
ADDITIONAL PINS OMITTED FOR CLARITY
REF
100kΩ
REF
(+) = +5 V and V
1111
0000
0000
1111
0000
0000
R3
(+) – V
1μF
C1
REF
provides precision ±5 V tracking outputs that are
REF
(+) and V
10
11
5
7
9
(−).
1111
0000
0000
1111
0000
0000
12
Figure 20. Bipolar ±5 V Operation
AD588
REF
4
8
(−) = –5 V, 1 LSB = 10 V/2
13
REF
6
LSB
1111
0001
0000
1111
0001
0000
R1
39kΩ
(−) inputs of the AD7834/AD7835.
14
15
16
2
3
1
Analog Output (V
V
V
V
V
V
V
REF
REF
REF
REF
REF
REF
V
V
REF
REF
(−) + V
(−) + V
(−) + V
(−) + V
(−) + V
(−) V
+15V
V
DD
(+)
(–)
AD7834/
AD7835
–15V
V
SS
14
REF
REF
REF
REF
REF
+5V
V
= 10 V/16384 = 610 μV.
AGND
DGND
CC
1
V
1, 2
(16383/16384) V
(8193/16384) V
(8192/16384) V
(8191/16384) V
(1/16384) V
OUT
SIGNAL
OUT
GND
V
(–5V TO +5V)
)
OUT
Rev. D | Page 16 of 28
In Figure 20, full-scale and bipolar zero adjustments are
provided by varying the gain and balance on the AD588. R2
varies the gain on the AD588 while R3 adjusts the offset of both
the +5 V and –5 V outputs together with respect to ground.
For bipolar-zero adjustment, the DAC is loaded with
1000 . . . 0000 and R3 is adjusted until V
is adjusted by loading the DAC with all 1s and adjusting R2
until V
When bipolar zero and full-scale adjustment are not needed, R2
and R3 are omitted. Pin 12 on the AD588 should be connected to
Pin 11, and Pin 5 should be left floating.
OUT
= 5(8191/8192) V = 4.99939 V.
OUT
= 0 V. Full scale