參數(shù)資料
型號： DAC7731E1K
英文描述： 16-Bit, Voltage Output, Serial Input DIGITAL-TO-ANALOG CONVERTER
中文描述： 16位，電壓輸出，串行輸入數(shù)字到模擬轉(zhuǎn)換器
文件頁數(shù)： 15/19頁
文件大?。?/td> 360K
代理商： DAC7731E1K
DAC7731
SBAS249
15
www.ti.com
V
CC
REF
OUT
REF
IN
REFADJ
V
REF
R
OFFSET
AGND
RFB2
RFB1
SJ
V
OUT
V
DD
V
SS
REFEN
RSTSEL
SCLK
CS
SDO
SDI
LDAC
RST
NC
TEST
DGND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
DAC7731
100k
1.0
μ
F
(Other connections omitted for clarity.)
Low-Pass Reference Filter
FIGURE 14. Filtering the Internal Reference.
Figure 12 illustrates the typical minimum offset adjustment
ranges provided by forcing a current at SJ for a given output
voltage configuration.
OUTPUT
CONFIGURATION
R
POT2
R
1
R
S
I
NOMINAL
OFFSET
ADJUSTMENT
±
25mV
±
55mV
±
21mV
RANGE
0V to +10V
–
10V to +10V
–
5V to +5V
10K
10K
10K
0
2.5M
1.5M
1M
±
2
μ
A
±
2.2
μ
A
±
1.7
μ
A
5K
20K
TABLE V. Recommended External Component Values for
Symmetrical Offset Adjustment (V
REF
= 10V).
OFFSET ADJUST RANGE
–
10V to +10V V
OUT
Configuration
min (75% of typ)
min (75% of typ)
typ
typ
50
25
0
–
25
–
50
O
O
–
2
2
0
–
1
1
I
SJ
(
μ
A)
0V to 10V and
–
5V to +5V
V
OUT
Configuration
FIGURE 12. Offset Adjustment Transfer Characteristic.
GAIN ADJUSTMENT
When using the internal reference of the DAC7731, gain
adjustment is performed by adjusting the device
’
s internal
reference voltage via the reference adjust pin, REFADJ. The
effect of a reference voltage change on the gain of the DAC
output can be seen in the generic equation (for unipolar
configuration):
V
OUT
= V
REFIN
(N/65536)
Where N is represented in decimal format and ranges from
0 to 65535.
REFADJ can be driven by a low impedance voltage source
such as a unipolar, 0V to +10V DAC or a potentiometer (less
than 100k
), see Figure 11. Since the input impedance of
REFADJ is typically 50k
, the smaller the resistance of the
potentiometer, the more linear the adjustment will be. A 10k
potentiometer is suggested if linearity of the reference adjust-
ment is of concern.
When the DAC7731
’
s internal reference is not used, gain
adjustments can be made via trimming the external refer-
ence applied to the DAC at REF
IN
. This can be accomplished
through using a potentiometer, unipolar DAC, or other means
of precision voltage adjustment to control the voltage pre-
sented to the DAC7731 by the external reference. Figure 13
and Table VI summarize the range of adjustment of the
internal reference via REFADJ.
REF
OUT
ADJUST RANGE
40
30
20
10
0
–
10
–
20
–
30
–
40
R
O
0
2
4
6
8
10
REFADJ (V)
Typical REF
Adjustment Range
Minimum REF
Adjustment Range
FIGURE 13. Internal Reference Adjustment Transfer Charac-
teristic.
VOLTAGE AT REFADJ
REFADJ = 0V
REFADJ = 5V or NC
(1)
REFADJ = 10V
REF
OUT
VOLTAGE
10V + 25mV (min)
10V
10V
–
25mV (max)
NOTE: "NC" is "Not Connected"
TABLE VI. Minimum Internal Reference Adjustment Range.
NOISE PERFORMANCE
Increased noise performance of the DAC output can be
achieved by filtering the voltage reference input to the DAC7731.
Figure 14 shows a typical internal reference filter schematic. A
low-pass filter applied between the REF
OUT
and REF
IN
pins can
increase noise immunity at the DAC and output amplifier. The
REF
OUT
pin can source a maximum of 50
μ
A so care should be
taken in order to avoid overloading the internal reference output.
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