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參數(shù)資料
| 型號： | DAC8832IRGY |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 16-Bit, Ultra-Low Power, Voltage-Output Digital-to-Analog Converter |
| 中文描述： | 16位，超低功耗，電壓輸出數(shù)字模擬轉換器 |
| 文件頁數(shù)： | 17/26頁 |
| 文件大?。?/td> | 702K |
| 代理商： | DAC8832IRGY |
www.ti.com
APPLICATION INFORMATION
UNIPOLAR OUTPUT OPERATION
The DAC8832 is capable of driving unbuffered loads of 60k
. Unbuffered operation results in low supply current
(typically 5
μ
A) and a low offset error. The DAC8832 can be configured to output both unipolar and bipolar
voltages.
Figure 44
shows a typical unipolar output voltage circuit. The code table for this mode of operation is
shown in
Table 1
.
0.1
μ
F
V
DD
+5 V
RFB
INV
V
OUT
AGNDF
AGNDS
DAC
DAC Latch
Input
Register
DAC8832
+V
V
SDI
SCLK
LDAC
R
FB
R
INV
V
REF
S
V
REF
F
S
a
CS
+2.5 V
+
0.1
μ
F
10
μ
F
DGND
V
O
= 0 to +V
REF
OPA277
OPA704
OPA727
V
OUT_UNI
D
2
16
V
REF
V
GE
V
ZSE
INL
DAC8832
SBAS380A–FEBRUARY 2006–REVISED APRIL 2006
Figure 44. Unipolar Output Mode
Table 1. Unipolar Code
DAC LATCH CONTENTS
MSB
1111 1111 1111 1111
1000 0000 0000 0000
0000 0000 0000 0001
0000 0000 0000 0000
LSB
ANALOG OUTPUT
V
REF
× (65,535/65,536)
V
REF
× (32,768/65,536) = 1/2 V
REF
V
REF
× (1/65,536)
0V
Assuming a perfect reference, the worst-case output voltage may be calculated in the following equation:
Unipolar Mode Worst-Case Output:
Where:
V
OUT_UNI
= Unipolar mode worst-case output
D = Code loaded to DAC
V
REF
= Reference voltage applied to part
V
GE
= Gain error in volts
V
ZSE
= Zero scale error in volts
INL = Integral nonlinearity in volts
17
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