參數(shù)資料
型號： DAC8830IBD
廠商： TEXAS INSTRUMENTS INC
元件分類： DAC
英文描述： SERIAL INPUT LOADING, 1 us SETTLING TIME, 16-BIT DAC, PDSO8
封裝： GREEN, PLASTIC, SOIC-8
文件頁數(shù)： 11/29頁
文件大小： 687K
代理商： DAC8830IBD
www.ti.com
Bipolar Output Operation
0.1
F
V
DD
+5 V
RFB
INV
AGNDF
AGNDS
DAC
DAC Latch
Input
Register
DAC8831
+V
V
SDI
SCLK
LDAC
V
OUT
R
FB
R
INV
V
REF S
V
REF F
S
e
ri
a
l
In
te
rf
a
c
e
a
n
d
C
o
n
tr
o
l
L
o
g
ic
CS
+2.5 V
+
0.1
F
10
F
DGND
V
O = VREF to +VREF
OPA277
OPA704
OPA727
V
OUT_BIP +
V
OUT_UNI ) VOS (2 ) RD) * VREF(1 ) RD)
1 )
2)RD
A
SLAS449D – FEBRUARY 2005 – REVISED SEPTEMBER 2007
With the aid of an external operational amplifier, the DAC8831 may be configured to provide a bipolar voltage
output. A typical circuit of such an operation is shown in Figure 47. The matched bipolar offset resistors RFB and
RINV are connected to an external operational amplifier to achieve this bipolar output swing; typically, RFB = RINV
= 28 k
.
Figure 47. Bipolar Output Mode of DAC8831
Table 2 shows the transfer function for this output operating mode. The DAC8831 also provides a set of Kelvin
connections to the analog ground and external reference inputs.
Table 2. Bipolar Code
DAC LATCH CONTENTS
MSB
LSB
ANALOG OUTPUT
1111 1111 1111 1111
+VREF × (32,767/32,768)
1000 0000 0000 0001
+VREF × (1/32,768)
1000 0000 0000 0000
0 V
0111 1111 1111 1111
–VREF × (1/32,768)
0000 0000 0000 0000
–VREF × (32,768/32,768) = –VREF
Assuming a perfect reference, the worst-case output voltage may be calculated from the following equation:
Bipolar Mode Worst-Case Output
Where:
VOS = External operational amplifier input offset voltage
RD = RFB and RIN resistor matching error
A = Operational amplifier open-loop gain
Copyright 2005–2007, Texas Instruments Incorporated
19
Product Folder Link(s): DAC8830 DAC8831
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