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參數資料
| 型號： | AD7845BR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | LC2MOS Complete 12-Bit Multiplying DAC |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 2.5 us SETTLING TIME, 12-BIT DAC, PDSO24 |
| 封裝： | SOIC-24 |
| 文件頁數： | 7/12頁 |
| 文件大小： | 193K |
| 代理商： | AD7845BR |
AD7845
REV. B
–7–
UNIPOLAR BINARY OPERATION
Figure 13 shows the AD7845 connected for unipolar binary
operation. When V
IN
is an ac signal, the circuit performs
2-quadrant multiplication. The code table for Figure 13 is given
in Table I.
Figure 13. Unipolar Binary Operation
Table I. Unipolar Binary Code Table for AD7845
Binary Number In
DAC Register
Analog Output, V
OUT
MSB
1111
LSB
1111
1111
–V
IN
4095
4096
1000
0000
0000
–V
IN
2048
4096
= –1/2 V
IN
0000
0000
0001
–V
IN
1
4096
0000
0000
0000
0 V
OFFSET AND GAIN ADJUSTMENT FOR FIGURE 13
Zero Offset Adjustment
1. Load DAC with all 0s.
2. Trim R3 until V
OUT
= 0 V.
Gain Adjustment
1. Load DAC with all 1s.
2. Trim R1 so that V
OUT
= –V
IN
4096
4095
.
In fixed reference applications, full scale can also be adjusted by
omitting R1 and R2 and trimming the reference voltage magni-
tude. For high temperature applications, resistors and potenti-
ometers should have a low temperature coefficient.
BIPOLAR OPERATION
(4-QUADRANT MULTIPLICATION)
The recommended circuit for bipolar operation is shown in
Figure 14. Offset binary coding is used.
The offset specification of this circuit is determined by the
matching of internal resistors R
B
and R
C
and by the zero code
offset error of the device. Gain error may be adjusted by varying
the ratio of R1 and R2.
To use this circuit without trimming and keep within the gain
error specifications, resistors R1 and R2 should be ratio
matched to 0.01%.
The code table for Figure 14 is given in Table II.
Figure 14. Bipolar Offset Binary Operation
Table II. Bipolar Code Table for Offset Binary Circuit of
Figure 14
Binary Number In
DAC Register
Analog Output, V
OUT
MSB
1111
LSB
1111
1111
+V
IN
2047
2048
1000
0000
0001
+V
IN
1
2048
1000
0000
0000
0 V
0111
1111
1111
–V
IN
1
2048
0000
0000
0000
–V
IN
2048
2048
= –V
IN
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