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參數(shù)資料
| 型號： | EVAL-AD5546SDZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR AD5546 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | * |
AD5546/AD5556
Data Sheet
Rev. D | Page 12 of 20
APPLICATIONS INFORMATION
UNIPOLAR MODE
Two-Quadrant Multiplying Mode, VOUT = 0 V to –VREF
The AD5546/AD5556 DAC architecture uses a current-steering
R-2R ladder design that requires an external reference and op
amp to convert the unipolar mode of output voltage to
AD5546
VOUT = –VREF × D/65,536
(1)
AD5556
VOUT = –VREF × D/16,384
(2)
where D is the decimal equivalent of the input code.
The output voltage polarity is opposite to the VREF polarity in
this case (see Figure 19). Table 8 shows the negative output vs.
code for the AD5546.
Table 8. AD5546 Unipolar Mode Negative Output vs. Code
D in Binary
VOUT (V)
1111 1111 1111 1111
–VREF(65,535/65,536)
1000 0000 0000 0000
–VREF/2
0000 0000 0000 0001
–VREF(1/65,536)
0000 0000 0000 0000
0
Two-Quadrant Multiplying Mode, VOUT = 0 V to +VREF
The AD5546/AD5556 are designed to operate with either
positive or negative reference voltages. As a result, positive
output can be achieved with an additional op amp, (see
Figure 20), and the output becomes
AD5546
VOUT = +VREF × D/65,536
(3)
AD5556
VOUT = +VREF × D/16,384
(4)
Table 9 shows the positive output vs. code for the AD5546.
Table 9. AD5546 Unipolar Mode Positive Output vs. Code
D in Binary
VOUT (V)
1111 1111 1111 1111
+VREF(65,535/65,536)
1000 0000 0000 0000
+VREF/2
0000 0000 0000 0001
+VREF(1/65,536)
0000 0000 0000 0000
0
03810-
021
2
+5V
5
4
GND
VIN
TRIM
U3
ADR03
VOUT
VDD
R1
ROFS
VOUT
–2.5V TO 0V
RFB
C6
2.2pF
GND
U1
AD5546/AD5556
IOUT
R2
C4
0.1F
C5
1F
RCOM
R1
16-/14-BIT
DATA
16-/14-BIT
DATA
REF
U2
AD8628
–
+
–5V
WR
LDAC
RS
MSB
C2
0.1F
C1
1F
C3
0.1F
V+
V–
Figure 19. Unipolar Two-Quadrant Multiplying Mode, VOUT = 0 to –VREF
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