參數(shù)資料
型號(hào): AD5546
廠商: Analog Devices, Inc.
元件分類: DAC
英文描述: Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors
中文描述: 電流輸出,并行輸入,16-/14-Bit乘法數(shù)模轉(zhuǎn)換器4象限電阻
文件頁數(shù): 13/16頁
文件大?。?/td> 683K
代理商: AD5546
AD5546/AD5556
APPLICATIONS
UNIPOLAR MODE
2-Quadrant Multiplying Mode, V
OUT
= 0 V to –V
REF
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
Rev. 0 | Page 13 of 16
V
OUT
= –V
REF
× D/65,536
(AD5546)
(1)
V
OUT
= –V
REF
× D/16,384
(AD5556)
(2)
where D is the decimal equivalent of the input code.
The output voltage polarity is opposite to the V
REF
polarity in
this case (see Figure 21). Table 8 shows the negative output
versus code for the AD5546.
Table 8. AD5546 Unipolar Mode Negative Output vs. Code
D in Binary
V
OUT
(V)
1111 1111 1111 1111
–V
REF
(65,535/65,536)
1000 0000 0000 0000
–V
REF
/2
0000 0000 0000 0001
–V
REF
(1/65,536)
0000 0000 0000 0000
0
2-Quadrant Multiplying Mode, V
OUT
= 0 V to +V
REF
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 22), and the output becomes
V
OUT
= +V
REF
× D/65,536
(AD5546)
(3)
V
OUT
= +V
REF
× D/16,384
(AD5556)
(4)
Table 9 shows the positive output versus code for the AD5546.
Table 9. AD5546 Unipolar Mode Positive Output vs. Code
D in Binary
V
OUT
(V)
1111 1111 1111 1111
+V
REF
(65,535/65,536)
1000 0000 0000 0000
+V
REF
/2
0000 0000 0000 0001
+V
REF
(1/65,536)
0000 0000 0000 0000
0
0
16/14-BIT
2
+5V
5
4
GND
VIN
TRIM
U3
ADR03
VOUT
VDD
R1
ROFS
ROFS
VOUT
–2.5V TO 0V
RFB
RFB
C6
2.2pF
GND
U1
AD5546/AD5556
IOUT
R2
C4
0.1
μ
F
C5
1
μ
F
RCOM
R1
16/14 DATA
REF
U2
AD8628
V–
+
–5V
WR
WR
LDAC
LDAC
RS
RS
MSB
MSB
C2
0.1
μ
F
C1
1
μ
F
C3
0.1
μ
F
V+
Figure 21. Unipolar 2-Quadrant Multiplying Mode, V
OUT
= 0 to –V
REF
相關(guān)PDF資料
PDF描述
AD5546BRU Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors
AD5546BRU-REEL7 Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors
AD5556CRU Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors
AD5556CRU-REEL7 Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors
AD5556 Dual 8-,10-,12-Bit High Bandwidth Multiplying DACs with Serial Interface
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