参数资料
型号: AD5547CRUZ-REEL7
厂商: Analog Devices Inc
文件页数: 6/20页
文件大小: 0K
描述: IC DAC 16BIT PAR DUAL 38TSSOP
设计资源: Precision, Unipolar, Inverting Conversion Using AD5547/57 DAC (CN0026)
Precision, Unipolar, Noninverting Configuration for the AD5547/57 DAC (CN0027)
Precision, Bipolar, Configuration for AD5547/AD5557 DAC (CN0028)
标准包装: 1,000
设置时间: 500ns
位数: 16
数据接口: 并联
转换器数目: 2
电压电源: 单电源
功率耗散(最大): 55µW
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 38-TFSOP(0.173",4.40mm 宽)
供应商设备封装: 38-TSSOP
包装: 带卷 (TR)
输出数目和类型: 2 电流,单极;2 电流,双极
采样率(每秒): 2M
AD5547/AD5557
Data Sheet
Rev. D | Page 14 of 20
APPLICATIONS INFORMATION
UNIPOLAR MODE
2-Quadrant Multiplying Mode, VOUT = 0 V to –VREF
The AD5547/AD5557 DAC architecture uses a current-steering
R-2R ladder design that requires an external reference and op
amp to convert the unipolar mode of the output voltage to
VOUT = VREF × D/65,536 (AD5547)
(1)
VOUT = VREF × D/16,384 (AD5557)
(2)
where D is the decimal equivalent of the input code.
In this case, the output voltage polarity is opposite the VREF
polarity (see Figure 21). Table 7 shows the negative output vs.
code for the AD5547.
Table 7. AD5547 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
WR
RS
2
LDAC
+2.5V
04452-
007
AD8628
AD5547/AD5557
R1A
16/14 DATA
VDD
RCOMA
R2
U1
R1
ROFSA
RFBA
C6
RFB
ROFS
MSB A0, A1
IOUTA
AGNDA
6.8pF
C1
1F
C2
0.1F
C3
0.1F
VOUTA
VREFA
MSB
A0, A1
LDAC
+V
–V
GND
4
VOUT
TRIM
ADR03
5
6
VIN
U3
2
+5V
16-/14-BIT
2.5V
C4
1F
0.1F
C5
–5V
–2.5V TO 0V
Figure 21. Unipolar 2-Quadrant Multiplying Mode, VOUT = 0 to –VREF
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