参数资料
型号: AD5542ABRUZ
厂商: Analog Devices Inc
文件页数: 8/24页
文件大小: 0K
描述: IC DAC 16BIT SRL 16TSSOP
设计资源: High Precision Digital-to-Analog Conversion Using the 16-Bit AD5542/1, ADR421, and AD8628 (CN0079)
How to Achieve High Precision Voltage Level Setting Using AD5541A/42A (CN0169)
标准包装: 1
系列: nanoDAC™
设置时间: 1µs
位数: 16
数据接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
转换器数目: 1
电压电源: 单电源
功率耗散(最大): 825µW
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 16-TSSOP
包装: 管件
输出数目和类型: *
采样率(每秒): *
AD5512A/AD5542A
Rev. A | Page 16 of 24
Assuming a perfect reference, the unipolar worst-case output
voltage can be calculated from the following equation:
(
)
INL
V
D
V
ZSE
GE
REF
N
UNI
OUT
+
×
=
2
where:
VOUTUNI is the unipolar mode worst-case output.
D is the code loaded to DAC.
N is the resolution of the DAC.
VREF is the reference voltage applied to the part.
VGE is the gain error in volts.
VZSE is the zero-scale error in volts.
INL is the integral nonlinearity in volts.
BIPOLAR OUTPUT OPERATION
With the aid of an external op amp, the AD5512A/AD5542A
can be configured to provide a bipolar voltage output. A typical
circuit is shown in Figure 32. The matched bipolar offset resistors,
RFB and RINV, are connected to an external op amp to achieve
this bipolar output swing, typically RFB = RINV = 28 k. Table 10
shows the transfer function for this output operating mode.
Also provided on the AD5542A are a set of Kelvin connections
to the analog ground inputs. The example includes the ADR421
2.5 V reference and the AD8628 low offset and zero-drift
reference buffer.
Table 10. AD5542A Bipolar Code Table
DAC Latch Contents
MSB
LSB
Analog Output
1111 1111 1111 1111
+V
REF × (32,767/32,768)
1000 0000 0000 0001
+V
REF × (1/32,768)
1000 0000 0000 0000
0 V
0111 1111 1111 1111
V
REF × (1/32,768)
0000 0000 0000 0000
V
REF × (32,768/32,768) = VREF
Assuming a perfect reference, the worst-case bipolar output
voltage can be calculated from the following equation:
A
RD
V
RD
V
REF
OS
UNI
OUT
BIP
OUT
)
2
(
1
)]
1
(
)
2
)(
[(
+
+
=
where:
VOUTBIP is the bipolar mode worst-case output
VOUTUNI is the unipolar mode worst-case output.
VOS is the external op amp input offset voltage.
RD is the RFB and RINV resistor matching error.
A is the op amp open-loop gain.
VOUT
REFS
REFF
INV
RFB
RINV
DGND AGNDF
VDD
DIN
SCLK
LDAC
CS
AD5512A/
AD5542A
AGNDS
+
0.1F
10F
BIPOLAR
OUTPUT
EXTERNAL
OP AMP
+2.5V
+5V
–5V
SERIAL
INTERFACE
RFB
09199-
024
Figure 32. Bipolar Output
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