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参数资料
| 型号： | AD5542ARZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 4/20页 |
| 文件大小： | 0K |
| 描述： | IC DAC 16BIT SRL IN/VOUT 14-SOIC |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 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： | 1,000 |
| 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： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOICN |
| 包装： | 带卷 (TR) |
| 输出数目和类型： | 1 电压，单极；1 电压，双极 |
| 采样率（每秒）： | 1.5M |
AD5541/AD5542
Data Sheet
Rev. F | Page 12 of 20
Assuming a perfect reference, the unipolar worst-case output
voltage can be calculated from the following equation:
VOUT-UNI
(
)
INL
V
D
ZSE
GE
REF
+
×
=
16
2
where:
VOUTUNI is unipolar mode worst-case output.
D is code loaded to DAC.
VREF is reference voltage applied to the part.
VGE is gain error in volts.
VZSE is zero scale error in volts.
INL is integral nonlinearity in volts.
BIPOLAR OUTPUT OPERATION
With the aid of an external op amp, the AD5542 can be confi-
gured to provide a bipolar voltage output. A typical circuit of
such operation is shown in Figure 24. 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 8 shows the transfer function for this output
operating mode. Also provided on the AD5542 are a set of
Kelvin connections to the analog ground inputs.
07557-
024
OUT
REFS
REFF
INV
RFB
RINV
DGND AGNDF
VDD
DIN
SCLK
LDAC
CS
AD5541/AD5542
AGNDS
+
0.1F
10F
UNIPOLAR
OUTPUT
EXTERNAL
OP AMP
+2.5V
+5V
–5V
SERIAL
INTERFACE
RFB
Figure 24. Bipolar Output (AD5542 Only)
Table 8. 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:
VOUT-BIP
(
)(
)
(
)
[
]
(
)
A
RD
V
RD
V
REF
OS
UNI
OUT
+
+
=
2
1
2
where:
VOUT-BIPis 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.
OUTPUT AMPLIFIER SELECTION
For bipolar mode, a precision amplifier should be used and
supplied from a dual power supply. This provides the ±VREF
output. In a single-supply application, selection of a suitable op
amp may be more difficult as the output swing of the amplifier
does not usually include the negative rail, in this case, AGND.
This can result in some degradation of the specified performance
unless the application does not use codes near zero.
The selected op amp needs to have a very low-offset voltage (the
DAC LSB is 38 μV with a 2.5 V reference) to eliminate the need
for output offset trims. Input bias current should also be very
low because the bias current, multiplied by the DAC output
impedance (approximately 6 kΩ), adds to the zero code error.
Rail-to-rail input and output performance is required. For fast
settling, the slew rate of the op amp should not impede the
settling time of the DAC. Output impedance of the DAC is
constant and code-independent, but to minimize gain errors,
the input impedance of the output amplifier should be as high
as possible. The amplifier should also have a 3 dB bandwidth of
1 MHz or greater. The amplifier adds another time constant to
the system, hence increasing the settling time of the output. A
higher 3 dB amplifier bandwidth results in a shorter effective
settling time of the combined DAC and amplifier.
FORCE SENSE AMPLIFIER SELECTION
Use single-supply, low-noise amplifiers. A low-output impedance
at high frequencies is preferred because the amplifiers need to
be able to handle dynamic currents of up to ±20 mA.
REFERENCE AND GROUND
Because the input impedance is code-dependent, the reference
pin should be driven from a low impedance source. The AD5541/
AD5542 operate with a voltage reference ranging from 2 V to
VDD. References below 2 V result in reduced accuracy. The full-
scale output voltage of the DAC is determined by the reference.
Table 7 and Table 8 outline the analog output voltage or partic-
ular digital codes. For optimum performance, Kelvin sense
connections are provided on the AD5542.
If the application does not require separate force and sense
lines, tie the lines close to the package to minimize voltage
drops between the package leads and the internal die.
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| AD5542ASRUZ | 制造商:AD 制造商全称:Analog Devices 功能描述:2.7 V to 5.5 V, Serial-Input, Voltage-Output, 16-/12-Bit nanoDACs in LFCSP |
| AD5542BR | 功能描述:IC DAC 16BIT SERIAL-IN 14-SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 产品培训模块:Data Converter Fundamentals DAC Architectures 标准包装:750 系列:- 设置时间:7µs 位数:16 数据接口:并联 转换器数目:1 电压电源:双 ± 功率耗散（最大）:100mW 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-LCC（J 形引线） 供应商设备封装:28-PLCC（11.51x11.51） 包装:带卷 (TR) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:143k |
| AD5542BR-REEL7 | 制造商:Analog Devices 功能描述:DAC 1-CH Segment 16-bit 14-Pin SOIC N T/R |
| AD5542BRZ | 功能描述:IC DAC 16BIT SERIAL IN 14SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 产品培训模块:Data Converter Fundamentals DAC Architectures 标准包装:750 系列:- 设置时间:7µs 位数:16 数据接口:并联 转换器数目:1 电压电源:双 ± 功率耗散（最大）:100mW 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-LCC（J 形引线） 供应商设备封装:28-PLCC（11.51x11.51） 包装:带卷 (TR) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:143k |
| AD5542BRZ-REEL7 | 功能描述:IC DAC 16BIT SERIAL IN 14SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 产品培训模块:Data Converter Fundamentals DAC Architectures 标准包装:750 系列:- 设置时间:7µs 位数:16 数据接口:并联 转换器数目:1 电压电源:双 ± 功率耗散（最大）:100mW 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-LCC（J 形引线） 供应商设备封装:28-PLCC（11.51x11.51） 包装:带卷 (TR) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:143k |
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