参数资料
| 型号： | AD7248AQ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC DAC 12BIT W/REF 24-CDIP |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 18 |
| 系列： | DACPORT® |
| 设置时间： | 7µs |
| 位数： | 12 |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 电压电源： | 双 ± |
| 功率耗散（最大）： | 210mW |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 24-CDIP（0.300"，7.62mm） |
| 供应商设备封装： | 24-CDIP |
| 包装： | 管件 |
| 输出数目和类型： | 1 电压，单极；1 电压，双极 |
| 采样率（每秒）： | * |
AD7245A/AD7248A
REV. B
–4–
DAC GAIN ERROR
DAC Gain Error is a measure of the output error between an
ideal DAC and the actual device output with all 1s loaded after
offset error has been allowed for. It is, therefore defined as:
Measured Value—Offset—Ideal Value
where the ideal value is calculated relative to the actual refer-
ence value.
UNIPOLAR OFFSET ERROR
Unipolar Offset Error is a combination of the offset errors of the
voltage mode DAC and the output amplifier and is measured
when the part is configured for unipolar outputs. It is present
for all codes and is measured with all 0s in the DAC register.
BIPOLAR ZERO OFFSET ERROR
Bipolar Zero Offset Error is measured when the part is config-
ured for bipolar output and is a combination of errors from the
DAC and output amplifier. It is present for all codes and is
measured with a code of 2048 (decimal) in the DAC register.
SINGLE SUPPLY LINEARITY AND GAIN ERROR
The output amplifier of the AD7245A/AD7248A can have a
true negative offset even when the part is operated from a single
positive power supply. However, because the lower supply rail
to the part is 0 V, the output voltage cannot actually go nega-
tive. Instead the output voltage sits on the lower rail and this
results in the transfer function shown. This is an offset effect
and the transfer function would have followed the dotted line if
the output voltage could have gone negative. Normally, linearity
is measured after offset and full scale have been adjusted or
allowed for. On the AD7245A/AD7248A the negative offset is
allowed for by calculating the linearity from the code which the
amplifier comes off the lower rail. This code is given by the
negative offset specification. For example, the single supply
linearity specification applies between Code 3 and Code 4095
for the 25
°C specification and between Code 5 and Code 4095
over the TMIN to TMAX temperature range. Since gain error is
also measured after offset has been allowed for, it is calculated
between the same codes as the linearity error. Bipolar linearity and
gain error are measured between Code 0 and Code 4095.
0V
NEGATIVE
OFFSET
DAC CODE
OUTPUT
VOLTAGE
TERMINOLOGY
RELATIVE ACCURACY
Relative Accuracy, or endpoint nonlinearity, is a measure of the
actual deviation from a straight line passing through the endpoints
of the DAC transfer function. It is measured after allowing for
zero and full scale and is normally expressed in LSBs or as a
percentage of full-scale reading.
DIFFERENTIAL NONLINEARITY
Differential Nonlinearity is the difference between the measured
change and the ideal 1 LSB change between any two adjacent
codes. A specified differential nonlinearity of
±1 LSB max over
the operating temperature range ensures monotonicity.
DIGITAL FEEDTHROUGH
Digital Feedthrough is the glitch impulse injected from the digital
inputs to the analog output when the inputs change state. It is
measured with
LDAC high and is specified in nV-s.
AD7245A ORDERING GUIDE
Temperature
Relative
Package
Model
1
Range
Accuracy
Option
2
AD7245AAN
–40
°C to +85°C
±3/4 LSB
N-24
AD7245ABN
–40
°C to +85°C
±1/2 LSB
N-24
AD7245AAQ
–40
°C to +85°C
±3/4 LSB
Q-24
AD7245ATQ
3
–55
°C to +125°C
±3/4 LSB
Q-24
AD7245AAP
–40
°C to +85°C
±3/4 LSB
P-28A
AD7245AAR
–40
°C to +85°C
±3/4 LSB
R-24
AD7245ABR
–40
°C to +85°C
±1/2 LSB
R-24
AD7245ATE
3
–55
°C to +125°C
±3/4 LSB
E-28A
NOTES
1To order MIL-STD-883, Class B processed parts, add /883B to part number.
Contact our local sales office for military data sheet and availability.
2E = Leadless Ceramic Chip Carrier; N = Plastic DIP; P = Plastic Leaded Chip
Carrier; Q = Cerdip; R = SOIC.
3This grade will be available to /883B processing only.
AD7248A ORDERING GUIDE
Temperature
Relative
Package
Model
1
Range
Accuracy
Option
2
AD7248AAN
–40
°C to +85°C
±3/4 LSB
N-20
AD7248ABN
–40
°C to +85°C
±1/2 LSB
N-20
AD7248AAQ
–40
°C to +85°C
±3/4 LSB
Q-20
AD7248ATQ
3
–55
°C to +125°C
±3/4 LSB
Q-20
AD7248AAP
–40
°C to +85°C
±3/4 LSB
P-20A
AD7248AAR
–40
°C to +85°C
±3/4 LSB
R-20
AD7248ABR
–40
°C to +85°C
±1/2 LSB
R-20
NOTES
1To order MIL-STD-883, Class B processed parts, add /883B to part number.
Contact our local sales office for military data sheet and availability.
2N = Plastic DIP; P = Plastic Leaded Chip Carrier; Q = Cerdip; R = SOIC.
3This grade will be available to /883B processing only.
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相关代理商/技术参数 |
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| AD7248ASCHIPS | 功能描述:IC DAC 12BIT W/REF 制造商:analog devices inc. 系列:* 零件状态:上次购买时间 标准包装:1 |
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| AD7248ATQ | 制造商:Analog Devices 功能描述:DAC 1CH R-2R 12-BIT 20CDIP - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:12-BIT DACPORT (8+4) IC - Bulk 制造商:Analog Devices 功能描述:IC DAC 12BIT W/REF 24-CDIP 制造商:Analog Devices 功能描述:CONVERTER - DAC |
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