參數資料
型號: AD7303BN
廠商: Analog Devices Inc
文件頁數: 12/16頁
文件大小: 0K
描述: IC DAC 8BIT DUAL R-R 8-DIP
產品培訓模塊: Data Converter Fundamentals
DAC Architectures
產品變化通告: Product Discontinuance 27/Oct/2011
標準包裝: 50
設置時間: 1.2µs
位數: 8
數據接口: 串行
轉換器數目: 2
電壓電源: 單電源
功率耗散(最大): 6.93mW
工作溫度: -40°C ~ 105°C
安裝類型: 通孔
封裝/外殼: 8-DIP(0.300",7.62mm)
供應商設備封裝: 8-PDIP
包裝: 管件
輸出數目和類型: 2 電壓,單極;2 電壓,雙極
采樣率(每秒): 833k
AD7303
–5–
REV. 0
TERMINOLOGY
INTEGRAL NONLINEARITY
For the DACs, relative accuracy or endpoint nonlinearity is a
measure of the maximum deviation, in LSBs, from a straight
line passing through the endpoints of the DAC transfer func-
tion. A graphical representation of the transfer curve is shown
in Figure 15.
DIFFERENTIAL NONLINEARITY
Differential nonlinearity is the difference between the measured
change and the ideal 1 LSB change of any two adjacent codes. A
specified differential nonlinearity of
±1 LSB maximum ensures
monotonicity.
ZERO CODE ERROR
Zero code error is the measured output voltage from VOUT of
either DAC when zero code (all zeros) is loaded to the DAC
latch. It is due to a combination of the offset errors in the DAC
and output amplifier. Zero-scale error is expressed in LSBs.
GAIN ERROR
This is a measure of the span error of the DAC. It is the devia-
tion in slope of the DAC transfer characteristic from ideal
expressed as a percent of the full-scale value. Gain error is calcu-
lated between Codes 15 and 245.
FULL-SCALE ERROR
Full-Scale Error is a measure of the output error when the DAC
latch is loaded with FF Hex. Full-scale error includes the offset
error.
DIGITAL-TO-ANALOG GLITCH IMPULSE
Digital-to-analog glitch impulse is the impulse injected into the
analog output when the digital inputs change state with the
DAC selected and the software LDAC used to update the DAC.
It is normally specified as the area of the glitch in nV-s and is
measured when the digital input code is changed by 1 LSB at
the major carry transition.
DIGITAL FEEDTHROUGH
Digital feedthrough is a measure of the impulse injected into the
analog output of a DAC from the digital inputs of the same
DAC, but is measured when the DAC is not updated. It is
specified in nV-s and measured with a full-scale code change on
the data bus, i.e., from all 0s to all 1s and vice versa.
DIGITAL CROSSTALK
Digital crosstalk is the glitch impulse transferred to the output
of one converter due to a digital code change to another DAC.
It is specified in nV-s.
ANALOG CROSSTALK
Analog crosstalk is a change in output of any DAC in response
to a change in the output of the other DAC. It is measured in
LSBs.
POWER SUPPLY REJECTION RATIO (PSRR)
This specification indicates how the output of the DAC is
affected by changes in the power supply voltage. Power supply
rejection ratio is quoted in terms of % change in output per %
of change in VDD for full-scale output of the DAC. VDD is varied
± 10%. This specification applies to an external reference only
because the output voltage will track the VDD voltage when in-
ternal reference is selected.
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