參數(shù)資料
型號: AD7225LRZ-REEL
廠商: Analog Devices Inc
文件頁數(shù): 7/24頁
文件大小: 0K
描述: IC DAC 8BIT QUAD W/AMP 24SOIC
產(chǎn)品培訓(xùn)模塊: Data Converter Fundamentals
DAC Architectures
標準包裝: 1,000
設(shè)置時間: 4µs
位數(shù): 8
轉(zhuǎn)換器數(shù)目: 4
電壓電源: 雙 ±
功率耗散(最大): 500mW
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 24-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 24-SOIC W
包裝: 帶卷 (TR)
輸出數(shù)目和類型: 4 電壓,單極;4 電壓,雙極
采樣率(每秒): 200k
AD7225
Rev. C | Page 15 of 24
AGND BIAS
The AD7225 AGND pin can be biased above system ground
(AD7225 DGND) to provide an offset zero analog output
voltage level. Figure 18 shows a circuit configuration to achieve
this for DAC Channel A of the AD7225. The output voltage,
VOUTA, can be expressed as:
VOUTA = VBIAS + DA(VIN)
where DA is a fractional representation of the digital word in
DAC Latch A (0 ≤ DA ≤ 255/256).
VDD
VSS
AGND
VBIAS
VIN
DGND
VOUTA
DAC A
AD7225*
VREFA
*DIGITAL INPUTS OMITTED FOR CLARITY.
00986-
018
Figure 18. AGND Bias Circuit
For a given VIN, increasing AGND above system ground reduces
the effective VDD VREF, which must be at least 4 V to ensure
specified operation. Note that, because the AGND pin is
common to all four DACs, this method biases up the output
voltages of all the DACs in the AD7225. Note that VDD and VSS
of the AD7225 should be referenced to DGND.
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