VDRIVE The AD7927 also has the V
參數(shù)資料
型號: AD7927BRU
廠商: Analog Devices Inc
文件頁數(shù): 10/28頁
文件大?。?/td> 0K
描述: IC ADC 12BIT 8CH 200KSPS 20TSSOP
標準包裝: 75
位數(shù): 12
采樣率(每秒): 200k
數(shù)據(jù)接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
轉換器數(shù)目: 1
功率耗散(最大): 7.5mW
電壓電源: 單電源
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 20-TSSOP(0.173",4.40mm 寬)
供應商設備封裝: 20-TSSOP
包裝: 管件
輸入數(shù)目和類型: 8 個單端,單極
配用: EVAL-AD7927CBZ-ND - BOARD EVALUATION FOR AD7927
AD7927
Data Sheet
Rev. D | Page 18 of 28
VDRIVE
The AD7927 also has the VDRIVE feature. VDRIVE controls the volt-
age at which the serial interface operates. VDRIVE allows the ADC
to easily interface to both 3 V and 5 V processors. For example,
if the AD7927 were operated with an AVDD of 5 V, the VDRIVE pin
could be powered from a 3 V supply. The AD7927 has a larger
dynamic range with an AVDD of 5 V while still being able to
interface to 3 V processors. Take care to ensure VDRIVE does not
exceed AVDD by more than 0.3 V (see the Absolute Maximum
Ratings section).
THE REFERENCE
An external reference source should be used to supply the
2.5 V reference to the AD7927. Errors in the reference source
result in gain errors in the AD7927 transfer function and add
to the specified full-scale errors of the part. A capacitor of at
least 0.1 μF should be placed on the REFIN pin. Suitable refer-
ence sources for the AD7927 include the AD780, REF192, and
the AD1582.
If 2.5 V is applied to the REFIN pin, the analog input range can
be either 0 V to 2.5 V or 0 V to 5 V, depending on the setting of
the RANGE bit in the control register.
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