参数资料
型号: AD7904BRU
厂商: Analog Devices Inc
文件页数: 14/32页
文件大小: 0K
描述: IC ADC 8BIT 4CH 1MSPS 16-TSSOP
标准包装: 96
位数: 8
采样率(每秒): 1M
数据接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
转换器数目: 1
功率耗散(最大): 13.5mW
电压电源: 单电源
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 16-TSSOP
包装: 管件
输入数目和类型: 4 个单端,单极
配用: EVAL-AD79X4CBZ-ND - BOARD EVALUATION FOR AD79X4CBZ
Data Sheet
AD7904/AD7914/AD7924
Rev. C | Page 21 of 32
Digital Inputs
The digital inputs applied to the AD7904/AD7914/AD7924 can
go to 7 V and are not restricted by the AVDD + 0.3 V limit on the
analog inputs.
Because the SCLK, DIN, and CS inputs are not restricted by the
AVDD + 0.3 V limit, power supply sequencing issues are avoided.
If CS, DIN, or SCLK is applied before AVDD, there is no risk of
latch-up as there would be on the analog inputs if a signal
greater than 0.3 V is applied prior to AVDD.
VDRIVE
The AD7904/AD7914/AD7924 also include the VDRIVE feature.
VDRIVE controls the voltage 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 AD7904/AD7914/AD7924 are
operated with a VDD of 5 V, the VDRIVE pin can be powered
from a 3 V supply. The AD7904/AD7914/AD7924 have better
dynamic performance with a VDD of 5 V while still being able to
interface to 3 V processors. Care should be taken to ensure that
VDRIVE does not exceed AVDD by more than 0.3 V (see the
Reference
An external reference source should be used to supply the 2.5 V
reference to the AD7904/AD7914/AD7924. Errors in the refer-
ence source result in gain errors in the AD7904/AD7914/
AD7924 transfer function and add to the specified full-scale
errors of the part. A capacitor of at least 0.1 F should be placed
on the REFIN pin. Suitable reference sources for the AD7904/
AD7914/AD7924 include the AD780, REF193, and 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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