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参数资料
| 型号： | ADS7953SRHBT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 16-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQCC32 |
| 封装： | GREEN, PLASTIC, PQFP-32 |
| 文件页数： | 36/63页 |
| 文件大小： | 1734K |
| 代理商： | ADS7953SRHBT |
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MXO
AINP
Ch0
Chn*
Ch2
Ch1
ADC
HighInput
impedancePGA
(ornoninvertingbuffer
like THS4031)
GPIO
1,2,3
PGA Gain
Control
GPIO0
H/L Alarm
SDI
SCLK
CS
SDO
To
Host
REF
10 F
m
REF5025
o/p
Fromsensors,INA etc.
Sourceimpedancehasvery
littleeffectonperformance.
Referto TypicalCharacteristics
fordetails.
www.ti.com
SLAS605A – JUNE 2008 – REVISED JANUARY 2010
GPIO 1 to 3 are available only in TSSOP packaged devices. QFN device offers 'GPIO 0' only. As a result all
references related to 'GPIO 0' only are valid in case of QFN package devices.
Figure 58. Typical Application Diagram Showing Common Buffer/PGA for all Channels
When the converter samples an input, the voltage difference between AINP and AGND is captured on the
internal capacitor array. The (peak) input current through the analog inputs depends upon a number of factors:
sample rate, input voltage, and source impedance. The current into the ADS79XX charges the internal capacitor
array during the sample period. After this capacitance has been fully charged, there is no further input current.
When the converter goes into hold mode, the input impedance is greater than 1 G
Ω.
Care must be taken regarding the absolute analog input voltage. To maintain linearity of the converter, the Ch0 ..
Chn and AINP inputs should be within the limits specified. Outside of these ranges, converter linearity may not
meet specifications.
Copyright 2008–2010, Texas Instruments Incorporated
41
Product Folder Link(s): ADS7950, ADS7951, ADS7952, ADS7953 ADS7954, ADS7955, ADS7956, ADS7957 ADS7958,
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