±VREF Gain ; = 2V REF Gain AVDD 0.4 - Gain V MAX_DIFF 2 " />
參數(shù)資料
型號： ADS1191IPBSR
廠商： Texas Instruments
文件頁數(shù)： 11/67頁
文件大?。?/td> 0K
描述： IC AFE 16BIT 8KSPS 1CH 32TQFP
標(biāo)準(zhǔn)包裝： 1,000
位數(shù)： 16
通道數(shù)： 1
電壓 - 電源，模擬： 2.7 V ~ 5.25 V
電壓 - 電源，數(shù)字： 1.7 V ~ 3.6 V
封裝/外殼： 32-TQFP
供應(yīng)商設(shè)備封裝： 32-TQFP（5x5）
包裝： 帶卷 (TR)
Max(INP
INN)<
-
V
REF
Gain
Full-ScaleRange=
±VREF
Gain
;
=
2V
REF
Gain
AVDD
0.4
-
Gain V
MAX_DIFF
2
> CM > AVSS + 0.4 +
Gain V
MAX_DIFF
2
SBAS566A – DECEMBER 2011 – REVISED SEPTEMBER 2012
For example, a mismatch of 20 pF with a gain of 6 limits the CMRR to 112 dB. If
ΔCP is small, then the CMRR is
limited by the PGA itself and is as specified in the Electrical Characteristics table. The PGA are chopped
internally at either 8, 32, or 64 kSPS. The digital decimation filter filters out the chopping ripple in the normal path
so the chopping ripple is not a concern. First-order filtering is provided by the RC filter at the PGA output.
Additional filtering may be needed to suppress the chopping ripple. If the PGA output is routed to other circuitry,
a 20-k
Ω series resistance must be added in the path near the CFILTER capacitor. The routing should be matched
to maintain the CMRR performance.
Input Common-Mode Range
The usable input common-mode range of the front end depends on various parameters, including the maximum
differential input signal, supply voltage, PGA gain, etc. This range is described in Equation 3:
where:
VMAX_DIFF = maximum differential signal at the input of the PGA
CM = common-mode range
(3)
For example:
If VDD = 3 V, gain = 6, and VMAX_DIFF = 350 mV
Then 1.25 V < CM < 1.75 V
Input Differential Dynamic Range
The differential (INP – INN) signal range depends on the analog supply and reference used in the system. This
range is shown in Equation 4.
(4)
The 3-V supply, with a reference of 2.42 V and a gain of 6 for ECGs, is optimized for power with a differential
input signal of approximately 300 mV. For higher dynamic range, a 5-V supply with a reference of 4 V (set by the
VREF_4V bit of the CONFIG3 register) can be used to increase the differential dynamic range.
Copyright 2011–2012, Texas Instruments Incorporated
19
Product Folder Links: ADS1191 ADS1192
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ADS1191IRSMR 制造商:Texas Instruments 功能描述:AFE General Purpose 1ADC 24-Bit 1.8V/3V 32-Pin VQFN EP T/R 制造商:Texas Instruments 功能描述:IC AFE 16BIT 8KSPS 1CH 32VQFN 制造商:Texas Instruments 功能描述:Low Pwr Int AFE for ECG App
ADS1191IRSMT 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Cmplt Lw Pwr Intgrtd AFE for ECG apps RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS1192 制造商:TI 制造商全稱:Texas Instruments 功能描述:Low-Power, 2-Channel, 16-Bit Analog Front-End for Biopotential Measurements
ADS1192ECG-FE 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS1192 Demo Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V
ADS1192IPBS 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low Pwr Integ AFE RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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