參數(shù)資料
型號： ADS1191IPBS
廠商： Texas Instruments
文件頁數(shù)： 49/67頁
文件大?。?/td> 0K
描述： IC AFE 16BIT 8KSPS 1CH 32TQFP
標準包裝： 250
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： 管件
Device
AVDD
0.1
F
m
1
F
m
+3 V
AVSS
DGND
DVDD
+1.8 V
0.1
F
m
1
F
m
0.1
F
m
VREFP
VREFN
VCAP1
VCAP2
1
F
m
10
F
m
1
F
m
4.7 nF
PGA1N
PGA1P
4.7 nF
PGA2N
PGA2P
SBAS566A – DECEMBER 2011 – REVISED SEPTEMBER 2012
QUICK-START GUIDE
PCB LAYOUT
Power Supplies and Grounding
The ADS1191/2 have two supplies: AVDD and DVDD. AVDD should be as quiet as possible. AVDD provides the
supply to the charge pump block and has transients at fCLK. It is important to eliminate noise from AVDD that is
non-synchronous with the ADS1191/2 operation. Each supply of the ADS1191/2 should be bypassed with 10-
μF
and a 0.1-
μF solid ceramic capacitors. It is recommended that placement of the digital circuits (DSP,
microcontrollers, FPGAs, etc.) in the system is done such that the return currents on those devices do not cross
the analog return path of the ADS1191/2. The ADS1191/2 can be powered from unipolar or bipolar supplies.
The capacitors used for decoupling can be of the surface-mount, low-cost, low-profile multi-layer ceramic type. In
most cases the VCAP1 capacitor can also be a multi-layer ceramic, but in systems where the board is subjected
to high or low frequency vibration, it is recommend that a non-ferroelectric capacitor such as a tantalum or class
1 capacitor (for example, C0G or NPO) be installed. EIA class 2 and class 3 dielectrics (such as X7R, X5R, X8R,
etc.) are ferroelectric. The piezoelectric property of these capacitors can appear as electrical noise coming from
the capacitor. When using internal reference, noise on the VCAP1 node results in performance degradation.
Connecting the Device to Unipolar (+3 V/+1.8 V) Supplies
Figure 49 illustrates the ADS1191/2 connected to a unipolar supply. In this example, the analog supply (AVDD) is
referenced to analog ground (AVSS) and the digital supply (DVDD) is referenced to digital ground (DGND).
NOTE: Place the capacitors for supply, reference, VCAP1, and VCAP2 as close to the package as possible.
Figure 49. Single-Supply Operation
Copyright 2011–2012, Texas Instruments Incorporated
53
Product Folder Links: ADS1191 ADS1192
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ADS1191IPBSR 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
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
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