參數資料
型號: ADS1191IPBSR
廠商: Texas Instruments
文件頁數: 15/67頁
文件大?。?/td> 0K
描述: IC AFE 16BIT 8KSPS 1CH 32TQFP
標準包裝: 1,000
位數: 16
通道數: 1
電壓 - 電源,模擬: 2.7 V ~ 5.25 V
電壓 - 電源,數字: 1.7 V ~ 3.6 V
封裝/外殼: 32-TQFP
供應商設備封裝: 32-TQFP(5x5)
包裝: 帶卷 (TR)
1 F
m
To ADC Reference Inputs
VCAP1
10 F
m
VREFP
VREFN
Bandgap
2.42 V or
4.033 V
AVSS
R
1
(1)
R
3
(1)
R
2
(1)
0.1 F
m
10
30
50
70
90
110
130
-
Normalized Frequency (f /f
)
IN MOD
Gain
(dB)
0.5
0
4
1
1.5
2
2.5
3
3.5
DR[0:2] = 000
DR[0:2] = 110
SBAS566A – DECEMBER 2011 – REVISED SEPTEMBER 2012
Figure 25. Transfer Function of On-Chip Decimation Filters
Until 4fMOD for DR[0:2] = 000 and DR[0:2] = 110
REFERENCE
Figure 26 shows a simplified block diagram of the internal reference of the ADS1191/2. The reference voltage is
generated with respect to AVSS. The VREFN pin must always be connected to AVSS.
(1) For VREF = 2.42 V: R1 = 100 kΩ, R2 = 200 kΩ, and R3 = 200 kΩ. For VREF = 4.033 V: R1 = 84 kΩ, R2 = 120 kΩ, and R3 = 280 kΩ.
Figure 26. Internal Reference
The external band-limiting capacitors determine the amount of reference noise contribution. For high-end ECG
systems, the capacitor values should be chosen such that the bandwidth is limited to less than 10 Hz, so that the
reference noise does not dominate the system noise. When using a 3-V analog supply, the internal reference
must be set to 2.42 V. In case of a 5-V analog supply, the internal reference can be set to 4.033 V by setting the
VREF_4V bit in the CONFIG2 register.
Alternatively, the internal reference buffer can be powered down and VREFP can be applied externally. Figure 27
shows a typical external reference drive circuitry. Power-down is controlled by the PD_REFBUF bit in the
CONFIG3 register. This power-down is also used to share internal references when two devices are cascaded.
By default, the device wakes up in external reference mode.
22
Copyright 2011–2012, Texas Instruments Incorporated
Product Folder Links: ADS1191 ADS1192
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