參數(shù)資料
型號： ADS1191IPBSR
廠商： Texas Instruments
文件頁數(shù)： 50/67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)
Device
0.1
F
m
1
F
m
AVDD
0.1
F
m
1
F
m
-1.5 V
AVSS
DGND
DVDD
+1.5 V
+1.8 V
0.1
F
m
1
F
m
VCAP1
VCAP2
0.1
F
m
VREFP
VREFN
10
F
m
1
F
m
-1.5 V
1
F
m
4.7 nF
PGA1N
PGA1P
4.7 nF
PGA2N
PGA2P
SBAS566A – DECEMBER 2011 – REVISED SEPTEMBER 2012
Connecting the Device to Bipolar (±1.5 V/1.8 V) Supplies
Figure 50 illustrates the ADS1191/2 connected to a bipolar supply. In this example, the analog supplies connect
to the device analog supply (AVDD). This supply is referenced to the device analog return (AVSS), and the
digital supply (DVDD) is referenced to the device digital ground return (DGND).
NOTE: Place the capacitors for supply, reference, VCAP1, and VCAP2 as close to the package as possible.
Figure 50. Bipolar Supply Operation
Shielding Analog Signal Paths
As with any precision circuit, careful PCB layout ensures the best performance. It is essential to make short,
direct interconnections and avoid stray wiring capacitance—particularly at the analog input pins and AVSS.
These analog input pins are high-impedance and extremely sensitive to extraneous noise. The AVSS pin should
be treated as a sensitive analog signal and connected directly to the supply ground with proper shielding.
Leakage currents between the PCB traces can exceed the input bias current of the ADS1191/2 if shielding is not
implemented. Digital signals should be kept as far as possible from the analog input signals on the PCB.
54
Copyright 2011–2012, Texas Instruments Incorporated
Product Folder Links: ADS1191 ADS1192
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