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參數(shù)資料
| 型號： | ADS1194CZXGT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PBGA64 |
| 封裝： | 8 X 8 MM, GREEN, PLASTIC, NFBGA-64 |
| 文件頁數(shù)： | 62/76頁 |
| 文件大?。?/td> | 1193K |
| 代理商： | ADS1194CZXGT |
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ADS1198
0.1 F
m
1 F
m
AVDD
AVDD1
0.1 F
m
1 F
m
-
1.5V
AVSS
AVSS1
DGND
DVDD
+1.5V
+1.8V
0.1 F
m
1 F
m
VCAP1
VCAP2
VCAP3
0.1 F
m
VREFP
VREFN
10 F
m
VCAP4
WCT
1 F
m
1 F
m
1 F
m
-
1.5V
22 F
m
0.1 F
m
100pF
RESV1
5kW
10pF
AVSS
AVDD
INxP,
INxN
SBAS471B
– APRIL 2010 – REVISED APRIL 2011
Connecting the Device to Bipolar (
±1.5V/1.8V) Supplies
Figure 55 illustrates the ADS1194/6/8 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 supplies (DVDD and DVDD) are referenced to the device digital ground return (DVDD).
NOTE: Place the capacitors for supply, reference, WCT, and VCAP1 to VCAP4 as close to the package as possible.
Figure 55. Bipolar Supply Operation
Shielding Analog Signal Paths
As with any precision circuit, careful printed circuit board (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
ADS1194/6/8 if shielding is not implemented. Digital signals should be kept as far as possible from the analog
input signals on the PCB.
Analog Input Structure
The analog input of the ADS119x is shown in Figure 56.
Figure 56. Analog Input Protection Circuit
Copyright
2010–2011, Texas Instruments Incorporated
65
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS1194IPAG | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Low-Power 8-Channel 16-Bit Analog Front-End for Biopotential Measurements |
| ADS1194IPAGR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Low-Power 8-Channel 16-Bit Analog Front-End for Biopotential Measurements |
| ADS1196 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Low-Power, 8-Channel, 24-Bit Analog Front-End for Biopotential Measurements |
| ADS1196CPAG | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Pwr6Ch16B Ana Front-End for ECG 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 |
| ADS1196CPAG | 制造商:Texas Instruments 功能描述:; Resolution (Bits):16bit; Sampling Rate 制造商:Texas Instruments 功能描述:IC, ADC, 6CH, 16BIT, 8KSPS, TQFP-64 |
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