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| 型号： | PADS1298CZXGT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PBGA64 |
| 封装： | 8 X 8 MM, LEAD FREE, PLASTIC, NFBGA-64 |
| 文件页数： | 61/73页 |
| 文件大小： | 957K |
| 代理商： | PADS1298CZXGT |
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PRODUCTPREVIEW
ADS1298
0.1 F
m
10 F
m
AVDD
AVDD1
0.1 F
m
10 F
m
-
1.5V
AVSS
AVSS1
DGND
DVDD
+1.5V
+1.8V
0.1 F
m
10 F
m
VCAP1
VCAP2
VCAP3
0.1 F
m
VREFP
VREFN
10 F
m
VCAP4
WCT
1 F
m
1 F
m
100pF
1 F
m
-
1.5V
22 F
m
SBAS459C – JANUARY 2010 – REVISED MARCH 2010
www.ti.com
Connecting the Device to Bipolar (±1.5V/1.8V) Supplies
Figure 48 illustrates the ADS1294/6/8 connected to a bipolar supply. In this example, the analog supplies
connect to the device analog supply (AVDD). This is referenced to the device analog return (AVSS) and 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 48. 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
ADS1294/6/8 if shielding is not implemented. Digital signals should be kept as far as possible from the analog
input signals on the PCB.
64
Copyright 2010, Texas Instruments Incorporated
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