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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： | 60/73页 |
| 文件大小： | 957K |
| 代理商： | PADS1298CZXGT |
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PRODUCTPREVIEW
ADS1298
AVDD
0.1 F
m
10 F
m
+3V
AVDD1
AVSS
AVSS1
DGND
DVDD
+1.8V
0.1 F
m
10 F
m
0.1 F
m
VREFP
VREFN
VCAP1
VCAP2
VCAP3
VCAP4
WCT
100pF
1 F
m
1 F
m
1 F
m
10 F
m
22 F
m
www.ti.com
SBAS459C – JANUARY 2010 – REVISED MARCH 2010
GUIDE TO GET UP AND RUNNING
PCB LAYOUT
Power Supplies and Grounding
The ADS1294/6/8 has three supplies: AVDD, AVDD1, and DVDD. Both AVDD and AVDD1 should be as quiet as
possible. AVDD1 provides supply to the charge pump block and has transients at fCLK. So it is recommended that
AVDD1 and AVSS1 be star connected to AVDD and AVSS. It is important to eliminate noise from AVDD and
AVDD1 that is non-synchronous with the ADS1294/6/8 operation; see the EVM layout for star ground connection
example (application report SBAA175, SPI Timing Considerations for the ADS119x/129x Devices). Each supply
of the ADS1294/6/8 should be bypassed with 10mF and a 0.1mF 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 ADS1294/6/8. The ADS1294/6/8 can be
powered from unipolar or bipolar supplies.
Connecting the Device to Unipolar (+3V/+1.8V) Supplies
Figure 47 illustrates the ADS1294/6/8 connected to a unipolar supply. In this example, analog supply (AVDD) is
referenced to analog ground (AVSS) and digital supplies (DVDD) are referenced to digital ground (DGND).
NOTE: Place the capacitors for supply, reference, WCT, and VCAP1 to VCAP4 as close to the package as possible.
Figure 47. Single-Supply Operation
Copyright 2010, Texas Instruments Incorporated
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