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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： | 16/73页 |
| 文件大小： | 957K |
| 代理商： | PADS1298CZXGT |
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PRODUCTPREVIEW
22 F
m
ToADCReferenceInputs
VCAP1
10 F
m
VREFP
VREFN
Bandgap
2.4Vor4V
AVSS
R1
(1)
R3
(1)
R2
(1)
100W
100kW
100W
OPA211
10pF
0.1 F
m
+5V
0.1 F
m
10 F
m
100 F
m
22 F
m
OUT
VIN
+5V
TRIM
22 F
m
REF5025
ToVREFPPin
www.ti.com
SBAS459C – JANUARY 2010 – REVISED MARCH 2010
REFERENCE
Figure 19 shows a simplified block diagram of the internal reference of the ADS1294/6/8. The reference voltage
is generated with respect to AVSS. When using the internal voltage reference, connect VREFN to AVSS.
(1) For VREF = 2.4V: R1 = 12.5kΩ, R2 = 25kΩ, and R3 = 25kΩ. For VREF = 4V: R1 = 12.5kΩ, R2 = 15kΩ, and R3 = 35kΩ.
Figure 19. 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 10Hz, so that the
reference noise does not dominate the system noise. When using a 3V analog supply, the internal reference
must be set to 2.4V. In case of a 5V analog supply, the internal reference can be set to 4V 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 20
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.
Figure 20. External Reference Driver
Copyright 2010, Texas Instruments Incorporated
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