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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： | 9/73页 |
| 文件大小： | 957K |
| 代理商： | PADS1298CZXGT |
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PRODUCTPREVIEW
MUX[2:0]=101
TempP
MUX[2:0]= 100
MvddP
(1)
MUX[2:0]= 011
FromLoffP
MUX[2:0]= 000
MUX[2:0]= 110
MUX[2:0]= 001
ToPgaP
ToPgaN
MUX[2:0]= 001
RLDIN
MUX[2:0]= 010
RLD_MEAS
AND
MUX[2:0]= 111
VINP
VINN
MUX[2:0]= 000
FromLoffN
RLD_REF
MUX[2:0]= 010
RLD_MEAS
AND
MvddN
(1)
TempN
MUX[2:0]= 100
MUX[2:0]= 101
ADS129x
MUX
TestP
TestN
TESTP_PACE_OUT1
INT_TEST
TESTN_PACE_OUT2
INT_TEST
MUX[2:0]= 011
EMI
Filter
(AVDD+AVSS)
2
www.ti.com
SBAS459C – JANUARY 2010 – REVISED MARCH 2010
THEORY OF OPERATION
This section contains details of the ADS1294/6/8 internal functional elements. The analog blocks are discussed
first followed by the digital interface. Blocks implementing ECG-specific functions are covered in the end.
Throughout this document, fCLK denotes the frequency of the signal at the CLK pin, tCLK denotes the period of the
signal at the CLK pin, fDR denotes the output data rate, tDR denotes the time period of the output data, and fMOD
denotes the frequency at which the modulator samples the input.
EMI FILTER
An RC filter at the input acts as an EMI filter on all of the channels. The –3dB filter bandwidth is approximately
3MHz.
INPUT MULTIPLEXER
The ADS1294/6/8 input multiplexers are very flexible and provide many configurable signal switching options.
Figure 10 shows the multiplexer on a single channel of the device. Note that the device has eight such blocks,
one for each channel. TEST_PACE_OUT1, TEST_PACE_OUT2, and RLD_IN are common to all eight blocks.
VINP and VINN are separate for each of the eight blocks. This flexibility allows for significant device and
sub-system diagnostics, calibration and configuration. Selection of switch settings for each channel is made by
writing the appropriate values to the CHnSET[2:0] register (see the CHnSET: Individual Channel Settings section
for details) and by writing the RLD_MEAS bit in the CONFIG3 register (see the CONFIG3: Configuration Register
3 subsection of the Register Map section for details). More details of the ECG-specific features of the multiplexer
are discussed in the Input Multiplexer subsection of the ECG-Specifc Functions section.
(1)
MVDD monitor voltage supply depends on channel number; see the Supply Measurements (MVDDP, MVDDN)
section.
Figure 10. Input Multiplexer Block for One Channel
Copyright 2010, Texas Instruments Incorporated
17
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