参数资料
型号: ADS1298RIZXGT
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: 69/87页
文件大小: 1430K
代理商: ADS1298RIZXGT
GPIO3
GPIO4
GPIO2
t
BLKDLY
(DemodulationClock)
(Blocki g
n Si n l)
g a
t
PHASE
(ModulationCl ck)
o
Respiration
Modulation
Generator
RESP_PH[2:0]
CLK
(2.048MHz)
ModulationClock
DemodulationClock
GPIO4
GPIO3
GPIO2
SBAS459H
– JANUARY 2010 – REVISED MAY 2011
External Respiration Circuitry Option (RESP_CTRL = 01b)
In this mode, GPIO2, GPIO3, and GPIO4 are automatically configured as outputs. The phase relationship
between the signals is shown in Figure 65. GPIO2 is the exclusive-OR of GPIO3 and GPIO4, as shown in
Figure 66. GPIO3 is the modulation signal, and GPIO4 is the de-modulation signal. While in this mode, the
general-purpose pin function of GPIO2, GPIO3, and GPIO4 is not available. The modulation frequency can be
64kHz or 32kHz using RESP_FREQ[2:0] bits in the CONFIG4 register. The remaining bit options of
RESP_FREQ[2:0] generate square waves on GPIO3 and GPIO4. The exclusive-OR out on GPIO2 is only
available on 64kHz and 32kHz modes. The phase of GPIO4, relative to GPIO3, is set by RESP_PH[2:0] bits in
the RESP register.
The mode can be used when the user implements custom respiration impedance circuitry external to the
ADS129x.
Figure 65. External Respiration (RESP_CTRL = 01b) Timing Diagram
Table 15. Timing Characteristics for Figure 65(1)
2.7V
≤ DVDD ≤ 3.6V
1.65V
≤ DVDD ≤ 2V
PARAMET
ER
DESCRIPTION
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
Respiration phase delay, set by
tPHASE
22.5
157.5
22.5
157.5
Degrees
RESP.RESP_PH[2:0] bits
Modulation clock rising edge to XOR
tBLKDLY
1
5
ns
signal
(1)
Specifications apply from
–40°C to +85°C.
Figure 66. External Respiration (RESP_CTRL = 01b) Block Diagram
Copyright
2010–2011, Texas Instruments Incorporated
71
相关PDF资料
PDF描述
ADSP-1401TN/883B 16-BIT, MICROPROGRAM SEQUENCER, PDIP48
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ADSP-21365YSWZ-2BA 16-BIT, 55.55 MHz, OTHER DSP, PQFP144
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