參數(shù)資料
型號(hào)： ADS7807P
英文描述： CMOS Quad 2-Input NOR Gate 14-SOIC -55 to 125
中文描述： 低功耗16位采樣CMOS模擬數(shù)字轉(zhuǎn)換器
文件頁(yè)數(shù)： 19/23頁(yè)
文件大?。?/td> 524K
代理商： ADS7807P
ADS7807
SBAS022B
19
www.ti.com
DSP56000 INTERFACING
The DSP56000 serial interface has SPI compatibility mode
with some enhancements. Figure 16 shows an interface
between the ADS7807 and the DSP56000 which is very
FIGURE 16. DSP56000 Interface to the ADS7807.
similar to the QSPI interface seen in Figure 14. As mentioned
in the QSPI section, the DSP56000 must be programmed to
enable the interface when a LOW to HIGH transition on SC1
is observed (
BUSY
going HIGH at the end of conversion).
The DSP56000 can also provide the convert pulse by includ-
ing a monostable multi-vibrator, as seen in Figure 17. The
receive and transmit sections of the interface are decoupled
(asynchronous mode) and the transmit section is set to
generate a word length frame sync every other transmit
frame (frame rate divider set to 2). The prescale modulus
should be set to 3.
The monostable multi-vibrator in this circuit will provide
varying pulse widths for the convert pulse. The pulse width
will be determined by the external R and C values used with
the multi-vibrator. The 74HCT123N data sheet shows that
the pulse width is (0.7) RC. Choosing a pulse width as close
to the minimum value specified in this data sheet will offer the
best performance. See the Starting A Conversion section of
this data sheet for details on the conversion pulse width.
The maximum conversion rate for a 20.48MHz DSP56000 is
exactly 40kHz. Note that this will not be the case for the
ADS7806. See the ADS7806 data sheet (SBAS021A) for
more information.
FIGURE 17. DSP56000 Interface to the ADS7807. Processor Initiates Conversions.
R/C
BUSY
SDATA
DATACLK
CS
EXT/INT
BYTE
ADS7807
SC1
SRD
SCO
DSP56000
SYN = 0 (Asychronous)
GCK = 1 (Gated clock)
SCD1 = 0 (SC1 is an input)
SHFD = 0 (Shift MSB first)
WL1 = 1 WL0 = 0 (Word length = 16 bits)
Convert Pulse
R
EXT1
C
EXT1
Q1
B1
CLR1
A1
R/C
DATACLK
SDATA
CS
EXT/INT
BYTE
ADS7807
74HCT123N
SC2
SC0
SRD
DSP56000
SYN = 0 (Asychronous)
GCK = 1 (Gated clock)
SCD2 = 1 (SC2 is an output)
SHFD = 0 (Shift MSB first)
WL1 = 1 WL0 = 0 (Word length = 16 bits)
R
+5V
C
+5V
相關(guān)PDF資料
PDF描述
ADS7807PB Low-Power 16-Bit Sampling CMOS ANALOG-to-DIGITAL CONVERTER
ADS7808 CMOS Quad 2-Input NOR Gate 14-SO -55 to 125
ADS7808P 12-Bit 10ms Serial CMOS Sampling ANALOG-to-DIGITAL CONVERTER
ADS7808PB 12-Bit 10ms Serial CMOS Sampling ANALOG-to-DIGITAL CONVERTER
ADS7808U CMOS Quad 2-Input NOR Gate 14-TSSOP -55 to 125
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS7807P 制造商:Texas Instruments 功能描述:16BIT ADC SAMPLING 7807 DIP28
ADS7807P 制造商:Texas Instruments 功能描述:IC ADC 16BIT 40KSPS DIP-28 制造商:Texas Instruments 功能描述:IC, ADC, 16BIT, 40KSPS, DIP-28
ADS7807PB 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Power 16-Bit Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS7807PB 制造商:Texas Instruments 功能描述:IC 16BIT ADC SMD 7807 PDIP28
ADS7807PBG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Power 16-Bit Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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