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參數(shù)資料
型號(hào)： TLC3578IDWRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 8-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO24
封裝： GREEN, PLASTIC, SOP-24
文件頁(yè)數(shù)： 31/49頁(yè)
文件大小： 1137K
代理商： TLC3578IDWRG4
TLC3574, TLC3578, TLC2574, TLC2578
5V ANALOG, 3/5V DIGITAL, 14/12BIT, 200KSPS, 4/8CHANNEL
SERIAL ANALOGTODIGITAL CONVERTERS WITH ±10V INPUTS
SLAS262C OCTOBER 2000 REVISED MAY 2003
37
WWW.TI.COM
APPLICATION INFORMATION
interface with host
Figure 32 shows the examples of the interface between a single converter and host DSP (TMS320C54x
DSP)
or microprocessor. The C54x is set as FWID=1 (active pulse width=1CLK); (R/X) DATDLY=1 (1 bit data delay);
CLK(X/R)P=0 (transmit data are clocked out at rising edge of CLK, receive data are sampled on falling edge
of CLK); and FS(X/R)P=1 (FS is active high). If multiple converters connect to the same C54x, use CS as chip
select.
The host microprocessor is set as the SPI master, CPOL=0 (active high clock), and CPHA=1 (transmit data is
clock out at rising edge of CLK, receive data are sampled at falling edge of CLK). 16 bits (or more) per transfer
is required.
FSR
FSX
DX
DR
CLKR
CLKX
IRQ
TMS320C54X
Converter
10 k
VDD
CS
FS
SDI
SDO
SCLK
INT/EOC
Ain
Single Converter Connects to DSP
SS
MOSI
MISO
SCK
IRQ
Host
Microprocessor
Converter
10 k
VDD
CS
FS
SDI
SDO
SCLK
INT/EOC
Converter Connects to Microprocessor
10 k
Ain
Figure 32. Typical Interface to Host DSP and Microprocessor
sampling time analysis
Figure 33 shows the equivalent circuit to evaluate the required sampling time. Req is the Thevenin equivalent
resistor (Req = 3.5 K). The C(sampling) is sampling capacitor (30 pF maximum).
To get 1/4 LSB accuracy, the sampling capacitor, Csampling, has to be charged to
VC = VS ± voltage of 1/4 LSB = VS ± (VS/65532) for 14 bit converter (TLC3574 and TLC3578)
= VS ± (VS/16384) for 12 bit converter (TLC2574 and TLC2578)
During the sampling time t(sampling), C(sampling) is charge to
V
C +
V
S
1–exp
–t
(sampling)
Req
C
(sampling)
Therefore, the required sampling time is
t(sampling) = Req × C(sampling) × In (65532) for 14-bit (TLC3574 and TLC3578)
t(sampling) = Req × C(sampling) × In (16384) for 12-bit (TLC2574 and TLC2578).
TMS320C54x is a trademark of Texas Instruments.
相關(guān)PDF資料
PDF描述
TLC2578IDWR 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO24
TLC3574IPWR 4-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
TLC2574IPWR 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
TLC2574IDWR 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
TLC32070N SPECIALTY ANALOG CIRCUIT, PDIP28
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TLC3578IPW 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Serial Out Low Power 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
TLC3578IPW 制造商:Texas Instruments 功能描述:A/D CONVERTER (A-D) IC
TLC3578IPWG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Serial Out Low Power 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
TLC3578IPWR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Serial Out Low Power 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
TLC3578IPWRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Serial Out Low Power 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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