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參數資料
| 型號： | TLC3578IPWRG4 |
| 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, TSSOP-24 |
| 文件頁數： | 31/49頁 |
| 文件大小： | 1137K |
| 代理商： | TLC3578IPWRG4 |
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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.
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| TLC3578IPWR | 8-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO24 |
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| TLC2574IPWG4 | 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| TLC3578IDWR | 8-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO24 |
| TLC2574IDW | 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
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