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TLC2551 Folha de dados(PDF) 3 Page - Texas Instruments

Nome de Peças TLC2551
Descrição Electrónicos  5-V, LOW-POWER, 12-BIT, 175/360 KSPS, SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTOPOWER DOWN
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

TLC2551 Folha de dados(HTML) 3 Page - Texas Instruments

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TLC2551, TLC2552, TLC2555
5-V, LOW-POWER, 12-BIT, 175/360 KSPS,
SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTOPOWER DOWN
SLAS276D – MARCH 2000 – REVISED MAY 2003
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions
TLC2551
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
AIN
4
I
Analog input channel
CS
1
I
Chip select. A high-to-low transition on the CS input removes SDO from 3-state within a maximum setup time.
CS can be used as the FS pin when a dedicated DSP serial port is used.
FS
7
I
DSP frame sync input. Indication of the start of a serial data frame. Tie this terminal to VDD if not used.
GND
3
I
Ground return for the internal circuitry. Unless otherwise noted, all voltage measurements are with respect to GND.
SCLK
5
I
Output serial clock. This terminal receives the serial SCLK from the host processor.
SDO
8
O
The 3-state serial output for the A/D conversion result. SDO is kept in the high-impedance state until CS falling edge
or FS rising edge, whichever occurs first. The output format is MSB first.
When FS is not used (FS = 1 at the falling edge of CS), the MSB is presented to the SDO pin after CS falling edge
and output data is valid on the first falling edge of SCLK.
When CS and FS are both used (FS = 0 at the falling edge of CS), the MSB is presented to the SDO pin after the
falling edge of CS. When CS is tied/held low, the MSB is presented on SDO after rising FS. Output data is valid on
the first falling edge of SCLK. (This is typically used with an active FS from a DSP.)
VDD
6
I
Positive supply voltage
VREF
2
I
External reference input
TLC2552/55
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
AIN0 /AIN(+)
4
I
Analog input channel 0 for TLC2552—Positive input for TLC2555
AIN1/AIN (–)
5
I
Analog input channel 1 for TLC2552—Inverted input for TLC2555
CS
1
I
Chip select. A high-to-low transition on CS removes SDO from 3-state within a maximum delay time. This pin can
be connected to the FS output from a DSP on a dedicated serial port.
GND
3
I
Ground return for the internal circuitry. Unless otherwise noted, all voltage measurements are with respect to GND.
SCLK
7
I
Output serial clock. This terminal receives the serial SCLK from the host processor.
SDO
8
O
The 3-state serial output for the A/D conversion result. SDO is kept in the high-impedance state when CS is high
and presents output data after the CS falling edge until the LSB is presented. The output format is MSB first. SDO
returns to the Hi-Z state after the 16th SCLK. Output data is valid on the falling SCLK edge.
VDD
6
I
Positive supply voltage
VREF
2
I
External reference input
detailed description
The TLC2551, TLC2552, and TLC2555 are successive approximation (SAR) ADCs utilizing a charge
redistribution DAC. Figure 1 shows a simplified version of the ADC.
The sampling capacitor acquires the signal on AIN during the sampling period. When the conversion process
starts, the SAR control logic and charge redistribution DAC are used to add and subtract fixed amounts of charge
from the sampling capacitor to bring the comparator into a balanced condition. When the comparator is
balanced, the conversion is complete and the ADC output code is generated.


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