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/TI SOP8 TLC549CDR Communication IC

TI SOP8 TLC549CDR Communication IC

8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL

The TLC548 and TLC549 are CMOS analog-to-digital converter (ADC) integrated circuits built around an 8-bitswitched-capacitor  successive-approximation  ADC.  These  devices  are  designed  for  serial  interface  with  amicroprocessor or peripheral through a 3-state data output and an analog input. The TLC548 and TLC549 useonly  the  input/output  clock  (I/O  CLOCK)  input  along  with  the  chip  select  (CS)  input  for  data  control.  Themaximum I/O CLOCK input frequency of the TLC548 is 2.048 MHz, and the I/O CLOCK input frequency of theTLC549 is specified up to 1.1 MHz.


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Description

The TLC548 and TLC549 are CMOS analog-to-digital converter (ADC) integrated circuits built around an 8-bitswitched-capacitor  successive-approximation  ADC.  These  devices  are  designed  for  serial  interface  with  amicroprocessor or peripheral through a 3-state data output and an analog input. The TLC548 and TLC549 useonly  the  input/output  clock  (I/O  CLOCK)  input  along  with  the  chip  select  (CS)  input  for  data  control.  Themaximum I/O CLOCK input frequency of the TLC548 is 2.048 MHz, and the I/O CLOCK input frequency of theTLC549 is specified up to 1.1 MHz.

Operation of the TLC548 and the TLC549 is very similar to that of the more complex TLC540 and TLC541devices; however, the TLC548 and TLC549 provide an on-chip system clock that operates typically at 4 MHzand requires no external components. The on-chip system clock allows internal device operation to proceedindependently of serial input/output data timing and permits manipulation of the TLC548 and TLC549 as desiredfor a wide range of software and hardware requirements. The I/O CLOCK together with the internal system clockallow high-speed data transfer and conversion rates of 45 500 conversions per second for the TLC548, and40 000 conversions per second for the TLC549.

Additional TLC548 and TLC549 features include versatile control logic, an on-chip sample-and-hold circuit thatcan  operate  automatically  or  under  microprocessor  control,  and  a  high-speed  converter  with  differentialhigh-impedance reference voltage inputs that ease ratiometric conversion, scaling, and circuit isolation fromlogic and supply noises. Design of the totally switched-capacitor successive-approximation converter circuitallows conversion with a maximum total error of ±0.5 least significant bit (LSB) in less than 17 μs.

The TLC548C and TLC549C are characterized for operation from 0°C to 70°C. The TLC548I and TLC549I arecharacterized for operation from – 40°C to 85°C


Microprocessor Peripheral or StandaloneOperation

8-Bit Resolution A/D Converter

Differential Reference Input Voltages

Conversion Time...17 μs Max

Total Access and Conversion Cycles PerSecond

– TLC548...up to 45500

– TLC549...up to 40000

On-Chip Software-ControllableSample-and-Hold Function

Total Unadjusted Error...±0.5 LSB Max

4-MHz Typical Internal System Clock

Wide Supply Range...3 V to 6 V

Low Power Consumption...15 mW MaxDIdeal for Cost-Effective, High-Performance

Applications including Battery-OperatedPortable Instrumentation

Pinout and Control Signals Compatible

With the TLC540 and TLC545 8-Bit 

A/DConverters and with the TLC1540 10-Bit

A/D Converter

CMOS Technology

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