Texas Instruments, TLC548C, TLC548I, TLC549C, TLC549I pdf datasheet download

TLC548C, TLC548I, TLC549C, TLC549I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL

Microprocessor Peripheral or Standalone
Operation
8-Bit Resolution A/D Converter
Differential Reference Input Voltages
Conversion Time . . . 17 ms Max
Total Access and Conversion Cycles Per
Second
– TLC548 . . . up to 45 500
– TLC549 . . . up to 40 000
On-Chip Software-Controllable
Sample-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 Max
Ideal for Cost-Effective, High-Performance
Applications including Battery-Operated
Portable Instrumentation
Pinout and Control Signals Compatible
With the TLC540 and TLC545 8-Bit A/D
Converters and with the TLC1540 10-Bit
A/D Converter
CMOS Technology
description
The TLC548 and TLC549 are CMOS analog-to-digital converter (ADC) integrated circuits built around an 8-bit
switched-capacitor successive-approximation ADC. These devices are designed for serial interface with a
microprocessor or peripheral through a 3-state data output and an analog input. The TLC548 and TLC549 use
only the input/output clock (I/O CLOCK) input along with the chip select (CS) input for data control. The
maximum I/O CLOCK input frequency of the TLC548 is 2.048 MHz, and the I/O CLOCK input frequency of the
TLC549 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 TLC541
devices; however, the TLC548 and TLC549 provide an on-chip system clock that operates typically at 4 MHz
and requires no external components. The on-chip system clock allows internal device operation to proceed
independently of serial input/output data timing and permits manipulation of the TLC548 and TLC549 as desired
for a wide range of software and hardware requirements. The I/O CLOCK together with the internal system clock
allow high-speed data transfer and conversion rates of 45 500 conversions per second for the TLC548, and
40 000 conversions per second for the TLC549.
Additional TLC548 and TLC549 features include versatile control logic, an on-chip sample-and-hold circuit that
can operate automatically or under microprocessor control, and a high-speed converter with differential
high-impedance reference voltage inputs that ease ratiometric conversion, scaling, and circuit isolation from
logic and supply noises. Design of the totally switched-capacitor successive-approximation converter circuit
allows conversion with a maximum total error of ±0.5 least significant bit (LSB) in less than 17 ms.
The TLC548C and TLC549C are characterized for operation from 0°C to 70°C. The TLC548I and TLC549I are
characterized for operation from –40°C to 85°C.

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