TLC2558CPWG4 Datasheet

Analog to Digital Converters - ADC


The TLC2558CPWG4 and TLC2554 are a family of high-performance, 12-bit low power, 1.6 µs, CMOS analog-to-digital converters (ADC) which operate from a single 5 V power supply. These devices have three digital inputs and a 3-state output [chip select (CS), serial input-output clock (SCLK), serial data input (SDI), and serial data output (SDO)] that provide a direct 4-wire interface to the serial port of most popular host microprocessors (SPI interface). When interfaced with a DSP, a frame sync (FS) signal is used to indicate the start of a serial data frame. In addition to a high speed A/D converter and versatile control capability, these devices have an on-chip analogmultiplexer that can select any analog inputs or one of three internal self-test voltages. The sample-and-hold function is automatically started after the fourth SCLK edge (normal sampling) or can be controlled by a special pin, CSTART, to extend the sampling period (extended sampling). The normal sampling period can also be programmed as short (12 SCLKs) or as long (24 SCLKs) to accommodate faster SCLK operation popular among high-performance signal processors. The TLC2558 and TLC2554 are designed to operate with very low power consumption. The power-saving feature is further enhanced with software/hardware/auto power down modes and programmable conversion speeds. The converter uses the external SCLK as the source of the conversion clock to achieve higher (up to 1.6 µs when a 20 MHz SCLK is used) conversion speed. There is a 4-V internal reference available. An optional external reference can also be used to achieve maximum flexibility TLC2558CPWG4 Features •Analog Input Range 0 V to Supply VoltageWith 500 kHz BW•Hardware Controlled and ProgrammableSampling Period•Low Operating Current (4 mA at 5.5 VExternal Ref, 6 mA at 5.5 V, Internal Ref)•Power Down: Software/Hardware


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