TLC2554

12 位 400KSPS ADC，4 通道 具有断电功能的串行

The TLC2558 and are a family of high-performance, 12-bit low power, 1.6 us, 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 analog multiplexer 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 us 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.

.

Maximum Throughput 400 KSPS

.

Built-In Reference and 8× FIFO

.

Differential/Integral Nonlinearity Error:

±1 LSB

.

Signal-to-Noise and Distortion Ratio:

69 dB, fi = 12 kHz

.

Spurious Free Dynamic Range: 75 dB,

fi = 12 kHz

.

SPI/DSP-Compatible Serial Interfaces With SCLK up to 20 MHz

.

Single Supply 5 Vdc

.

Analog Input Range 0 V to Supply Voltage With 500 kHz BW

.

Hardware Controlled and Programmable Sampling Period

.

Low Operating Current 4 mA at 5.5 V External Ref, 6 mA at 5.5 V, Internal Ref

.

Power Down: Software/Hardware Power-Down Mode 1 uA Max, Ext Ref,

Auto Power-Down Mode 1 uA, Ext Ref

.

Programmable Auto-Channel Sweep