TLV2544

12 位 200kSPS ADC 系列 输出，自动断电（S/W 和 H/W），低功耗，8 x FIFO，4 通道

The TLV2548 and are a family of high performance, 12-bit low power, 3.86 µs, CMOS analog-to-digital converters ADC which operate from a single 2.7-V to 5.5-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 TLV2548 and TLV2544 are designed to operate with very low power consumption. The power-saving feature is further enhanced with software/hardware/autopower-down modes and programmable conversion speeds. The conversion clock OSC and reference are built-in. The converter can use the external SCLK as the source of the conversion clock to achieve higher up to 2.8 µs when a 20 MHz SCLK is used conversion speed. Two different internal reference voltages are available. An optional external reference can also be used to achieve maximum flexibility.

The TLV2544C and the TLV2548C are characterized for operation from 0°C to 70°C. The TLV2544I and the TLV2548I are characterized for operation from –40°C to 85°C.

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Maximum Throughput 200-KSPS

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Built-In Reference, Conversion Clock and 8× FIFO

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Differential/Integral Nonlinearity Error: ±1 LSB

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Signal-to-Noise and Distortion Ratio: 70 dB, fi = 12-kHz

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Spurious Free Dynamic Range: 75 dB, fi = 12- kHz

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SPI CPOL = 0, CPHA = 0/DSP-Compatible Serial Interfaces With SCLK up to 20-MHz

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Single Wide Range Supply 2.7 Vdc to 5.5 Vdc

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

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Hardware Controlled and Programmable Sampling Period

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Low Operating Current 1.0-mA at 3.3-V, 1.1-mA at 5.5-V With External Ref

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

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Programmable Auto-Channel Sweep