TLV2548Q中文资料汽车类 12 位、8 通道、200kSPS ADC，串行输出、自动断电（软件和硬件）、低功耗数据手册TI规格书

描述 Description

The TLV2544Q, TLV2548Q, and TLV2548M are a family of high performance, 12-bit low power, 3.5 µs, CMOS analog-to-digital converters (ADC) which operate from a single 3-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 TLV2544Q and the TLV2548Q are characterized for operation from –40°C to 125°C. The TLV2548M is characterized for operation from –55°C to 125°C.

特性 Features

• Maximum Throughput 200-KSPS
• Built-In Reference, Conversion Clock and 8× FIFO
• Differential/Integral Nonlinearity Error: ±1.2 LSB at –55°C to 125°C
• Signal-to-Noise and Distortion Ratio: 65 dB, fi = 12-kHz at –55°C to 125°C
• Spurious Free Dynamic Range: 75 dB, fi = 12- kHz
• SPI/DSP-Compatible Serial Interfaces With SCLK up to 20-MHz
• Single Wide Range Supply 3 Vdc to 5.5 Vdc
• Analog Input Range 0-V to Supply Voltage With 500 kHz BW
• Hardware Controlled and Programmable Sampling Period
• Low Operating Current (1-mA at 3.3-V, 2-mA at 5.5-V With External Ref, 1.7-mA at 3.3-V, 2.4-mA at 5.5-V With Internal Ref)
• Power Down: Software/Hardware Power-Down Mode (1 µA Typ, Ext Ref), Autopower-Down Mode (1 µA Typ, Ext Ref)
• Programmable Auto-Channel Sweep
• Available in Q-Temp Automotive High Reliability Automotive Applications Configuration Control/Print Support Qualification to Automotive Standards

简介

TLV2548Q属于集成电路（IC）的模数转换器（ADC）。由TI制造生产的TLV2548Q模数转换器（ADC）模数转换器（ADC、A/D 或 A 转 D）对模拟信号进行采样，例如由麦克风采集的声音或传感器的输出，然后将其转换为数字信号。一般来说，数字输出是二进制补码二进制数，与输入成比例。输入类型可能是差分、伪差分或单端输入。模数转换器可按照位数、采样率、输入数、接口、转换器数和架构（例如自适应增量、双斜率、折叠、流水线、SAR、三角积分、两步式）进行选择。