TLV990-21屬于集成電路（IC）的模擬前端（AFE）。由美國德州儀器公司制造生產(chǎn)的TLV990-21模擬前端（AFE）模擬前端 (AFE) 是一種用于信號調(diào)節(jié)的半導(dǎo)體器件，由模擬放大器、運(yùn)算放大器、濾波器和集成電路構(gòu)成。這種可配置功能塊能連接各種傳感器。分辨率范圍從 8 位至 42 位不等，通道數(shù)范圍為 1 至 256 個。

features

Single-Chip CCD Analog Front-End

10-Bit, 21-MSPS, Single 3-V Supply

Operation A/D Converter

Very Low Power: 150-mW Typical, 2-mW

Power-Down Mode

Differential Nonlinearity Error:

< ±0.5 LSB Typical

Integral Nonlinearity Error:

< ±0.75 LSB Typical

Programmable Gain Amplifier (PGA) With

0-dB to 36-dB Gain Range (0.045 dB/Step)

Automatic or Programmable Optical Black

Level and Offset Calibration With Digital

Filter and Bad Pixel Limits

Additional DACs for External Analog

Setting

Serial Interface for Register Configuration

Internal-Reference Voltages

48-Pin TQFP Package

application

Digital Still Camera

Video Camcorder

description

The TLV990-21 is a complete CCD signal

processor/digitizer designed for digital still

camera and PC camera applications. The

TLV990-21 performs all the analog-processing

functions necessary to maximize the dynamic range, corrects various errors associated with the CCD sensor,

and then digitizes the results with an on-chip high-speed analog-to-digital converter (ADC).

The key components of the TLV990-21 include: an input clamp circuit for CCD signal, a correlated double

sampler (CDS), a programmable-gain amplifier (PGA) with 0 to 36-dB gain range, two internal digital-to-analog

converters (DAC) for automatic or programmable optical black level and offset calibration, a 10-bit, 21-MSPS

pipeline ADC, a parallel data port for easy microprocessor interface, a serial port for configuring internal control

registers, two additional DACs for external system control, and internal reference voltages.

Designed in advanced CMOS process, the TLV990-21 operates from a single 3-V power supply with a normal

power consumption of 150 mW at 21 MSPS and 2 mW in power-down mode.

Its very high throughput rate, single 3-V operation, very low-power consumption, and fully-integrated

analog-processing circuitry make the TLV990-21 an ideal CCD signal-processing solution for digital still

cameras and electronic video camcorder applications.

This device is available in a 48-pin TQFP package and is specified over a –20°C to 75°C operating-temperature

range.