LM98640

更新时间： 2024-09-25 12:21:43

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
47页	1218K
描述
Dual Channel, 14-Bit, 40 MSPS Analog Front End with LVDS Output

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LM98640 数据手册

July 2, 2012

LM98640

Dual Channel, 14-Bit, 40 MSPS Analog Front End with LVDS

Output

General Description

Features

The LM98640 is a fully integrated, high performance 14-bit, 5

MSPS to 40 MSPS signal processing solution for image pro-

cessing applications. The Serial LVDS Output format per-

forms well during ionizing doses, preventing data loss. The

LM98640 has an adaptive power scaling feature to optimize

power consumption based on the operating frequency and

amount of gain required. High-speed signal throughput is

achieved with an innovative architecture utilizing Correlated

Double Sampling (CDS), typically employed with CCD arrays,

or Sample and Hold (S/H) inputs (for Contact Image Sensors

and CMOS image sensors). The sampling edges are pro-

grammable to a resolution of 1/64th of a pixel period. Both the

CDS and S/H have a programmable gain of either 0 dB or 6

dB The signal paths utilize two ±8 bit offset correction DACs

for coarse and fine offset correction, and 8 bit Programmable

Gain Amplifiers (PGA) for each channel. The PGA and offset

DAC are programmed independently allowing unique values

of gain and offset for each input. The signals are then routed

to two on chip 14-bit 40 MHz high performance analog-to-

digital converters (ADC). The fully differential processing

channel provides exceptional noise immunity, having a very

low noise floor of -79 dB with a gain of 1x. The 14-bit ADCs

have excellent dynamic performance making the LM98640

transparent in the image reproduction chain.

Seialized LVDS Outputs

■

LVDS Input Clock

CDS or S/H Processing for CCD or CIS sensors

Programmable Analog Gain for Each Channel

Programmable Analog Offset Correction

Programmable Input Clamp Voltage

Programmable Sampling Edge up to 1/64th pixel period

Key Specifications

Input Level

2.85 Volts

14-Bit

5 MSPS to 40 MSPS

±3.5 LSB

■

ADC Resolution

ADC Sampling Rate

INL @ 15 MHz

CDS or S/H Gain

PGA Gain Steps

PGA Gain Range

Coarse DAC Resolution

Coarse DAC Range

Fine DAC Resolution

Fine DAC Range

Noise Floor

0 dB or 6 dB

256 Steps

-3 dB to 18 dB

±8 Bits

±250 mV

±8 Bits

±5 mV

-79 dB

Crosstalk

Power Consumption

PGA 1-4x Gain

-80 dB

Applications

125 mW per channel (15 MSPS)

140 mW per channel (25 MSPS)

125 mW per channel (15 MSPS)

178 mW per channel (40 MSPS)

Focal Plane Electronics

■

Imaging Attitude Control Systems

PGA 1-8x Gain

Assembly Line Vision Systems

Factory Automation Vision Systems

Supply Voltages

3.3V Nominal (3.15V to 3.45V range)

1.8V Nominal (1.7V to 1.9V range)

High-speed Document Scanner

Multi- Function Peripherals

301374 SNAS596

www.ti.com

12 3 4 5 6 7...47

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与LM98640相关器件

型号	品牌	获取价格	描述	数据表
LM98640CILQ	TI	获取价格	Dual Channel, 14-Bit, 40 MSPS Analog Front End with LVDS Output
LM98640CVAL	TI	获取价格	Dual Channel, 14-Bit, 40 MSPS Analog Front End with LVDS Output
LM98640QML	TI	获取价格	Dual Channel, 14-Bit, 40 MSPS Analog Front End with LVDS Output
LM98640QML-SP	TI	获取价格	具有 LVDS 输出的双通道、14 位、40MSPS 模拟前端
LM98640W-MLS	TI	获取价格	Dual Channel, 14-Bit, 40 MSPS Analog Front End with LVDS Output
LM98640W-MPR	TI	获取价格	Dual Channel, 14-Bit, 40 MSPS Analog Front End with LVDS Output
LM98714	NSC	获取价格	Three Channel, 16-Bit, 45 MSPS Digital Copier Analog Front End with Integrated CCD/CIS Sen
LM98714	TI	获取价格	LM98714 Three Channel, 16-Bit, 45 MSPS Analog Front End with LVDS/CMOS Output
LM98714BCMT	TI	获取价格	LM98714 Three Channel, 16-Bit, 45 MSPS Digital Copier Analog Front End with Integrated CCD
LM98714BCMT/NOPB	TI	获取价格	LM98714 Three Channel, 16-Bit, 45 MSPS Analog Front End with LVDS/CMOS Output

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