LTC2446是24-Bit High Speed 8-Channel Delta Sigma ADCs with Selectable Multiple Reference Inputs

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LTC2446 - LTC2446是24-Bit High Speed 8-Channel Delta Sigma ADCs with Selectable Multiple Reference Inputs

LTC2446是Linear公司的一款无延迟增量累加 ADC产品，LTC2446是24-Bit High Speed 8-Channel Delta Sigma ADCs with Selectable Multiple Reference Inputs，本站介绍了LTC2446的封装应用图解、特点和优点、功能等，并给出了与LTC2446相关的凌力尔特元器件型号供参考。

LTC2446 - 24-Bit High Speed 8-Channel Delta Sigma ADCs with Selectable Multiple Reference Inputs

LTC2446 - 24-Bit High Speed 8-Channel Delta Sigma ADCs with Selectable Multiple Reference Inputs - Linear Technology（凌力尔特）

功能描述

The LTC2446/LTC2447 4-terminal switching enables multiplexed ratiometric measurements. Four sets of selectable differential inputs coupled with four sets of differential reference inputs allow multiple RTDs, bridges and other sensors to be digitized by a single converter. A fifth differential reference input can be selected for any input channel not requiring ratiometric measurements (thermocouples, voltages, current sense, etc.). The flexible input multiplexer allows single-ended or differential inputs coupled with a slaved reference input or a universal reference input.

A proprietary delta-sigma architecture results in absolute accuracy (offset, full-scale, linearity) of 15ppm, noise as low as 200nVRMS and speeds as high as 8kHz. Through a simple 4-wire interface, ten speed/resolution combinations can be selected. The first conversion following a speed, resolution, channel change or reference change is valid since there is no settling time between conversions, enabling scan rates of up to 4kHz. Additionally, a 2x mode can be selected for any speed-enabling output rates up to 8kHz with one cycle of latency.

Protected by U.S. Patents, including 6140950, 6169506, 6208279, 6411242, 6639526

特点

Five Selectable Differential Reference Inputs

Four Differential/Eight Single-Ended Inputs

4-Way MUX for Multiple Ratiometric

Measurements

Up to 8kHz Output Rate

Up to 4kHz Multiplexing Rate

Selectable Speed/Resolution:2μVRMS Noise at 1.76kHz Output Rate200nVRMS Noise at 13.8Hz Output Rate withSimultaneous 50/60Hz Rejection

Guaranteed Modulator Stability and Lock-Up Immunity for any Input and Reference Conditions

0.0005% INL, No Missing Codes

Autosleep Enables 20μA Operation at 6.9Hz

<5μV Offset (4.5V < VCC < 5.5V, –40°C to 85°C)

Differential Input and Differential Reference with GND to VCC Common Mode Range

No Latency Mode, Each Conversion is Accurate Even After a New Channel is Selected

Internal Oscillator—No External Components

LTC2447 Includes MUXOUT/ADCIN for External Buffering or Gain

Tiny QFN 5mm x 7mm Package

应用

Flow

Weight Scales

Pressure

Direct Temperature Measurement

Gas Chromatography

以下列出了不同封装及包装形式的具体型号,并标出了直接在linear官网上订货的价格（美元）

器件型号	封装	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量)
LTC2446CUHF	5x7 QFN-38	C	$8.75	$7.15
LTC2446CUHF#PBF	5x7 QFN-38	C	$8.75	$7.15
LTC2446CUHF#TR	5x7 QFN-38	C		$7.25
LTC2446CUHF#TRPBF	5x7 QFN-38	C		$7.25
LTC2446IUHF	5x7 QFN-38	I	$10.15	$8.25
LTC2446IUHF#PBF	5x7 QFN-38	I	$10.15	$8.25
LTC2446IUHF#TR	5x7 QFN-38	I		$8.35
LTC2446IUHF#TRPBF	5x7 QFN-38	I		$8.35