LTC2445是24-Bit High Speed 8-/16-Channel Delta Sigma ADCs with Selectable Speed/Resolution

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LTC2445 - LTC2445是24-Bit High Speed 8-/16-Channel Delta Sigma ADCs with Selectable Speed/Resolution

LTC2445是Linear公司的一款无延迟增量累加 ADC产品，LTC2445是24-Bit High Speed 8-/16-Channel Delta Sigma ADCs with Selectable Speed/Resolution，本站介绍了LTC2445的封装应用图解、特点和优点、功能等，并给出了与LTC2445相关的凌力尔特元器件型号供参考。

LTC2445 - 24-Bit High Speed 8-/16-Channel Delta Sigma ADCs with Selectable Speed/Resolution

LTC2445 - 24-Bit High Speed 8-/16-Channel Delta Sigma ADCs with Selectable Speed/Resolution - Linear Technology（凌力尔特）

功能描述

The LTC2444/LTC2445/LTC2448/LTC2449 are 8-/16- channel (4-/8-differential) high speed 24-bit No Latency Delta SigmaTM ADCs. They use a proprietary delta-sigma architecture enabling variable speed/resolution. Through a simple 4-wire serial interface, ten speed/resolution combinations 6.9Hz/280nVRMS to 3.5kHz/25μVRMS (4kHz with external oscillator) can be selected with no latency between conversion results or shift in DC accuracy (offset, full-scale, linearity, drift). Additionally, a 2X speed mode can be selected enabling output rates up to 7kHz (8kHz if an external oscillator is used) with one cycle latency.

Any combination of single-ended or differential inputs can be selected with a common mode input range from ground to VCC, independent of VREF. While operating in the 1X speed mode the first conversion following a new speed, resolution, or channel selection is valid. Since there is no settling time between conversions, all 8 differential channels can be scanned at a rate of 500Hz. At the conclusion of each conversion, the converter is internally reset eliminating any memory effects between successive conversions and assuring stability of the high order delta-sigma modulator.

特点

Up to 8 Differential or 16 Single-Ended Input Channels

Up to 8kHz Output Rate

Up to 4kHz Multiplexing Rate

Selectable Speed/Resolution

2μVRMS Noise at 1.76kHz Output Rate

200nVRMS Noise at 13.8Hz Output Rate with Simultaneous 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

LTC2445/LTC2449 Include MUXOUT/ADCIN for External Buffering or Gain

Tiny QFN 5mm x 7mm Package

应用

High Speed Multiplexing

Weight Scales

Auto Ranging 6-Digit DVMs

Direct Temperature Measurement

High Speed Data Acquisition

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)
LTC2445CUHF	5x7 QFN-38	C	$7.95	$6.45
LTC2445CUHF#PBF	5x7 QFN-38	C	$7.95	$6.45
LTC2445CUHF#TR	5x7 QFN-38	C		$6.55
LTC2445CUHF#TRPBF	5x7 QFN-38	C		$6.55
LTC2445IUHF	5x7 QFN-38	I	$9.15	$7.45
LTC2445IUHF#PBF	5x7 QFN-38	I	$9.15	$7.45
LTC2445IUHF#TR	5x7 QFN-38	I		$7.55
LTC2445IUHF#TRPBF	5x7 QFN-38	I		$7.55