LTC2442 内置放大器的 24 位高速 4 通道 ΔΣ ADC

The LTC®2442 is an ultra high precision, variable speed, 24-bit ΔΣTM ADC with integrated ampliﬁer. The ampliﬁer can be conﬁgured as a buffer for easy input drive of high impedance sensors. 1 part-per-million (ppm) linearity is achievable when the ampliﬁer is conﬁgured in unity gain. External resistors can be used to set a gain for increased resolution of low level input signals. The positive and negative ampliﬁer supply pins may be tied directly to VCC (4.5V to 5.5V) and GND or biased above VCC and below GND for rail-to-rail input signals.

The proprietary ΔΣ architecture ensures stable DC accuracy through continuous transparent calibration. Ten speed/resolution combinations from 6.9Hz/220nVRMS to 3.5kHz/25µVRMS can be selected with no latency or shift in DC accuracy. Additionally, a 2X speed mode can be selected enabling output rates up to 7kHz (8kHz with an external oscillator) with one cycle latency.

Any combination of single-ended (up to 4 inputs) or differential (up to 2 inputs) can be selected with a common mode input range from ground to VCC. While operating in the 1X speed mode the ﬁ rst conversion following a new speed/resolution or channel selection is valid

产品特点 Features 1ppm linearity with No Missing Codes Integrated Ampliﬁ er for Direct Sensor Digitization 2 Differential or 4 Single-Ended Input Channels Up to 8kHz Output Rate Up to 4kHz Multiplexing Rate Selectable Speed/Resolution 2µVRMS Noise at 1.76kHz Output Rate 220nVRMS Noise at 13.8Hz Output Rate with Simultaneous 50Hz/60Hz Rejection Guaranteed Modulator Stability and Lock-Up Immunity for any Input and Reference Conditions <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 36-Lead SSOP Package 封装	应用 Auto Ranging 6-Digit DVMs High Speed Multiplexing Weight Scales Direct Temperature Measurement High Speed Data Acquisition 典型应用图参数

产品特点 Features

1ppm linearity with No Missing Codes
Integrated Ampliﬁ er for Direct Sensor Digitization
2 Differential or 4 Single-Ended Input Channels
Up to 8kHz Output Rate
Up to 4kHz Multiplexing Rate
Selectable Speed/Resolution
2µVRMS Noise at 1.76kHz Output Rate
220nVRMS Noise at 13.8Hz Output Rate with
Simultaneous 50Hz/60Hz Rejection
Guaranteed Modulator Stability and Lock-Up Immunity for any Input and Reference Conditions
<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
36-Lead SSOP Package

封装

应用

Auto Ranging 6-Digit DVMs
High Speed Multiplexing
Weight Scales
Direct Temperature Measurement
High Speed Data Acquisition

典型应用图

参数

LTC2442 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LTC2442CG	SSOP	36	C	$10.64	$7.45
LTC2442CG#PBF	SSOP	36	C	$10.64	$7.45
LTC2442CG#TR	SSOP	36	C		$7.55
LTC2442CG#TRPBF	SSOP	36	C		$7.55
LTC2442IG	SSOP	36	I	$12.77	$8.94
LTC2442IG#PBF	SSOP	36	I	$12.77	$8.94
LTC2442IG#TR	SSOP	36	I		$9.04
LTC2442IG#TRPBF	SSOP	36	I		$9.04

LTC2442 数据手册及相关资料下载

数据手册(英文) : LTC2442 - 24-Bit High Speed 4-Channel Delta Sigma ADC with Integrated Amplifier.PDF
可靠性数据 : R415 Reliability Data .PDF
产品选型卡 : No Latency Delta-Sigma™ ADCs.PDF
LT Journal : Mar 2003 24-Bit ADC Challenges ΔΣ Conventions.PDF
产品新闻发布 (中文) : 高速 24 位 ΔΣ ADC 集成了用于高源阻抗传感器的放大器前端.PDF