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

The LTC®2444/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

产品特点 Features 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 封装	应用 High Speed Multiplexing Weight Scales Auto Ranging 6-Digit DVMs Direct Temperature Measurement High Speed Data Acquisition 典型应用图参数

产品特点 Features

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

封装

应用

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

典型应用图

参数

LTC2445 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) *
LTC2445CUHF	SSOP	38	C	$10.64	$7.45
LTC2445CUHF#PBF	SSOP	38	C	$10.64	$7.45
LTC2445CUHF#TR	SSOP	38	C		$7.55
LTC2445CUHF#TRPBF	SSOP	38	C		$7.55
LTC2445IUHF	SSOP	38	I	$12.77	$8.94
LTC2445IUHF#PBF	SSOP	38	I	$12.77	$8.94
LTC2445IUHF#TR	SSOP	38	I		$9.04
LTC2445IUHF#TRPBF	SSOP	38	I		$9.04

LTC2445 数据手册及相关资料下载

数据手册(英文) : LTC2444/LTC2445/ LTC2448/LTC2449- 24-Bit High Speed 8-/16-Channel Delta Sigma ADCs with Selectable Speed/Resolution.PDF
可靠性数据 : R461 Reliability Data .PDF
产品选型卡 : No Latency Delta-Sigma™ ADCs.PDF
产品选型卡 : LTC2440: 24-Bit High Speed Differential ΔΣ ADC.PDF