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LTC2449C PDF预览

LTC2449C

更新时间: 2024-02-20 06:01:09
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
28页 258K
描述
24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution

LTC2449C 技术参数

是否无铅: 含铅是否Rohs认证: 符合
生命周期:Active包装说明:HVQCCN,
针数:38Reach Compliance Code:compliant
风险等级:5.1最大模拟输入电压:2.75 V
最小模拟输入电压:-0.05 V最长转换时间:170000 µs
转换器类型:ADC, DELTA-SIGMAJESD-30 代码:R-PQCC-N38
JESD-609代码:e3长度:7 mm
湿度敏感等级:1模拟输入通道数量:16
位数:24功能数量:1
端子数量:38最高工作温度:85 °C
最低工作温度:-40 °C输出位码:BINARY
输出格式:SERIAL封装主体材料:PLASTIC/EPOXY
封装代码:HVQCCN封装形状:RECTANGULAR
封装形式:CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE峰值回流温度(摄氏度):260
认证状态:Not Qualified座面最大高度:0.8 mm
标称供电电压:5 V表面贴装:YES
温度等级:INDUSTRIAL端子面层:Matte Tin (Sn)
端子形式:NO LEAD端子节距:0.5 mm
端子位置:QUAD处于峰值回流温度下的最长时间:30
宽度:5 mmBase Number Matches:1

LTC2449C 数据手册

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LTC2444/LTC2445/  
LTC2448/LTC2449  
24-Bit High Speed  
8-/16-Channel ∆Σ ADCs with  
Selectable Speed/Resolution  
U
FEATURES  
DESCRIPTIO  
The LTC®2444/LTC2445/LTC2448/LTC2449 are 8-/16-  
channel (4-/8-differential) high speed 24-bit No Latency  
∆ΣTM ADCs. They use a proprietary delta-sigma architec-  
ture 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 con-  
version 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.  
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)  
Any combination of single-ended or differential inputs can  
beselectedwithacommonmodeinputrangefromground  
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 chan-  
nels can be scanned at a rate of 500Hz. At the conclusion  
of each conversion, the converter is internally reset elimi-  
nating any memory effects between successive conver-  
sions and assuring stability of the high order delta-sigma  
modulator.  
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 xU7mm Package  
APPLICATIO S  
High Speed Multiplexing  
Weight Scales  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
No Latency ∆Σ is a trademark of Linear Technology Corporation.  
Auto Ranging 6-Digit DVMs  
Direct Temperature Measurement  
High Speed Data Acquisition  
U
TYPICAL APPLICATIO  
LTC2444/LTC2448  
Simple 24-Bit Variable Speed Data Acquisition System  
Speed vs RMS Noise  
4.5V TO 5.5V  
100  
10  
1
V
V
V
= 5V  
CC  
= 5V  
IN  
REF  
1µF  
+
= V = 0V  
IN  
+
REF  
V
2X SPEED MODE  
CC  
CH0  
CH1  
= EXTERNAL OSCILLATOR  
NO LATENCY MODE  
= INTERNAL OSCILLATOR  
F
O
(SIMULTANEOUS 50Hz/60Hz  
REJECTION AT 6.9Hz OUTPUT RATE)  
2.8µV AT 880Hz  
CH7  
CH8  
SDI  
SCK  
SDO  
CS  
16-CHANNEL  
MUX  
VARIABLE SPEED/  
RESOLUTION  
DIFFERENTIAL  
24-BIT ∆Σ ADC  
280nV AT 6.9Hz  
(50/60Hz REJECTION)  
+
4-WIRE  
SPI INTERFACE  
THERMOCOUPLE  
CH15  
COM  
0.1  
REF  
1
10  
100  
1000  
10000  
CONVERSION RATE (Hz)  
GND  
LTC2448  
2440 TA02  
2444 TA01  
sn2444589 2444589fs  
1

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