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| 型号： | LM98725 |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO56 |
| 封装： | TSSOP-56 |
| 文件页数： | 1/14页 |
| 文件大小： | 464K |
| 代理商： | LM98725 |
LM98725
September 24, 2009
3 Channel, 16-Bit, 81 MSPS Analog Front End with LVDS/
CMOS Output, Integrated CCD/CIS Sensor Timing
Generator and Spread Spectrum Clock Generation
General Description
The LM98725 is a fully integrated, high performance 16-Bit,
81 MSPS signal processing solution for digital color copiers,
scanners, and other image processing applications. High-
speed signal throughput is achieved with an innovative archi-
tecture utilizing Correlated Double Sampling (CDS), typically
employed with CCD arrays, or Sample and Hold (S/H) inputs
(for higher speed CCD or CMOS image sensors). The signal
paths utilize 8 bit Programmable Gain Amplifiers (PGA), a
+/-9-Bit offset correction DAC and independently controlled
Digital Black Level correction loops for each input. The PGA
and offset DAC are programmed independently allowing
unique values of gain and offset for each of the three analog
inputs. The signals are then routed to a 81MHz high perfor-
mance analog-to-digital converter (ADC). The fully differential
processing channel shows exceptional noise immunity, hav-
ing a very low noise floor of -74dB. The 16-bit ADC has
excellent dynamic performance making the LM98725 trans-
parent in the image reproduction chain.
A very flexible integrated Spread Spectrum Clock Generation
(SSCG) modulator is included to assist with EM compliance
and reduce system costs.
Applications
■ Multi-Function Peripherals
■ High-speed Currency/Check Scanners
■ Flatbed or Handheld Color Scanners
■ High-speed Document Scanners
Features
■ LVDS/CMOS Outputs
■ LVDS/CMOS/Crystal Clock Source with PLL Multiplication
■ Integrated Flexible Spread Spectrum Clock Generation
■ CDS or S/H Processing for CCD or CIS sensors
■ Independent Gain/Offset Correction for Each Channel
■ Automatic per-Channel Gain and Offset Calibration
■ Programmable Input Clamp Voltage
■ Flexible CCD/CIS Sensor Timing Generator
Key Specifications
■ Maximum Input Level
1.2 or 2.4 Volt Modes
■
(both with + or - polarity option)
■ ADC Resolution
16-Bit
■ ADC Sampling Rate
81 MSPS
■ INL
+17/- 28 LSB (typ)
■ Channel Sampling Rate
30/30/27 MSPS
■ PGA Gain Steps
256 Steps
■ PGA Gain Range
0.62 to 8.3x
■ Analog DAC Resolution
+/-9 Bits
■ Analog DAC Range
+/-307mV or +/-614mV
■ Digital DAC Resolution
+/-6 Bits
■ Digital DAC Range
-2048 LSB to + 2016 LSB
■ SNR
-74dB (@0dB PGA Gain)
■ Power Dissipation
755mW (LVDS)
■ Operating Temp
0 to 70°C
■ Supply Voltage
3.3V Nominal (3.0V to 3.6V range)
System Block Diagram
30085370
2009 National Semiconductor Corporation
300853
www.national.com
LM98725
3
Channel,
16-Bit,
81
MSPS
Analog
Front
End
with
LVDS/CMOS
Output
Integrated
Sensor
Timing
Generator
and
Spread
Spectrum
Clock
Generation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM98725CCMT/NOPB | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| LM98725CCMTX/NOPB | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| LM99 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:【1C Accurate, High Temperature, Remote Diode Temperature Sensor with Two-Wire Interface |
| LM99-1CIMM | 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| LM99-1CIMM/NOPB | 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
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