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参数资料
| 型号： | DS1843D+TRL |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC CIRCUIT SAMPLE-N-HOLD 8-UDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 采样和保持 |
| 应用： | 光纤学网络 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN |
| 供应商设备封装： | 8-uDFN（2x2） |
| 包装： | 带卷 (TR) |
DS1843
Fast Sample-and-Hold Circuit
6
_______________________________________________________________________________________
Detailed Description
The DS1843 consists of a fully differential sampling
capacitor, switches, and a differential output buffer. It is
designed to operate in fiber optic burst-mode systems;
however, it can be used in other applications requiring
a fast sample-and-hold circuit. The output can be con-
figured for single-ended operations.
Input Sampling Capacitor
The input voltage is sampled using a 5pF capacitor on
the positive input and another on the negative input.
The capacitors are connected to the input when SEN is
high. In addition to the sampling capacitors, the inputs
also have parasitic capacitance (CIN). These capaci-
tors must fully charge before SEN is switched to low in
order to ensure accurate sampling. An RC time con-
stant is created by the resistance of the voltage source
connected to the DS1843’s input and the capacitances
on this node. See the
Applications Information section
for details.
Output Buffer
After sampling is complete, the sampling capacitor is
switched to the output buffer. This buffer requires a
small amount of time to settle, tOUT. When an ADC is
used to measure the DS1843’s output, a step occurs at
the ADC’s input caused by the ADC’s internal sampling
capacitor. The DS1843’s recovery time, tREC, is depen-
dent on the size of the ADC’s sampling capacitor and
the voltage applied across the ADC. To maximize
accuracy, the ADC’s sampling speed (ADC clock fre-
quency) should be reduced until the ADC’s conversion
window (tADC:ST, as shown in the Timing Diagram) is
larger than the DS1843’s recovery time. Refer to the
ADC’s documentation for tADC:ST.
Sampling Time and Output Error
As the sampling time (tS) is decreased, the output error
increases. The output error is largely dependent on the
settling time of the sampling capacitor and, to a lesser
degree, the output buffer’s gain error and offset volt-
age. Settling time can be reduced by driving the
DS1843 with a lower impedance. In a typical fiber optic
application, a current is applied across a 5k
resistor.
By using a stronger current source, the resistance and
the settling time can be reduced (see the
Applications
Information section for details).
Pin Description
PIN
NAME
FUNCTION
1
VCC
Power-Supply Input
2
VINP
Positive Voltage Input. Input to sample circuit.
3
VINN
Negative Voltage Input. Input to sample circuit.
4
DEN
Differential Output Enable. Connect to VCC for differential output or GND for single-ended output.
5
GND
Ground Terminal
6
VOUTN
Sampled Voltage Negative Output. Buffered output of the hold capacitor. Keep unconnected or
connect to GND for single-ended output mode.
7
VOUTP
Sampled Voltage Positive Output and Single-Ended Output. Buffered output of the hold capacitor.
8
SEN
Sample Enable. Enables input sampling. This input is pulsed.
Block Diagram
DS1843
VOUTN
CS
VCC
VINP
VINN
SEN
GND
CIN
VOUTP
CONTROL
LOGIC
DEN
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1843K | 功能描述:放大器 IC 开发工具 Fast Sample & Hold Circuit RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| DS1844 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Quad Digital Potentiometer |
| DS1844_05 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Quad Digital Potentiometer |
| DS1844-010 | 功能描述:数字电位计 IC RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel |
| DS1844-010+ | 功能描述:数字电位计 IC Quad RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel |
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