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參數(shù)資料
| 型號(hào)： | DS1843D+TRL |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CIRCUIT SAMPLE-N-HOLD 8-UDFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 采樣和保持 |
| 應(yīng)用： | 光纖學(xué)網(wǎng)絡(luò) |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-WFDFN |
| 供應(yīng)商設(shè)備封裝： | 8-uDFN（2x2） |
| 包裝： | 帶卷 (TR) |
DS1843
Fast Sample-and-Hold Circuit
_______________________________________________________________________________________
7
Applications Information
Power-Supply Decoupling
To achieve the best results when using the DS1843,
decouple the power-supply pin, VCC, with a 0.01F or
0.1F capacitor. Use a high-quality X7R or equivalent
ceramic surface-mount capacitor.
DS1843 Estimated Settling Time
The settling time is dependent on the gain ratio of the
current mirror used at the input of the DS1843. For
example, the MAX4007 includes a 10:1 ratio current
mirror. This requires a 5k
resistor to create a 1V full-
scale output with 2mA current input to the MAX4007.
This resistor can be decreased to 2.5k
by using the
DS1842, which has a 5:1 ratio current mirror.
Variable Definitions:
RIN: Input resistor. The current mirror creates a voltage
across this resistor.
RSW: Resistance of series switch that connects internal
circuitry to input pins after tIST time.
CIN: 7pF parasitic (ESD) capacitor.
CPAR: External parasitic capacitance. A current mirror's
output and typical trace capacitance are less than
10pF.
CS: 5pF sample capacitor.
tIST: Internal settling time based on tS from the AC elec-
trical specification. The minimum tS includes one time
constant. tIST removes this time constant.
tRC: RC settling time of the input.
Figure 1 shows the simplified diagram of input imped-
ances for settling time calculations. Sample time is
divided into two parts:
1) tIST: Internal settling time (max 250ns). During this
time, voltage VIN (VINP - VINN) rises with a time con-
stant of:
RIN x (CIN + CPAR)
2) tRC: During this period two things happen:
a. Input VIN keeps increasing from its value at tIST
to its final value with a new time constant of:
b. RSW and CS track this VIN (input) with a time con-
stant of RSW x CS, which is 12.5ns (worst case).
Example:
Approximate accuracy calculations can be done for an
input voltage based on the above impedance values.
These calculations can be divided into three parts.
1) Accuracy of input at tIST (250ns):
where t1 = tIST = 250ns.
At tIST the internal circuit tags input impedance.
This causes charge redistribution to occur, which
causes a dip in the input voltage. The worst-case
value of the input voltage at tIST is:
V
C
CC
C
e
IN
t
S
IN
PAR
S
t
IST
@
=
++
()
×
11
R
RC
C
IN
PAR
V
×+
()
×
Accuracy
e
t
RC
C
IN
PAR
=
×+
()
1
RC
C
R
C
IN
PAR
SW
S
×+
()
() +×
()
2
DS1843
CS
CIN
CPAR
CIN
INPUT MODEL
RSW
VINP
VINN
RSW
RIN
CURRENT
MIRROR OUTPUT
Figure 1. Input Impedances for Settling Time Calculations Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1843K | 功能描述:放大器 IC 開發(fā)工具 Fast Sample & Hold Circuit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V |
| DS1844 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Quad Digital Potentiometer |
| DS1844_05 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Quad Digital Potentiometer |
| DS1844-010 | 功能描述:數(shù)字電位計(jì) IC RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS1844-010+ | 功能描述:數(shù)字電位計(jì) IC Quad RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
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