- 您现在的位置：买卖IC网 > PDF目录17066 > DC178A (Linear Technology)BOARD SAR ADC LTC1418 PDF资料下载
参数资料
| 型号： | DC178A |
| 厂商： | Linear Technology |
| 文件页数： | 3/28页 |
| 文件大小： | 0K |
| 描述： | BOARD SAR ADC LTC1418 |
| 设计资源： | DC178A Design File DC178A Schematic |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 14 |
| 采样率（每秒）： | 200k |
| 数据接口： | 串行，并联 |
| 输入范围： | ±2.048 V |
| 已用 IC / 零件： | LTC1418 |
| 已供物品： | 板 |
| 相关产品： | LTC1418IG#PBF-ND - IC A/D CONV 14BIT SRL&PAR 28SSOP LTC1418AIG#TRPBF-ND - IC A/D CONV 14BIT SRL&PAR 28SSOP LTC1418CG#TRPBF-ND - IC A/D CONV 14BIT SRL&PAR 28SSOP LTC1418ACG#TRPBF-ND - IC A/D CONV 14BIT SRL&PAR 28SSOP LTC1418IG#TRPBF-ND - IC A/D CONV 14BIT SRL&PAR 28SSOP LTC1418CN#PBF-ND - IC A/D CONV 14BIT SRL&PAR 28-DIP LTC1418IN#PBF-ND - IC A/D CONV 14BIT SRL&PAR 28-DIP LTC1418CG#PBF-ND - IC A/D CONV 14BIT SRL&PAR 28SSOP LTC1418ACG#PBF-ND - IC A/D CONV 14BIT SRL&PAR 28SSOP LTC1418AIG#PBF-ND - IC A/D CONV 14BIT SRL&PAR 28SSOP 更多... |
第1页第2页当前第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
11
LTC1418
APPLICATIONS INFORMATION
WU
U
Full-Power and Full-Linear Bandwidth
The full-power bandwidth is that input frequency at which
the amplitude of the reconstructed fundamental is
reduced by 3dB for a full-scale input signal.
The full-linear bandwidth is the input frequency at which
the S/(N + D) has dropped to 77dB (12.5 effective bits).
The LTC1418 has been designed to optimize input band-
width, allowing the ADC to undersample input signals with
frequencies above the converter’s Nyquist Frequency. The
noise floor stays very low at high frequencies; S/(N + D)
becomes dominated by distortion at frequencies far
beyond Nyquist.
DRIVING THE ANALOG INPUT
The differential analog inputs of the LTC1418 are easy to
drive. The inputs may be driven differentially or as a single-
ended input (i.e., the AIN
– input is grounded). The AIN+ and
AIN– inputs are sampled at the same instant. Any
unwanted signal that is common mode to both inputs will
be reduced by the common mode rejection of the sample-
and-hold circuit. The inputs draw only one small current
spike while charging the sample-and-hold capacitors at
the end of conversion. During conversion, the analog
inputs draw only a small leakage current. If the source
impedance of the driving circuit is low then the LTC1418
inputs can be driven directly. As source impedance
increases so will acquisition time (see Figure 6). For
minimum acquisition time, with high source impedance, a
buffer amplifier must be used. The only requirement is that
the amplifier driving the analog input(s) must settle after
the small current spike before the next conversion starts —
1
s for full throughput rate.
Choosing an Input Amplifier
Choosing an input amplifier is easy if a few requirements
are taken into consideration. First, choose an amplifier that
has a low output impedance (<100
) at the closed-loop
bandwidth frequency. For example, if an amplifier is used
in a gain of 1 and has a closed-loop bandwidth of 10MHz,
then the output impedance at 10MHz must be less than
100
. The second requirement is that the closed-loop
bandwidth must be greater than 5MHz to ensure adequate
small-signal settling for full throughput rate. If slower op
amps are used, more settling time can be provided by
increasing the time between conversions.
The best choice for an op amp to drive the LTC1418 will
depend on the application. Generally, applications fall into
two categories: AC applications where dynamic specifica-
tions are most critical and time domain applications where
DC accuracy and settling time are most critical. The
following list is a summary of the op amps that are suitable
for driving the LTC1418. More detailed information is
available in the Linear Technology Databooks and on the
LinearView
TM CD-ROM.
LT
1354: 12MHz, 400V/
s Op Amp. 1.25mA maximum
supply current. Good AC and DC specifications. Suitable
for dual supply application.
LT1357: 25MHz, 600V/
s Op Amp. 2.5mA maximum
supply current. Good AC and DC specifications. Suitable
for dual supply application.
LT1366/LT1367: Dual/Quad Precision Rail-to-Rail Input
and Output Op Amps. 375
A supply current per amplifier.
1.8V to
±15V supplies. Low input offset voltage: 150V.
Good for low power and single supply applications with
sampling rates of 20ksps and under.
LT1498/LT1499: 10MHz, 6V/
s, Dual/Quad Rail-to-Rail
Input and Output Op Amps. 1.7mA supply current per
Figure 6. tACQ vs Source Resistance
SOURCE RESISTANCE (
)
1
ACQUISITION
TIME
(
s)
10
1
100
1k
10k
1418 F06
0.1
10
100
100k
LinearView is a trademark of Linear Technology Corporation.
相关PDF资料 |
PDF描述 |
|---|---|
| EBM22DSEN-S243 | CONN EDGECARD 44POS .156 EYELET |
| DC1186A | BOARD SAR ADC LTC2308 |
| MDP-XOMAP3630-10-1024512R | KIT MOBILE DEV ZOOM OMAP36X |
| V24C48E150BL3 | CONVERTER MOD DC/DC 48V 150W |
| EVAL-AD5764REBZ | EVAL BOARD FOR AD5764 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DC1792 | 功能描述:BOARD DAC LTC2756 RoHS:是 类别:编程器，开发系统 >> 评估板 - 数模转换器 (DAC) 系列:QuikEval™, SoftSpan™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- DAC 的数量:4 位数:12 采样率（每秒）:- 数据接口:串行，SPI? 设置时间:3µs DAC 型:电流/电压 工作温度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
| DC1792A | 制造商:Linear Technology 功能描述:EVAL BOARD, LTC2756 18BIT DAC 制造商:Linear Technology 功能描述:EVAL BOARD, LTC2756 18BIT DAC; Silicon Manufacturer:Linear Technology; Silicon Core Number:LTC2756; Kit Contents:Evaluation Board for LTC2756; Features:SoftSpan IOUT DAC, SPI Interface; Length:29mm |
| DC1796A-A | 制造商:Linear Technology 功能描述:16BIT ADC Eval Brd 制造商:Linear Technology 功能描述:16BIT ADC Eval Brd; Silicon Manufacturer:Linear Technology; Silicon Core Number:LTC6360; Kit Application Type:Data Converter; Application Sub Type:ADC; Kit Contents:Board, Guide |
| DC1796A-B | 制造商:Linear Technology 功能描述:16BIT ADC Eval Brd 制造商:Linear Technology 功能描述:16BIT ADC Eval Brd; Silicon Manufacturer:Linear Technology; Silicon Core Number:LTC6360; Kit Application Type:Data Converter; Application Sub Type:ADC; Kit Contents:Board, Guide |
| DC1796A-C | 制造商:Linear Technology 功能描述:16BIT ADC Eval Brd 制造商:Linear Technology 功能描述:16BIT ADC Eval Brd; Silicon Manufacturer:Linear Technology; Silicon Core Number:LTC6360; Kit Application Type:Data Converter; Application Sub Type:ADC; Kit Contents:Board, Guide |
发布紧急采购，3分钟左右您将得到回复。