- 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： | 28/28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页当前第28页
9
LTC1418
APPLICATIONS INFORMATION
WU
U
Referring to Figure 1, the AIN+ and AIN– inputs are con-
nected to the sample-and-hold capacitors (CSAMPLE) dur-
ing the acquire phase and the comparator offset is nulled by
the zeroing switches. In this acquire phase, a minimum
delay of 1
s will provide enough time for the sample-and-
hold capacitors to acquire the analog signal. During the
convert phase the comparator zeroing switches open,
putting the comparator into compare mode. The input
switches the CSAMPLE capacitors to ground, transferring
the differential analog input charge onto the summing
junction. This input charge is successively compared with
the binary weighted charges supplied by the differential
capacitive DAC. Bit decisions are made by the high speed
comparator. At the end of a conversion, the differential
DAC output balances the AIN
+ and AIN– input charges. The
SAR contents (a 14-bit data word) which represent the
difference of AIN+ and AIN– are loaded into the 14-bit
output latches.
DYNAMIC PERFORMANCE
The LTC1418 has excellent high speed sampling capabil-
ity. FFT (Fast Fourier Transform) test techniques are used
to test the ADC’s frequency response, distortion and noise
at the rated throughput. By applying a low distortion sine
wave and analyzing the digital output using an FFT algo-
rithm, the ADC’s spectral content can be examined for
frequencies outside the fundamental. Figure 2 shows a
typical LTC1418 FFT plot.
Signal-to-Noise Ratio
The signal-to-noise plus distortion ratio [S/(N + D)] is the
ratio between the RMS amplitude of the fundamental input
frequency to the RMS amplitude of all other frequency
components at the A/D output. The output is band limited
to frequencies from above DC and below half the sampling
frequency. Figure 2a shows a typical spectral content with
a 200kHz sampling rate and a 10kHz input. The dynamic
performance is excellent for input frequencies up to and
beyond the Nyquist limit of 100kHz.
FREQUENCY (kHz)
0
10
305070
90
AMPLITUDE
(dB)
0
–20
–40
–60
–80
–100
–120
20
40
60
80
1418 F02a
100
fSAMPLE = 200kHz
fIN = 9.9609375kHz
SFDR = 99.32
SINAD = 82.4
Figure 2a. LTC1418 Nonaveraged, 4096 Point FFT,
Input Frequency = 10kHz
FREQUENCY (kHz)
0
10
305070
90
AMPLITUDE
(dB)
0
–20
–40
–60
–80
–100
–120
20
40
60
80
1418 F02b
100
fSAMPLE = 200kHz
fIN = 97.509765kHz
SFDR = 94.29
SINAD = 81.4
Figure 2b. LTC1418 Nonaveraged, 4096 Point FFT,
Input Frequency = 97.5kHz
Effective Number of Bits
The effective number of bits (ENOBs) is a measurement of
the resolution of an ADC and is directly related to the
S/(N + D) by the equation:
N = [S/(N + D) – 1.76]/6.02
where N is the effective number of bits of resolution and
S/(N + D) is expressed in dB. At the maximum sampling
rate of 200kHz the LTC1418 maintains near ideal ENOBs
up to the Nyquist input frequency of 100kHz (refer to
Figure 3).
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。