参数资料
| 型号： | LTC1400IS8 |
| 厂商： | Linear Technology |
| 文件页数： | 18/20页 |
| 文件大小： | 0K |
| 描述： | IC A/D CONV 12BIT W/SHTDN 8-SOIC |
| 标准包装： | 100 |
| 位数： | 12 |
| 采样率（每秒）： | 400k |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 160mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 输入数目和类型： | 1 个单端，单极；1 个单端，双极 |
| 产品目录页面： | 1346 (CN2011-ZH PDF) |
LTC1400
7
1400fa
APPLICATIO S I FOR ATIO
W
U
Conversion Details
The LTC1400 uses a successive approximation algorithm
and an internal sample-and-hold circuit to convert an
analog signal to a 12-bit serial output based on a preci-
sion internal reference. The control logic provides easy
interface to microprocessors and DSPs through 3-wire
connections.
A rising edge on the CONV input starts a conversion. At
the start of a conversion the successive approximation
register (SAR) is reset. Once a conversion cycle has begun
it cannot be restarted.
During conversion, the internal 12-bit capacitive DAC
output is sequenced by the SAR from the most signicant
bit (MSB) to the least signicant bit (LSB). Referring to
Figure 1, the AIN input connects to the sample-and-hold
capacitor during the acquired phase and the comparator
offset is nulled by the feedback switch. In this acquire
phase, it typically takes 200ns for the sample-and-hold
capacitor to acquire the analog signal. During the convert
phase, the comparator feedback switch opens, putting the
comparator into the compare mode. The input switches
connect CSAMPLE to ground, injecting the analog input
charge onto the summing junction. This input charge is
successively compared with the binary-weighted charges
supplied by the capacitive DAC. Bit decisions are made by
the high speed comparator. At the end of a conversion,
the DAC output balances the AIN input charge. The SAR
contents (a 12-bit data word) which represent the input
voltage, are output through the serial pin DOUT.
1400 F01
SAMPLE
DOUT
CDAC
VDAC
DAC
AIN
CSAMPLE
–
+
COMP
S
A
R
SAMPLE
S1
HOLD
Figure 1. AIN Input
Dynamic Performance
TheLTC1400hasexcellenthighspeedsamplingcapability.
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
algorithm, the ADC’s spectral content can be examined for
frequencies outside the fundamental. Figure 2a shows a
typical LTC1400 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 DC to half the sampling frequency.
Figure 2a shows a typical spectral content with a 400kHz
sampling rate and a 100kHz input. The dynamic perfor-
mance is excellent for input frequencies up to the Nyquist
limit of 200kHz as shown in Figure 2b.
FREQUENCY (kHz)
0
40
80 100
140
180
20
60
120
160
200
AMPLITUDE
(dB)
1400 F02a
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
fSAMPLE = 400kHz
fIN = 94.824kHz
SINAD = 72.5dB
THD = –82dB
Figure 2a. LTC1400 Nonaveraged, 4096 Point FFT
Plot with 100kHz Input Frequency in Bipolar Mode
Effective Number of Bits
The effective number of bits (ENOBs) is a measurement
of the effective resolution of an ADC and is directly related
to the S/(N + D) by the equation:
N
S N D
=
+
(
)
/
– .
.
1 76
6 02
相关PDF资料 |
PDF描述 |
|---|---|
| LTC1401IS8#TRPBF | IC A/D CONV 12BIT W/SHTDN 8-SOIC |
| LTC1402IGN#TRPBF | IC ADC 12BIT 2.2MSPS SHDN 16SSOP |
| LTC1403AHMSE#TRPBF | IC ADC 14BIT 2.8MSPS DIFF 10MSOP |
| LTC1403AIMSE-1#TRPBF | IC ADC 14BIT 2.8MSPS DIFF 10MSOP |
| LTC1404IS8#TRPBF | IC A/D CONV 12BIT W/SHTDN 8-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1400IS8#PBF | 功能描述:IC A/D CONV 12BIT W/SHTDN 8-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
| LTC1400IS8#TR | 功能描述:IC ADC 12BIT 400KSPS SHTDN 8SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| LTC1400IS8#TRPBF | 功能描述:IC A/D CONV 12BIT W/SHTDN 8-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| LTC1400IS8PBF | 制造商:Linear Technology 功能描述:ADC SAR 400ksps 12-Bit Serial SOIC8 |
| LTC1401CS8 | 功能描述:IC A/D CONV 12BIT W/SHTDN 8-SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 电压电源:单电源 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:38-WFQFN 裸露焊盘 供应商设备封装:38-QFN（5x7） 包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
发布紧急采购，3分钟左右您将得到回复。