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参数资料
| 型号： | LTC2368IDE-18#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT 1M 1CH 16DFN |
| 产品培训模块： | LTC2369- 18-/16-bit Pseudo-Differential SAR ADC Family Overview |
| 标准包装： | 2,500 |
| 位数： | 18 |
| 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）： | 15.8mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFDFN 裸露焊盘 |
| 供应商设备封装： | 16-DFN（4x3） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个伪差分，单极 |
| 配用： | DC1813A-F-ND - BOARD SAR ADC LTC2368-18 |
LTC2368-18
13
236818f
APPLICATIONS INFORMATION
code. In applications where the transient response of the
reference is important, the fast settling LTC6655-5 refer-
ence is also recommended.
In applications where power management is critical and
the external reference may be powered down, it is rec-
ommended that REF is kept greater than 2V in order to
guaranteeamaximumshutdowncurrentof140A.Insuch
applications, a Schottky diode can be placed between REF
and VDD, as shown in Figure 7.
the RMS amplitude of all other frequency components
except the first five harmonics and DC. Figure 8 shows
that the LTC2368-18 achieves a typical SNR of 97.2dB at
a 1MHz sampling rate with a 2kHz input.
Total Harmonic Distortion (THD)
TotalHarmonicDistortion(THD)istheratiooftheRMSsum
ofallharmonicsoftheinputsignaltothefundamentalitself.
The out-of-band harmonics alias into the frequency band
between DC and half the sampling frequency (fSMPL/2).
THD is expressed as:
THD
=20log
V22
+ V32 + V42 +…+ VN
2
V1
where V1 is the RMS amplitude of the fundamental fre-
quencyandV2throughVNaretheamplitudesofthesecond
through Nth harmonics.
POWER CONSIDERATIONS
The LTC2368-18 provides two power supply pins: the
2.5V power supply (VDD), and the digital input/output
interface power supply (OVDD). The flexible OVDD supply
allows the LTC2368-18 to communicate with any digital
logic operating between 1.8V and 5V, including 2.5V and
3.3V systems.
Figure 8. 32k Point FFT with fIN = 2kHz of the LTC2368-18
REF
236818 F07
LTC2368-18
VDD
Figure 7. A Schottky Diode Between REF and VDD Maintains
REF > 2V for Applications Where the Reference May Be
Powered Down
DYNAMIC PERFORMANCE
Fast Fourier Transform (FFT) 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 frequen-
cies outside the fundamental. The LTC2368-18 provides
guaranteed tested limits for both AC distortion and noise
measurements.
Signal-to-Noise and Distortion Ratio (SINAD)
The signal-to-noise and distortion ratio (SINAD) is the
ratio between the RMS amplitude of the fundamental input
frequency and 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 8 shows that the LTC2368-18 achieves
a typical SINAD of 97.1dB at a 1MHz sampling rate with
a 2kHz input.
Signal-to-Noise Ratio (SNR)
The signal-to-noise ratio (SNR) is the ratio between the
RMS amplitude of the fundamental input frequency and
FREQUENCY (kHz)
0
100
200
300
400
500
–180
AMPLITUDE
(dBFS)
–60
–40
–20
–80
–100
–120
–140
–160
0
236818 F08
SNR = 97.2dB
THD = –120dB
SINAD = 97.1dB
SFDR = 120dB
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| LTC2368IMS-16#TRPBF | 功能描述:IC ADC 16BIT SPI/SRL 1M 16-MSOP 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:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
| LTC2368IMS-18#PBF | 功能描述:IC ADC 18BIT 1M 1CH 16MSOP 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:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
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