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參數(shù)資料
| 型號： | LTC2364IMS-18#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 5/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 18BIT 250K 1CH 16MSOP |
| 產(chǎn)品培訓(xùn)模塊： | LTC2369- 18-/16-bit Pseudo-Differential SAR ADC Family Overview |
| 標(biāo)準(zhǔn)包裝： | 37 |
| 位數(shù)： | 18 |
| 采樣率（每秒）： | 250k |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 4.25mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-TFSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-MSOP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個偽差分，單極 |
| 配用： | DC1813A-H-ND - BOARD SAR ADC LTC2364-18 |
LTC2364-18
13
236418f
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 LTC2364-18 achieves a typical SNR of 97.2dB at
a 250kHz 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 LTC2364-18 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 LTC2364-18 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 LTC2364-18
FREQUENCY (kHz)
0
25
50
75
100
125
–180
AMPLITUDE
(dBFS)
–60
–40
–20
–80
–100
–120
–140
–160
0
236418 F08
SNR = 97.2dB
THD = –121dB
SINAD = 97.2dB
SFDR = 125dB
REF
236418 F07
LTC2364-18
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 LTC2364-18 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 LTC2364-18 achieves
a typical SINAD of 97.2dB at a 250kHz 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
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