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參數(shù)資料
| 型號： | LTC2368CDE-18#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 4/24頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT 1M 1CH 16DFN |
| 產(chǎn)品培訓(xùn)模塊： | LTC2369- 18-/16-bit Pseudo-Differential SAR ADC Family Overview |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 位數(shù)： | 18 |
| 采樣率（每秒）： | 1M |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 15.8mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 16-DFN（4x3） |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個偽差分，單極 |
| 配用： | DC1813A-F-ND - BOARD SAR ADC LTC2368-18 |
LTC2368-18
12
236818f
Table 1. SNR, THD vs RIN for ±10V Input Signal
RIN
(Ω)
R1
(Ω)
R2
(Ω)
R3
(Ω)
R4
(Ω)
SNR
(dB)
THD
(dB)
2k
499
2k
402
96.9
–99.3
10k
2.49k
10k
2k
96.8
–94
100k
24.9k
100k
20k
94.8
–93.8
APPLICATIONS INFORMATION
ADC REFERENCE
The LTC2368-18 requires an external reference to define
its input range. A low noise, low temperature drift refer-
ence is critical to achieving the full datasheet performance
of the ADC. Linear Technology offers a portfolio of high
performance references designed to meet the needs of
many applications. With its small size, low power and
high accuracy, the LTC6655-5 is particularly well suited for
use with the LTC2368-18. The LTC6655-5 offers 0.025%
(max) initial accuracy and 2ppm/°C (max) temperature
coefficient for high precision applications. The LTC6655-5
is fully specified over the H-grade temperature range and
complements the extended temperature operation of the
LTC2368-18 up to 125°C. We recommend bypassing the
LTC6655-5witha47Fceramiccapacitor(X5R,0805size)
close to the REF pin.
TheREFpinoftheLTC2368-18drawscharge(QCONV)from
the 47F bypass capacitor during each conversion cycle.
The reference replenishes this charge with a DC current,
IREF = QCONV/tCYC. The DC current draw of the REF pin,
IREF, depends on the sampling rate and output code. If
the LTC2368-18 is used to continuously sample a signal
at a constant rate, the LTC6655-5 will keep the deviation
of the reference voltage over the entire code span to less
than 0.5LSBs.
When idling, the REF pin on the LTC2368-18 draws only
a small leakage current (< 1A). In applications where a
burst of samples is taken after idling for long periods as
shown in Figure 6, IREF quickly goes from approximately
0A to a maximum of 0.7mA at 1Msps. This step in DC
current draw triggers a transient response in the reference
that must be considered since any deviation in the refer-
ence output voltage will affect the accuracy of the output
Figure 6. CNV Waveform Showing Burst Sampling
Figure 5a. LT6202 Converting a ±10V Bipolar Signal
to a 0V to 5V Input Signal
Figure 5b. 32k Point FFT Plot with fIN = 2kHz
for Circuit Shown in Figure 5a
–
+
1
3
4
LT6202
R4
402
R1
499
RIN
2k
R3
2k
R2
499
10F
10V
–10V
0V
200pF
VCM = VREF/2
5V
0V
236818 F05a
FREQUENCY (kHz)
0
AMPLITUDE
(dBFS) –80
–60
–40
236818 F05b
–100
–120
–180
–160
200
400
100
300
500
–140
0
–20
SNR = 96.9dB
THD = –99.3dB
SINAD = 93.9dB
SFDR = 99.8dB
CNV
IDLE
PERIOD
IDLE
PERIOD
236818 F06
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