參數(shù)資料
型號(hào)： LTC2380IDE-16#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 5/26頁(yè)
文件大?。?/td> 0K
描述： IC ADC 16BIT 2MSPS 16-DFN
產(chǎn)品培訓(xùn)模塊： LTC2379- 18-/16-bit Fully-Differential SAR ADC Family Overview
標(biāo)準(zhǔn)包裝： 2,500
位數(shù)： 16
采樣率（每秒）： 2M
數(shù)據(jù)接口： 串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 22mW
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-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： *
配用： DC1783A-A-ND - BOARD SAR ADC LTC2380-16
LTC2380-16
13
238016fa
–180
AMPLITUDE
(dBFS)
–60
–40
–20
–80
–100
–120
–140
–160
0
238016 F09b
SNR = 94.6dB
THD = –94.6dB
SINAD = 91.6dB
SFDR = 95.9dB
FREQUENCY (kHz)
0 100 200 300 400
1000
900
800
700
600
500
Figure 9b. 32k Point FFT Plot with
fIN = 2kHz for Circuit Shown in
Figure 9a
Figure 8. Input Swing of the LTC2380 with Gain
Compression Enabled
APPLICATIONS INFORMATION
positive supply to power the LT6350 results in additional
power savings for the entire system.
Figure 9a shows how to configure the LT6350 to accept a
±10V true bipolar input signal and attenuate and level shift
the signal to the reduced input range of the LTC2380-16
when digital gain compression is enabled. Figure 9b shows
an FFT plot with the LTC2380-16 being driven by the LT6350
with digital gain compression enabled.
ADC REFERENCE
The LTC2380-16 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 LTC2380-16. 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
LTC2380-16 up to 125°C. We recommend bypassing the
LTC6655-5 with a 47μF ceramic capacitor (X5R, 0805 size)
close to the REF pin.
The REF pin of the LTC2380-16 draws charge (QCONV) from
the 47μF 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 LTC2380-16 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 LTC2380-16 draws only
a small leakage current (< 1μA). In applications where a
burst of samples is taken after idling for long periods as
shown in Figure 10, IREF quickly goes from approximately
CNV
IDLE
PERIOD
IDLE
PERIOD
238016 F10
Figure 10. CNV Waveform Showing Burst Sampling
Figure 9a. LT6350 Configured to Accept a ±10V Input Signal While Running Off of a
Single 5.5V Supply When Digital Gain Compression Is Enabled in the LTC2380-16
238016 F08
5V
4.5V
0.5V
0V
5V
5.5V
LTC6655-5
VIN
VOUT_S
VOUT_F
LT6350
3.01k
4.32k
VCM
238016 F09a
OUT1
RINT
RIN = 15k
OUT2
V–
8
4
5
2
1
6
V+
3
+
–
+
20Ω
3300pF
20Ω
6.04k
1k
VCM
1k
0.5V
4.5V
0.5V
4.5V
47μF
10μF
LTC2380-16
REF/DGC
IN+
REF
VDD
2.5V
IN–
–10V
10V
0V
3300pF
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