参数资料
型号: LTC2381CMS-16#TRPBF
厂商: Linear Technology
文件页数: 4/24页
文件大小: 0K
描述: IC ADC 16BIT 1CH 250KSPS 16-MSOP
标准包装: 2,500
位数: 16
采样率(每秒): 250k
数据接口: 串行,SPI?
转换器数目: 1
功率耗散(最大): 4.25mW
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: 16-TFSOP(0.118",3.00mm 宽)
供应商设备封装: 16-MSOP
包装: 带卷 (TR)
输入数目和类型: 1 个差分,双极
配用: DC1571A-C-ND - BOARD SAR ADC LTC2381-16
LTC2381-16
12
238116f
APPLICATIONS INFORMATION
238116 F06
LT6350
R1 = 1k
R2 = 1k
R3 = 2k
R4 = 680Ω
VCM = VREF/2
VREF
75pF
150pF
0V to
2.5V
2.5V to
0V
0V to 5V
OUT1
RINT
10μF
RINT
RIN = 2k
OUT2
8
4
5
2
1
+
+
+
Figure 6. LT6350 Converting a 0V-5V Single-Ended Signal to
a ±2.5V Differential Input Signal
Figure 6a. 32k Point FFT Plot for Circuit Shown in Figure 6
238116 F07
LT6350
R1 = 1.24k
R2 = 1.24k
R3 = 10k
R4 = 1.1k
VCM = VREF/2
VCM
0V to
2.5V
2.5V to
0V
±10V
OUT1
RINT
RIN = 10k
OUT2
8
4
5
2
1
+
+
+
220pF
10μF
200pF
Table 1. SNR, THD vs RIN for 0-5V Single-Ended Input Signal
RIN
(Ω)
R1
(Ω)
R2
(Ω)
R3
(Ω)
R4
(Ω)
SNR
(dB)
THD
(dB)
2k
1k
2k
680
92
–100
10k
5k
10k
3.3k
91
–100
50k
25k
50k
16k
91
–97
Figure 7. LT6350 Converting a ±10V Single-Ended Signal to
a ±2.5V Differential Input Signal
Figure 7a. 32k Point FFT Plot for Circuit Shown in Figure 7
FREQUENCY (kHz)
0
25
50
75
100
125
–180
AMPLITUDE
(dBFS)
–60
–40
–20
–80
–100
–120
–140
–160
0
238116 F06a
SNR = 91.7dB
THD = –100dB
SINAD = 91.2dB
SFDR = 103.5dB
FREQUENCY (kHz)
0
25
50
75
100
125
–180
AMPLITUDE
(dBFS)
–60
–40
–20
–80
–100
–120
–140
–160
0
238116 F07a
SNR = 91.8dB
THD = –95.5dB
SINAD = 91.4dB
SFDR = 96.9dB
Table 2. SNR, THD vs RIN for ±10V Single-Ended Input Signal
RIN
(Ω)
R1
(Ω)
R2
(Ω)
R3
(Ω)
R4
(Ω)
SNR
(dB)
THD
(dB)
10k
1.24k
10k
1.1k
92
–96
50k
6.19k
50k
5.49k
91
–96
100k
12.4k
100k
11k
91
–97
ADC REFERENCE
The LTC2381-16 requires an external reference to define its
input range. A low noise, low temperature drift reference
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 LTC6652-2.5 is particularly well suited for
use with the LTC2381-16. The LTC6652-2.5 offers 0.05%
(max) initial accuracy and 5ppm/°C (max) temperature
coefficient for high precision applications. The LTC6652-2.5
is fully specified over the H-grade temperature range and
complements the extended temperature operation of the
LTC2381-16 up to 125°C. We recommend bypassing the
LTC6652-2.5 with a 47μF ceramic capacitor (X5R, 0805
size) close to the REF pin. All performance curves shown
in this datasheet were obtained using the LTC6652-2.5.
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