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参数资料
| 型号： | DC1571A-C |
| 厂商： | Linear Technology |
| 文件页数： | 4/24页 |
| 文件大小： | 0K |
| 描述： | BOARD SAR ADC LTC2381-16 |
| 软件下载： | QuikEval II System |
| 设计资源： | DC1571A Design Files DC1571A Schematic |
| 标准包装： | 1 |
| 系列： | QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 250k |
| 数据接口： | 串行，SPI? |
| 输入范围： | ±2.5 V |
| 在以下条件下的电源（标准）： | 3.25mW @ 250kSPS |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2381-16 |
| 已供物品： | 板 |
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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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