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| 型号： | DC1813A-A |
| 厂商： | Linear Technology |
| 文件页数： | 4/24页 |
| 文件大小： | 0K |
| 描述： | BOARD SAR ADC LTC2370-16 |
| 软件下载： | QuikEval II System |
| 设计资源： | DC1813A Design File DC1813A Schematic |
| 标准包装： | 1 |
| 系列： | QuikEval-II™ |
| ADC 的数量： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 2M |
| 数据接口： | 串行，SPI? |
| 输入范围： | 0 ~ VREF |
| 在以下条件下的电源（标准）： | 19mW @ 2MSPS |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2370-16 |
| 已供物品： | 板 |
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LTC2370-16
12
237016fa
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
93.9
–97.8
10k
2.49k
10k
2k
94
–92.9
100k
24.9k
100k
20k
92.2
–93.2
APPLICATIONS INFORMATION
ADC REFERENCE
The LTC2370-16 requires an external reference to define
its input range. A low noise, low temperature drift refer-
ence is critical to achieving the full data sheet 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 LTC2370-16. 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
LTC2370-16 up to 125°C. We recommend bypassing the
LTC6655-5witha47Fceramiccapacitor(X5R,0805size)
close to the REF pin.
TheREFpinoftheLTC2370-16drawscharge(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 LTC2370-16 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 LTC2370-16 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 1.3mA at 2Msps. 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
237016 F05a
FREQUENCY (kHz)
0
AMPLITUDE
(dBFS) –80
–60
–40
1000
800 900
237016 F05b
–100
–120
–180
–160
200
400
600
100
300
500
700
–140
0
–20
SNR = 93.9dB
THD = –97.8dB
SINAD = 91.4dB
SFDR = 99.6dB
CNV
IDLE
PERIOD
IDLE
PERIOD
237016 F06
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