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| 型号： | DC1783A-G |
| 厂商： | Linear Technology |
| 文件页数： | 4/24页 |
| 文件大小： | 0K |
| 描述： | BOARD SAR ADC LTC2377-18 |
| 软件下载： | QuikEval II System |
| 设计资源： | DC1783A Design Files DC1783A Schematic |
| 标准包装： | 1 |
| 系列： | QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 18 |
| 采样率（每秒）： | 500k |
| 数据接口： | 串行，SPI? |
| 输入范围： | ±VREF |
| 在以下条件下的电源（标准）： | 6.8mW @ 500kSPS |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2377-18 |
| 已供物品： | 板 |
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LTC2377-18
12
237718f
R1, R2, R3 and R4 must be selected in relation to RIN to
achieve the desired attenuation and to maintain a balanced
input impedance in the first amplifier. Table 1 shows the
resulting SNR and THD for several values of RIN, R1, R2,
R3 and R4 in this configuration. Figure 6b shows the re-
sulting FFT when using the LT6350 as shown in Figure 6a.
Table 1. SNR, THD vs RIN for ±10V Single-Ended Input Signal.
RIN
(Ω)
R1
(Ω)
R2
(Ω)
R3
(Ω)
R4
(Ω)
SNR
(dB)
THD
(dB)
2k
499
2k
402
100.9
–100
10k
2.49k
10k
2k
100.8
–92
100k
24.9k
100k
20k
100.7
–98
Fully Differential Inputs
To achieve the full distortion performance of the
LTC2377-18, a low distortion fully differential signal source
driven through the LT6203 configured as two unity gain
buffers as shown in Figure 7 can be used to get the full
data sheet THD specification of –124dB.
APPLICATIONS INFORMATION
LT6350
R1 = 499Ω
R2 = 499Ω
R3 = 2k
R4 = 402Ω
VCM = VREF/2
VCM
237718 F06a
OUT1
RINT
RIN = 2k
OUT2
8
4
5
2
1
+
–
+
–
+
220pF
10μF
200pF
0V
5V
–10V
10V
0V
5V
Digital Gain Compression
The LTC2377-18 offers a digital gain compression (DGC)
feature which defines the full-scale input swing to be be-
tween 10% and 90% of the ±VREF analog input range. To
enable digital gain compression, bring the REF/DGC pin
low. This feature allows the LT6350 to be powered off of
a single +5.5V supply since each input swings between
0.5V and 4.5V as shown in Figure 8. Needing only one
Figure 6a. LT6350 Converting a ±10V Single-Ended Signal to
a ±5V Differential Input Signal
Figure 6b. 32k Point FFT Plot with fIN = 2kHz
for Circuit Shown in Figure 6a
Figure 7. LT6203 Buffering a Fully Differential Signal Source
–180
AMPLITUDE
(dBFS)
–60
–40
–20
–80
–100
–120
–140
–160
0
237718 F06b
SNR = 100.9dB
THD = –100.3dB
SINAD = 98.1dB
SFDR = 102.3dB
FREQUENCY (kHz)
0
50
100
150
250
200
LT6203
237718 F07
0V
5V
0V
5V
3
1
2
+
–
0V
5V
5
7
6
+
–
0V
5V
LT6350
VCM = VREF/2
237718 F05a
0V
5V
0V
5V
OUT1
RINT
OUT2
8
4
5
2
1
+
–
+
–
+
0V
5V
FREQUENCY (kHz)
0
50
100
250
200
150
–180
AMPLITUDE
(dBFS)
–60
–40
–20
–80
–100
–120
–140
–160
0
237718 F05b
SNR = 101.2dB
THD = –108.2dB
SINAD = 100.6dB
SFDR = 108.5dB
Figure 5a. LT6350 Converting a 0V-5V Single-Ended
Signal to a ±5V Differential Input Signal
Figure 5b. 32k Point FFT Plot with fIN = 2kHz
for Circuit Shown in Figure 5a
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