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參數(shù)資料
型號(hào)： DC1783A-F
廠商： Linear Technology
文件頁(yè)數(shù)： 4/24頁(yè)
文件大小： 0K
描述： BOARD SAR ADC LTC2378-18
軟件下載： QuikEval II System
設(shè)計(jì)資源： DC1783A Design Files
DC1783A Schematic
標(biāo)準(zhǔn)包裝： 1
系列： QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 18
采樣率（每秒）： 1M
數(shù)據(jù)接口： 串行，SPI?
輸入范圍： ±VREF
在以下條件下的電源（標(biāo)準(zhǔn)）： 13.5mW @ 1MSPS
工作溫度： 0°C ~ 70°C
已用 IC / 零件： LTC2378-18
已供物品： 板
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LTC2378-18
12
237818f
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
101.3
–100
10k
2.49k
10k
2k
101
–92
100k
24.9k
100k
20k
98.9
–97
Fully Differential Inputs
To achieve the full distortion performance of the
LTC2378-18, 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
237818 F06a
OUT1
RINT
RIN = 2k
OUT2
8
4
5
2
1
+
–
+
–
+
220pF
10μF
200pF
0V
5V
–10V
10V
0V
5V
Digital Gain Compression
The LTC2378-18 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
237818 F06b
SNR = 101.3dB
THD = –100.4dB
SINAD = 98.3dB
SFDR = 102.6dB
FREQUENCY (kHz)
0
100
200
300
500
400
LT6203
237818 F07
0V
5V
0V
5V
3
1
2
+
–
0V
5V
5
7
6
+
–
0V
5V
LT6350
VCM = VREF/2
237818 F05a
0V
5V
0V
5V
OUT1
RINT
OUT2
8
4
5
2
1
+
–
+
–
+
0V
5V
FREQUENCY (kHz)
0
100
200
300
400
500
–180
AMPLITUDE
(dBFS)
–60
–40
–20
–80
–100
–120
–140
–160
0
237818 F05b
SNR = 101.7dB
THD = –108.4dB
SINAD = 101.1dB
SFDR = 108.8dB
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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