參數資料
型號： LTC2380IMS-16#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： SUCCESSIVE APPROXIMATION ADC, PDSO16
封裝： LEAD FREE, PLASTIC, MSOP-16
文件頁數： 4/24頁
文件大小： 545K
代理商： LTC2380IMS-16#PBF
LTC2380-16
12
238016f
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
96
–93
10k
2.49k
10k
2k
96
–96
100k
24.9k
100k
20k
93
–97
Fully Differential Inputs
To achieve the full distortion performance of the
LTC2380-16,alowdistortionfullydifferentialsignalsource
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 –117dB.
applicaTions inForMaTion
LT6350
R1 = 499
R2 = 499
R3 = 2k
R4 = 402
VCM = VREF/2
VCM
238016 F06a
OUT1
RINT
RIN = 2k
OUT2
8
4
5
2
1
+–
+
–
+
220pF
10F
200pF
0V
5V
–10V
10V
0V
5V
Digital Gain Compression
The LTC2380-16 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
238016 F06b
SNR = 96dB
THD = –93dB
SINAD = 91.2dB
SFDR = 94.3dB
FREQUENCY (kHz)
0 100 200 300 400
1000
900
800
700
600
500
LT6203
238016 F07
0V
5V
0V
5V
3
1
2
+
–
0V
5V
5
7
6
+
–
0V
5V
LT6350
VCM = VREF/2
238016 F05a
0V
5V
0V
5V
OUT1
RINT
OUT2
8
4
5
2
1
+–
+
–
+
0V
5V
FREQUENCY (kHz)
0 100 200 300 400
1000
800 900
700
600
500
–180
AMPLITUDE
(dBFS)
–60
–40
–20
–80
–100
–120
–140
–160
0
238016 F05b
SNR = 96.1dB
THD = –104.7dB
SINAD = 95.5dB
SFDR = 108dB
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
相關PDF資料
PDF描述
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