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参数资料
| 型号： | LTC2378IMS-16#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | ADC |
| 英文描述： | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16 |
| 封装： | LEAD FREE, PLASTIC, MSOP-16 |
| 文件页数： | 4/24页 |
| 文件大小： | 755K |
| 代理商： | LTC2378IMS-16#TRPBF |
LTC2378-16
12
237816f
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
96.3
–101
10k
2.49k
10k
2k
96.3
–92
100k
24.9k
100k
20k
96.3
–98
Fully Differential Inputs
To achieve the full distortion performance of the
LTC2378-16,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 –122dB.
applicaTions inForMaTion
LT6350
R1 = 499
R2 = 499
R3 = 2k
R4 = 402
VCM = VREF/2
VCM
237816 F06a
OUT1
RINT
RIN = 2k
OUT2
8
4
5
2
1
+–
+
–
+
220pF
10F
200pF
0V
5V
–10V
10V
0V
5V
Digital Gain Compression
The LTC2378-16 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
237816 F06b
SNR = 96.3dB
THD = –100.9dB
SINAD = 95.2dB
SFDR = 103.3dB
FREQUENCY (kHz)
0
100
200
300
400
500
LT6203
237816 F07
0V
5V
0V
5V
3
1
2
+
–
0V
5V
5
7
6
+
–
0V
5V
LT6350
VCM = VREF/2
237816 F05a
0V
5V
0V
5V
OUT1
RINT
OUT2
8
4
5
2
1
+–
+
–
+
0V
5V
FREQUENCY (kHz)
0
100
200
300
500
400
–180
AMPLITUDE
(dBFS)
–60
–40
–20
–80
–100
–120
–140
–160
0
237816 F05b
SNR = 96.5dB
THD = –108.7dB
SINAD = 96.2dB
SFDR = 109.4dB
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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