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參數(shù)資料
| 型號： | DC1571A-A |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 4/24頁 |
| 文件大小： | 0K |
| 描述： | BOARD SAR ADC LTC2383-16 |
| 軟件下載： | QuikEval II System |
| 設計資源： | DC1571A Design Files DC1571A Schematic |
| 標準包裝： | 1 |
| 系列： | QuikEval™ |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 1M |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 輸入范圍： | ±2.5 V |
| 在以下條件下的電源（標準）： | 13mW @ 1MSPS |
| 工作溫度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2383-16 |
| 已供物品： | 板 |
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LTC2383-16
12
238316f
The LT6350 can also be used to buffer and convert single-
ended signals larger than the input range of the LTC2383-16
in order to maximize the signal swing that can be digitized.
Figure 6 shows the LT6350 converting a 0V-5V single-ended
input signal to the ±2.5V differential input range of the
LTC2383-16. In this case, the first amplifier in the LT6350
is configured as an inverting amplifier stage, which acts to
attenuate the input signal down to the 0V-2.5V input range
of the LTC2383-16. In the inverting amplifier configuration,
the single-ended input signal source no longer directly
drives a high impedance input of the first amplifier. The
input impedance is instead set by resistor RIN. RIN must
be chosen carefully based on the source impedance of the
signal source. Higher values of RIN tend to degrade both
the noise and distortion of the LT6350 and LTC2383-16 as a
system. R1, R2 and R3 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
APPLICATIONS INFORMATION
LT6350
R1 = 1k
R2 = 1k
R3 = 2k
R4 = 665Ω
VCM = VREF/2
VREF
75pF
150pF
0V to
2.5V
2.5V to
0V
0V to 5V
238316 F06
OUT1
RINT
10μF
RINT
RIN = 2k
OUT2
8
4
5
2
1
+
–
+
–
+
Figure 6. LT6350 Converting a 0V-5V Single-Ended Signal to
a ±2.5V Differential Input Signal
Figure 6a. 32k Point FFT Plot for Circuit Shown in Figure 6
LT6350
R1 = 1.24k
R2 = 1.24k
R3 = 10k
R4 = 1.1k
VCM = VREF/2
VCM
0V to
2.5V
2.5V to
0V
±10V
238316 F07
OUT1
RINT
RIN = 10k
OUT2
8
4
5
2
1
+
–
+
–
+
220pF
10μF
200pF
resulting SNR and THD for several values of RIN, R1, R2
and R3 in this configuration. Figure 6a shows the resulting
FFT when using the LT6350 as shown in Figure 6.
The LT6350 can also be used to buffer and convert large,
true bipolar signals which swing below ground to the ±2.5V
differential input range of the LTC2383-16. Figure 7 shows
the LT6350 being used to convert a ±10V true bipolar signal
for use by the LTC2383-16. The input impedance is again
set by resistor RIN. Table 2 shows the resulting SNR and
THD for several values of RIN. Figure 7a shows the resulting
FFT when using the LT6350 as shown in Figure 7.
Table 1. SNR, THD vs RIN for 0-5V Single-Ended Input Signal.
RIN
(Ω)
R1
(Ω)
R2
(Ω)
R3
(Ω)
R4
(Ω)
SNR
(dB)
THD
(dB)
2k
1k
2k
665
92
–101
10k
5k
10k
3.3k
91
–100
100k
50k
100k
16k
91
–94
Figure 7. LT6350 Converting a ±10V Single-Ended Signal to
a ±2.5V Differential Input Signal
Figure 7a. 32k Point FFT Plot for Circuit Shown in Figure 7
FREQUENCY (kHz)
0
100
200
300
400
500
–180
AMPLITUDE
(dBFS)
–60
–40
–20
–80
–100
–120
–140
–160
0
238316 F06a
SNR = 92dB
THD = –101dB
SINAD = 91.4dB
SFDR = 103dB
FREQUENCY (kHz)
0
100
200
300
400
500
–180
AMPLITUDE
(dBFS)
–60
–40
–20
–80
–100
–120
–140
–160
0
238316 F07a
SNR = 92dB
THD = –97dB
SINAD = 91.2dB
SFDR = 99.7dB
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