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參數資料
| 型號： | 6204I |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Rail-to-Rail Input and Output, Ultralow 1.9n Root Hz Noise, Low Power Op Amps |
| 中文描述： | 軌到軌輸入和輸出，超低1.9n根赫茲噪聲，低功耗運算放大器 |
| 文件頁數： | 18/24頁 |
| 文件大小： | 587K |
| 代理商： | 6204I |
LT6202/LT6203/LT6204
18
620234fa
Single-Supply 16-Bit ADC Driver
Figure 5 shows the LT6203 driving an LTC1864 unipolar
16-bit A/D converter. The bottom half of the LT6203 is in
a gain-of-one configuration and buffers the 0V negative
full-scale signal V
LOW
into the negative input of the
LTC1864. The top half of the LT6203 is in a gain-of-ten
configuration referenced to the buffered voltage V
LOW
and
drives the positive input of the LTC1864. The input range
of the LTC1864 is 0V to 5V, but for best results the input
range of V
IN
should be from V
LOW
(about 0.4V) to about
0.82V. Figure 6 shows an FFT obtained with a 10.1318kHz
coherent input waveform, from 8192 samples with no
windowing or averaging. Spurious free dynamic range is
seen to be about 100dB.
TYPICAL APPLICATIO S
Although the LTC1864 has a sample rate far below the gain
bandwidth of the LT6203, using this amplifier is not
necessarily a case of overkill. The designer is reminded
that A/D converters have sample apertures that are vanish-
ingly small (ideally, infinitesimally small) and make de-
mands on the upstream circuitry far in excess of what is
implied by the innocent-looking sample rate. In addition,
when an A/D converter takes a sample, it applies a small
capacitor to its inputs with a fair amount of glitch energy
and expects the voltage on the capacitor to settle to the
true value very quickly. Finally, the LTC1864 has a 20MHz
analog input bandwidth and can be used in undersampling
applications, again requiring a source bandwidth higher
than Nyquist.
–
+
–
+
–
+
LTC1864
16-BIT
250ksps
5V
SERIAL
DATA
OUT
C1
470pF
R3
100
R4
100
R1
1k
R2
110
V
IN
= 0.6V
DC
±
200mV
AC
V
LOW
= 0.4V
DC
1/2 LT6203
1/2 LT6203
LT6202/03/04 F05
FREQUENCY (kHz)
0
S
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
37.5
62.5
100
LT6202/03/04 F06
12.5 25
50
75 82.5
112.5125
f
S
= 250ksps
f
IN
= 10.131836kHz
Figure 5. Single-Supply 16-Bit ADC Driver
Figure 6. FFT Showing 100dB SFDR
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