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參數(shù)資料
| 型號： | LTC1282BCSW#TR |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 3/24頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT SAMPLING REF 24SOIC |
| 標準包裝： | 1,000 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 140k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 24mW |
| 電壓電源： | 雙 ± |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-SOIC |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個單端，單極；1 個單端，雙極 |
11
LTC1282
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
DYNAMIC PERFORMANCE
The LTC1282 has exceptionally high speed sampling capa-
bility. FFT (Fast Fourier Transform) test techniques are
used to characterize the ADC’s frequency response, distor-
tion and noise at the rated throughput. By applying a low
distortion sine wave and analyzing the digital output using
an FFT algorithm, the ADC’s spectral content can be
examined for frequencies outside the fundamental. Figure
2 shows a typical LTC1282 FFT plot.
Signal-to-(Noise + Distortion) Ratio
The Signal-to-Noise plus Distortion Ratio [S/(N + D)] is the
ratio between the RMS amplitude of the fundamental input
frequency to the RMS amplitude of all other frequency
components at the A/D output. The output is band limited
to frequencies from above DC and below half the sampling
frequency. Figure 2 shows a typical LTC1282 FFT plot.
Figure 2. LTC1282 Nonaveraged, 1024 Point FFT Plot
INPUT FREQUENCY (Hz)
2
EFFECTIVE
NUMBER
OF
BITS
(ENOBs)
4
6
8
10
1k
100k
1M
10M
LTC1282 F03
0
10k
12
1
3
5
7
9
11
50
62
74
56
68
S/(N
+
D)
(dB)
fSAMPLE = 160kHz
VS = ±2.7V BIPOLAR
BIPOLAR
(±1.25V
INPUT)
Total Harmonic Distortion
Total Harmonic Distortion (THD) is the ratio of the RMS
sum of all harmonics of the input signal to the fundamental
itself. The out-of-band harmonics alias into the frequency
band between DC and half the sampling frequency. THD is
expressed as:
THD = 20log
√V
2
2 + V32 + V42 ... + VN2
V1
where V1 is the RMS amplitude of the fundamental fre-
quency and V2 through VN are the amplitudes of the
second through Nth harmonics. The typical THD specifi-
cation in the Dynamic Accuracy table includes the 2nd
through 5th harmonics. With a 70kHz input signal, the
LTC1282 has a typical – 82dB THD as shown in Figure 4.
Figure 3. ENOBs and S/(N + D) vs Input Frequency
INPUT FREQUENCY (Hz)
–80
AMPLITUDE
(dB
BELOW
THE
FUNDAMENTAL)
–60
–40
–20
0
1k
100k
1M
10M
LTC1282 F04
–100
10k
–90
–70
–50
–30
–10
2nd HARMONIC
THD
fSAMPLE = 140kHz
±3V SUPPLIES
BIPOLAR
3rd HARMONIC
Figure 4. Distortion vs Input Frequency (Bipolar)
Effective Number of Bits
The Effective Number of Bits (ENOBs) is a measurement of
the resolution of an ADC and is directly related to
S/(N + D) by the equation:
N = [S/(N + D) – 1.76]/6.02
where N is the Effective Number of Bits of resolution and
S/(N + D) is expressed in dB. At the maximum sampling
rate of 140kHz the LTC1282 maintains 11.3 ENOBs at
70kHz input frequency. Refer to Figure 3.
FREQUENCY (kHz)
0
AMPLITUDE
(dB)
20
40
60
80
LT1282 F02
0
–20
–40
–60
–80
–100
–120
10
30
50
70
fSAMPLE = 160kHz
VDD = 3V
UNIPOLAR
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