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參數(shù)資料
| 型號(hào)： | LTC1406IGN#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC A/D CONV 8BIT SAMPLING 24SSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 位數(shù)： | 8 |
| 采樣率（每秒）： | 20M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 225mW |
| 電壓電源： | 模擬和數(shù)字，雙 ± |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-SSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 2 個(gè)單端，雙極；1 個(gè)差分，雙極 |
8
LTC1406
where ENOB is the effective number of bits and S/(N + D)
is expressed in dB. At the maximum sampling rate of 20MHz
the LTC1406 maintains near ideal ENOBs up to and be-
yond the Nyquist input frequency of 10MHz (see Figure 3).
APPLICATIONS INFORMATION
WU
U
FREQUENCY (Hz)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
AMPLITUDE
(dB)
1406 F02a
0123
4
5
67
8
9
10
fSAMPLE = 20MHz
fIN1 = 1.000977MHz
SFDR = 64.8dB
SINAD = 48.6dB
Figure 2a. Nonaveraged, 4096 Point FFT
Input Frequency = 1MHz
Signal-to-Noise Ratio
The signal-to-noise plus distortion ratio [S/(N + D)] is the
ratio between the RMS amplitude of the fundamental input
frequency and the RMS amplitude of all other frequency
components at the ADC output. The output is band limited
to frequencies above DC to below half the sampling fre-
quency. The effective number of bits (ENOBs) is a mea-
surement of the resolution of an ADC and is directly related
to the S/(N + D) by the equation:
ENOB = [S/(N + D) – 1.76]/6.02
Figure 2b. Nonaveraged, 4096 Point FFT
Input Frequency = 30MHz
Total Harmonic Distortion
Total harmonic distortion 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
VV
=
+++
20
3
2
4
2
log
V
. . .V
V
2
n
2
1
where V1 is the RMS amplitude of the fundamental fre-
quency and V2 through Vn are the amplitudes of the sec-
ond through nth harmonics. THD vs Input Frequency is
shown in Figure 4. The LTC1406 has good distortion per-
formance up to the Nyquist frequency and beyond.
Intermodulation Distortion
If the ADC input signal consists of more than one spectral
component, the ADC transfer function nonlinearity can
produce intermodulation distortion (IMD) in addition to
THD. IMD is the change in one sinusoidal input caused by
the presence of another sinusoidal input at a different fre-
quency (see Figure 5).
INPUT FREQUENCY (Hz)
EFFECTIVE
BITS
S/(N
+
D)
(dB)
2
4
6
100k
1M
10M
100M
1406 TA02
0
3
5
7
1
850
44
38
32
Figure 3. Effective Bits and Signal-to-(Noise + Distortion)
vs Input Frequency
FREQUENCY (Hz)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
AMPLITUDE
(dB)
1406 F02b
0123
4
5
67
8
9
10
fSAMPLE = 20MHz
fIN1 = 28.99902MHz
SFDR = 54.9dB
SINAD = 47.0dB
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