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參數(shù)資料
| 型號(hào)： | LTC1406CGN#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 16/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC A/D CONV 8BIT SAMPLING 24SSOP |
| 標(biāo)準(zhǔn)包裝： | 55 |
| 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： | 0°C ~ 70°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： | 管件 |
| 輸入數(shù)目和類型： | 2 個(gè)單端，雙極；1 個(gè)差分，雙極 |
9
LTC1406
APPLICATIONS INFORMATION
WU
U
If two pure sine waves of frequencies fa and fb are applied
to the ADC input, nonlinearities in the ADC transfer func-
tion can create distortion products at the sum and differ-
ence frequencies of mfa ±nfb, where m and n = 0, 1, 2, 3,
etc. For example, the 2nd order IMD terms include (fa ±fb).
If the two input sine waves are equal in magnitude, the
value (in decibels) of the 2nd order IMD products can be
expressed by the following formula:
IMD f
f
Amplitude at
ab
b
±
()=
±
()
20 log
Amplitude at f
f
a
Peak Harmonic or Spurious Noise
The peak harmonic or spurious noise is the largest spec-
tral component excluding the input signal and DC. This
value is expressed in decibel relative to the RMS value of
a full-scale input signal (see Figure 6).
Input Bandwidth
The input bandwidth is that input frequency at which the
amplitude of the reconstructed fundamental is reduced by
3dB for a full-scale input signal. The LTC1406 has been
designed for wide input bandwidth (250MHz), allowing
the ADC to undersample input signals with frequencies
above the converter’s Nyquist frequency. The noise floor
stays very low at high frequencies; S/(N + D) becomes
dominated by distortion at frequencies far beyond Nyquist.
Analog Inputs
The LTC1406 has a unique differential sample-and-hold
circuit that allows rail-to-rail inputs. The AIN
+ and AIN–
inputs are sampled at the same time and the ADC will
always convert the difference of [(AIN
+) – (AIN–)] indepen-
dent of the common mode voltage. Any unwanted signal
that is common to both inputs will be rejected by the com-
mon mode rejection of the sample-and-hold circuit. The
common mode rejection holds up to extremely high fre-
quencies (see Figure 7).
The inputs can be driven differentially or single-ended. In
differential mode, both inputs are driven
±0.5V out of
phase with each other. In single-ended mode, the nega-
tive input is tied to a fixed voltage and AIN
+ is used as the
Figure 6. Spurious-Free Dynamic Range vs
Input Frequency
INPUT FREQUENCY (Hz)
100k
SPURIOUS-FREE
DYNAMIC
RANGE
(dB)
70
60
50
40
30
20
10
0
1M
10M
100M
1406 G04
INPUT FREQUENCY (Hz)
100k
AMPLITUDE
(dB
BELOW
THE
FUNDAMENTAL)
0
–10
–20
–30
–40
–50
–60
–70
–80
1M
10M
100M
1406 G03
THD
3RD HARMONIC
2ND HARMONIC
Figure 4. Distortion vs Input Frequency
FREQUENCY (MHz)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
AMPLITUDE
(dB)
1406 G05
0123
4
5
67
8
9
10
fSAMPLE = 20MHz
fIN1 = 3.500977MHz
fIN2 = 3.598633MHz
Figure 5. Intermodulation Distortion Plot
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