APPLICATIONS INFOR
參數(shù)資料
型號: LTC1419CG#PBF
廠商: Linear Technology
文件頁數(shù): 19/20頁
文件大?。?/td> 0K
描述: IC A/D CONV 14BIT SAMPLNG 28SSOP
標(biāo)準(zhǔn)包裝: 47
位數(shù): 14
采樣率(每秒): 800k
數(shù)據(jù)接口: 并聯(lián)
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 240mW
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: 28-SSOP(0.209",5.30mm 寬)
供應(yīng)商設(shè)備封裝: 28-SSOP
包裝: 管件
輸入數(shù)目和類型: 2 個單端,雙極;1 個差分,雙極
8
LTC1419
1419fb
APPLICATIONS INFORMATION
WU
U
frequencies outside the fundamental. Figure 2 shows a
typical LTC1419 FFT plot.
Effective Number of Bits
The effective number of bits (ENOBs) is a measurement of
the resolution of an ADC and is directly related to the
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 800kHz, the LTC1419 maintains near ideal ENOBs
up to the Nyquist input frequency of 400kHz (refer to
Figure 3).
FREQUENCY (kHz)
0
AMPLITUDE
(dB)
–60
–40
–20
300
1419 F02a
–80
–100
100
200
400
250
50
150
350
–120
–140
0
fSAMPLE = 800kHz
fIN = 99.804687kHz
SFDR = 98dB
THD = –93.3dB
Figure 2a. LTC1419 Nonaveraged, 4096 Point FFT,
Input Frequency = 100kHz
FREQUENCY (kHz)
0
AMPLITUDE
(dB)
–60
–40
–20
300
1419 F02b
–80
–100
100
200
400
250
50
150
350
–120
–140
0
fSAMPLE = 800kHz
fIN = 375kHz
SFDR = 88.3dB
SINAD = 80.1
Figure 2b. LTC1419 Nonaveraged, 4096 Point FFT,
Input Frequency = 375kHz
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 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 spectral content with
a 800kHz sampling rate and a 100kHz input. The dynamic
performance is excellent for input frequencies up to and
beyond the Nyquist limit of 400kHz.
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
Log
VVV
Vn
V
=
++
+…
20
23
4
1
22
2
where V1 is the RMS amplitude of the fundamental fre-
quency and V2 through Vn are the amplitudes of the
second through nth harmonics. THD vs Input Frequency is
shown in Figure 4. The LTC1419 has good distortion
performance up to the Nyquist frequency and beyond.
INPUT FREQUENCY (Hz)
1k
EFFECTIVE
BITS
SIGNAL/(NOISE
+
DISTORTION)
(dB)
14
13
12
11
10
9
8
7
6
5
4
3
2
86
80
74
68
62
10k
100k
1419 TA02
1M
2M
fSAMPLE = 800kHz
Figure 3. Effective Bits and Signal/(Noise + Distortion)
vs Input Frequency
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