LTC1277 Просмотр технического описания (PDF) - Linear Technology
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LTC1277 Datasheet PDF : 20 Pages
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LTC1274/LTC1277
TYPICAL PERFORMANCE CHARACTERISTICS
S/(N + D) vs Input Frequency
and Amplitude
80
70
VIN = 0dB
60
VIN = – 20dB
50
40
30
20
VIN = – 60dB
10
fSAMPLE = 100kHz
0
10k
100k
1M 2M
INPUT FREQUENCY (Hz)
LTC1274/77 • TPC04
Signal-to-Noise Ratio (Without
Harmonics) vs Input Frequency
80
70
60
50
Distortion vs Input Frequency
0
fSAMPLE = 100kHz
–20
–40
40
–60
30
20
10
fSAMPLE = 100kHz
0
10k
100k
1M 2M
INPUT FREQUENCY (Hz)
LTC1274/77 • TPC05
–80
THD
–100
–120
10k
2ND HARMONIC
3RD HARMONIC
100k
1M 2M
INPUT FREQUENCY (Hz)
LTC1274/77 • TPC06
Spurious-Free Dynamic Range vs
Input Frequency
0
–10 fSAMPLE = 100kHz
–20
–30
–40
–50
–60
–70
–80
–90
–100
10k
100k
1M 2M
INPUT FREQUENCY (Hz)
LTC1274/77 • TPC07
Intermodulation Distortion Plot
0
–20
–40
–60
–80
–100
fb – fa
2fa – fb
2fa
2fb – fa
fb – fa
2fb
3fa 2fa – fb
fa + 2fb
3fb
–120
0
10
20
30
FREQUENCY (kHz)
fSAMPLE = 100kHz
fa = 9.54kHz
fb = 9.79kHz
40
50
LTC1274/77 • TPC08
Intermodulation Distortion Plot
0
fa
fb
–20
fb – fa
2fb – fa
2fa – fb
–40
2fb fa + fb
2fa
–60
3fb
2fb + fa
–80
2fa + fb
3fa
–100
fSAMPLE = 100kHz
fa = 96.948kHz
fb = 97.681kHz
Acquistion Time vs
Source Impedance
3.5
TA = 25°C
3.0
2.5
2.0
1.5
1.0
0.5
–120
0
0
10k
20k
30k
40k
50k
10
100
1k
10k
FREQUENCY (Hz)
SOURCE RESISTANCE (Ω)
LTC1274/77 • TPC09
LTC1274/75 • TPC10
6
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