Datasheet

6
LTC1274/LTC1277
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Signal-to-Noise Ratio (Without
Harmonics) vs Input Frequency
INPUT FREQUENCY (Hz)
10k
SIGNAL/(NOISE + DISTORTION)(dB)
100k 2M1M
LTC1274/77 • TPC04
80
70
60
50
40
30
20
10
0
V
IN
= –60dB
V
IN
= –20dB
V
IN
= 0dB
f
SAMPLE
= 100kHz
INPUT FREQUENCY (Hz)
10k
SIGNAL-TO-NOISE RATIO (dB)
100k 2M1M
LTC1274/77 • TPC05
80
70
60
50
40
30
20
10
0
f
SAMPLE
= 100kHz
Distortion vs Input Frequency
THD
INPUT FREQUENCY (Hz)
10k
DISTORTION (dB)
0
–20
–40
–60
–80
–100
–120
100k 1M 2M
LTC1274/77 • TPC06
3RD HARMONIC
2ND HARMONIC
f
SAMPLE
= 100kHz
INPUT FREQUENCY (Hz)
10k
SPURIOUS-FREE DYNAMIC RANGE (dB)
100k 2M1M
LTC1274/77 • TPC07
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
f
SAMPLE
= 100kHz
Spurious-Free Dynamic Range vs
Input Frequency Intermodulation Distortion Plot
S/(N + D) vs Input Frequency
and Amplitude
FREQUENCY (kHz)
0
AMPLITUDE (dB)
0
–20
–40
–60
–80
–100
–120
10 20 30 40
LTC1274/77 • TPC08
50
fb – fa
2fb – fa
2fa – fb
2fa
2fb
3fb
fa + 2fb
3fa
2fa – fb
f
SAMPLE
= 100kHz
fa = 9.54kHz
fb = 9.79kHz
fb – fa
SOURCE RESISTANCE (Ω)
10
ACQUISITION TIME (µs)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
100 1k 10k
LTC1274/75 • TPC10
T
A
= 25°C
Acquistion Time vs
Source Impedance
Intermodulation Distortion Plot
FREQUENCY (Hz)
0
AMPLITUDE (dB)
0
–20
–40
–60
–80
–100
–120
10k 20k 30k 40k
LTC1274/77 • TPC09
50k
2fb – fa
fb
fa
fb – fa
2fb
2fa – fb
2fa
3fb
2fb + fa
2fa + fb
fa + fb
3fa
f
SAMPLE
= 100kHz
fa = 96.948kHz
fb = 97.681kHz