Datasheet

6
LTC1278
INPUT FREQUENCY (Hz)
10k
–100
AMPLITUDE (dB BELOW THE FUNDAMENTAL)
–80
–60
–40
–20
100k 2M1M
LT1278 G6
–90
–70
–50
–30
–10
0
f
SAMPLE
= 500kHz
3RD HARMONIC
THD
2ND HARMONIC
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Spurious Free Dynamic Range vs
Input Frequency
INPUT FREQUENCY (Hz)
20
SIGNAL/(NOISE + DISTORTION) (dB)
40
50
70
80
1k 100k 1M 10M
LTC1278 G10
0
10k
60
30
10
V
IN
= 0dB
V
IN
= –20dB
V
IN
= –60dB
f
SAMPLE
= 500kHz
S/(N + D) vs Input Frequency
and Amplitude Distortion vs Input Frequency
INPUT FREQUENCY (Hz)
20
SIGNAL TO NOISE RATIO (dB)
40
50
70
80
1k 100k 1M 10M
LTC1278 G5
0
10k
60
30
10
f
SAMPLE
= 500kHz
Signal-to-Noise Ratio (without
Harmonics) vs Input Frequency
INPUT FREQUENCY (Hz)
10k
–100
SPURIOUS FREE DYNAMIC RANGE (dB)
–80
–60
–40
–20
100k 1M 2M
LTLTC1278 G11
–90
–70
–50
–30
–10
0
f
SAMPLE
= 500kHz
FREQUENCY (Hz)
0
–120
AMPLITUDE (dB)
–100
–80
–60
–40
–20
0
50k 100k 150k 200k
LTC1278 G8
250k
f
SAMPLE
= 500kHz
f
IN1
= 96.80kHz
f
IN2
= 101.68kHz
Intermodulation Distortion Plot
R
SOURCE
(Ω)
10
2500
ACQUISITION TIME (ns)
3000
3500
4000
4500
100 1k 10k
LTC1278 G9
2000
1500
500
0
1000
Acquisition Time vs
Source Impedance
LOAD CURRENT (mA)
–5
2.405
REFERENCE VOLTAGE (V)
2.410
2.415
2.420
2.425
2.430
2.435
–4 –2 –1 2
LTC1278 G12
–3 0 1

Reference Voltage vs Load Current
RIPPLE FREQUENCY (Hz)
1k
–120
AMPLITUDE OF POWER SUPPLY FEEDTHROUGH (dB)
–40
–20
0
10k 100k 1M
LTC1278 G7
–60
–80
–100
f
SAMPLE
= 500kHz
AV
DD
(V
RIPPLE
= 1mV)
DGND (V
RIPPLE
= 0.1V)
V
SS
(V
RIPPLE
= 10mV)
Power Supply Feedthrough
vs Ripple Frequency
TEMPERATURE (C°)
–55
0
SUPPLY CURRENT (mA)
5
10
15
20
–25 0 25 50
LTC1278 G3
75 100 125
f
SAMPLE
= 500kHz
Supply Current vs Temperature