LTC1274 Linear Technology, LTC1274 Datasheet - Page 6

• Manufacturer Part Number: LTC1274
• Description: 12-Bit/ 10mW/ 100ksps ADCs with 1uA Shutdown
• Manufacturer: Linear Technology

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