6
LTC1285/LTC1288
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
INPUT FREQUENCY (Hz)
80
ATTENUATION
(%)
60
40
50
20
0
90
70
30
10
1k
100k
1M
10M
LTC1285/86 TPC15
100
10k
TA = 25°C
VCC = 2.7V
VREF = 2.5V
fSMPL = fSMPL(MAX)
Attenuation vs Input Frequency
Power Supply Feedthrough
vs Ripple Frequency
Intermodulation Distortion
Maximum Clock Frequency
vs Supply Voltage
FREQUENCY (kHz)
0
– 120
MAGNITUDE
(dB)
– 100
–80
–60
–40
1.0
2.0
3.0
4.0
LTC1285/88 TPC17
–20
0
0.5
1.5
2.5
3.5
TA = 25°C
VCC = 2.7V
VREF = 2.5V
f1 = 2.05kHz
f2 = 3.05kHz
fSMPL = 7.5kHz
RIPPLE FREQUENCY (Hz)
–80
FEEDTHROUGH
(dB)
–60
–40
–50
–20
0
–90
–70
–30
–10
1k
100k
1M
10M
LTC1285/86 TPC18
–100
10k
TA = 25°C
VCC = 2.7V (VRIPPLE = 1mV)
VREF = 2.5V
fCLK = 120kHZ
SUPPLY VOLTAGE (V)
2.5
100
CLOCK
FREQUENCY
(kHz)
120
160
180
200
300
240
3.5
4.5
5.0
LTC1285/88 TPC21
140
260
280
220
3.0
4.0
5.5
6.0
TA = 25°C
VREF = 2.5V
4096 Point FFT Plot
FREQUENCY (kHz)
0
– 120
MAGNITUDE
(dB)
– 100
–80
–60
–40
1.0
2.0
3.0
4.0
LTC1285/88 TPC16
–20
0
0.5
1.5
2.5
3.5
TA = 25°C
VCC = 2.7V
VREF = 2.5V
fIN = 3.05kHz
fCLK = 120kHz
fSMPL = 7.5kHz
Spurious-Free Dynamic Range
vs Input Frequency
INPUT FREQUENCY (kHz)
1
0
SPURIOUS-FREE
DYNAMIC
RANGE
(dB)
20
40
60
80
10
100
LTC1285/88 G13
100
10
30
50
70
90
TA = 25°C
VCC = 2.7V
VREF = 2.5V
fSMPL = fSMPL(MAX)
Maximum Clock Frequency
vs Source Resistance
SOURCE RESISTANCE (k
)
0.1
0
CLOCK
FREQUENCY
(kHz)
40
80
120
160
110
LTC1285/88 G19
200
20
60
100
140
180
TA = 25°C
VCC = 2.7V
VREF = 2.5V
–INPUT
+INPUT
VIN
RSOURCE
–
S/(N + D) vs Input Level
INPUT LEVEL (dB)
–45
SIGNAL-TO-NOISE
PLUS
DISTORTION
(dB)
40
50
60
–5
LTC1285/88 TPC14
30
20
0
–35
–25
–15
–40
0
–30
–20
–10
10
80
70
TA = 25°C
VCC = 2.7V
VREF = 2.5V
fIN = 1kHz
fSMPL = fSMPL(MAX)
Sample-and-Hold Acquisition
Time vs Source Resistance
SOURCE RESISTANCE (
)
1
100
S
&
H
ACQUISITION
TIME
(ns)
1000
10000
100
1000
10
10000
LTC1285/88 TPC20
TA = 25°C
VCC = 2.7V
VREF = 2.5V
–INPUT
+INPUT
VIN
RSOURCE
+