Datasheet

6
LTC1594L/LTC1598L
15948lfb
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Power Supply Feedthrough
vs Ripple Frequency
FREQUENCY (kHz)
0
–120
MAGNITUDE (dB)
–100
–80
–60
–40
1.0 2.0
3.0
4.0
1594L/98L G13
–20
0
0.5 1.5
2.5
3.5
T
A
= 25°C
V
CC
= 2.7V
V
REF
= 2.5V
f
IN
= 3.05kHz
f
CLK
= 120kHz
f
SMPL
= 7.5kHz
4096 Point FFT Plot
RIPPLE FREQUENCY (Hz)
–80
FEEDTHROUGH (dB)
–60
–40
–50
–20
0
–90
–70
–30
–10
1k 100k 1M 10M
1594L/98L G15
–100
10k
T
A
= 25°C
V
CC
= 2.7V (V
RIPPLE
= 1mV)
V
REF
= 2.5V
f
CLK
= 200kHz
Intermodulation Distortion
FREQUENCY (kHz)
0
–120
MAGNITUDE (dB)
–100
–80
–60
–40
1.0 2.0
3.0
4.0
1594L/98L G14
–20
0
0.5 1.5
2.5
3.5
T
A
= 25°C
V
CC
= 2.7V
V
REF
= 2.5V
f1 = 2.05kHz
f2 = 3.05kHz
f
SMPL
= 7.5kHz
Maximum Clock Frequency
vs Source Resistance
SOURCE RESISTANCE (Ω)
10
CLOCK FREQUENCY (kHz)
120
130
150
170
100 1000
1594L/98L G16
200
140
160
180
190
–INPUT
+INPUTV
IN
R
SOURCE
–
T
A
= 25°C
V
CC
= 2.7V
V
REF
= 2.5V
Sample-and-Hold Acquisition Time
vs Source Resistance
SOURCE RESISTANCE (Ω)
1
100
S & H ACQUISITION TIME (ns)
1000
10000
100 100010 10000
1594L/98L G17
T
A
= 25°C
V
CC
= 2.7V
V
REF
= 2.5V
–INPUT
+INPUTV
IN
R
SOURCE
+
Input Channel Leakage Current
vs Temperature
Minimum Clock Frequency for
0.1LSB Error vs Temperature
TEMPERATURE (°C)
0
CLOCK FREQUENCY (kHz)
80
100
120
40
1594L/98L G18
60
40
0
10
20 30
60 70
50
20
2
V
CC
= 2.7V
V
REF
= 2.5V
TEMPERATURE (°C)
–55
LEAKAGE CURRENT (nA)
10
100
1000
105
1594L/98L G19
1
0.1
0.01
–15
25
65
–35 125
5
45
85
V
CC
= 2.7V
V
REF
= 2.5V
ON CHANNEL
OFF CHANNEL