Datasheet

4
LT1248
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
Reference Voltage vs
Temperature
JUNCTION TEMPERATURE (°C)
–75
REFERENCE VOLTAGE (V)
75
7.536
7.524
7.512
7.500
7.488
7.476
7.464
7.452
7.440
7.428
1248 G03
–50 150
–25
0 25 50 100
125
I
AC
(µA)
0
I
M
(µA)
300
150
0
1248 G04
250
500
VA
OUT
= 7V
VA
OUT
= 6.5V
VA
OUT
= 6V
VA
OUT
= 5.5V
VA
OUT
= 5V
VA
OUT
= 4.5V
VA
OUT
= 4V
VA
OUT
= 3.5V
VA
OUT
= 3V
VA
OUT
= 2.5V
SUPPLY VOLTAGE (V)
10
SUPPLY CURRENT (mA)
11
10
9
8
7
6
5
4
3
2
1
0
1248 G05
21
32
T
J
= 25°CT
J
= 125°C
T
J
= –55°C
Supply Current vs Supply Voltage GTDR Source Current
SINK CURRENT (mA)
0
GTDR VOLTAGE (V)
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1248 G07
300
T
A
= 125°C
T
A
= –55°C
60
120 180 240
T
A
= 25°C
FREQUENCY (Hz)
10
GAIN (dB)
100
80
60
40
20
0
–20
100
1k 10k 100k
1148 G01
1M 10M
0
–20
–40
–60
–80
–100
–120
PHASE (DEG)
PHASE
GAIN
Voltage Amplifier Open-Loop
Gain and Phase
FREQUENCY (Hz)
10
GAIN (dB)
100
80
60
40
20
0
–20
100
1k 10k 100k
1148 G02
1M 10M
0
–20
–40
–60
–80
–100
–120
PHASE (DEG)
PHASE
GAIN
Current Amplifier Open-Loop
Gain and Phase
Multiplier Current
SOURCE CURRENT (mA)
0
GTDR VOLTAGE (V)
18.5
18.0
17.5
17.0
16.5
16.0
15.5
15.0
14.5
14.0
13.5
13.0
1248 G06
–300
T
J
= 25°C
T
J
= 125°C
V
CC
= 18V
T
J
= –55°C
–60
–120 –180 –240
GTDR Sink Current