LT1251/LT1256
U W
TYPICAL PERFORMANCE CHARACTERISTICS
LT1256
Gain vs Control Voltage
LT1251
Gain vs Control Voltage
Spot Input Noise Voltage and
Current vs Frequency
100
10
1
1.0
0.8
0.6
0.4
0.2
0
1.0
0.8
0.6
0.4
0.2
0
–i
n
IN2
IN2
V
= 2.5V
V
= 2.5V
FS
FS
IN1
1.0
IN1
e
n
+i
n
0
0.5
1.5
2.0
2.5
0
0.5
1.0
1.5
2.0
2.5
10
100
1k
10k
FREQUENCY (Hz)
CONTROL VOLTAGE (V)
CONTROL VOLTAGE (V)
1251/56 G06
1251/56 G02
1251/56 G01
LT1251/LT1256
Control Path Bandwidth
Undistorted Output Voltage
vs Frequency
LT1251/LT1256
Control Path Bandwidth
10
8
8
7
6
5
4
3
2
1
10
8
VOLTAGE DRIVE V
C
S
VOLTAGE DRIVE R
C
C
S
A
= 10
V
V
= ±5V
V
V
= GND
= ±5V
6
6
4
4
A
= 1
V
2
2
0
0
PIN 4 NOT IN SOCKET
–2
–4
–6
–8
–10
–2
–4
–6
–8
–10
V
= ±5V
= 1k
S
L
R
R = 1.5k
F
C
V
= V = 2.5V
FS
100k
1M
10M
100M
10k
100k
1M
10M
100M
10k
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
1251/56 G04
1251/56 G05
1251/56 G07
2nd and 3rd Harmonic Distortion
vs Frequency
THD Plus Noise vs Frequency
3rd Order Intercept vs Frequency
–20
–30
–40
–50
–60
–70
50
45
40
35
30
25
20
15
10
10
1
V
A
CC = ±5V
V
A
CC = ±15V
= 1
= 1.5k
= 100Ω
S
V
F
L
O
C
S
V
V
S
A
V
CC = ±5V, V = 1V
IN RMS
= 1
= 1, R = 1.5k, V = 2.5V
F
FS
R = 1.5k
R
R
F
L
C
R
V
V
= 1k
= 2V
V
C
CC = 10%
V
= V = 2.5V
FS
P-P
= V = 2.5V
FS
0.1
V
V
CC = 50%
C
C
3RD
0.01
2ND
CC = 100%
0.001
1
10
100
25
0
5
10
15
20
30
10
100
1k
10k
100k
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (Hz)
1251/56 G09
1251/56 G08
1251/56 G10
5
Linear [ Linear ]
