LT1251/LT1256
SIG AL A PLIFIER DC CHARACTERISTICS
SYMBOL
A
VOL
R
OL
V
OUT
PARAMETER
Large-Signal Voltage Gain
Transresistance,
∆V
OUT
/∆I
IN–
Maximum Output Voltage Swing
0°C
≤
T
A
≤
70°C, V
S
=
±5V,
V
CM
= 0V, V
FS
= 2.5V, I
C
= I
FS
= NULL = Open, Pins 5,10 = GND, unless otherwise noted.
CONDITIONS
V
O
= – 3V to 3V, R
L
= 150Ω
V
O
= – 2.75V to 2.75V, R
L
= 150Ω
V
O
= – 3V to 3V, R
L
= 150Ω
V
O
= – 2.75V to 2.75V, R
L
= 150Ω
No Load
R
L
= 150Ω
V
S
=
±15V,
No Load
V
S
= 5V, V
CM
= 2.5V, (Note 6)
V
S
=
±5V
V
S
= 5V, V
CM
= V
O
= 2.5V
V
C
= V
FS
= 2.5V
V
C
= V
FS
= 1.25V
V
C
= V
FS
= 0V
V
C
= V
FS
= 2.5V, V
S
=
±15V
V
C
= V
FS
= 0V, V
S
=
±15V
MIN
83
83
0.75
0.75
±4.0
±3.0
±2.75
±14.0
1.2
±30
±20
TYP
93
1.8
±4.2
±3.5
±14.2
3.8
±40
±30
13.5
7.5
1.3
14.5
1.4
MAX
UNITS
dB
dB
MΩ
MΩ
V
V
V
V
V
mA
mA
mA
mA
mA
mA
mA
I
O
I
S
Maximum Output Current
Supply Current
CO TROL A D FULL SCALE A PLIFIER CHARACTERISTICS
0°C
≤
T
A
≤
70°C, V
S
=
±5V,
V
FS
= 2.5V, I
C
= I
FS
= NULL = Open, Pins 5,10 = GND, unless otherwise noted.
SYMBOL
PARAMETER
Control Amplifier Input Offset Voltage
Full-Scale Amplifier Input Offset Voltage
Control Amplifier Input Resistance
Full-Scale Amplifier Input Resistance
Control Amplifier Input Bias Current
Full-Scale Amplifier Input Bias Current
Internal Control Resistor
Internal Full-Scale Resistor
Resistor Temperature Coefficient
Control Path Bandwidth
Control Path Rise and Fall Time
Control Path Transition Time
Control Path Propagation Delay
CONDITIONS
Pin 4 to Pin 3
Pin 11 to Pin 12
MIN
q
q
q
q
q
q
R
C
R
FS
The
q
denotes specifications which apply over the specified operating
temperature range.
Note 1:
A heat sink may be required depending on the power supply
voltage.
Note 2:
Commercial grade parts are designed to operate over the
temperature range of – 40°C to 85°C but are neither tested nor guaranteed
beyond 0°C to 70°C. Industrial grade parts specified and tested over
– 40°C to 85°C are available on special request. Consult factory.
Note 3:
T
J
is calculated from the ambient temperature T
A
and the power
dissipation P
D
according to the following formulas:
LT1251CN/LT1256CN:
T
J
= T
A
+ (P
D
• 70°C/W)
LT1251CS/LT1256CS:
T
J
= T
A
+ (P
D
• 100°C/W)
4
W
U
W
U
q
q
q
q
q
q
q
q
q
q
q
q
q
17.0
9.5
1.8
18.5
2.0
U
T
A
= 25°C
T
A
= 25°C
Small Signal, V
C
= 100mV, (Note 7)
Small Signal, V
C
= 100mV, (Note 7)
0% to 100%
Small Signal,
∆V
C
= 100mV
V
C
from 0% or 100%
25
25
– 750
– 750
3.75
4
TYP
5
5
100
100
– 300
– 300
5
5
0.2
10
35
150
50
90
MAX
15
15
6.25
6
UNITS
mV
mV
MΩ
MΩ
nA
nA
kΩ
kΩ
%/°C
MHz
ns
ns
ns
ns
Note 4:
Differential gain and phase are measured using a Tektronix
TSG120YC/NTSC signal generator and a Tektronix 1780R Video
Measurement Set. The resolution of this equipment is 0.1% and 0.1°. Five
identical amplifier stages were cascaded giving an effective resolution of
0.02% and 0.02°.
Note 5:
Differential gain and phase are best when the control is set at 0%
or 100%. See the Typical Performance Characteristics curves.
Note 6:
Tested with R
L
= 150Ω to 2.5V to simulate an AC coupled load.
Note 7:
Small-signal control path response is measured driving R
C
(Pin 5)
to eliminate peaking caused by stray capacitance on Pin 4.
LINER [ LINEAR TECHNOLOGY ]
