LT1251/LT1256
U
W
SIG AL A PLIFIER DC CHARACTERISTICS
0°C ≤ TA ≤ 70°C, VS = ±5V, VCM = 0V, VFS = 2.5V, IC = IFS = NULL = Open, Pins 5,10 = GND, unless otherwise noted.
SYMBOL PARAMETER
Large-Signal Voltage Gain
CONDITIONS
V = –3V to 3V, R = 150Ω
MIN
TYP
MAX
UNITS
A
VOL
83
83
0.75
0.75
±4.0
±3.0
±2.75
±14.0
1.2
93
dB
dB
MΩ
MΩ
V
V
V
V
V
O
L
V = –2.75V to 2.75V, R = 150Ω
●
O
L
–
R
OL
Transresistance, ∆V /∆I
V = –3V to 3V, R = 150Ω
1.8
OUT
IN
O
L
V = –2.75V to 2.75V, R = 150Ω
●
●
O
L
V
OUT
Maximum Output Voltage Swing
No Load
R = 150Ω
L
±4.2
±3.5
●
●
●
V = ±15V, No Load
±14.2
S
V = 5V, V = 2.5V, (Note 6)
3.8
S
CM
I
I
Maximum Output Current
Supply Current
V = ±5V
●
●
±30
±20
±40
±30
13.5
7.5
1.3
14.5
1.4
mA
mA
mA
mA
mA
mA
mA
O
S
V = 5V, V = V = 2.5V
S
CM
O
V = V = 2.5V
●
●
●
●
●
17.0
9.5
1.8
18.5
2.0
S
C
FS
V = V = 1.25V
C
FS
V = V = 0V
C
FS
V = V = 2.5V, V = ±15V
C
FS
S
V = V = 0V, V = ±15V
C
FS
S
U
U
W
CO TROL A D FULL SCALE A PLIFIER CHARACTERISTICS
0°C ≤ TA ≤ 70°C, VS = ±5V, VFS = 2.5V, IC = IFS = NULL = Open, Pins 5,10 = GND, unless otherwise noted.
SYMBOL PARAMETER
Control Amplifier Input Offset Voltage
CONDITIONS
Pin 4 to Pin 3
Pin 11 to Pin 12
MIN
TYP
5
5
100
100
–300
–300
5
MAX
15
15
UNITS
mV
mV
MΩ
MΩ
nA
●
●
●
●
●
●
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
25
25
–750
–750
3.75
4
nA
kΩ
kΩ
R
R
T = 25°C
6.25
6
C
A
Internal Full-Scale Resistor
T = 25°C
A
5
FS
Resistor Temperature Coefficient
Control Path Bandwidth
Control Path Rise and Fall Time
Control Path Transition Time
0.2
10
35
%/°C
MHz
ns
Small Signal, V = 100mV, (Note 7)
C
Small Signal, V = 100mV, (Note 7)
C
0% to 100%
150
ns
Control Path Propagation Delay
Small Signal, ∆V = 100mV
V from 0% or 100%
C
50
90
ns
ns
C
The
● denotes specifications which apply over the specified operating
Note 4: Differential gain and phase are measured using a Tektronix
TSG120YC/NTSC signal generator and a Tektronix 1780R Video
temperature range.
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 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 6: Tested with R = 150Ω to 2.5V to simulate an AC coupled load.
L
Note 3: T is calculated from the ambient temperature T and the power
Note 7: Small-signal control path response is measured driving R (Pin 5)
to eliminate peaking caused by stray capacitance on Pin 4.
J
A
C
dissipation P according to the following formulas:
D
LT1251CN/LT1256CN:
LT1251CS/LT1256CS:
T = T + (P • 70°C/W)
J A D
T = T + (P • 100°C/W)
J
A
D
4
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