LM7121IN National Semiconductor, LM7121IN Datasheet - Page 15

• Manufacturer Part Number: LM7121IN
• Description: IC AMP FEEDBACK 235MHZ 8DIP
• Manufacturer: National Semiconductor

Specifications of LM7121IN

• Amplifier Type: Voltage Feedback
• Number Of Circuits: 1
• Slew Rate: 1300 V/µs
• Gain Bandwidth Product: 175MHz
• -3db Bandwidth: 235MHz
• Current - Input Bias: 5.2µA
• Voltage - Input Offset: 900µV
• Current - Supply: 5.3mA
• Current - Output / Channel: 71mA
• Voltage - Supply, Single/dual (±): 4.5 V ~ 33 V, ±2.25 V ~ 16.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Output Type: -
• Other names: *LM7121IN

Application Information
Differential Gain and Differential Phase errors measured at
the load are less than 1% and 1 respectively
R
compensate for the line losses and for proper response at
the output Values shown correspond to a twisted pair cable
length of 25 meters with about 3 turns inch (see Figure 5 for
step response)
The supply voltage can vary from 8 5V up to 30V with the
output rise and fall times under 12 ns With the component
values shown the overall gain from the input to the output is
about 1
Even though the transmission line is not terminated in its
nominal characteristic impedance of about 600
ing reflection at the load is only about 5% of the total signal
and in most cases can be neglected Using 75
instead has the advantage of operating at a low impedance
and results in a higher realizable bandwidth and signal
fidelity
G
and C
C
can be adjusted for various cable lengths to
(c) A
V
e a
(a) A
2 Capacitive Load
V
e b
1
(e) A
(Continued)
V
e a
FIGURE 6 Application Test Circuits
TL H 12348 – A0
TL H 12348 – 98
termination
1 V
the result-
S
e a
5V Single Supply Operation
15
C
C
R
R
C
C
F
F
e
e
e
e
FIGURE 5 Step Response to a 1 V
0
510
2 pF for R
Open for R
C
C
C
e
C
Measured across the 75
L
e
Open for V
L
e
e
3 pF for V
100
Open
S k
(b) A
(d) A
TL H 12348 – A2
S t
6V
6V
V
V
e a
e a
2
1
PP
Load
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Input Signal
TL H 12348– A1
TL H 12348– 95
TL H 12348– 99
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