5962-0721201QXC Datasheet, PDF (8/10 Pages) Intersil Corporation – Video Distribution Amplifier

5962-0721201QHC
Typical Performance Curves (Continued)
5.10
R_LOAD = 100Ω
5.05 ^VS ^{= ±6V}
5.00
4.95
4.90
4.85
4.80
4.75
-50 -25
0
25 50 75 100 125 150
TEMPERATURE (°C)
FIGURE 33. OUTPUT VOLTAGE vs TEMPERATURE
16.0
15.5
15.0
14.5
14.0
13.5
13.0
12.5
12.0
-50 -25
0
25 50 75 100 125 150
TEMPERATURE (°C)
FIGURE 34. SUPPLY CURRENT vs TEMPERATURE
3
A_V = 5
R_F = 750Ω
R_L = 100Ω DIFF
2
1
0
-1
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
V_S (±V)
FIGURE 35. DIFFERENTIAL PEAKING vs SUPPLY VOLTAGE
Applications Information
Product Description
The 5962-0721201QXC is a dual current feedback
operational amplifier designed for video distribution solutions.
It is a dual current mode feedback amplifier with low distortion
while drawing moderately low supply current. It is built using
Intersil’s proprietary complimentary bipolar process. Due to
the current feedback architecture, the 5962-0721201QXC
closed-loop 3dB bandwidth is dependent on the value of the
feedback resistor. First the desired bandwidth is selected by
choosing the feedback resistor, R_F, and then the gain is set by
picking the gain resistor, R_G. The curves at the beginning of
the Typical Performance Curves section show the effect of
varying both R_F and R_G. The 3dB bandwidth is somewhat
dependent on the power supply voltage.
Power Supply Bypassing and Printed Circuit
Board Layout
As with any high frequency device, good printed circuit
board layout is necessary for optimum performance. Ground
plane construction is highly recommended. Lead lengths
should be as short as possible, below ¼”. The power supply
pins must be well bypassed to reduce the risk of oscillation.
A 4.7µF tantalum capacitor in parallel with a 0.1µF ceramic
capacitor is adequate for each supply pin.
For good AC performance, parasitic capacitances should be
kept to a minimum, especially at the inverting input. This implies
keeping the ground plane away from this pin. Carbon resistors
are acceptable, while use of wire-wound resistors should not be
used because of their parasitic inductance. Similarly, capacitors
should be low inductance for best performance.
Capacitance at the Inverting Input
Due to the topology of the current feedback amplifier, stray
capacitance at the inverting input will affect the AC and
transient performance of the 5962-0721201QXC when
operating in the non-inverting configuration.
In the inverting gain mode, added capacitance at the inverting
input has little effect since this point is at a virtual ground and
stray capacitance is therefore not “seen” by the amplifier.
8
FN6558.1
November 1, 2007