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PDF RC6303 Data sheet ( Hoja de datos )

Número de pieza RC6303
Descripción Triple Video Amplifier
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo



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RC6303
Triple Video Amplifier
with Separate Enable Inputs
Features
• Triple video amplifier
• Independently enabled amplifiers
• 90 MHz -3 dB Bandwidth (AV = 2)
• 20 MHz ±0.1 dB gain flatness
• Stable at AV ³ 2
• 0.06% differential gain (AV = 2, RL = 150W)
• 0.06° differential phase (AV = 2, RL = 150W)
• High CMRR (100dB), High PSRR (80 dB)
• Dual ±5V power supply
• Low offset 1.0 mV
• 16-pin narrow SO package
• 300 V/ms slew rate
• Fast settling time: 0.1% in 35 ns
• TTL or CMOS compatible enable inputs
www.fairchildsemi.com
Applications
• RGB amplifier
• 3:1 crosspoint switch
• RGB switch
• Video instrumentation amplifier
• Selectable gain amplifier
• Active filter
Description
The RC6303 consists of three low power, wide band voltage
feedback operational amplifiers. Each channel is capable of
delivering a load current of at least 35mA. Each amplifier
can be independently enabled or disabled with a TTL or
CMOS signal. When disabled, the amplifier is in a high
impedance output state, presenting a very high input to out-
put isolation.
The amplifiers are optimized for video applications with gain
³ 2 where low differential gain and low phase distortion are
significant requirements.
The layout is optimized for minimal crosstalk between
amplifiers.
Block Diagram
RC6303
IN1–
IN1+
+
IN2–
IN2+
+
IN3–
IN3+
+
VCC
VCCO
VEE
VEEO
OUT1
EN1
OUT2
EN2
65-3399-01
OUT3
EN3
Rev. 1.0.0

1 page




RC6303 pdf
PRODUCT SPECIFICATION
RC6303
Applications Discussion
Each of the three sections of the RC6303 is provided with an
Enable input, thus the part is useful for selecting and multi-
plexing. A three-channel video multiplexer can be built with
just one RC6303 and a decoder, as shown in Figure 1.
Note that RC6303 enable time is shorter than its disable
time, hence a make-before-break action is provided, mini-
mizing switching transients on the signal output.
An RGB switch is shown in Figure 2.
Capacitive Load
The RC6303 can drive a capacitive load from 10 to over 100
pF. In back terminated video applications, bandwidth will
only be limited by the RC time constants of the external out-
put components. A minimum 10 pF capacitive load is
required. When driving a 75W cable, place the 75W source
termination resistor as close to the amplifier output as possi-
ble.
Enable/Disable
The enable pins (10, 12, 14), when pulled to a TTL or
CMOS logic low or when tied to ground, activate each
amplifier individually. When pulled to a TTL or CMOS logic
high, the amplifier is tri-stated and presents a high imped-
ance at its output. When disabled the amplifier's power con-
sumption drops, and the non-inverting input signal is isolated
from its respective output.
DC Accuracy
Since the RC6303 is a voltage-feedback amplifier, the invert-
ing and non-inverting inputs have similar impedances and
bias currents. To minimize offset voltage, match the source
resistances seen by inverting and non-inverting inputs.
Feedback Components
Because the RC6303 is a voltage-feedback amplifier, it facil-
itates using reactive (capacitive and inductive) feedback
components for implementing filters, integrators, sample/
hold circuits, etc. The feedback network and the parasitic
capacitance at the inverting (summing junction) input create
a pole and affect the transfer function of the circuit. For sta-
ble operation, minimize the parasitic capacitance and equiva-
lent resistance of the components used in the feedback
circuit.
Circuit Board
High-frequency applications require good grounding, power
supply decoupling, low parasitic capacitance and inductance,
and good isolation between the inputs to minimize their
crosstalk. Avoid coupling from output to input to prevent
positive feedback.
Channel 1
Input
R
+
Channel 2
Input
G
+
Channel 3
Input
B
+
Decoder
Figure 1.
Output
65-7460
Video Busses
RGB
Channel a
Red Input
R
+
Channel b
R
+
Red Input
Channel a
Green Input
G
+
G
+
Channel b
Green Input
Channel a
Blue Input
Channel
Select
B
+
74LS04
Figure 2.
– Channel b
B Blue Input
+
65-7461
5

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