LT1204 Datasheet, PDF (1/20 Pages) Linear Technology – 4-Input Video Multiplexer with 75MHz Current Feedback Amplifier

FEATURES
s _{0.1dB Gain Flatness > 30MHz}
s _{Channel Separation at 10MHz: 90dB}
s _{40mV Switching Transient, Input Referred}
s _{– 3dB Bandwidth, AV = 2, RL = 150Ω: 75MHz}
s _{Channel-to-Channel Switching Time: 120ns}
s _{Easy to Expand for More Inputs}
s _{Large Input Range: ± 6V}
s _{0.04% Differential Gain, RL = 150Ω}
s _{0.06° Differential Phase, RL = 150Ω}
s _{High Slew Rate: 1000V/µs}
s _{Output Swing, RL = 400Ω: ±13V}
s _{Wide Supply Range: ±5V to ±15V}
APPLICATI S
s _{Broadcast Quality Video Multiplexing}
s _{Large Matrix Routing}
s _{Medical Imaging}
s _{Large Amplitude Signal Multiplexing}
s _{Programmable Gain Amplifiers}
LT1204
4-Input Video Multiplexer
with 75MHz Current
Feedback Amplifier
DESCRIPTIO
The LT^®1204 is a 4-input video multiplexer designed to
drive 75Ω cables and easily expand into larger routing
systems. Wide bandwidth, high slew rate, and low differ-
ential gain and phase make the LT1204 ideal for broadcast
quality signal routing. Channel separation and disable
isolation are greater than 90dB up to 10MHz. The channel-
to-channel output switching transient is only 40mV_P-P,
with a 50ns duration, making the transition imperceptible
on high quality monitors.
A unique feature of the LT1204 is its ability to expand into
larger routing matrices. This is accomplished by a patent
pending circuit that bootstraps the feedback resistors in
the disable condition, raising the true output impedance of
the circuit. The effect of this feature is to eliminate cable
misterminations in large systems.
The large input and output signal levels supported by the
LT1204 when operated on ±15V supplies make it ideal for
general purpose analog signal selection and multiplexing.
A shutdown feature reduces the supply current to 1.5mA.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATI
V_IN0
1 ^VIN0 ₊₁
75Ω
2
GND
V_IN1
3 ^VIN1 ₊₁
75Ω
4
GND
V_IN2
5
V_IN2
+1
75Ω
6
GND
V_IN3
7 ^VIN3 ₊₁
75Ω
8
REF
–15V
6.8k 8.2k
+
CFA
–
V^{+ 16} 15V
V_{O 15}
V^{– 14} –15V
FB 13
75Ω
V_OUT
R_F
1k _RG
1k
LOGIC
S/D 12
ENABLE 11
A1 10
A0 9
LT1204
1204 TA01
All Hostile Crosstalk
Surface Mount PCB Measurements
– 20
V_S = ±15V
V_{IN 0} = GND
–40 ^VIN 1,2,3 ^{= 0dBm}
R_L = 100Ω
– 60
– 80
– 100
– 120
1
10
FREQUENCY (MHz)
100
1204 TA02
1