MAX4027 Maxim, MAX4027 Datasheet - Page 7

• Manufacturer Part Number: MAX4027
• Description: The MAX4027 is a triple, wideband, 2-channel, noninverting gain-of-two video amplifier with input multiplexing, capable of driving up to two back-terminated video loads
• Manufacturer: Maxim

The MAX4027 combines three 2:1 multiplexers with
+2V/V (+6dB) closed-loop gain (A
low-power, high-speed device operates from ±5V sup-
plies, while driving up to two back-terminated video
loads with very low distortion. Differential gain and
phase errors are 0.012%/0.014° for the MAX4027.
The input multiplexers feature fast 15ns channel-
switching times and small switching transients. The
multiplexers also feature high input resistance and con-
stant input capacitance, so overall input impedance
can be set by external input-terminating resistors.
Drive EN high to place the amplifier outputs in a high-
impedance state, and minimize the supply current. This
function allows use of multiple mux/amps in parallel to
form large switching arrays.
The MAX4027 features an A/B input, which selects
either channel A or B. Drive A/B low to select channel A
or drive A/B high to select channel B. Channel A is
automatically selected if A/B is left unconnected.
PIN
10
11
12
13
14
1
2
3
4
5
6
7
8
9
NAME
OUT3
OUT2
OUT1
IN1A
IN2A
IN3A
GND
IN1B
IN2B
IN3B
V
V
A/B
EN
CC
EE
_______________________________________________________________________________________
Amplifier 1 Channel A Input
Amplifier 2 Channel A Input
Amplifier 3 Channel A Input
Power Supply, Analog and Digital Ground. Connect GND to ground plane for best RF performance.
Amplifier 1 Channel B Input
Amplifier 2 Channel B Input
Amplifier 3 Channel B Input
Output Enable Logic Input. Drive EN low or leave open for normal operation. Pull EN high to disconnect
amplifier output (output is high impedance when disabled). EN is internally pulled to GND through a 17kΩ
resistor.
Amplifier Output 3
Negative Power-Supply Voltage. Bypass V
Amplifier Output 2
Positive Power-Supply Voltage. Bypass V
Amplifier Output 1
Channel-Select Input. Drive A/B low or leave open to select channel A for all amplifiers. Pull A/B high to select
channel B for all amplifiers. A/B is internally pulled to GND through a 17kΩ resistor.
Detailed Description
VCL
225MHz, Triple, 2-Channel Video
) amplifiers. This
CC
EE
to GND with a 0.1µF capacitor.
to GND with a 0.1µF capacitor.
Drive EN high to place the MAX4027 in disable mode.
Placing the device in disable mode reduces the quies-
cent current to 17mA (V
the amplifier outputs into a high-impedance state, typi-
Table 1. Input Control Logic
Table 2. Output Control Logic
FUNCTION
Multiplexer-Amplifier
EN
A/B
0
1
0
1
AMPLIFIER OUTPUT
Applications Information
AMPLIFIER INPUT
IN_A
IN_B
On
Off
CC
) and 15mA (V
Pin Description
Truth Tables
Channel A Selected
Channel B Selected
Disable Mode
Outputs Enabled
Outputs High
FUNCTION
FUNCTION
Impedance
EE
) and places
7