MAX3822EVKIT Maxim Integrated, MAX3822EVKIT Datasheet - Page 2

• Manufacturer Part Number: MAX3822EVKIT
• Description: Amplifier IC Development Tools
• Manufacturer: Maxim Integrated
• Series: MAX3822r

The MAX3822 EV kit contains all components neces-
sary to evaluate the MAX3822 quad-limiting amplifier.
The completely assembled and factory-tested EV kit
features on-board power-supply filtering and operates
from a single +3.3V supply. In quad-channel operation,
the MAX3822 EV kit consumes approximately 240mA
(current consumption drops to approximately 70mA for
single-channel operation). The MAX3822 EV kit is
shipped from the factory configured for interfacing with
standard 50Ω test equipment.
Side-mount SMA connectors are used for the
MAX3822’s signal I/O ports. To simplify interfacing to
50Ω test equipment, the EV kit provides AC-coupling
for the MAX3822’s CML inputs and outputs. All differen-
tial input and output data paths are 50Ω controlled-
impedance transmission lines.
The MAX3822 EV kit facilitates programming of the
input signal level threshold with two potentiometers.
Use R7 for coarse tuning and R8 for fine tuning. Test
points and LEDs are provided for monitoring the
MAX3822’s LOP output. The LOP outputs are connect-
ed to the two pins on the OUT side of J18–J22.
Program the MAX3822’s operational mode with J9.
Single-, dual-, and quad-channel operation is accom-
MAX3822 Evaluation Kit
2
Table 1. Jumpers, Test Points, and Indicators
_______________________________________________________________________________________
NAME
J18
J19
J20
J9
3-pin header
3-pin header
3-pin header
3-pin header
TYPE
Detailed Description
Channel-Select Input. Leave all pins open to enable channel 1. Short pins 1 and 2 to
activate channels 1 and 2. Short pins 2 and 3 to enable all four channels.
Connects LOP LED Indicator to the LOP Output of Channel 1. Shunting pins on the LED
side causes the LOP output to be connected to the LED and removing the shunt opens the
LOP LED.
Connects LOP LED Indicator to the LOP Output of Channel 2. Shunting pins on the LED
side causes the LOP output to be connected to the LED and removing the shunt opens the
LOP LED.
Connects LOP LED Indicator to the LOP Output of Channel 3. Shunting pins on the LED
side causes the LOP output to be connected to the LED and removing the shunt opens the
LOP LED.
plished by shunting (or removing the shunt from) the
appropriate pins of J9. For single-channel operation,
remove the shunt from J9 to enable channel 1. For
dual-channel operation, shunt pins 1 and 2 on J9 to
enable channels 1 and 2. For quad-channel operation,
shunt pins 2 and 3 on J9 to enable all four channels.
When in single- or dual-channel operation, the unused
amplifiers are shut down and overall current consump-
tion is reduced. If desired, current consumption can be
further reduced by disabling the LOP diodes’ drive cur-
rent. Current is delivered to the LEDs through J18–J22.
For example, to conserve current while in dual-channel
operation, disable LEDs for channels 1 and 2 by remov-
ing the shunts from J18 and J19.
The MAX3822 quad limiting amplifier is a high-gain,
high-frequency device whose performance can be
affected by poor board layout. The MAX3822 EV kit is
fabricated on a four-layer board with controlled imped-
ance transmission lines and separate power and
ground planes. Supply noise filtering is done with
inductive filtering and decoupling capacitors placed
close to the IC’s VCC pins.
FUNCTION
Connections, Adjustments,
Layout Considerations
and Controls