19-2144; Rev 1; 7/04
+3.3V, 2.5Gbps Quad Limiting Amplifier
General Description
Features
The MAX3822 quad limiting amplifier is ideal for multi-
channel systems with data rates up to 2.5Gbps. The
MAX3822 operates from a single +3.3V supply, over
temperatures ranging from 0°C to +85°C. A channel-
select (CS) pin is provided to program single-, dual-, or
quad-channel operation. The disabled channels are
shut down to reduce power consumption. The output
interface for all four channels is CML.
o Single +3.3V Supply
o Single-, Dual-, or Quad-Channel Operation at
2.5Gbps
o 700mW Total Power Dissipation (Quad-Channel
Operation)
o 120ps Maximum Output Edge Speed
o Overall and Individual Channel Loss-of-Power
(LOP) Indicator
The input can be driven from 20mVp-p to 1000mVp-p
differentially. The threshold voltage control is common
for all four channels and is programmable by an exter-
nal resistor. Four separate power detectors are incorpo-
rated to monitor the received signal level for each
channel. Individual TTL-compatible loss-of-power (LOP)
indicators assert low if the channel signal input is below
the programmed threshold. Typically 4dB LOP hystere-
sis (2dB optical) is provided to prevent chattering when
the input signal level is close to the threshold. A general
LOP indicator is also provided which asserts low if one
or more of the four inputs is in the LOP condition.
o Differential CML Outputs with On-Chip Back
Termination Resistors
o 30ps Maximum Deterministic Jitter
o 2ps Random Jitter
o Power-Down Feature Shuts Down Unused
Channels
o Operating Temperature Range: 0°C to +85°C
Ordering Information
PART
TEMP RANGE
0°C to +85°C
0°C to +85°C
0°C to +85°C
PIN-PACKAGE
48 TQFP-EP*
48 TQFP-EP*
Dice**
Applications
MAX3822UCM
MAX3822UCM+
MAX3822U/D
Optical System Interconnects
Multichannel Receiver Modules
Dense Digital Cross-Connects
ATM Switch Networks
*Exposed pad.
**Contact factory for availability. Dice are designed to operate
from T = 0°C to T = +85°C, but are tested and guaranteed
A
A
High-Speed Parallel Links
only at T = +25°C.
A
+Denotes lead-free package.
Pin Configuration
TOP VIEW
Typical Operating Circuit appears at end of data sheet.
IN1+
IN1-
1
2
36 OUT1+
35 OUT1-
V
CC
3
34
V
CC
IN2+
IN2-
4
33 OUT2+
32 OUT2-
5
V
V
6
31
30
V
V
CC
CC
CC
CC
MAX3822
7
IN3+
IN3-
8
29 OUT3+
28 OUT3-
9
V
10
27
V
CC
CC
IN4+ 11
IN4- 12
26 OUT4+
25 OUT4-
TQFP-EP
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.