MAX3822 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – +3.3V, 2.5Gbps Quad Limiting Amplifier

19-2144; Rev 1; 7/04
+3.3V, 2.5Gbps Quad Limiting Amplifier
General Description
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.
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.
Applications
Optical System Interconnects
Multichannel Receiver Modules
Dense Digital Cross-Connects
ATM Switch Networks
High-Speed Parallel Links
Features
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
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 PIN-PACKAGE
MAX3822UCM
MAX3822UCM+
0°C to +85°C
0°C to +85°C
48 TQFP-EP*
48 TQFP-EP*
MAX3822U/D
0°C to +85°C
Dice**
*Exposed pad.
**Contact factory for availability. Dice are designed to operate
from T_A = 0°C to T_A = +85°C, but are tested and guaranteed
only at T_A = +25°C.
+Denotes lead-free package.
Pin Configuration
TOP VIEW
Typical Operating Circuit appears at end of data sheet.
IN1+ 1
IN1- 2
V_CC 3
IN2+ 4
IN2- 5
V_CC 6
V_CC 7
IN3+ 8
IN3- 9
V_CC 10
IN4+ 11
IN4- 12
MAX3822
36 OUT1+
35 OUT1-
34 V_CC
33 OUT2+
32 OUT2-
31 V_CC
30 V_CC
29 OUT3+
28 OUT3-
27 VCC
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.