MAX3969 Datasheet, PDF (1/11 Pages) Maxim Integrated Products – 200Mbps SFP Limiting Amplifier

19-3251; Rev 0; 4/04
200Mbps SFP Limiting Amplifier
General Description
The MAX3969 limiting amplifier with PECL data outputs is
ideal for low-cost ATM, Fast Ethernet, FDDI and ESCON
fiber optic receivers.
The MAX3969 features 1mV_P-P input sensitivity and an
integrated power detector that senses the input signal
power. It provides a received-signal-strength indicator
(RSSI), which is an analog indication of the power level.
Signal strength is also indicated by the complementary
TTL loss-of-signal (LOS) outputs and the PECL signal-
detect (SD) output, both of which indicate the power
level relative to a programmable threshold.
The threshold can be adjusted to detect signal ampli-
tudes as low as 2.7mV_P-P. An optional squelch function
disables switching of the data outputs by holding them
at a known state when the signal is below the pro-
grammed threshold.
The MAX3969 is available in die form and a 4mm x
4mm, 20-pin thin QFN package.
Applications
SFP/SFF Transceivers
Fast Ethernet/FDDI Transceivers
155Mbps LAN ATM Transceivers
ESCON Receivers
FTTx Transceivers
Features
♦ 1mV_P-P Input Sensitivity
♦ Loss-of-Signal Detector with Programmable
Threshold
♦ TTL LOS and PECL Signal Detect
♦ Analog Received-Signal-Strength Indicator
♦ Output Squelch Function
♦ Compatible with 4B/5B Data Coding
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG CODE
MAX3969ETP -40°C to +85°C 20 Thin QFN
MAX3969E/D**
—
Dice*
T2044-2
—
*Dice are designed to operate over a -40°C to +100°C junction
temperature (T_J) range, but are tested and guaranteed only at
T_A = +25°C.
**Future product—contact factory for availability.
Typical Application Circuits
SFP OPTICAL RECEIVER WITH DIAGNOSTICS
CAZ
0.027µF
DIAGNOSTIC
MONITOR
VCC
VCC
FILT
OUT-
CIN
0.01µF
CFILTER
0.01µF
CZP CZN FILTER VCC
RSSI
SQUELCH
IN-
MAX3969
IN ^MAX3657 OUT+
GND
CIN
0.01µF
IN+
INV
R1
100kΩ
VTH
R2
VCCO
LOS
LOS
SD
OUT-
OUT+
GND
0.01µF
HOST BOARD
VCC
+2.97V TO +3.63V
RLOS
4.7kΩ
TO
10kΩ
0.1µF
150Ω
0.1µF
150Ω
Typical Application Circuits continued at end of data sheet.
Pin Configuration appears at end of data sheet.
________________________________________________________________ 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.