Preliminary Information
This document contains information on a new product. The parametric information, although not
fully characterized, is the result of testing initial devices.
M02097-11/-21
3.3/5V LED Driver / Limiting Amplifier
for Operation to 500 Mbps
The M02097 is an integrated LED driver and limiting amplifier for applications to 500 Mbps. The LED driver
modulation output can be AC or DC coupled to an LED. The device can operate from a 3.3V or 5V supply.
The M02097 includes monitors for bias and modulation current. Integrated safety circuitry provides latched bias
and modulation current shutdown if a fault condition is detected and provides an internal V switch.
CC
The limiting amplifier also includes a programmable signal-level detector, allowing the user to set thresholds at
which the logic outputs are enabled. The M02097-11 features a PECL LOS-ST output while the M02097-21
features a CMOS (external pull-up required) LOS-ST output. PECL outputs are available on the limiting amplifier.
Configuration logic provides flexibility in setting data path polarity, safety logic configuration, and LOS behavior.
Applications
Features (con’t)
• 155Mbps LAN ATM Transceivers
• ESCON Receivers
• Fast Ethernet/FDDI
• Temperature compensation for modulation current
• Pre-bias adjustment to improve LED edge speed
• SFP compliant safety circuitry (configurable)
• Multimode LED Transmitters
• SFP Transceivers
• 6mV input limiting amp sensitivity at 500 Mbps.
• PECL limiting amplifier outputs
• IEEE 1394 S100, S200 and S400 Transceivers
• Limiting amplifier includes integrated DC offset cancellation circuit
• Polarity Control for both the driver and limiting amplifier data paths
Features
• Operates with 3.3V or 5V supply with an internal auto-sensing
regulator that enables with 5V supplies and is bypassed with 3.3V
supplies
• Powers 3.3V ROSAs from its Receiver Regulator output enabling true
3.3/5V designs using all 3.3V Mindspeed TIAs
• High speed operation; suitable for applications to 500 Mbps. 200 ps
typical rise/fall time into 5Ω.
• Programmable modulation current to 120 mA
• Integrated power supply switch for redundant shutdown under a
fault condition
M02097 Block Diagram
V 3R
CC
STSET
V R
CC
Threshold
Setting
Circuit
Regulator
with Bypass
RxOUTp
RxOUTm
RxINp
2kΩ
Output
Buffer
Limiting
Amplifier
Vttr
2kΩ
RxINm
Rx_Polarity
PECL
LOS-ST
Offset Cancel
Iref
PECL (-11)
Level
Detect
Biasing
LOS
CMOS/TTL
(-21)
Comparator
LOS-to-JAM
RSSI
LOS-ST_sel
DCR_Disable
To Safety
Logic
V T
CC
3.3V Regulator
with Bypass
V 3T
CC
TC
START
To Safety
Logic
Modulation
Control
SV
CC
TC
SLOPE
MODSET
OUT-
D
+
-
IN
4kΩ
4kΩ
Output
Buffer
Input
Buffer
Laser
Driver
OUT+
Vttx
D
GND
0
IN
Tx_Polarity
Rx_Polarity
CONFIG_1
CONFIG_2
CONFIG_3
CONFIG_4
V
V
CC3
CC
Tx_Polarity
Configuration
Logic
DCR_Disable
PB
OUT
SCB
LOS-to-JAM
Safety
LED Pre-Bias Control
Circuitry with
Latched Fault
TX
Disable
LOS-ST_sel
GND
RESET
®
02097-DSH-001-C
Mindspeed Technologies
November 2006
Preliiminary Information/Mindspeed Proprietary and Confidential