MAX3945ETE Datasheet, PDF (1/24 Pages) Maxim Integrated Products – 1.0625Gbps to 11.3Gbps, SFP+ Dual-Path Limiting Amplifier

19-5144; Rev 0; 2/10
EVAALVUAAILTAIOBNLEKIT
1.0625Gbps to 11.3Gbps,
SFP+ Dual-Path Limiting Amplifier
General Description
The MAX3945 is a +3.3V, multirate, low-power limiting
amplifier optimized for Fibre Channel and Ethernet trans-
mission systems at data rates up to 11.3Gbps. The high-
sensitivity limiting amplifier limits the signal generated by
a transimpedance amplifier into a CML-level differential
output signal. All differential inputs and outputs (I/O) are
optimally back terminated for 50I transmission line PCB
design. The MAX3945’s dual-path limiting amplifier has
programmable filtering to optimize sensitivity for differ-
ent data rates and to suppress relaxation oscillations
that could occur in some optical systems. The MAX3945
incorporates two loss-of-signal (LOS) circuits and a pro-
grammable time mask for the LOS output.
A 3-wire digital interface reduces the pin count and
enables control of LOS threshold, LOS polarity, LOS
mode, CML output level, input offset correction, receive
(Rx) polarity, Rx input filter, and Rx deemphasis without
the need for external components.
The MAX3945 is packaged in a 3mm x 3mm, 16-pin
TQFN package.
Applications
1x/2x/4x/8x SFF/SFP/SFP+ MSA Fibre-Channel
Optical Transceiver
10GBASE-SR/LR SFP+ Optical Transceiver
10G PON ONU
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX3945ETE+
-40NC to +85NC
16 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Application Circuit appears at end of data sheet.
Features
S 130mW Power Dissipation Enables < 1W SFP+
Modules
S Enables Single-Module Design Compliance
with 1000BASE-SX/LX and 10GBASE-SR/LR
Specifications
S -25.3dBm Optical Sensitivity at 1.25Gbps Using a
10.32Gbps ROSA
S Selectable 1GHz/2.1GHz/2.5GHz/3GHz Input Filters
at RATE_SEL = 0 Setting
S Supports SFF-8431 SFP+ MSA and SFF-8472
Digital Diagnostic
S Total Power Dissipation of 130mW at 3.3V Power
Supply with RSSI Monitor-Based LOS
S Total Power Dissipation of 154mW at 3.3V Power
Supply with Rx Input-Based LOS
S 4mVP-P Input Sensitivity at 11.3Gbps
S 4psP-P DJ at 11.3Gbps with RATE_SEL = 1
S 4psP-P DJ at 8.5Gbps with RATE_SEL = 1
S 5psP-P DJ at 4.25Gbps with RATE_SEL = 0,
BW1 = 1, BW0 = 1
S 9.0psP-P DJ at 1.25Gbps with RATE_SEL = 0,
BW1 = 0, BW0 = 0
S 26ps Rise and Fall Time with RATE_SEL = 1
S 52ps Rise and Fall Time with RATE_SEL = 0
S CML Output with Level Adjustment and Squelch
Mode
S Programmable CML Output Deemphasis
S CML Output Polarity Select
S LOS Polarity Select
S Programmable Masking Time for the LOS Output
S LOS Assert/Deassert Level Adjustment
S Choice of Rx Input-Based LOS or RSSI Monitor-
Based LOS
S 3-Wire Digital Interface Compatible with Maxim’s
SFP+ Family of Products
________________________________________________________________ Maxim Integrated Products   1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.