M21245 Datasheet, PDF (1/50 Pages) M/A-COM Technology Solutions, Inc. – 3G/HD/SD-SDI Multi-rate Reclocker

M21245
3G/HD/SD-SDI Multi-rate Reclocker
The M21245 is a serial digital video reclocker with integrated trace equalization and automatic rate detect (ARD) circuitry. It operates at
SDI data rates ranging from 270 Mbps to 2970 Mbps and is compliant to SMPTE 424M, SMPTE 292, and SMPTE 259M-C. At
270 Mbps it also supports DVB-ASI.
The M21245 has an input jitter tolerance (IJT) of greater than 0.6 unit intervals (UI) and can provide retimed serial outputs with very low
output jitter. The reclocker requires a single external 27 MHz crystal, which is used as the reference clock for all four channels. It
includes per-lane analog input equalization for up to 40" of FR4 trace and two connectors in addition to output de-emphasis.
This device features integrated supply regulators allowing it to be powered from 1.2 V, 1.8 V, 2.5 V, or 3.3 V supply voltages. When
operating at 1.2 V, it consumes only 230 mW at 3G-SDI. Furthermore, the power rails for the core, input, and output circuitry are
electrically independent and as such may be connected to different voltage rails on the board. This feature allows the M21245 to be
DC-coupled to any upstream or downstream device regardless of its input/output voltage level.
The device may be configured by setting the internal registers though standard two-wire and four-wire interfaces.
The M21245 is offered in a green and RoHS compliant, 6 mm x 6 mm, 40-pin QFN package.
Applications
• 3G/HD/SD-SDI Video Switchers
• 3G/HD/SD-SDI Video Routers
• 3G/HD/SD-SDI Video Distribution Amplifiers
• DVB-ASI Equipment
Features
• SMPTE 259-C, 292, 424M, and DVB ASI Compliant
• Greater than 0.6 UI Input Jitter Tolerance
• Integrated 50 Ω input termination
• Input equalization and output de-emphasis for 40" of FR4 trace
• 230 mW power consumption (1.2 V operation)
• Integrated regulators for multi-voltage operation (1.2 V - 3.3 V)
• Electrically independent input, output, and core supply rails
• Output enable/disable and configurable auto or manual bypass mode
• Automatic and manual modes for rate indication and selection
• Loss of Lock (LOL), Loss of Signal (LOS) and data rate Indication
• Two-wire and four-wire serial interface programmability
• Industrial operating temperature range (-40 °C to +85 °C)
• Optional recovered serial clock output
M21245 Block Diagram
SDI0P
SDI0N
IE
SDI1P
IE
SDI1N
SDI2P
SDI2N
IE
SDI3P
SDI3N
IE
4:1
Mux
Reclocker
50Ω Buffer
W/ DE
50Ω Buffer
W/ DE
SDOAP
SDOAN
SDOB/SCLKOP
SDOB/SCLKON
21245-DSH-001-H
Mindspeed Technologies^®
Mindspeed Proprietary and Confidential
July 2012