212X4-DSH-001-B Datasheet, PDF (1/19 Pages) M/A-COM Technology Solutions, Inc. – M21204/M21214 SD and HD Cable Equalizers

M21204/M21214 SD and HD Cable Equalizers
The M21204/M21214 are high-speed, low-power, adaptive co-axial cable equalizers designed to increase the
maximum low-jitter transmission distance of serial digital interface (SDI) video signals and DVB-ASI across
commonly used bandwidth-limiting 75Ω coaxial cable. These devices automatically optimize their transfer function
based on the bit rate and cable length to minimize the inter-symbol interference (ISI) jitter caused by the cable and
to remove the DC offset components introduced with the pathological test pattern and AC coupling in systems.
The M21214 is designed to support at SD and HD data rates from 143 Mbps and 1485 Mbps. The M21204 is
designed to support SD data rates between 143 Mbps and 540 Mbps. The low-noise, high-gain equalizer allows for
low jitter HD transmissions up to a length of 200m (Belden 1694A) and 120m (Belden 8281). For SD data rates,
cable lengths up to 400m (Belden 1694A) and 300m (Belden 8281) are supported.
The M21214 is designed to be a pin-for-pin compatible drop-in replacement for the legacy GS1524, while the
M21204 is a pin-for-pin compatible drop-in replacement for the legacy GS9064. These devices offer lower power
dissipation, a choice of a 2.5V or 3.3V power supply, for new designs, and increased typical input return loss of 25
dB, depending on installed input BNC connector.
Applications
• SMPTE Coaxial Cable Interface
• Studio video applications
• Broadcast video applications
• Distribution video applications
Standards Compliance
• SMPTE 259M, SMPTE 292M, SMPTE 344M
(at appropriate data rates)
• DVB-ASI (270 Mbps)
Features
• SMPTE/DVB-ASI compliant at SD and HD (M21214)
• SMPTE/DVB-ASI compliant at SD (M21204)
• Pin for Pin and functionally compatible with GS1524 (M21214)
• Pin for Pin and functionally compatible with GS9064 (M21204)
• Interchangeable PCB footprint for all three devices
• 2.5V or 3.3V Supply
• Low Power (175 mW @ 2.5V, 230 mW @ 3.3V)
• 25 dB typical input return loss with existing matching circuit
• Extended Temperature range: –10 to 85 °C
Functional Block Diagram
EQ_BYP
SDI
INPUT
BUFFER
SDI
EQUALIZER
CORE
M21204/M21214
Cable Equalizer
AGC AGC
1
DC
RESTORE
0
CABLE
LENGTH
INDICATOR
OUTPUT
BUFFER
MUTE
CONTROL
CLEN
SD/MUTE
212x4-DSH-001-B
Mindspeed Technologies^®
Mindspeed Proprietary and Confidential
SDO
SDO
THRESH
April 2007