212X4-DSH-001-B Datasheet, PDF (6/19 Pages) M/A-COM Technology Solutions, Inc. – M21204/M21214 SD and HD Cable Equalizers

1.0 Functional Description
1.1
Pin Descriptions
1.1.1
General Nomenclature
Through out this data sheet, physical pins will be denoted in BOLD print. An array of pins can be called by each
individual pin name (e.g. MF0, MF1, MF2, MF3, and MF6) or as an array (e.g. MF[6, 5..0] or MF[6:0]).
1.1.2
High-Speed Input
Digital video coaxial cables are AC coupled to the high-speed low-noise inputs, SDI/SDI, which, are designed to
operate in both the single-ended or differential mode. The typical application is single-ended into the non-inverting
SDI input with the inverting SDI input biased to match the bias on the used input.
For GS9064/GS1524 drop-in compatibility, the M21204/M21214 do not contain any internal input terminations and
require both external input termination as well as the matching circuit to exceed the SMPTE input return loss
specifications. The package and IC design of the M21204/M21214 have been optimized for high-speed
performance allowing them to exceed the SMPTE return loss spec by 5dB to 10dB using the recommended
external matching/termination network and commonly employed through-hole, or vertical mount 75Ω BNC
connectors. For non-inverting single-ended operation, the recommended input circuit is shown in Figure 1-1. For
differential operation, the matching/termination circuit on SDI should be duplicated on SDI. The internal pull ups
automatically bias SDI/SDI to 0.72 x AV_DD for proper AC coupled operation.
Figure 1-1. Single-ended Typical Input Matching/Termination Network
BNC
8.2 nH
75Ω
4.7uF
75Ω
4.7uF
37.5Ω
M21204
M21214
SDI
SDI
212x4-DSH-001-B
Mindspeed Technologies^®
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