e2v AT84CS001-EB, User Manual

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AT84CS001-EB Evaluation Kit User Guide 3-1
0904C–BDC–09/07
Section 3
Operating Characteristics
3.1 Introduction
This section describes a typical configuration for operating the evaluation board of the
AT84CS001 1:2/4 10-bit 2.2 GHz DMUX.
3.2 Operating
Procedure
The procedure described below helps you operate the evaluation board for the first time.
It described the steps to accomplish a BIST in order to verify whether the board is func-
tional or not. At the end of the procedure, the DMUX is in the following configuration:
BIST, 1:4 ratio, CLKTYPE = CLK/2, DRTYPE = DR/2, simultaneous mode, no SLEEP.
Note: Do not switch the power supplies until all power connections on the evaluation
board are established.
1. Connect the power supplies and ground accesses through the dedicated banana
jacks. V
CCD
= 3.3V, V
PLUSD
= 2.5V and 3.3V.
2. Connect the clock input signals (CLK, CLKN). This clock may be single-ended or
differential. Use a low-phase noise high frequency generator. You should use an
LVDS signal to drive the input clock.
In single-ended mode, CLK must have a common mode voltage equal to 1.25V
and CLKN should be connected to a constant value equal to 1.25V. For a differ-
ential signal use an LVDS buffer. The clock frequency can range from 1 MHz up
to 1.1 GHz (CLK/2 mode) or 2.2 GHz (CLK mode).
3. Remove the jumpers on CLKTYPE, DRTYPE, RS, DAEN, SLEEP and STAGG.
The only remaining jumper is on BIST.
4. Connect the high-speed acquisition system probes to the output connectors.
The digital data are differentially terminated on-board (100
Ω
) but, they can be probed
either in differential or in single-ended mode.
All instrumentation and connectors are now connected.
5. Switch on the power supplies (recommended power up sequence: simultaneous
or in the following order: V
CCD
= 3.3V, V
PLUSD
= 2.5V and 3.3V).