CLC5958PCASM National Semiconductor, CLC5958PCASM Datasheet - Page 14

• Manufacturer Part Number: CLC5958PCASM
• Description: EVALUATION BOARD FOR CLC5958
• Manufacturer: National Semiconductor

Specifications of CLC5958PCASM

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *CLC5958PCASM

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Evaluation Printed Circuit Board
The CLC5958 evaluation printed circuit board provides a
convenient test bed for rapid evaluation of the CLC5958. It
illustrates the proper approach to layout in order to achieve
best performance, and provides a performance benchmark.
Analog Input
The CLC5958 evaluation board is configured to be driven by
a single-ended signal at the AIN SMA connector (the AIN
connector is disconnected). The AIN SMA connector should
be driven from a 50 source impedance. A full scale input is
approximately 1.4 V
converted to a differential input by an on-board transformer.
When performing sine wave testing, it is critical that the input
sine wave be filtered to remove harmonics and source noise.
Encode Input
The CLK SMA connector is the encode input and should also
be driven from a 50
should be applied at this input. In some cases it may be
necessary to band-pass filter the sine wave in order to
achieve low jitter.
PP
source. A low jitter 16 dBm sine wave
(7 dBm). The single-ended input is
14
The single-ended clock input is converted to a differential
signal by an on-board transformer and buffered by an ECL
buffer.
Digital Outputs
The digital outputs are available at the Eurocard connector
(J1). Data bits D0 through D13 are available at J1 pins 18B
through 5B. The data ready signal (labeled DR in the sche-
matic) is available at J1 pin 20B. These outputs are also
available at the HP 01650-63203 termination adapter for
direct connection to an HP logic analyzer (see evaluation
board schematic). The outputs are buffered by 3.3V digital
latches. The falling edge of the data ready signal may be
used to latch the output data.
Supply Voltages
Power is sourced to the board through the Eurocard connec-
tor. A 5V supply should be connected at J1 pins 32A and
32B. A 3.3V supply should be connected at J1 pins 31A and
31B. The ground return for these supplies is at J1 pins 27A,
27B, 28A, and 28B. It is recommended that low noise linear
supplies be used.