Altera Data Conversion HSMC Bedienungsanleitung PDF herunterladen (Seite 13)

Chapter 2: Board Components and Interfaces 2–7

Component Interfaces

External Clock Output SMA Connectors (J25, J28)

The CLK SMA connector (J25 or J28) provides an external clock output. Different

clocks can be selected by using differential LVDS multiplexer (U13) and clock select

jumper (J23) (Figure 2–4). The external clock source provides (while using a particular

design) the flexibility to alter the input frequency to verify f

MAX

tolerances. If you

choose to use a single-ended clock, R110 must be removed and R109 be installed.

Component Interfaces

This section describes the user interfaces, which consist of the A/D converter, D/A

converter, audio CODEC converter, HSMC connector, and I

C Serial EEPROM.

A/D Converter (U1, U2)

The Data Conversion HSMC contains two AD9254 14-bit 150 MS/s A/D converters.

This device is designed for high-speed and high-performance applications.

The inputs to these A/D converters are transformer-coupled in order to create a

balanced input. The signal-to-noise ratio for the system is up to 72 dB for input signals

from 1 MHz to the Nyquist frequency of the converter. The maximum differential

input voltage to the converter is 2 VPP. Usable voltage input to the SMA connector is

approximately 512 mV when driven from a 50-Ω source.

Table 2–9 lists the A/D converter board reference and manufacturing information.

Figure 2–4. External Clock Output Schematic

External Clock Out

J25LTI-SASF54GT

XT_CK_OUT_N

J28

5432

XT_CK_OUT_P

Unipolar

XT_CK_OUT_UNI

R110

Bipolar

XT_CK_OUT_BI

ADT1_1WT

RX_CLK_P

RX_CLK_N

LTI-SASF54GT

R109

5432

Table 2–9. A/D Converter Component Reference

Board Reference Device Description Manufacturer

Manufacturing

Part Number

Manufacturer

Website

U1, U2 14-bit, 150 MS/s A/D converter Analog Device AD9254 www.analog.com

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 43 44

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