Altera Data Conversion HSMC Bedienungsanleitung PDF herunterladen (Seite 17)

Chapter 2: Board Components and Interfaces 2–11

Component Interfaces

A/D Converter Input SMA Connector (J4, J8)

J4 (channel A) and J8 (channel B) are standard through-hole SMA connectors used to

interface the AD9254 A/D converter input with SMA cables.

D/A Converter (U3)

The D/A converter (U3 for channels A and B) on the Data Conversion HSMC

provides 14-bit resolution and produces samples at rates up to 275 MS/s. It is a

high-speed TI DAC5672 D/A converter and is set up to drive a differential-to-single

output through a transformer. The output is transformer coupled and can be found on

the SMA connector (J12 for channel A, J14 for channel B). The output of the

TI DAC5672 D/A converter is set to the maximum output current of 20 mA. The

signal-to-noise ratio for the system is up to 60 dB for output signals from 1 MHz to the

Nyquist frequency of the converter.

Table 2–13 lists the D/A converter board reference and manufacturing information.

Table 2–14 provides the pin-out details of the D/A converter channel A and

channel B.

XT_IN_P 96 PCLK2P 9 Non-inverting Differential clock input

XT_IN_N 98 PCLK2N 10 Inverting Differential clock input

AD(A,B)_CLK_SEL_P — QP 15 Non-inverting Differential Clock Output

AD(A,B)_CLK_SEL_N — QN 14 Inverting Differential Clock Output

Table 2–12. Differential to LVDS Clock Multiplexer (U9, U10) Pin-Out Information (Part 2 of 2)

Schematic Signal

HSMC

Connector

Pin Number Device Signal

Device Pin

Number Description

Table 2–13. D/A Converter Component Reference

Board Reference Device Description Manufacturer

Manufacturing

Part Number

Manufacturer

Website

U3 14-bit, 275 MS/s D/A converter Texas Instruments DAC5672 www.ti.com

Table 2–14. D/A Converter Channel A and Channel B (U3) Pin-Out Information (Part 1 of 2)

HSMC Signal HSMC Pin Device Signal

Device Pin

Number Description

DA0 139 DA0 14 Data port A0

DA1 137 DA1 13 Data port A1

DA2 133 DA2 12 Data port A2

DA3 131 DA3 11 Data port A3

DA4 127 DA4 10 Data port A4

DA5 125 DA5 9 Data port A5

DA6 121 DA6 8 Data port A6

DA7 119 DA7 7 Data port A7

DA8 115 DA8 6 Data port A8

DA9 113 DA9 5 Data port A9

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 43 44

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