8T49N24x Evaluation Board User Guide
Introduction
The 8T49N240, 8T49N241 and 8T49N242 evaluation boards are designed to help the customer evaluate the 8T49N240i, 8T49N241, and
8T49N242 devices, respectively. For the sake of simplicity this User Guide refers to the 8T49N242i evaluation board though all
statements also apply to the 8T49N240 and 8T49N241 evaluation board. When the board is connected to a PC running IDT Timing
Commander™ Software through USB, the device can be configured and programmed to generate frequencies with best-in-class
performances.
Requirements
▪
PC Requirements:
— IDT Timing Commander Software Installed
— USB 2.0 or 3.0 interface
— Windows XP SP3 or later
— Processor: Minimum 1GHz
— Memory: Minimum 512MB, recommended 1GB
— Available Disk Space: Min 600MB (1.5GB, 64-bit), recommended 1GB (2GB 64-bit)
— Network access during installation if the .NET framework is not currently installed on the system
▪
Power Supply with 3.3V and 1000mA rating
▪
Four banana plug cables to connect the power supply to the board
Quick Start: Powering Up the Board
1. Set 3.3V supply current limit to 500mA.
2. Remove all output terminations.
3. Set Dip Switch selectors to the middle position.
4. Connect a cable from a PC to the USB port.
5. Connect VEE to the GND jack.
6. Connect 3.3V to Vcc_J, Vcca_J, and Vcco_J jacks.
7. Power on the Power Supply.
8. Press the Reset Button.
Once correct operation is verified, set the power supply limit for the number of outputs to be active.
The USB port must be powered by the PC in order to have the correct I
2
C bus voltage levels.
Default Power-Up Condition
The 8T49N241 and 8T49n242 boards ship with a 38.88MHz surface-mount crystal populated on the top of the board. The 8T49N240
board ships with a 49.152MHz crystal. If a different crystal frequency is needed, this part must be removed (for more information, see
Crystal Interface).
All outputs should be off and the current should measure ~236mA with 3.3V on Vcc_J, Vcca_J, and Vcco_J.
When evaluating performance with the default hardware configuration, it is recommended that all active outputs be terminated 50ohms to
VEE by either terminator plugs or an instrument.
©2017 Integrated Device Technology, Inc.
1
June 6, 2017
8T49N24x Evaluation Board User Guide
Legend–Evaluation Board
Inputs
CLK0_S
CLK0
CLK1
Clock 0 sense lines.
Clock 0 input lines. Can be configured for differential or single-ended input.
Clock 1 input lines. Can be configured for differential or single-ended input.
Outputs
Q0
Q1
Q2
Q3
Output Q0. Can be a differential pair or two individual single-ended outputs.
Output Q1. Can be a differential pair or two individual single-ended outputs
Output Q2. Can be a differential pair or two individual single-ended outputs.
Output Q3. Can be a differential pair or two individual single-ended outputs.
Other
A
B
C
D
E
F
G
H
I
J
K
L
M
Dip Switch for DC control signals (EEPROM_WP, S_A0/1, nWP)
Vcca_J
Vcc_J
GND
Vcco_J
RESET
IDT8T49N24x- the device to be evaluated
OSCI crystal overdrive connector (not installed by default)
Crystal connectors (HC49/US through-hole socket and 3.2x2.5 SMD footprint)
GPIO test points
I2C test points
EEPROM socket (AT24C04C)
USB connector
©2017 Integrated Device Technology, Inc.
3
June 6, 2017
8T49N24x Evaluation Board User Guide
Software GUI Overview
The 8T49N24x devices are programmed using IDT's Timing Commander software, which provides an interactive and intuitive Graphical
User Interface to program and adjust the many settings that are available for the devices. Timing Commander is the generic platform
upon which many devices' GUIs run on. Each GUI has a file called a “personality” that is loaded by Timing Commander so that it can
interface with the supported devices. Timing Commander installation and personality files, as well as tutorials and support are available at
http://www.idt.com/products/clocks-timing/timing-commander-software-download-resource-guide.
The GUI for the 8T49N24x devices is
shown below.
Figure 2. Timing Commander 8T49N24x GUI
©2017 Integrated Device Technology, Inc.
4
June 6, 2017
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
