AD9831ASTZ

AD9831ASTZ Datasheet


Evaluation Board for the AD9831 Direct Digital Synthesizer

Part Datasheet
AD9831ASTZ AD9831ASTZ AD9831ASTZ (pdf)
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Evaluation Board for the AD9831 Direct Digital Synthesizer

EVAL-AD9831EB

FEATURES Full-Featured Evaluation Board for the AD9831 Various Linking Options PC Software for Control of AD9831
source via a BNC connector. Latches 74HC574 are also on the board, these latches being used to hold the 16-bit data word being written from the PC to the AD9831.

INTRODUCTION This Application Note describes the evaluation board for the AD9831 Direct Digital Synthesizer DDS . The AD9831 is a numerically controlled oscillator employing a phase accumulator, a sine look-up table and a 10-bit D/A converter. The part can be operated with clock frequencies up to 25 MHz. Both phase modulation and frequency modulation can be performed with the AD9831. Full data on the AD9831 is available in the AD9831 datasheet available from Analog Devices and should be consulted in conjunction with this Application Note when using the evaluation board.

The evaluation board interfaces to the parallel port of an IBM compatible PC. Software is available with the evaluation board which allows the user to easily program the AD9831.

Components on the AD9831 Evaluation Board include a 25 MHz oscillator which provides the MCLK for the AD9831. The user can remove this oscillator, if required, and drive the AD9831 with a different clock oscillator or an external clock

OPERATING THE AD9831 EVALUATION BOARD

Power Supplies This evaluation board has two analog power supply inputs AVDD and AGND. AVDD equals +5 V or V and is used to provide the AVDD for the AD9831. DGND and DVDD connections are also available. The DVDD is used to provide the DVDD for the AD9831, the 25 MHz oscillator and the DVDD for the logic chips. DGND and AGND are connected at the AD9831. Therefore, it is recommended not to connect AGND and DGND elsewhere in the system.

All power supplies are decoupled to ground. AVDD and DVDD are decoupled using 10µF tantalum capacitors and 0.1µF ceramic capacitors at the input to the evaluation board. The power supplies are again decoupled using 0.1µF capacitors at the AD9831, the crystal and the logic.

Evaluation Board Setup

AD9831.EXE

IBM Compatible PC

Parallel Port Centronics Printer Cable

AD9831 Evaluation Board

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

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Cables ANALOG NORWOOD MASS

EVAL-AD9831EB

Link and Switch Options There are five link options which must be set for the required operating setup before using the evaluation board. The functions of these options are outlined below.

Link No. LK1

LK4 LK5

Function The PSEL1 input can be controlled by the user via a BNC connector or, alternatively, by switch SW.

When LK1 is arranged so that PSEL1 is connected to SW, the user can control the PSEL1 signal using the double throw switch.

Alternatively, PSEL1 can be tied to a BNC connector by altering LK1 so that the user can provide the PSEL1 control from a logic source.

The PSEL0 input can be controlled by the user via a BNC connector or, alternatively, by switch SW.

When LK2 is arranged so that PSEL0 is connected to SW, the user can control the PSEL0 signal using the double throw switch.

Alternatively, PSEL0 can be tied to a BNC connector by altering LK2 so that the user can provide the PSEL0 control from a logic source.

The FSELECT input can be controlled by the user via a BNC connector or, alternatively, by switch SW.

When LK3 is arranged so that FSELECT is connected to SW, the user can control the FSELECT signal using the double throw switch.

Alternatively, FSELECT can be tied to a BNC connector by altering LK3 so that the user can provide the FSELECT control from a logic source.

LK4 is used to place the AD9831 in sleep mode.

When LK4 is connected so that SLEEP is tied to DGND, the AD9831 is placed in sleep mode whereby the

AD9831's internal clocks, REFOUT and the DAC are disabled.

When LK4 is connected so that SLEEP is tied to DVDD, the AD9831 is powered up.

The reference to the AD9831 can be provided by the on-board reference, which is available at REFOUT, or an external reference of nominal value V can be used. When LK5 is closed, the on-board reference is used. When this link is opened, REFIN is disconnected from REFOUT and the reference can be provided by the user via a BNC connector.

Preliminary Technical Data

EVAL-AADD987310E0B2
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Datasheet ID: AD9831ASTZ 517791