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EVAL-AD7760/AD7762EDZ

Rev. PrB | Page 3 of 23

HARDWARE DESCRIPTION

POWER SUPPLIES

The EVAL-AD776xEDZ must be powered using an external power

supply that applies a 7.5 V between the V+ and GND terminals

of Connector J2.

This 7.5 V supply is then regulated on board using ADP3334

devices (U9 and U6) to provide the 2.5 V and 5 V signals required

by the AD7760/AD7762 device. Supplies AVDD2, AVDD3, and

AVDD4 are the 5 V supplies to the AD7760/AD7762 device. A

voltage of 2.5 V. supplies the AD7760/AD7762 pins AVDD1,

VDRIVE, and DVDD.

A separately regulated 2.5 V supply is used to power all digital

functionality on the EVAL-AD7760/AD7762EDZ excluding the

AD7760/AD7762 device. An individually regulated 5 V supply

also supplies the crystal oscillator and clock buffer devices on the

EVAL-AD7760/AD7762EDZ. Setting LK1 to A means that the

MCLK buffer is powered by 5 V, enabling the AD7760/AD7762

device to be operated using an MCLK signal with amplitude of

5 V.

DIFFERENTIAL INPUT

The differential input to the AD7760/AD7762 device is applied

through the connector marked J1. This is an XLR audio

standard connector. The differential inputs are routed through

the AD7760/AD7762 on-board differential amplifier using the

external circuit components as detailed in the AD7760/

AD7762 data sheets.

STANDALONE OPERATION

The EVAL-AD776xEDZ can be used in a standalone manner

(that is, without using the EVAL-CED1Z). In this case, however,

the user must provide all the required interface communications

and be able to provide a means to acquire the output data from the

board.

DECOUPLING AND LAYOUT RECOMMENDATIONS

The data sheets of the AD7760, AD7762, and AD7763 devices

contain specific information about the decoupling and layout

recommendations required to achieve the optimum specifications.

The EVAL-AD7760/AD7762EDZ adheres to these recom-

mendations completely and is designed as the blueprint for

users of the AD7760, AD7762 devices. The Gerber files for the

EVAL-AD7760/2EDZ board are available for download from

the AD7760 or AD7762 product pages at www.analog.com

The EVAL-AD7760/AD7762EDZ is 4-layer boards. One layer is

a dedicated ground plane. All supplies to devices on the EVAL-

AD7760/AD7762EDZ are decoupled to this ground plane. In

addition to the PCB’s top and bottom layers, there is also a layer

for routing power signals. All layers of the board are detailed in

the Evaluation Board Schematic and Artwork section.

In addition, the exposed paddle of an AD7760, AD7762 device

is connected by multiple vias to this ground plane. The exposed

paddle is not connected to any of the ground pins on the

AD7760, AD7762 device.

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