EVAL-AD7766/AD7767
Preliminary Technical Data
SOCKETS
There are 12 SMB input sockets relevant to the operation of the AD7766/AD7767 on this evaluation board. All of these sockets are used
for applying an externally generated signal to the evaluation board. When operating the board with the CED, the only external sockets
necessary are those used to supply the analog inputs to the ADC (that is, VA, VB). All of the other sockets are optional and if they are not
used, their signals are supplied by the CED. Most of these sockets are used when operating the board as a standalone unit, as all the
signals required are supplied from external sources. The functions of these sockets are outlined in Table 3.
Table 3. Socket Functions
Socket Designator
Function
ANALOG INPUTS
DIFFERENTIAL
INPUT
J4
XLR socket allowing a differential input from an audio cable to be applied to the AD7766/67 driving
circuitry.
SINGLE
ENDED
INPUT
J2
Subminiature BNC socket allowing a single-ended analog input to be split and routed to each of the
AD4841-1 amplifiers, allowing the AD7766/67 to be driven differentially.
LOGIC INPUTS
EXT_CMODE J15
Subminiature BNC socket allowing the common mode voltage to be supplied from an from an external
source.
MCLK
J7
Subminiature BNC socket allowing application of an external MCLK input.
SCLK J9 Subminiature
BNC
socket for SCLK output.
SDO
J8
Subminiature BNC socket for an external SDO input.
CS
J5
Subminiature BNC socket allowing application of an external CS input.
SYNC/PD
J10
Subminiature BNC socket allowing application of an external SYNC/PD input. The . SYNC/PD pin can be
controlled using an external source, or using the software front panel button, or otherwise through the
hardware button marked S2.
SDI
J6
Subminiature BNC socket for an external SDI input.
DRDY
J11
Subminiature BNC socket for an external DRDY input.
CONNECTORS
There are four connectors on the AD7766/AD7767 evaluation board as outlined in Table 4.
Table 4. Connector Functions
Connector Function
J1
96-way connector for the digital interface and power supply connections to the CED board.
J3
External voltage supply to the ADR425 or ADR445.
J12
External V+, V- and GND power connector. Use this connector in conjunction with the default amplifier
ADA4841-1.l
J13 External
V
DRIVE
, and DGND power connector.
OPERATING WITH THE CED
The evaluation board can be operated in a standalone mode or operated in conjunction with the CED.
When interfacing the AD7766/AD7767 evaluation boards directly to the CED, all control signals are provided by the CED. Sampling rates
of 128kHz, 64Khz and 32kHz respectively are supported when interfacing this evaluation board directly to the CED.
Software to communicate with the CED and AD7766/AD7767 evaluation boards is provided with the AD7766.AD7767 evaluation board
package.
The 96-way connector on the AD7766/AD7767 evaluation board plugs directly into the 96-way connector on the CED. When using the
AD7766/67 evaluation board with the CED board the board must be powered off +7.5V and -2.5V external supplies, in order to operate
the ADA4841-1 Amplifiers within the maximum ratings..
Rev. PrA | Page 6 of 20
