EVAL-AD7766/66-1/66-2
Preliminary Technical Data
Rev. PrB | Page 6 of 24
SOCKETS
There are 12 SMB input sockets relevant to the operation of the AD7766/-1/-2 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, the CED supplies their signals. 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/-1/-2 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/-1/-2 to be driven differentially.
LOGIC INPUTS
EXT_CMODE
J15
Subminiature BNC socket allowing the common mode voltage to be supplied 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, 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/-1/-2 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 EVAL-CED1Z.
When interfacing the AD7766/-1/-2 evaluation boards directly to the EVAL-CEDZ, all control signals are provided by the EVAL-CEDZ.
Sampling rates of 128 kHz, 64 KHz and 32 kHz respectively are supported when interfacing this evaluation board directly to the EVAL-
CEDZ.
Software to communicate with the EVAL-CEDZ and AD7766/-1/-2 evaluation boards is provided with the AD7766.AD7766 evaluation
board package.
The 96-way connector on the AD7766/-1/-2 evaluation board plugs directly into the 96-way connector on the EVAL-CEDZ. When using
the AD7766/-1/-2 evaluation board with the EVAL-CEDZ 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.
