EVAL-AD7766-1EDZ Analog Devices Inc, EVAL-AD7766-1EDZ Datasheet - Page 3

• Manufacturer Part Number: EVAL-AD7766-1EDZ
• Description: BOARD EVAL AD7766-1 64KSPS 111DB
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD7766-1EDZ

• Number Of Adc's: 1
• Number Of Bits: 24
• Sampling Rate (per Second): 64k
• Data Interface: Serial
• Inputs Per Adc: 1 Differential
• Input Range: ±VREF
• Power (typ) @ Conditions: 10.5mW @ 64kSPS
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 105°C
• Utilized Ic / Part: AD7766-1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Preliminary Technical Data
EVALUATION BOARD HARDWARE
POWER SUPPLIES
When using this evaluation board with the CED, incorporating the use of the ADA4841-1 amplifiers (maximum supply spread of 12V) a
+7.5V and -2.5V supply must be provided at the connector marked J12. When using J12 as the source connection to power the AD7766/-
1/-2 board then links LK1 and LK2 must be placed in position B.
The 7.5V supply to J12 is then routed through ADP3330 LDO to create the +2.5V supply to power AVDD1 (pin 1), DVDD (pin 8) and
VDRIVE (pin 9). The 7.5V is also supplied to the reference (ADR445) which creates the 5V reference signal applied to pin 2 of the
converter.
An extensive ground plane is used on this board to minimize the effect of high frequency noise interference. There in one ground plane
to which all supplies are decoupled to.
LINK OPTIONS
There are 3 link options that must be set for the required operating setup before using the evaluation board. The functions of the options
are outlined in Table 1. These options are initially setup so that the user supplies +7.5V and -2.5V to the V+ and V- terminals of J12 in
order to comply with the voltage regulations of the ADA4841-1 amplifiers (U2 & U3) as seen in the default value listed. If the user wishes
to substitute the AD8021 amplifier for ADA4841 then the CED board can be used to supply the required ±12V to the evaluation board.
See Table 1 for further details.
Table 1. Link Option Functions
Link
No.
LK1
LK2
LK3
Position
A
B
A
B
A
B
Function
This link option is used to select the source of the V+ voltage, which is used to power the evaluation board.
When using the ADA4841 amplifiers the evaluation board must be supplied with a +7.5V at the V+ terminal
at (J12).
This link option is used to select the source of the V- voltage, which is used to power the evaluation board.
When using the ADA4841 amplifiers the evaluation board must be supplied with a -2.5V at the V- terminal
at (J12).
This link option selects the source of the voltage input to the precision reference (either ADR445 or
ADR425)
V+ is supplied from the CED through the 96-way connector. Do not use this option when using the
ADA4841-1 amplifiers. In the case of use of the AD8021 amplifiers LK1 may be set to A, allowing the
AD8021 to be powered off the +12V supplied by the CED board through the 96-way connector.
In Position B, V
operate the AD7766 evaluation board using the ADA4841-1 devices.
V- is supplied from the CED through the 96-way connector. Do not use this option when using the
ADA4841-1 amplifiers. In the case of use of the AD8021 amplifiers LK2 may be set to A, allowing the
AD8021 to be powered off the -12V supplied by the CED board through the 96-way connector.
In Position B, V
operate the AD7766 evaluation board using the ADA4841-1 devices.
The V+ voltage supplied to the reference is generated by the external supply at J12 or from CED
depending on the settings used for LK1 and LK2.
Allows the user to apply an external supply directly to the reference.
DD
DD
is supplied from an external source via the power connector, J12. Set LK1 to B to
is supplied from an external source via the power connector, J12. Set LK2 to B to
Rev. PrB | Page 3 of 24
EVAL-AD7766/66-1/66-2
Default
B
B
A