EVAL-AD7708EBZ Analog Devices Inc, EVAL-AD7708EBZ Datasheet - Page 2

• Manufacturer Part Number: EVAL-AD7708EBZ
• Description: BOARD EVAL FOR AD7708
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD7708EBZ

• Number Of Adc's: 1
• Number Of Bits: 16
• Sampling Rate (per Second): 1.37k
• Data Interface: Serial
• Inputs Per Adc: 8 Single or 4 Differential
• Input Range: ±2.5 V
• Power (typ) @ Conditions: 3.84mW @ 3 V
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD7708
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: EVAL-AD7708EB; EVAL-AD7708EB

EVAL-AD7708-EB
LINK AND SWITCH OPTIONS
There are fifteen link options which must be set for the required operating setup before using the evaluation board.
The functions of these link options are outlined below.
Link No.
LK1-LK8 These links are in series with the AIN1 through AIN8 analog inputs respectively.
L K 9
LK10
LK11
LK12
LK13
LK14&15 This option selects the master clock source for the AD7708. The master clock is generated by the
SET-UP CONDITIONS
Care should be taken before applying power and signals to the evaluation board to ensure that all link positions
are as per the required operating mode. Table 1 shows the position in which all the links are set when the
evaluation board is sent out.
Table 1: Initial Link and Switch Positions
Link No.
LK1-LK9
LK10
LK11
With these links in place, the analog inputs on the relevant SKT input is connected directly to the
respective AIN input on the part. For example, with LK1 in place, the analog input applied to SKT1
is connected directly to AIN1 of the AD7708.
This link is in series with the AINCOM analog input.
With this link in place, the analog input on SKT9 is connected directly to the AINCOM input on
the part.
This link is used to select the reference source for the REFIN2(+)/AIN9 input of the AD7708.
With this link in position "A", REFIN2(+)/AIN9 is connected to the output of the on-board reference
(AD780 - U2).
With this link in position "B", REFIN2(+)/AIN9 is connected to SKT10. An external voltage applied
to SKT10 can now be used as the REFIN2(+) for the AD7708 or as analog input AIN9, depending
on how the AD7708 is configured.
This link is used to select the reference source for the REFIN2(-)/AIN10 input of the AD7708.
With this link in position "A", REFIN2(-)/AIN10 is connected directly to AGND.
With this link in position "B", the REFIN2(-)/AIN10 is connected to SKT11. An external voltage
applied to SKT11 can now be used as the REFIN2(-) for the AD7708 or as analog input AIN10,
depending on how the AD7708 has been configured.
This link is used to select the reference source for the REFIN1(+) input of the AD7708.
With this link in position "A", REFIN1(+) is connected to the output of the on-board reference
(AD780 - U6).
With this link in position "B", REFIN1(+) is connected to SKT12. An external voltage applied to
SKT12 can now be used as the REFIN1(+) for the AD7708.
This link is used to select the reference source for the REFIN1(-) input of the AD7708.
With this link in position "A", REFIN1(-) is connected directly to AGND.
With this link in position "B", the REFIN1(-) is connected to SKT13. An external voltage applied
to SKT11 can now be used as the REFIN1(-) for the AD7708.
on-board crystal or from an external source via SKT7. This is a double link and both links must
be moved together for the correct operation of the evaluation board.
With both links in position "A", the external clock option is selected and an external clock applied
to SKT7 is routed to the XTAL1 pin of the AD7708.
With both links in position "B", the on-board crystal is selected to provide the master clock to the
AD7708.
Function
IN
Position
A
A
Function
The on-board reference (U2) provides the reference voltage for the REFIN2(+)/AIN9
input of the AD7708.
This connects the REFIN2(-)/AIN10 input of the AD7708 to AGND.
Connects analog inputs from SKT1-SKT9 to the input pins AIN1-AIN8 & AINCOM
of the AD7708.
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