EVAL-AD7730LEB
REV. B
2
Link Options
There are a number of link options on the evaluation board which should be set for the required operating setup before using
the board. The functions of these link options are described in detail below.
Link No.
Function
LK1
This option selects the master clock option for the AD7730L. The master clock source comes from the on-board
crystal or from an external clock source via SKT11. This is a double link and both links must be moved together
for correct operation.
With both links in position A, the external clock option is selected and an externally applied clock to SKT 11 is
routed to the MCLK IN pin of the AD7730L.
With both links in position B, the on-board crystal is selected and provides the master clock for the AD7730L.
LK2
This link option is used to determine whether the AD7730L is in its normal operating mode or its
STANDBY
(power-down) mode.
With this link in position A, the
STANDBY
input of the AD7730L is connected to a logic high thus configuring
the part for normal operation.
With this link in position B, the
STANDBY
input of the AD7730L is connected to a logic low and the AD7730L
is placed in its power-down mode where its power dissipation is typically 100µW.
LK3
This link option is used to select the reference source for the AD7730L's REF IN(-) input.
With this link in position A, the REF IN(-) pin of the AD7730L is connected to SKT10. An external voltage
connected to SKT10 can now be used for REF IN(-).
With this link in position B, the REF IN(-) pin of the AD7730L is connected directly to AGND.
LK4
This link controls the polarity of the serial clock.
With this link in position A, the POL pin of the AD7730L is connected to a logic high. With this input high, the
first transition of the serial clock in a data transfer is from a high to a low. This link should be in position A when
operating with the evaluation board software.
With this link in position B, the POL pin of the AD7730L is connected to a logic low. With this input low, the first
transition of the serial clock in a data transfer is from a low to a high.
LK5
This link option is used to select the reference source for the AD7730L's REF IN(+) input.
With this link in position A, the REF IN (+) pin of the AD7730L is connected directly to the output of the on-board
reference, the AD780.
With this link in position B, the REF IN (+) pin of the AD7730L is connected directly to AV
DD
.
With this link in position C, the REF IN(+) pin of the AD7730L is connected to SKT9. An external voltage connected
to SKT9 can now be used for REF IN(+).
LK6
This link is in series with the
ACX
pin.
With this link in place, SKT5 provides the
ACX
signal from the AD7730L.
LK7
This link is in series with the ACX pin.
With this link in place, SKT6 provides the ACX signal from the AD7730L.
LK8
This link is in series with the AIN2(+)/D1 pin.
With this link in place, SKT8 is connected directly to the AIN2(+)/D1 pin.
This link may be removed so that an analog input signal at SKT8 can be connected to the component grid for signal
conditioning before being applied to the AIN2(+) input of the AD7730L.
LK9
This link is in series with the AIN2(-)/D0 pin.
With this link in place, SKT7 is connected directly to the AIN2(-)/D0 pin.
This link may be removed so that an analog input signal at SKT7 can be connected to the component grid for signal
conditioning before being applied to the AIN2(-) input of the AD7730L.
LK10
This link is in series with the AIN1(+) analog input.
With this link in place, the analog input on the SKT3 input is connected directly to the AIN1(+) input on the
part.
This link may be removed so that the input signal at SKT3 can be connected to the component grid for
signal conditioning before being applied to the AIN1(+) input of the AD7730L.
Содержание EVAL-AD7730LEB
Страница 7: ...EVAL AD7730LEB REV B 7 Figure 6 Mode Register Screen Figure 5 Program Screen ...
Страница 8: ...EVAL AD7730LEB REV B 8 Figure 7 AD7730L Evaluation Board Circuit Diagram ...
Страница 10: ...EVAL AD7730LEB REV B 10 Figure 8 Component Layout diagram ...
Страница 11: ...EVAL AD7730LEB REV B 11 Figure 9 Component Side Artwork Diagram ...
Страница 12: ...EVAL AD7730LEB REV B 12 Figure 10 Solder Side Artwork Diagram ...
