EVAL-CONTROLBRD3 View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'EVAL-CONTROLBRD3' PDF : 28 Pages View PDF
Pin
No. Mnemonic
13
D4
or EXT/INT
14
D5
or INVSYNC
15
D6
or INVSCLK
16
D7
or RDC
or SDIN
17
OGND
18
OVDD
19
DVDD
20
DGND
21
D8
or SDOUT
22
D9
or SCLK
23
D10
or SYNC
AD7622
Type1
DI/O
DI/O
DI/O
DI/O
P
P
P
P
DO
DI/O
DO
Description
When SER/PAR = low, this output is used as Bit 4 of the parallel port data output bus.
When SER/PAR = high, serial clock source select. This input is used to select the internally generated
(master) or external (slave) serial data clock.
When EXT/INT = low, master mode. The internal serial clock is selected on SCLK output.
When EXT/INT = high, slave mode. The output data is synchronized to an external clock signal,
gated by CS, connected to the SCLK input.
When SER/PAR = low, this output is used as Bit 5 of the parallel port data output bus.
When SER/PAR = high, invert sync select. In serial master mode (EXT/INT = low), this input is used
to select the active state of the SYNC signal.
When INVSYNC = low, SYNC is active high.
When INVSYNC = high, SYNC is active low.
When SER/PAR = low, this output is used as Bit 6 of the parallel port data output bus.
When SER/PAR] = high, invert SCLK select. In all serial modes, this input is used to
invert the SCLK signal.
When SER/PAR = low, this output is used as bit 7 of the parallel port data output bus.
When SER/PAR = high, read during convert. When using serial master mode (EXT/INT = low),
RDC is used to select the read mode.
When RDC = high, the previous conversion result is output on SDOUT during conversion and
the period of SCLK changes (see the Master Serial Interface section).
When RDC = low (read after convert), the current result can be output on SDOUT only when
the conversion is complete.
When SER/PAR = low, serial data in. When using serial slave mode, (EXT/INT = high), SDIN could be
used as a data input to daisy-chain the conversion results from two or more ADCs onto a single
SDOUT line. The digital data level on SDIN is output on SDOUT with a delay of 16 SCLK periods after
the initiation of the read sequence. If not used, connect to OVDD or OGND.
Input/Output Interface Digital Power Ground.
Input/Output Interface Digital Power. Nominally at the same supply as the supply of the
host interface (2.5 V or 3 V).
Digital Power. Nominally at 2.5 V.
Digital Power Ground.
When SER/PAR = low, this output is used as Bit 8 of the parallel port data output bus.
When SER/PAR = high, serial data output. In serial mode, this pin is used as the serial data output
synchronized to SCLK. Conversion results are stored in an on-chip register. The AD7622 provides the
conversion result, MSB first, from its internal shift register. The data format is determined by the logic
level of OB/2C.
In master mode, EXT/INT = low, SDOUT is valid on both edges of SCLK.
In slave mode, EXT/INT = high:
When INVSCLK = low, SDOUT is updated on SCLK rising edge and valid on the next falling edge. 2
When INVSCLK = high, SDOUT is updated on SCLK falling edge and valid on the next rising edge.2
When SER/PAR = low, this output is used as Bit 9 of the parallel port data output bus.
When SER/PAR = high, serial clock. In all serial modes, this pin is used as the serial
data clock input or output, depending upon the logic state of the EXT/INT pin. The active edge
where the data SDOUT is updated, depends on the logic state of the INVSCLK pin.
When SER/PAR = low, this output is used as Bit 10 of the parallel port data output bus.
When SER/PAR = high, frame synchronization. In serial master mode (EXT/INT= low),
this output is used as a digital output frame synchronization for use with the internal data clock.
When a read sequence is initiated and INVSYNC = low, SYNC is driven high and remains high
while SDOUT output is valid.
When a read sequence is initiated and INVSYNC = high, SYNC is driven low and remains low
while SDOUT output is valid.
Rev. A | Page 9 of 28
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