AD7623AST Analog Devices Inc, AD7623AST Datasheet - Page 9

• Manufacturer Part Number: AD7623AST
• Description: IC ADC 16BIT 1.33MSPS DFF 48LQFP
• Manufacturer: Analog Devices Inc
• Series: PulSAR®r

Specifications of AD7623AST

• Number Of Bits: 16
• Sampling Rate (per Second): 1.33M
• Data Interface: Serial, Parallel
• Number Of Converters: 1
• Power Dissipation (max): 55mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• For Use With: EVAL-AD7623CBZ - BOARD EVALUATION FOR AD7623
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Pin No.
16
17
18
19
20
21
22
23
24
25 to 28
29
30
31
32
33
34
Mnemonic
D7
or RDC
or SDIN
OGND
OVDD
DVDD
DGND
D8
or SDOUT
D9
or SCLK
D10
or SYNC
D11
or RDERROR
D[12:15]
BUSY
DGND
RD
CS
RESET
PD
Type
DI/O
P
P
P
P
DO
DI/O
DO
DO
DO
DO
P
DI
DI
DI
DI
1
Description
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 read during current conversion and the period of
SCLK changes (see the Master Serial Interface section).
When RDC = low (read after convert), the current result is read after conversion.
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.
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 AD7623 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.
When INVSCLK = high, SDOUT is updated on SCLK falling edge and valid on the next rising edge.
Parallel Port Data Output Bus Bit 9. When SER/PAR = low, this output is used as Bit 9 of the parallel port
data output bus.
Serial Clock. When SER/PAR = high, serial clock. In all serial modes, this pin is used as the serial data
clock input or output, dependent on 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.
Parallel Port Data Output Bus Bit 11. When SER/PAR = low, this output is used as Bit 11 of the parallel
port data output bus.
Read Error. When SER/PAR = high, read error. In serial slave mode (EXT/INT = high), this output is used
as an incomplete read error flag. If a data read is started and not completed when the current
conversion is complete, the current data is lost and RDERROR is pulsed high.
Bit 12 to Bit 15 of the Parallel Port Data Output Bus.
Busy Output. Transitions high when a conversion is started, and remains high until the conversion is
complete and the data is latched into the on-chip shift register. The falling edge of BUSY can be used
as a data ready clock signal.
Digital Power Ground.
Read Data. When CS and RD are both low, the interface parallel or serial output bus is enabled.
Chip Select. When CS and RD are both low, the interface parallel or serial output bus is enabled. CS is
also used to gate the external clock in slave serial mode.
Reset Input. When high, reset the AD7623. Current conversion if any is aborted. Falling edge of RESET
enables the calibration mode indicated by pulsing BUSY high. Refer to the Digital Interface section. If
not used, this pin can be tied to DGND.
Power-Down Input. When high, power down the ADC. Power consumption is reduced and conversions
are inhibited after the current one is completed.
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AD7623