AD9268BCPZ-105 Analog Devices Inc, AD9268BCPZ-105 Datasheet - Page 35

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AD9268BCPZ-105

Manufacturer Part Number
AD9268BCPZ-105
Description
Dual 16 Bit 105 High SNR ADC
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD9268BCPZ-105

Design Resources
Powering AD9268 with ADP2114 for Increased Efficiency (CN0137)
Number Of Bits
16
Sampling Rate (per Second)
105M
Data Interface
Serial, SPI™
Number Of Converters
2
Power Dissipation (max)
590mW
Voltage Supply Source
Analog and Digital
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
64-LFCSP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

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Manufacturer
Quantity
Price
Part Number:
AD9268BCPZ-105
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Quantity:
530
SERIAL PORT INTERFACE (SPI)
The AD9268 serial port interface (SPI) allows the user to configure
the converter for specific functions or operations through a
structured register space provided inside the ADC. The SPI
gives the user added flexibility and customization, depending on
the application. Addresses are accessed via the serial port and
can be written to or read from via the port. Memory is organized
into bytes that can be further divided into fields, which are docu-
mented in the Memory Map section. For detailed operational
information, see the AN-877 Application Note, Interfacing to
High Speed ADCs via SPI.
CONFIGURATION USING THE SPI
Three pins define the SPI of this ADC: the SCLK/DFS pin, the
SDIO/DCS pin, and the CSB pin (see Table 14). The SCLK/DFS
(a serial clock) is used to synchronize the read and write data
presented from and to the ADC. The SDIO/DCS (serial data
input/output) is a dual-purpose pin that allows data to be sent
to and read from the internal ADC memory map registers. The
CSB (chip select bar) is an active-low control that enables or
disables the read and write cycles.
Table 14. Serial Port Interface Pins
Pin
SCLK
SDIO
CSB
SCLK
SDIO
CSB
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DON’T CARE
Function
Serial Clock. The serial shift clock input, which is used to
synchronize serial interface reads and writes.
Serial Data Input/Output. A dual-purpose pin that
typically serves as an input or an output, depending on
the instruction being sent and the relative position in the
timing frame.
Chip Select Bar. An active-low control that gates the read
and write cycles.
t
S
R/W
t
DS
W1
W0
t
DH
A12
t
HIGH
A11
Figure 84. Serial Port Interface Timing Diagram
t
LOW
A10
A9
Rev. A | Page 35 of 44
t
CLK
A8
A7
The falling edge of the CSB, in conjunction with the rising edge
of the SCLK, determines the start of the framing. An example of
the serial timing and its definitions can be found in Figure 84
and Table 5.
Other modes involving the CSB are available. When the CSB is
held low indefinitely, which permanently enables the device,
this is called streaming. The CSB can stall high between bytes to
allow for additional external timing. When CSB is tied high, SPI
functions are placed in high impedance mode. This mode turns
on any SPI pin secondary functions.
During an instruction phase, a 16-bit instruction is transmitted.
Data follows the instruction phase, and its length is determined
by the W0 and W1 bits.
In addition to word length, the instruction phase determines
whether the serial frame is a read or write operation, allowing
the serial port to be used both to program the chip and to read
the contents of the on-chip memory. The first bit of the first byte in
a multibyte serial data transfer frame indicates whether a read
command or a write command is issued. If the instruction is a
readback operation, performing a readback causes the serial
data input/output (SDIO) pin to change direction from an input to
an output at the appropriate point in the serial frame.
All data is composed of 8-bit words. Data can be sent in MSB-first
mode or in LSB-first mode. MSB first is the default on power-up
and can be changed via the SPI port configuration register. For
more information about this and other features, see the AN-877
Application Note, Interfacing to High Speed ADCs via SPI.
D5
D4
D3
D2
D1
D0
t
H
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AD9268
DON’T CARE

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