AD9254-150EBZ Analog Devices Inc, AD9254-150EBZ Datasheet - Page 22

• Manufacturer Part Number: AD9254-150EBZ
• Description: 1.8V 14Bit 150 MSPS ADC EB
• Manufacturer: Analog Devices Inc

Specifications of AD9254-150EBZ

• Number Of Adc's: 1
• Number Of Bits: 14
• Sampling Rate (per Second): 150M
• Data Interface: Serial
• Inputs Per Adc: 1 Differential
• Input Range: 2 Vpp
• Power (typ) @ Conditions: 506mW @ 150MSPS
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD9254
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD9254
MEMORY MAP
READING THE MEMORY MAP REGISTER TABLE
Each row in the memory map register table has eight address
locations. The memory map is roughly divided into three
sections: the chip configuration registers map (Address 0x00 to
Address 0x02), the device index and transfer registers map
(Address 0xFF), and the ADC functions map (Address 0x08 to
Address 0x18).
Table 15 displays the register address number in hexadecimal in
the first column. The last column displays the default value for
each hexadecimal address. The Bit 7 (MSB) column is the start
of the default hexadecimal value given. For example,
Hexadecimal Address 0x14, output_phase, has a hexadecimal
default value of 0x00. This means Bit 3 = 0, Bit 2 = 0, Bit 1 = 1,
and Bit 0 = 1 or 0011 in binary. This setting is the default output
clock or DCO phase adjust option. The default value adjusts the
DCO phase 90° relative to the nominal DCO edge and 180°
relative to the data edge. For more information on this function,
consult the
Open Locations
Locations marked as open are currently not supported for this
device. When required, these locations should be written with
0s. Writing to these locations is required only when part of an
address location is open (for example, Address 0x14). If the
entire address location is open (Address 0x13), then the address
location does not need to be written.
SCLK
SDIO
CSB
DON’T CARE
DON’T CARE
Interfacing to High Speed ADCs via SPI
t
S
R/W
t
DS
W1
W0
t
DH
A12
A11
t
HI
Figure 50. Serial Port Interface Timing Diagram
user manual.
A10
t
LO
A9
Rev. 0 | Page 22 of 40
t
CLK
A8
A7
Default Values
Coming out of reset, critical registers are loaded with default
values. The default values for the registers are shown in
Table 15.
Logic Levels
An explanation of two registers follows:
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•
SPI-Accessible Features
A list of features accessible via the SPI and a brief description of
what the user can do with these features follows. These features
are described in detail in the
SPI
•
•
•
•
•
•
•
user manual.
“Bit is set” is synonymous with “Bit is set to Logic 1” or
“Writing Logic 1 for the bit. ”
“Clear a bit” is synonymous with “Bit is set to Logic 0” or
“Writing Logic 0 for the bit. ”
Modes: Set either power-down or standby mode.
Clock: Access the DCS via the SPI.
Offset: Digitally adjust the converter offset.
Test I/O: Set test modes to have known data on output bits.
Output Mode: Setup outputs, vary the strength of the
output drivers.
Output Phase: Set the output clock polarity.
VREF: Set the reference voltage.
D5
D4
D3
Interfacing to High Speed ADCs via
D2
D1
D0
t
H
DON’T CARE
DON’T CARE