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参数资料
| 型号： | AD9609-20EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 19/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION AD9609 20MSPS |
| 设计资源： | AD9649/29/09 Schematics AD9649/29/09 Gerber Files |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 10 |
| 采样率（每秒）： | 20M |
| 数据接口： | 串行，SPI? |
| 输入范围： | 2 Vpp |
| 在以下条件下的电源（标准）： | 46.3mW @ 20MSPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD9609 |
| 已供物品： | 板 |
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AD9609
Rev. 0 | Page 26 of 32
HARDWARE INTERFACE
The pins described in Table 14 constitute the physical interface
between the programming device of the user and the serial port
of the AD9609. The SCLK pin and the CSB pin function as inputs
when using the SPI interface. The SDIO pin is bidirectional,
functioning as an input during write phases and as an output
during readback.
The SPI interface is flexible enough to be controlled by
either FPGAs or microcontrollers. One method for SPI
configuration is described in detail in the AN-812 Appli-
cation Note, Microcontroller-Based Serial Port Interface
(SPI) Boot Circuit.
The SPI port should not be active during periods when the full
dynamic performance of the converter is required. Because the
SCLK signal, the CSB signal, and the SDIO signal are typically
asynchronous to the ADC clock, noise from these signals can
degrade converter performance. If the on-board SPI bus is used for
other devices, it may be necessary to provide buffers between
this bus and the AD9609 to prevent these signals from transi-
tioning at the converter inputs during critical sampling periods.
SDIO/PDWN and SCLK/DFS serve a dual function when the
SPI interface is not being used. When the pins are strapped to
DRVDD or ground during device power-on, they are associated
with a specific function. The Digital Outputs section describes
the strappable functions supported on the AD9609.
CONFIGURATION WITHOUT THE SPI
In applications that do not interface to the SPI control registers,
the SDIO/PDWN pin and the SCLK/DFS pin serve as standalone
CMOS-compatible control pins. When the device is powered up, it
is assumed that the user intends to use the pins as static control
lines for the power-down and output data format feature control.
In this mode, connect the CSB chip select to DRVDD, which
disables the serial port interface.
Table 15. Mode Selection
Pin
External
Voltage
Configuration
SDIO/PDWN
DRVDD
Chip power-down mode
AGND (default)
Normal operation (default)
SCLK/DFS
DRVDD
Twos complement enabled
AGND (default)
Offset binary enabled
SPI ACCESSIBLE FEATURES
Table 16 provides a brief description of the general features that
are accessible via the SPI. These features are described in detail
in the AN-877 Application Note, Interfacing to High Speed ADCs
via SPI. The AD9609 part-specific features are described in
detail in Table 17.
Table 16. Features Accessible Using the SPI
Feature
Description
Modes
Allows the user to set either power-down mode
or standby mode
Clock
Allows the user to access the DCS via the SPI
Offset
Allows the user to digitally adjust the
converter offset
Test I/O
Allows the user to set test modes to have known
data on output bits
Output Mode
Allows the user to set up outputs
Output Phase
Allows the user to set the output clock polarity
Output Delay
Allows the user to vary the DCO delay
VREF
Allows the user to set the reference voltage
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