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参数资料
| 型号： | AD9649BCPZRL7-65 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/32页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT 65MSPS 32LFCSP |
| 标准包装： | 1,500 |
| 位数： | 14 |
| 采样率（每秒）： | 65M |
| 数据接口： | 串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 87.5mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 32-LFCSP-VQ |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 2 个单端，单极；1 个差分，单极 |
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AD9649
Rev. 0 | Page 25 of
32
HARDWARE INTERFACE
The pins described in Table 13 constitute the physical interface
between the programming device of the user and the serial port
of the AD9649. 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. For detailed information about one
method for SPI configuration, refer to the AN-812 Application
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 AD9649 to prevent these signals from transitioning
at the converter inputs during critical sampling periods.
The SDIO/PDWN and SCLK/DFS pins 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 AD9649.
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 14. 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 15 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 AD9649 part-specific features are described in detail
in Table 16.
Table 15. Features Accessible Using the SPI
Feature
Description
Modes
Allows the user to set either power-down mode or
standby mode
Offset Adjust
Allows the user to digitally adjust the converter
offset
Test Mode
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
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