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参数资料
| 型号： | AD9608BCPZ-105 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 25/40页 |
| 文件大小： | 0K |
| 描述： | IC ADC DUAL 10BIT 64-LFCSP |
| 标准包装： | 1 |
| 位数： | 10 |
| 采样率（每秒）： | 105M |
| 数据接口： | LVDS，并联，串行，SPI |
| 转换器数目： | 2 |
| 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： | 64-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 64-LFCSP-VQ（9x9） |
| 包装： | 托盘 |
| 输入数目和类型： | 4 个单端，2 个差分 |
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AD9608
Rev. 0 | Page 31 of 40
SERIAL PORT INTERFACE (SPI)
The AD9608 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 15). 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 15. Serial Port Interface Pins
Pin
Function
SCLK
Serial clock. The serial shift clock input, which is used to
synchronize serial interface reads and writes.
SDIO
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.
CSB
Chip select bar. An active low control that gates the read
and write cycles.
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 62
and Table 5.
Other modes involving the CSB are available. The CSB can be
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.
DON’T CARE
SDIO
SCLK
CSB
tS
tDH
tCLK
tDS
tH
R/W
W1
W0
A12
A11
A10
A9
A8
A7
D5
D4
D3
D2
D1
D0
tLOW
tHIGH
09
97
7-
0
46
Figure 62. Serial Port Interface Timing Diagram
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