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參數(shù)資料
| 型號： | AD9520-5BCPZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 43/76頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CLOCK GEN EXT VCO 64-LFCSP |
| 設(shè)計資源： | Synchronizing Multiple AD9910 1 GSPS Direct Digital Synthesizers (CN0121) Phase Coherent FSK Modulator (CN0186) |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 時鐘發(fā)生器，扇出配送 |
| PLL： | 是 |
| 輸入： | CMOS，LVDS，LVPECL |
| 輸出： | CMOS，LVPECL |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 2:12，2:24 |
| 差分 - 輸入:輸出： | 是/是 |
| 頻率 - 最大： | 2.4GHz |
| 除法器/乘法器： | 是/無 |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 64-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 64-LFCSP-VQ（9x9） |
| 包裝： | 托盤 |
| 產(chǎn)品目錄頁面： | 776 (CN2011-ZH PDF) |
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AD9520-5
Data Sheet
Rev. A | Page 48 of 76
SPI SERIAL PORT OPERATION
Pin Descriptions
SCLK (serial clock) is the serial shift clock. This pin is an input.
SCLK is used to synchronize serial control port reads and writes.
Write data bits are registered on the rising edge of this clock,
and the read data bits transition on the falling edge of SCLK.
This pin is internally pulled down by a 30 k resistor to ground.
SDIO (serial data input/output) is a dual-purpose pin and acts
either as an input only (unidirectional mode) or as both an input
and an output (bidirectional mode). The AD9520 defaults to
the bidirectional I/O mode (Register 0x000[7] = 0b).
SDO (serial data out) is used only in the unidirectional I/O mode
(Register 0x000[7]) as a separate output pin for reading back data.
CS (chip select bar) is an active low control that gates the read
and write cycles. When CS is high, SDO and SDIO are in a high
impedance state. This pin is internally pulled up by a 30 k
resistor to VS.
Figure 50. Serial Control Port
SPI Mode Operation
In SPI mode, single or multiple byte transfers are supported, as
well as MSB first or LSB first transfer formats. The AD9520
serial control port can be configured for a single bidirectional
I/O pin (SDIO only) or for two unidirectional I/O pins (SDIO/
SDO). By default, the AD9520 is in bidirectional mode. Short
instruction mode (8-bit instructions) is not supported. Only
long (16-bit) instruction mode is supported. It is possible that
the serial activity on the SDIO/SDO pins may induce jitter on
the PLL while data is being transmitted.
A write or a read operation to the AD9520 is initiated by
pulling CS low.
The CS stalled high mode is supported in data transfers where
three or fewer bytes of data (plus instruction data) are transferred
(see Table 38). In this mode, the CS pin can temporarily return
high on any byte boundary, allowing time for the system controller
to process the next byte. CS can go high on byte boundaries only
and can go high during either part (instruction or data) of the
transfer.
During this period, the serial control port state machine enters
a wait state until all data is sent. If the system controller decides
to abort the transfer before all of the data is sent, the state machine
must be reset by either completing the remaining transfers or by
returning CS low for at least one complete SCLK cycle (but
fewer than eight SCLK cycles). Raising the CS pin on a nonbyte
boundary terminates the serial transfer and flushes the buffer.
In the streaming mode (see Table 38), any number of data bytes
can be transferred in a continuous stream. The register address
is automatically incremented or decremented (see the SPI
MSB/LSB First Transfers section). CS must be raised at the end
of the last byte to be transferred, thereby ending streaming mode.
Communication Cycle—Instruction Plus Data
There are two parts to a communication cycle with the AD9520.
The first part writes a 16-bit instruction word into the AD9520,
coincident with the first 16 SCLK rising edges. The instruction
word provides the AD9520 serial control port with information
regarding the data transfer, which is the second part of the
communication cycle. The instruction word defines whether
the upcoming data transfer is a read or a write, the number of
bytes in the data transfer, and the starting register address for
the first byte of the data transfer.
Write
If the instruction word is for a write operation, the second part
is the transfer of data into the serial control port buffer of the
AD9520. Data bits are registered on the rising edge of SCLK.
The length of the transfer (one, two, or three bytes or streaming
mode) is indicated by two bits (W1:W0) in the instruction byte.
When the transfer is one, two, or three bytes, but not
streaming, CS can be raised after each sequence of eight bits to
stall the bus (except after the last byte, where it ends the cycle).
When the bus is stalled, the serial transfer resumes when CS is
lowered. Raising the CS pin on a nonbyte boundary resets the
serial control port. During a write, streaming mode does not
skip over reserved or blank registers, and the user can write
0x00 to the reserved register addresses.
Because data is written into a serial control port buffer area, not
directly into the actual control registers of the AD9520, an
additional operation is needed to transfer the serial control port
buffer contents to the actual control registers of the AD9520,
thereby causing them to become active. The update registers
operation consists of setting Register 0x232[0] = 1b (this bit is
self-clearing). Any number of bytes of data can be changed
before executing an update registers. The update registers
simultaneously actuates all register changes that have been
written to the buffer since any previous update.
Read
The AD9520 supports only the long instruction mode. If the
instruction word is for a read operation, the next N × 8 SCLK
cycles clock out the data from the address specified in the
instruction word, where N is 1 to 3 as determined by Bits[W1:W0].
If N = 4, the read operation is in streaming mode, continuing
until CS is raised. Streaming mode does not skip over reserved
or blank registers. The readback data is valid on the falling
edge of SCLK.
AD9520
SERIAL
CONTROL
PORT
SCLK/SCL
16
SDO
18
SDIO/SDA
17
CS
15
07239-
036
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9520-5BCPZ-REEL7 | 功能描述:IC CLOCK GEN EXT VCO 64LFCSP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- 類型:PLL 時鐘發(fā)生器 PLL:帶旁路 輸入:LVCMOS，LVPECL 輸出:LVCMOS 電路數(shù):1 比率 - 輸入:輸出:2:11 差分 - 輸入:輸出:是/無 頻率 - 最大:240MHz 除法器/乘法器:是/無 電源電壓:3.135 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:32-LQFP 供應(yīng)商設(shè)備封裝:32-TQFP（7x7） 包裝:帶卷 (TR) |
| AD9521JH | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Log/Antilog Amplifier |
| AD9521KH | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Log/Antilog Amplifier |
| AD9521SE | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Log/Antilog Amplifier |
| AD9521SH | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Log/Antilog Amplifier |
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