參數(shù)資料
型號(hào)： AD9959BCPZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 22/44頁(yè)
文件大?。?/td> 0K
描述： IC DDS QUAD 10BIT DAC 56LFCSP
產(chǎn)品培訓(xùn)模塊： Direct Digital Synthesis Tutorial Series (1 of 7): Introduction
Direct Digital Synthesizer Tutorial Series (7 of 7): DDS in Action
Direct Digital Synthesis Tutorial Series (3 of 7): Angle to Amplitude Converter
Direct Digital Synthesis Tutorial Series (6 of 7): SINC Envelope Correction
Direct Digital Synthesis Tutorial Series (4 of 7): Digital-to-Analog Converter
Direct Digital Synthesis Tutorial Series (2 of 7): The Accumulator
設(shè)計(jì)資源： Phase Coherent FSK Modulator (CN0186)
標(biāo)準(zhǔn)包裝： 1
分辨率（位）： 10 b
主 fclk： 500MHz
調(diào)節(jié)字寬（位）： 32 b
電源電壓： 1.71 V ~ 1.96 V
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 56-VFQFN 裸露焊盤(pán)，CSP
供應(yīng)商設(shè)備封裝： 56-LFCSP-VQ（8x8）
包裝： 托盤(pán)
產(chǎn)品目錄頁(yè)面： 552 (CN2011-ZH PDF)
AD9959
Rev. B | Page 29 of 44
SYNCHRONIZING MULTIPLE AD9959 DEVICES
The AD9959 allows easy synchronization of multiple AD9959
devices. At power-up, the phase of SYNC_CLK can be offset
between multiple devices. To correct for the offset and align the
SYNC_CLK edges, there are three methods (one automatic mode
and two manual modes) of synchronizing the SYNC_CLK edges.
These modes force the internal state machines of multiple
devices to a known state, which aligns the SYNC_CLK edges.
In addition, the user must send a coincident I/O_UPDATE to
multiple devices to maintain synchronization. Any mismatch in
REF_CLK phase between devices results in a corresponding
phase mismatch on the SYNC_CLK edges.
AUTOMATIC MODE SYNCHRONIZATION
In automatic mode, multiple part synchronization is achieved
by connecting the SYNC_OUT pin on the master device to the
SYNC_IN pins of the slave devices. Devices are configured as
master or slave through programming bits, accessible via the
serial port.
A configuration for synchronizing multiple AD9959 devices in
automatic mode is shown in the Application Circuits section. In
this configuration, the AD9510 provides coincident REF_CLK
and SYNC_OUT signals to all devices.
Operation
The first steps are to program the master and slave devices for
their respective roles and then write the auto sync enable bit
(FR2[7]) = 1. Enabling the master device is performed by writing
its multidevice sync master enable bit in Function Register 2
(FR2[6]) = 1. This causes the SYNC_OUT of the master device
to output a pulse that has a pulse width equal to one system
clock period and a frequency equal to one-fourth of the system
clock frequency. Enabling devices as slaves is performed by
writing FR2[6] = 0.
In automatic synchronizing mode, the slave devices sample
SYNC_OUT pulses from the master device on the SYNC_IN
of the slave devices, and a comparison of all state machines is
made by the autosynchronization circuitry. If the slave devices
state machines are not identical to the master, the slave devices
state machines are stalled for one system clock cycle. This proce-
dure synchronizes the slave devices within three SYNC_CLK
periods.
Delay Time Between SYNC_OUT and SYNC_IN
When the delay between SYNC_OUT and SYNC_IN exceeds
one system clock period, the system clock offset bits (FR2[1:0]) are
used to compensate. The default state of these bits is 00, which
implies that the SYNC_OUT of the master and the SYNC_IN of
the slave have a propagation delay of less than one system clock
period. If the propagation time is greater than one system clock
period, the time should be measured and the appropriate offset
programmed. Table 24 describes the delays required per system
clock offset value.
Table 24. System Clock Offset (Delay) Assignments
System Clock
Offset (FR2[1:0])
SYNC_OUT/SYNC_IN
Propagation Delay
00
0 ≤ delay ≤ 1
01
1 ≤ delay ≤ 2
10
2 ≤ delay ≤ 3
11
3 ≤ delay ≤ 4
Automatic Synchronization Status Bits
If a slave device falls out of sync, the sync status bit is set high.
The multidevice sync status bit (FR2[5]) can be read through
the serial port. It is automatically cleared when read.
The synchronization routine continues to operate regardless of
the state of FR2[5]. FR2[5] can be masked by writing Logic 1 to
the multidevice sync mask bit (FR2[4]). If FR2[5] is masked, it is
held low.
MANUAL SOFTWARE MODE SYNCHRONIZATION
Manual software mode is enabled by setting the manual software
sync bit (FR1[0]) to Logic 1 in a device. In this mode, the I/O
update that writes the manual software sync bit to Logic 0 stalls
the state machine of the clock generator for one system clock
cycle. Stalling the clock generation state machine by one cycle
changes the phase relationship of SYNC_CLK between devices
by one system clock period (90°).
Note that the user may have to repeat this process until the
devices have their SYNC_CLK signals in phase. The SYNC_IN
input can be left floating because it has an internal pull-up. The
SYNC_OUT pin is not used.
The synchronization is complete when the master and slave
devices have their SYNC_CLK signals in phase.
MANUAL HARDWARE MODE SYNCHRONIZATION
Manual hardware mode is enabled by setting the manual hardware
sync bit (FR1[1]) to Logic 1 in a device. In manual hardware
synchronization mode, the SYNC_CLK stalls by one system
clock cycle each time a rising edge is detected on the SYNC_IN
input. Stalling the SYNC_CLK state machine by one cycle changes
the phase relationship of SYNC_CLK between devices by one
system clock period (90°).
Note that the user may have to repeat the process until the
devices have their SYNC_CLK signals in phase. The SYNC_IN
input can be left floating because it has an internal pull-up. The
SYNC_OUT is not used.
The synchronization is complete when the master and slave
devices have their SYNC_CLK signals in phase.
相關(guān)PDF資料
PDF描述
VE-2WT-IY-F2 CONVERTER MOD DC/DC 6.5V 50W
VE-2WR-IY-F4 CONVERTER MOD DC/DC 7.5V 50W
VE-2WR-IY-F1 CONVERTER MOD DC/DC 7.5V 50W
VE-2WP-IY-F3 CONVERTER MOD DC/DC 13.8V 50W
VE-2WN-IY-F2 CONVERTER MOD DC/DC 18.5V 50W
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD9959BCPZ1 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:4-Channel, 500 MSPS DDS with 10-Bit DACs
AD9959BCPZ-REEL7 功能描述:IC DDS QUAD 10BIT DAC 56LFCSP RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 直接數(shù)字合成 (DDS) 系列:- 產(chǎn)品變化通告:Product Discontinuance 27/Oct/2011 標(biāo)準(zhǔn)包裝:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 調(diào)節(jié)字寬（位）:32 b 電源電壓:2.97 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR)
AD9959BCPZ-REEL71 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:4-Channel, 500 MSPS DDS with 10-Bit DACs
AD995PCBZ 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:1 GSPS Quadrature Digital Upconverter w/18-Bit IQ Data Path and 14-Bit DAC
AD9960BSTZ 功能描述:RFID應(yīng)答器 MxFE for RFID Reader Transceiver RoHS:否 制造商:Murata 存儲(chǔ)容量:512 bit 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體: 封裝:Reel
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*