- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄1978 > ACS8947T (Semtech)IC JITTER ATT MULT PLL 48-QFN PDF資料下載
參數(shù)資料
| 型號(hào)： | ACS8947T |
| 廠商： | Semtech |
| 文件頁(yè)數(shù)： | 3/30頁(yè) |
| 文件大小： | 0K |
| 描述： | IC JITTER ATT MULT PLL 48-QFN |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 時(shí)鐘/頻率發(fā)生器，多路復(fù)用器 |
| PLL： | 是 |
| 主要目的： | 3G，以太網(wǎng)，PCI，SONET/SDH，無(wú)線系統(tǒng) |
| 輸入： | LVPECL |
| 輸出： | CML，LVPECL |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 2:4 |
| 差分 - 輸入:輸出： | 是/是 |
| 頻率 - 最大： | 625MHz |
| 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： | 48-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 48-QFN（7x7） |
| 包裝： | 托盤 |
第1頁(yè)第2頁(yè)當(dāng)前第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)
ACS8947T JAM PLL
ADVANCED COMMS & SENSING
FINAL
DATASHEET
Revision 1.00/September 2007 Semtech Corp.
Page 11
www.semtech.com
Phase and Frequency Detector
The internal phase and frequency detector is designed to
operate across the full input frequency range of 580 kHz
to 180 MHz and includes the ALARMC_CO3 activity alarm.
Charge Pumps and External Low-Pass Filter
A differential charge pump is used to drive the external
loop filter via pins VCN and VCP. For linear operation of
the PLL, the differential voltage range is limited to ±1.2 V
centered around a typical common mode voltage of
1.25 V.
To maintain sensible external component values, the
magnitude of the charge pump current (IC) is dependent
on the OSC/8 divider ratio as defined in Table 6.
The closed loop PLL bandwidth is set by two identical sets
of passive RC components that connect to the differential
charge pump outputs pins VCN and VCP. Figure 5 shows
the recommended configuration of the second order loop
differential filter.
Figure 5 Configuration of Second Order Loop Filter
Refer to PLL Configuration for details on how to calculate
the loop filter component values for a given closed loop
bandwidth and phase margin. Automatic calculation is
available in the the ACS8947T evaluation software GUI.
Voltage Controlled Oscillator
The internal VCO operates across a frequency range of
2.35 GHz to 2.9 GHz. The VCO frequency is divided down
to the selected output rate, giving a precise 50/50
balanced mark/space ratio for the output.
Output Multiplexer and Divider
A 5-bit tapped, differential CML divider tree is used in
conjunction with the odd divider to generate the required
output frequencies. The divider ratios are set according to
the frequency list defined by the external configuration
wiring and cannot be modified once the device is locked.
The device automatically allocates the frequency list to
outputs as part of the PLL configuration sequence.
Outputs
Four programmable LVPECL/CML differential outputs are
provided via signal pairs OUT[4:1]N/P (pins 11/12, 8/9,
5/6 and 2/3). Interfacing to LVDS is also possible using
suitable passive components (see Input and Output
Interface Terminations). The frequency assigned to each
output is programable between 1.23 MHz and 625 MHz
and, during device reset, is set by the frequency map
defined by the configuration sequence. Although the
theoretical maximum output frequency of the PLL is
725 MHz, the output ports are only guaranteed to meet
VOH/VOL to a maximum of 625 MHz.
Each differential output has a dedicated power supply pin
that should be connected to VDD if the output is required
to be active. If an output port is not required, connect the
dedicated power pin to ground to disable the differential
output.
Table 6 Relationship of IC and OSC/8 Divider Ratio
IC (
μA)
OSC/8 Divide By
10
1 -> 2
40
3 -> 8
160
9 -> 24
210
25 -> 512
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD10200BZ | IC ADC DUAL 12BIT 68-CLCC |
| AD10242BZ | IC ADC DUAL 12BIT 68-CLCC |
| AD10465BZ | IC ADC DUAL 14BIT 68-CLCC |
| AD13280AZ | IC ADC 12BIT 68CLCC |
| AD1377KD | IC ADC SNGL 16BIT 32-CDIP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ACS9010 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Optoelectronic |
| ACS9510/50EVB | 制造商:Semtech Corporation 功能描述: |
| ACS9510EVB | 功能描述:EVALUATION BOARD FOR ACS9510 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:ToPSync™ 標(biāo)準(zhǔn)包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
| ACS9510T | 制造商:Semtech Corporation 功能描述: |
| ACS9520PB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:ADVANCED COMMS PRODUCT GROUP |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。