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參數(shù)資料
| 型號： | IDT82V3280DQG8 |
| 廠商： | IDT, Integrated Device Technology Inc |
| 文件頁數(shù)： | 86/171頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC PLL WAN SE STRATUM 2 100-TQFP |
| 標(biāo)準(zhǔn)包裝： | 750 |
| 類型： | 時鐘/頻率發(fā)生器，多路復(fù)用器 |
| PLL： | 是 |
| 主要目的： | 以太網(wǎng)，SONET/SDH，Stratum |
| 輸入： | CMOS，LVDS，PECL |
| 輸出： | CMOS，LVDS，PECL |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 14:9 |
| 差分 - 輸入:輸出： | 是/是 |
| 頻率 - 最大： | 622.08MHz |
| 電源電壓： | 3 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 100-LQFP 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 100-TQFP-EP（14x14） |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | 82V3280DQG8 |
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IDT82V3280
WAN PLL
Functional Description
21
December 9, 2008
3.4
INPUT CLOCK PRE-DIVIDER
Each input clock is assigned an internal Pre-Divider. The Pre-Divider
is used to divide the clock frequency down to the DPLL required fre-
quency, which is no more than 38.88 MHz.
For IN1 and IN2, the DPLL required frequency is fixed to 8 kHz (i.e.,
the corresponding IN_FREQ[3:0] bits are ‘0000’). The 8 kHz clock is
extracted from the composite clock and the Pre-Divider is bypassed
automatically.
For IN3 ~ IN14, the DPLL required frequency is set by the corre-
sponding IN_FREQ[3:0] bits.
If the input clock is of 2 kHz, 4 kHz or 8 kHz, the Pre-Divider is
bypassed automatically and the corresponding IN_FREQ[3:0] bits
should be set to match the input frequency; the input clock can be
inverted, as determined by the IN_2K_4K_8K_INV bit.
Each Pre-Divider consists of a HF (High Frequency) Divider (only
available for IN5 and IN6), a DivN Divider and a Lock 8k Divider, as
shown in Figure 3.
The HF Divider, which is only available for IN5 and IN6, should be
used when the input clock is higher than (
>) 155.52 MHz. The input
clock can be divided by 4, 5 or can bypass the HF Divider, as deter-
mined by the IN5_DIV[1:0]/IN6_DIV[1:0] bits correspondingly.
Either the DivN Divider or the Lock 8k Divider can be used or both
can be bypassed, as determined by the DIRECT_DIV bit and the
LOCK_8K bit.
When the DivN Divider is used for INn (3
≤ n ≤ 14), the division factor
setting should observe the following order:
1. Select an input clock by the PRE_DIV_CH_VALUE[3:0] bits;
2. Write the lower eight bits of the division factor to the
PRE_DIVN_VALUE[7:0] bits;
3. Write the higher eight bits of the division factor to the
PRE_DIVN_VALUE[14:8] bits.
Once the division factor is set for the input clock selected by the
PRE_DIV_CH_VALUE[3:0] bits, it is valid until a different division factor
is set for the same input clock. The division factor is calculated as fol-
lows:
Division Factor = (the frequency of the clock input to the DivN
Divider ÷ the frequency of the DPLL required clock set by the
IN_FREQ[3:0] bits) - 1
The DivN Divider can only divide the input clock whose frequency is
lower than (
<) 155.52 MHz.
When the Lock 8k Divider is used, the input clock is divided down to
8 kHz automatically.
The Pre-Divider configuration and the division factor setting depend
on the input clock on one of the IN3 ~ IN14 pins and the DPLL required
clock. Here is an example:
The input clock on the IN6 pin is 622.08 MHz; the DPLL required
clock is 6.48 MHz by programming the IN_FREQ[3:0] bits of register IN6
to ‘0010’. Do the following step by step to divide the input clock:
1. Use the HF Divider to divide the clock down to 155.52 MHz:
622.08 ÷ 155.52 = 4, so set the IN6_DIV[1:0] bits to ‘01’;
2. Use the DivN Divider to divide the clock down to 6.48 MHz:
Set the PRE_DIV_CH_VALUE[3:0] bits to ‘0110’;
Set the DIRECT_DIV bit in Register IN6_CNFG to ‘1’ and the
LOCK_8K bit in Register IN6_CNFG to ‘0’;
155.52 ÷ 6.48 = 24; 24 - 1 = 23, so set the
PRE_DIVN_VALUE[14:0] bits to ‘10111’.
Figure 3. Pre-Divider for An Input Clock
Input Clock INn
(14>n>3)
DivN Divider
Lock 8k Divider
HF Divider
(for IN5 & IN6 only)
Pre-Divider
IN5_DIV[1:0] bits / IN6_DIV[1:0] bits
DIRECT_DIV bit
LOCK_8K bit
DPLL required clock
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IDT82V3280EQG | 功能描述:IC PLL WAN SE STRATUM 2 100TQFP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1,500 系列:- 類型:時鐘緩沖器/驅(qū)動器 PLL:是 主要目的:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 電源電壓:3.3V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:28-SSOP 包裝:帶卷 (TR) 其它名稱:93786AFT |
| IDT82V3280EQG8 | 制造商:Integrated Device Technology Inc 功能描述:IC PLL WAN SE STRATUM 2 100TQFP |
| IDT82V3280EQGBLANK | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:WAN PLL |
| IDT82V3280PF | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:WAN PLL |
| IDT82V3280PFBLANK | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:WAN PLL |
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