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參數(shù)資料
| 型號(hào)： | LMX2353 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | PLLatinum⑩ Fractional N Single 2.5 GHz Frequency Synthesizer |
| 中文描述： | PLLatinum⑩小數(shù)分頻單2.5千兆赫頻率合成器 |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大?。?/td> | 210K |
| 代理商： | LMX2353 |
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2.0 Programming Description
(Continued)
2.2.4.2 Phase Detector Polarity
Depending upon VCO characteristics, the PD_POL (R_15) bit should be set accordingly:
When VCO characteristics are positive like (1), PD_POL should be set HIGH;
When VCO characteristics are negative like (2), PD_POL should be set LOW.
(PD_POL)
2.3 N REGISTER
If the ADDRESS[1:0] field is set to 1 1, data is transferred from the 24-bit shift register into the N register which sets the PLL’ s
19-bit N-counter, prescaler value, counter reset, and power-down bit. The 19-bit N counter consists of a 4-bit fractional numerator,
FRAC_CNTR[3:0], a 5-bit swallow counter, A_CNTR[4:0], and a 10-bit programmable counter, B_CNTR[9:0]. Serial data format
is show below. The divide ratio (NB_CNTR) must be
≥
3, and must be
≥
swallow counter +2; NB_CNTR
≥
(NA_CNTR +2).
Most Significant Bit
23
22
SHIFT REGISTER BIT LOCATION
14
13
12
11 10
Data Field
NB_CNTR[9:0]
N
_15
_14
_13
_12
_11
Least Significant Bit
3
2
Address Field
FRAC_CNTR[3:0]
N
_3
_2
_1
_0
21
20
19
18
17
16
15
9
8
7
6
5
4
1
0
CTL_WORD[2:0]
N
_21
_20
NA_CNTR[4:0]
N
_7
_6
1
1
N
N
_19
N
_18
N
_17
N
_16
N
N
N
N
N
_10
N
_9
N
_8
N
N
_5
N
_4
N
N
N
2.3.1 CTL_WORD
(N_19 -N_21)
N_21
CNT_RST
N_20
PWDN
N_19
PRESC_SEL
2.3.2 Control Word Truth Table
Bit
Location
Function
0
1
PRESC_SEL
N_19
Prescaler Modulus Select
16/17
(0.5 GHz to 1.2 GHz)
Powered Up
Normal
Operation
Asynchronous
Power Down
32/33
(1.2 GHz to 2.5 GHz)
Powered Down
PWDN
N_20
Power Down
CNT_RST
N_21
Counter Reset
Reset
PWDN_MODE
F2_19
Power Down Mode Select
Synchronous
Power Down
2.3.2.1 Counter Reset
The Counter Reset enable bit when activated allows the reset of both N and R counters. Upon removal of the reset bit, the N
counter resumes counting in “close” alignment with the R counter (the maximum error is one prescaler cycle).
(CNT_RST)
2.3.2.2 Power Down
Activation of the PLLPWDN bit results in the disabling of the N counter divider and de-biasing of the f
input (to a high impedance
state). The R counter functionality also becomes disabled when the power down bit is activated. The OSCin pin reverts to a high
impedance state as well during power down. Power down forces the charge pump and phase comparator logic to a TRI-STATE
condition. The MICROWIRE control register remains active and capable of loading and latching in data during all of the power
down modes.
(PWDN)
2.3.2.3 Prescaler Modulus Select
The PRESC_SEL bit is used to set the RF prescaler modulus value. The LMX2353 is capable of operating from 500 MHz to
1.2 GHz with the 16/17 prescaler, and 1.2 GHz to 2.5 GHz with the 32/33 prescaler selection.
(PRESC_SEL)
VCO CHARACTERISTICS
DS101124-4
www.national.com
9
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| LMX2353SLBX | 功能描述:IC FREQ SYNTH 2.5GHZ 16LAMCSP RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時(shí)鐘 輸出:時(shí)鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無(wú)/無(wú) 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| LMX2353TM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Fractional N Single 2.5 GHz Frequency Synthesizer |
| LMX2353TM/NOPB | 功能描述:IC FREQ SYNTH 2.5GHZ 16TSSOP RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時(shí)鐘 輸出:時(shí)鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無(wú)/無(wú) 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| LMX2353TMX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Fractional N Single 2.5 GHz Frequency Synthesizer |
| LMX2353TMX/NOPB | 功能描述:IC FREQ SYNTH 2.5GHZ 16-TSSOP RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時(shí)鐘 輸出:時(shí)鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無(wú)/無(wú) 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
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