參數(shù)資料
型號(hào)： LMX2355SLB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： XO, clock
英文描述： PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer
中文描述： PLL FREQUENCY SYNTHESIZER, 2500 MHz, QCC24
封裝： CSP-24
文件頁(yè)數(shù)： 12/23頁(yè)
文件大?。?/td> 403K
代理商： LMX2355SLB
Functional Description
(Continued)
1.8 Fo/LD MULTIFUNCTION OUTPUT
The Fo/LD output pin can deliver several internal functions
including analog/digital lock detects, and counter outputs.
See programming description 4.1.5 for more details.
1.8.1 Lock Detect
A digital filtered lock detect function is included with each
phase detector through an internal digital filter to produce a
logic level output available on the Fo/LD output pin if se-
lected. The lock detect output is high when the error between
the phase detector inputs is less than 15 ns for 5 consecutive
comparison cycles. The lock detect output is low when the
error between the phase detector outputs is more than 30 ns
for one comparison cycle. An analog lock detect signal is
also selectable. The lock detect output is always low when
tions 4.1.5, 5.6–5.8 for more details.
1.9 POWER CONTROL
Each PLL is individually power controlled by device enable
pins or MICROWIRE power down bits. The enable pins
override the power down bits
except for the V2_EN bit
. The
2.0 Major Differences between the LMX2354 and the LMX2350/52
RF_EN pin controls the RF PLL; IF_EN pin controls the IF
PLL. When both pins are high, the power down bits deter-
mine the state of power control (see programming descrip-
tion 5.2.1.2).Activation of any PLL power down mode results
in the disabling of the respective N counter and de-biasing of
its respective fin input (to a high impedance state). The R
counter functionality also becomes disabled when the power
down bit is activated. The reference oscillator block powers
down and the OSC
pin reverts to a high impedance state
when both RF and IF enable pins or power down bit’s are
asserted, unless the V2_EN bit (RF_R[22]) is high Power
down forces the respective charge pump and phase com-
parator logic to a TRI-STATE condition. A power down
counter reset function resets both N and R counters. Upon
powering up the N counter resumes counting in “close”
alignment with the R counter (The maximum error is one
prescaler cycle). The MICROWIRE control register remains
active and capable of loading and latching in data during all
of the power down modes.
LMX2350/52
LMX2354
OSC
IF
Low modulus prescale (Note 7)
Supports resonator mode.
5-bit A counter, so if 16/17 prescale, bit-5 is
the unused place holder.
LMX2350—32/33 or 16/17
LMX2352—16/17 or 8/9
Standard. Fractional Compensation cannot
be turned off.
Does not support resonator mode.
4-bit A/B counters, so if 8/9/12/13, bit-4 is
the unused place holder.
LMX2354—16/17/20/21 or 8/9/12/13
RF Prescaler
Fractional Engine
Similar structure to the LMX2350/52, but with
some modifications for improved phase noise
and spurs. Fractional Compensation can be
turned off.
Note 7:
If the LMX2354 is replacing a LMX2350/52 in a design, and you are using the lower modulus prescale value (16/17 on the LMX2350 changes to 8/9/12/13
on the LMX2354), the unused prescaler bit of the LMX2350/52 needs to shift down one bit from N
<
9
>
to N
<
8
>
.
L
www.national.com
12
相關(guān)PDF資料
PDF描述
LMX2430 PLLatinum Dual High Frequency Synthesizer for RF Personal Communications
LMX2433TM PLLatinum Dual High Frequency Synthesizer for RF Personal Communications
LMX2433TMX PLLatinum Dual High Frequency Synthesizer for RF Personal Communications
LMX2434 PLLatinum Dual High Frequency Synthesizer for RF Personal Communications
LMX2434TM PLLatinum Dual High Frequency Synthesizer for RF Personal Communications
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMX2355TM 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer
LMX2360 WAF 制造商:Texas Instruments 功能描述:
LMX2360TMX 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述:
LMX2364 制造商:NSC 制造商全稱:National Semiconductor 功能描述:2.6 GHz PLLatinum Fractional RF Frequency Synthesizer with 850 MHz Integer IF Frequency Synthesizer
LMX2364EVAL 功能描述:BOARD EVALUATION LMX2364 RoHS:否 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 過(guò)時(shí)/停產(chǎn)零件編號(hào) 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP
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

*
*
*