參數(shù)資料
型號: OL2300NHN
廠商: NXP SEMICONDUCTORS
元件分類: 通信及網(wǎng)絡(luò)
英文描述: Fractional-N PLL based transmitter
中文描述: SPECIALTY TELECOM CIRCUIT, PQCC16
封裝: 3 X 3 MM, 0.85 MM HEIGHT, LEAD FREE, PLASTIC, MO-220, SOT758-1, VQFN-16
文件頁數(shù): 10/46頁
文件大?。?/td> 951K
代理商: OL2300NHN
OL2300
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 2 — 28 October 2010
10 of 46
NXP Semiconductors
OL2300
Fractional-N PLL based transmitter
(2)
Table 5.
Variable
C
load1
C
load2
C
XTAL1
C
XTAL2
C
PCB(par)
The oscillator is constructed using an inverting gain stage between the two XTAL pins with
a clock buffer stage in series. The feedback resistor between XTAL1 and XTAL2 is used to
define the DC operating point to keep the amplifier working in linear region.
The gain stage G1 features an automatic amplitude regulation. Maximum gain is required
only during oscillator start-up where a short start-up time and also a high start-up margin
are needed. If the amplitude exceeds (V
DD
0.5) V the gain is reduced to keep the current
consumption as low as possible.
Load capacitance calculation parameters
Description
load capacitor at XTAL1
load capacitor at XTAL2
pin capacitor at XTAL1
pin capacitor at XTAL2
parasitic PCB capacitance
Fig 7.
Crystal oscillator implementation
C
load
+
C
load1
C
XTAL1
----------------------------------------
+
C
load2
C
XTAL2
----------------------------------------
+
---------------------------------------------------------------------------------------
C
PCB(par)
+
=
001aak385
pd
pd
ENXR
Rpu(int)
G
1
XTAL2
XTAL
CXTAL2
Cload2
Cload1
CXTAL1
XTAL1
300 k
Ω
G
2
V
DDA
VREG
pd
clk_ref
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