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PDF OL2300 Data sheet ( Hoja de datos )
| Número de pieza | OL2300 | |
| Descripción | Fractional-N PLL based transmitter | |
| Fabricantes | NXP Semiconductors | |
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OL2300
Fractional-N PLL based transmitter
Rev. 2 — 28 October 2010
Product data sheet
1. General description
The OL2300 is a UHF ASK/FSK fractional-N transmitter with a fully integrated fractional-N
Phase-Locked Loop (PLL) frequency synthesizer and a power amplifier to drive an
external antenna.
The OL2300 is especially designed for use in the Industrial Scientific Medical (ISM)
frequency bands (315/434/868/915 MHz). Fine-tuning of the reference oscillator by
means of fractional-N synthesis allows the compensation of manufacturing tolerances of
the crystal. The device also includes an adjustable output power capability.
The OL2300 can be used for both ASK and FSK modulation with chip rates up to
112 kcps. Due to the high-level of integration, few external components are needed to
construct a complete transmitter.
2. Features and benefits
Fully integrated fractional-N PLL frequency synthesizer
Integrated VCO without external components
Independent Power-down modes for oscillator and PLL
Operating frequency: 315/434/869/915 MHz ISM/SRD bands
OOK/ASK/FSK modulation
Software programmable output power
Software programmable modulation index for ASK
Software programmable frequency deviation for FSK
Software programmable multi channel capability
Software programmable crystal trimming capability
Low power operation
Very low external component count
Low pin-count
Very small package
1 page  
NXP Semiconductors
OL2300
Fractional-N PLL based transmitter
6.1.2 Interface and control logic
6.1.2.1 Configurable 3-wire or 4-wire interface
The OL2300 can be configured via a simple Serial Peripheral Interface (SPI). The
interface itself can be configured for 3-wire or 4-wire mode. The 4-wire mode uses pin
TEST1 as Serial Data Output SDO when the SDIO is used as input (see Figure 4).
EN pin must be set to enable communication via the 3 or 4-wire serial interface. If the EN
pin is kept low for at least 216 XTAL clock pulses, the transmitter device will be reset, the
bit-counter implemented inside the SPI counting the already transferred bits shall be set to
zero, SCK and SDIO are disabled and the device will enter the Power-down mode (also
the crystal oscillator is switched off). If the 4-wire interface has been used, a reset would
also deactivate the SDO pin (set to 3-state; ENSDO is not influenced).
3-wire interface
(transparent mode: baud-rate generated by μC)
MICROCONTROLLER
EN
SCK
SDIO
OL2300
3-wire interface
(synchronized mode: baud-rate generated by Frantic)
MICROCONTROLLER
EN
SCK
SDIO
OL2300
4-wire interface
MICROCONTROLLER
CKOUT
EN
SCK
SDI
SDO
OL2300
CKOUT
001aak382
Fig 4. Peripheral connection diagram
After a transmit command the EN pin has an additional function: At the falling edge of the
EN pin the level of the SDIO pin is latched and directly connected to the modulator input.
In this case it is possible to intercept the RF data transmission without deactivating the PA
and to loop the last transmitted bit while the SDIO interface is used for SFR configuration.
Note that EN must not be low for more than 216 XTAL clock pulses otherwise the device
will be reset.
SCK pin is the clock input for the serial interface. Depending on the start-up condition of
SCK at the rising edge of EN (see Section 6.7.9) each rising/falling edge of SCK shifts
data into or gets data from the SPI register set. During RF data transmission the SCK is
don’t care (signal on SCK has no influence on interface).
OL2300
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 28 October 2010
© NXP B.V. 2010. All rights reserved.
5 of 46
5 Page 
NXP Semiconductors
OL2300
Fractional-N PLL based transmitter
EN
XTAL2
IDD
0 ts
t (s)
001aak386
Fig 8. Crystal oscillator start-up
To additionally reduce the total current consumption the power supply of the crystal
oscillator can be switched from VDDA to the regulated supply voltage VREG by setting the
control bit ENXR in the special function register TXCON.
Table 6.
ENXR
0
1
Oscillator supply switch (ENXR)
Selected XTAL oscillator power supply
VDDA, unregulated supply mode
VREG, regulated supply mode
If ENXR is set, the oscillator supply is automatically changed to a regulated supply when
the transmit-state is entered. The XTAL supply is switched back to the unregulated supply
when the transmit-state is exited.
In Power-down mode both gain stages are switched off and XTAL2 is defined by an
internal pull-up resistor Rpu(int).
Table 7.
Bit 7
PD
R/W
Address 0Eh; TXCON, transmitter control
Bit 6
Bit 5
Bit 4
Bit 3
PDCK
XOSL
FBSL
PAM1
R/W R/W R/W R/W
Bit 2
PAM0
R/W
Bit 1
ENXR
R/W
Bit 0
PLLEN
R/W
Drive level:
A typical calculation of the approximate power dissipated in a crystal is:
Pmax
=
ESRtyp
×
-(--2---π------f---×-----C----l--o--a---d----×----V----D----D----)--2-
2
Example:
10 MHz crystal, Cload ~ 6 pF, ESR ~ 20 Ω at VDD = 3 V: Pmax = 12.8 μW
(3)
6.4 Power amplifier control and ASK modulation
For control of the output power and the modulation characteristics some special function
register bits (ACON, PAM, CASC) are available.
OL2300
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 28 October 2010
© NXP B.V. 2010. All rights reserved.
11 of 46
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet OL2300.PDF ] | |
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