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부품번호 OL2300 기능
기능 Fractional-N PLL based transmitter
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OL2300 데이터시트, 핀배열, 회로
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




OL2300 pdf, 반도체, 판매, 대치품
NXP Semiconductors
OL2300
Fractional-N PLL based transmitter
6. Functional description
6.1 Functional blocks overview
6.1.1 Power management, voltage regulator
The supply voltage source is connected between pin VDD and the pins VSS, VSSA and
VSS(PA).
An integrated low-dropout voltage regulator is used to supply the PLL and the PA-driver
with a reduced, regulated voltage. This helps keep the current consumption and the
supply voltage dependencies of the PLL as low as possible. The output of this regulator is
pin VREG which must be connected to an external blocking capacitor in order to
guarantee stability of the regulator. A recommended set-up is shown in Figure 23.
Two different regulator modes are available. For a detailed description see Section 6.4.6.
Pin VDDA is the positive supply voltage of the analog part of the PLL and pin VDDD(PA) is
the positive digital supply of the PLL prescaler and the PA-driver stage. Both pins should
be connected to pin VREG.
VDD
01
PLLEN
VREG
VDDA
VDDD(PA)
ENXR
TXON
AND
0
1
CRYSTAL
OSCILLATOR
REGULATOR ENRAD
0
Ref
1
VDDVCO
VREF
01
TXON
10
CASC
fracN-PLL
/64...71
PFD CP LPF VCO
RF-POWER
AMPLIFIER
BIAS
PAOUT
VSS(PA)
VSSA
VSS
Fig 3. Power management
001aak381
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.
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OL2300 전자부품, 판매, 대치품
NXP Semiconductors
OL2300
Fractional-N PLL based transmitter
The power amplifier output (pin PAOUT) requires an external DC path to pin VDD,
established by the antenna loop or a dedicated bias coil. A dedicated ground pin (VSS(PA))
is provided to improve the RF properties of the circuitry and must be connected to pin VSS.
Best efficiency is achieved when the output voltage swing at pin PAOUT yields one volt
less than two times the supply voltage:
VPAOUT (p-p) = (2VDDA 1) V
(1)
Three special-function-registers ACON0, ACON1 and ACON2 are available to control the
output power of the 4 binary weighted output stages.
The Power amplifier also features three regulated and one unregulated (high power)
output power modes, as selected by the control bits PAM1 and PAM0 located in the
TXCON register. In regulated mode the input drive level of the amplifier is derived from an
internal reference voltage and so the output power is stabilized against supply voltage and
temperature variations over a wide range.
6.2 Transmitter operating modes
6.2.1 Power-down mode
If the EN pin is kept low for at least 216 XTAL clock pulses (~5 ms at a 13.08 MHz crystal
frequency), the transmitter (PLL, Power amplifier and crystal oscillator) will be reset, the
bitcounter inside the SPI counting the already transferred bits is set to zero, SCK and
SDIO are disabled (also SDO, if used) and the device will enter the power-down mode. In
this state the TXCON bit PLLEN is cleared. The total current consumption is almost zero.
Another possibility to enter the Power-down mode is to set the PD bit in the TXCON
register.
When the Power-down mode is left (by rising edge of EN) the PD bit is cleared.
6.2.2 XTAL active mode
With the rising edge of EN the Power-down mode is left and the crystal oscillator is
activated. The XTAL clock will be stable after tset. The SPI is activated, so the SFRs can
be programmed. The XTAL Active mode can be left by either activating the PLL (set
PLLEN in TXCON) or by entering the Power-down mode.
6.2.3 PLL active mode
If the XTAL active mode is active and the crystal oscillator is settled, the PLL can be
switched on (after tset). Setting the bit PLLEN in the register TXCON directly powers on
the PLL. The VCO output frequency will be stable after tACQ. This mode stays active as
long as EN is kept 1 or as long as EN is kept 0 for a period shorter than 216 XTAL clock
pulses. If EN is kept 0 for a longer period or the PD bit in TXCON is set, the device returns
to the Power-down mode. By resetting the PLLEN bit in TXCON the PLL is turned off and
XTAL active mode is entered again. Another possibility to exit the PLL active mode is to
send a dedicated SPI command (transmit command).
6.2.4 Transmitter Active mode
The Transmitter Active mode can only be entered upon an SPI command, which is only
possible if the PLLEN bit is set (with a previous SPI command). Dependent on the
configuration coded into the transmit command, the Transmitter Active mode can be
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.
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부품번호상세설명 및 기능제조사
OL2300

Fractional-N PLL based transmitter

NXP Semiconductors
NXP Semiconductors

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