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부품번호 LV2700V 기능
기능 Spread Spectrum Communications IC
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LV2700V 데이터시트, 핀배열, 회로
Ordering number : EN *5651
Bi-CMOS LSI
LV2700V
Spread Spectrum Communications IC
Preliminary
Overview
The LV2700V provides the reception and transmission
functions necessary for half-duplex communication in
spread-spectrum communications systems.
Features
• Frequency conversion is not required.
(direct signal processing at 236 MHz)
• Wide spread-spectrum bandwidth (20 MHz)
• Sanyo developed system for PN code synchronization
• Allows direct primary modulation (FSK and FM) by
data and analog signals. (Maximum data rate: 150 kbps)
• Low-voltage operation (2.7 to 5.5 V)
• Low power dissipation (36 mW in RX mode)
• Band limiting filter (LPF) for data transmission
[RX Block]
• Spectrum despreader
• Synchronization supplementation and protection
• 236-MHz PLL
• PN code generator (M sequence)
• M sequence code length (31 or 63 chips) and tap
switching
• FSK (FM) demodulator
• Lock detector
Package Dimensions
[LV2700V]
Functions
[TX Block]
• Spectrum spreader
• Crystal oscillator circuit
• PN code generator (M sequence)
• M sequence code length (31 or 63 chips) and tap
switching
• 9.83 MHz PLL
SANYO: SSOP30
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
Pd max
Topr
Tstg
Operating Conditions at Ta = 25°C
Parameter
Recommended supply voltage
Allowable voltage range
Symbol
VCC
VCCop
Conditions
Conditions
Ratings
6
150
–20 to +75
–40 to +125
Unit
V
mW
°C
°C
Ratings
3
2.7 to 5.5
Unit
V
V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
63097HA(OT) No. 5651-1/9




LV2700V pdf, 반도체, 판매, 대치품
LV2700V
Pin Functions
Pin No.
1
Pin
RFVCC
Pin voltage(V)
Pin function
RF block power supply
2 REXT
0.2
Connection for the external capacitor and resistor
used by the internal RF amplifier
3 RFIN
4 RFGND
1 RF input
RF block ground
5 ANTDUMP
Output for the DC voltage used under strong
1.2
reception conditions to prevent saturation of the
RF amplifier.
Voltage variability range: about 0.5 V
6 RXVCC
Reception block power supply
7 BIASIN
DC bias voltage for the demodulation signal
processing block (LPF, amplifier, limiter)
Equivalent circuit
8 RXOUT
Demodulated data output
(This is an open drain output.)
9 LOCK DET
Outputs a high level when PN code
synchronization is established.
(This is a CMOS-level output.)
10
CEXT
Same as
V7
Amplifier output for demodulated output.
The pin 8 output data is made valid by connecting
a capacitor between this pin and ground.
Continued on next page.
No. 5651-4/9

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LV2700V 전자부품, 판매, 대치품
LV2700V
Circuit Operation and Usage Notes
1. RF amplifier block
The LV2700V includes an on-chip RF amplifier that provides a gain of about 15 dB. An input sensitivity of about
–100 dBm can be acquired by adding an external 25-dB RF amplifier. Since IF frequency conversion is not used, a
costly IF filter is not required. While the frequencies used are selected to be values relatively infrequently used in the
weak field range (under 320 MHz), out of band components must be excluded using a bandpass filter after the
antenna to improve both the interference rejection characteristics and the input sensitivity.
2. 236-MHz VCO
• The external 236-MHz VCO operates as follows in transmission and reception modes
[TX mode]
The VCO is adjusted to 236 MHz by a PLL circuit based on the 9.8304 reference.
That is, the phases of the VCO output that is input to pin 28 and the signal created by dividing the 9.8304 MHz
reference oscillator output by 24 are compared and edge-type phase detector. The error signal is integrated by the pin
22 loop filter and fed back through pin 26 to the VCO control input.
[RX mode]
The spread spectrum RF signal input to pin 3 is amplified by 15 dB and a narrow band signal is recovered by a
despreader circuit. The PLL circuit is then used for FM detection. That is, the phases of that signal and the VCO
output from pin 28 are compared, and the error signal is integrated by the pin 25 loop filter and fed back through pin
26 to the VCO control input. An FM detected demodulated signal can be acquired from pin 25 at this time.
• Main characteristics
— For half-duplex communication, a VCO circuit using a SAW resonator is used for both transmission and reception.
Control sensitivity: 0.7 to 1.5 MHz/V
Frequency range: 236 MHz ±2 MHz
SAW resonator: We recommend the SAW resonators manufactured by Murata Mfg. Co., Ltd. (with a series
resonance frequency error of ±500 ppm).
See the VCO circuit on page 8 for the recommended circuit, which is a Colpitts oscillator circuit.
— For unidirectional communication, an LC circuit based VCO may be used for the transmission side.
— The reception PLL circuit lock time is between 2 and 10 ms when power is first applied and between 0.5 and 1.0
ms after a transition from no input to the input present state.
3. FSK (FM) modulation technique
Modulation frequency range: 200 Hz to 150 kHz
When a modulated signal is applied to pin 22, there are limitations on low band FSK (FM) modulation, since this is
equivalent to applying the modulation as a disturbance signal to the PLL circuit. If it is necessary to apply modulation
to even lower bands, the 9.8 MHz reference oscillator circuit should be modified to be a VCXO circuit.
[For data input]
Apply the input data to pin 17. The signal is band limited to 300-kHz and then voltage limited to 1 Vp-p and output
from pin 18. This signal is passed through a series RC circuit and connected to pin 22. The capacitor is a DC-cut
capacitor of about 1 µF. The resistor should be about 20 k, and is used for modulation adjustment.
[For analog signal input]
Do not use the internal 300-kHz low-pass filter and limiting amplifier, but rather apply the signal through the RC
circuit to pin 22 directly.
When the resistor is 20 k, the optimal signal input level will be about 0.3 Vp-p.
4. Notes on the FSK (FM) demodulated signal
[For data output]
Connect a capacitor of about 0.1 µF between pins 23 and 24, and another 1 µF capacitor between pin 10 and ground.
This will allow a CMOS-level data output signal to be acquired from pin 8.
[For analog output]
An analog signal can be acquired from pin 10. In this case, do not insert a capacitor between pin 10 and ground. The
cutoff frequency of the internal 150-kHz low-pass filter is set somewhat high for two reasons: to prevent PN code
leakage and to limit attenuation of high-speed data as much as possible. As a result, this filter is inadequate for
No. 5651-7/9

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부품번호상세설명 및 기능제조사
LV2700V

Spread Spectrum Communications IC

Sanyo Semicon Device
Sanyo Semicon Device

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