Document
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. • 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
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)
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 Conditions Ratings 6 150 –20 to +75 –40 to +125 Unit V mW °C °C
Operating Conditions at Ta = 25°C
Parameter Recommended supply voltage Allowable voltage range Symbol VCC VCCop Conditions 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 Electrical Characteristics at Ta = 25°C, VCC = 3 V, fc = 236 MHz, fm = 10 kHz, Vm = 0.2 Vp-p
Parameter Symbol ICCOTX ICCORX VOTX VOTX WS TXVCC + VDD RFVCC + RXVCC + VDD TXDATAOUT, f = 10 kHz TXREOUT TXRFOUT Conditions Ratings min typ 8 12 max 11 16 Unit mA mA
Quiescent current [TX Block] Modulated signal voltage RF output voltage Spread bandwidth [RX Block] Input sensitivity High level Demodulated output 1 Demodulated output 1 Total harmonic distortion Signal-to-noise ratio [CMOS-Level Interface] Input high-level voltage Input low-level voltage Output high-level voltage Output low-level voltage Input high-level current Input low-level current Input amplitude Crystal oscillator frequency conditions Input capacitance Low level
0.2 –35 19.7
Vp-p dBm MHz
VSRX VORX1H VORX1L VORX2 THD RX S/N
RFIN RXOUT RXOUT Pin 10 output w/o CEXT Pin 10 output w/o CEXT Pin 10 output w/o CEXT 45 240 300 0.5 55 2.5
–75
dBm V
0.4
V mVrms
2
% dB
VIH VIL VO H VOL IIH IIL VIN XOSC CIN
Pins 11 to 15, 17 Pins 11 to 15, 17 Pins 8, 9 Pins 8, 9 Pins 11 to 15, 17 Pins 11 to 15, 17 VCOIN XIN, XOUT RFIN, XIN, VCOIN
2.1 0.6 2.5 0.4 5 5 –16 5 2.5 13
V V V V µA µA dBm MHz pF
No. 5651-2/9
Block Diagram LV2700V
Synchronization control
Strong field detector
No. 5651-3/9
LV2700V Pin Functions
Pin No. 1 Pin RFVCC Pin voltage(V) Pin function RF block power supply Equivalent circuit
2
REXT
0.2
Connection for the external capacitor and resistor used by the internal RF amplifier
3
RFIN
1
RF input
4
RFGND
RF block ground
5
ANTDUMP
1.2
Output for the DC voltage used under strong 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)
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
LV2700V
Continued from preceding page.
Pin No. Pin Pin voltage(V) Pin function Turns the optimal PN code synchronization control on or off. Control is turned on by a high level input. Equivalent circuit
11
CTRL
12
PNT1
Tap selection for the PN code (M sequence)
Tap selection for the PN code (M sequence). These pins select one of three code types. PNT1 0 13 PNT2 0 1 1 0 = Low 1 = High PNT2 0 1 0 1 PN code CODE1 CODE2 CODE3
14
PNL
PN code length selection High: 63 chips Low: 31 chips Send/receive mode selection. High: Transmission Low: Reception CMOS block power supply Transmission data input (CMOS levels). Do not apply analog signals to this pin.
15
TX/RX
16
VDD
17
TX DATAIN
1.7
18
TX DATAOUT
0.7 1Vp-p
Transmission data output. The output signal is band limited to 300 kHz and voltage limited to 1 Vp-p. CMOS block ground
19 20
DGND XIN 1/2VCC
Input for the 9.8304 MHz reference oscillator inverter. Output for the 9.8304 MHz reference oscillator inverter. Add a resistor of about 1 MΩ between XIN and XOUT.
21
XOUT
1/2VCC
A06924
22
TXLPF
1.5
Connection for the 9.