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AT48810
Features
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Designed for use with Atmel's AT48802 Spread-Spectrum Signal Processor FCC Part 15, Unlicensed Operation RF Despreading and Narrowband IF for Highest Jamming Margin 1 mW Narrowband Operation, or 1 and 50 mW Spread-Spectrum Operation
Description
The AT48810 RF module is intended for time domain duplex spread-spectrum communications under FCC Part 15, 902-928 MHz unlicensed operations. This module features RF despreading and narrowband IF for powerful interference rejection. Spreading is via direct sequence. The unit can also be operated in a narrow-band configuration (FCC limits power to 1 mW in narrow band) by restricting the DC voltage to the power amplifier so that the transmit power is less than 0 dBm per FCC regulations. The unit can also be run in slow half duplex or simplex mode.
900 MHz SpreadSpectrum RF Module Preliminary
Pin Diagram
15.36 MHz Clock Out Ground VCC Synthesizer Data Clock Input Synthesizer Data Input Synthesizer Data Latch Input Modulation Input No Connection PN Spreading Enable Input PN Input 1 3 5 7 9 11 13 15 17 19 2 4 6 8 10 12 14 16 18 20 Audio Out Ground RSSI Out T/R Switch LNA Gain Hi/Low VCC No Connection Transmit Power On/Off Input Power Amp VCC Input Power Amp VCC Input
Note:
1. Connector on module is Dupont/Berg part number 87814-610. Mating connector is 87409-110.
0625A
3-1
Block Diagram
TX PWR GAIN LNA ON/OFF fC = 83.16 MHz Bw = 30 kHz fC = 1.23 MHz RSSI IF AMP DISCRIMINATOR AUDIO
ANTENNA PORT
DOWN CONVERTER T/R SWITCH XTAL OSC 83.16 1.23 MHz HANDSET OR BASE
3
DATA
SYNTHESIZER
TCXO 15.36 MHz
902928 MHz
UPCONVERTER
SPREAD
TR SW
AMP fC = 915 MHz ON/OFF
CLOCK
TX PWR
ON/OFF OTHER CIRCUITS PA VCC VCC PN PN ENABLE
Note:
1. The module cannot legally be certified without an antenna; this is an FCC requirement.
TDD Rate
7.5 kHz max
Operating Frequencies
Table 1. Version "B" (1, 2, 3, 4, 5, 6, 7, 8) Channel 1 2 3 4
Note: 1. 2. 3. 4. 5.
N 1334 1350 1356 1363
End B First LO, MHz 825.7536 829.4400 833.1264 837.4272
TX, MHz 910.1424 913.8288 917.5152 921.8160
RX, MHz 908.9136 912.6000 916.2864 920.5872
Second LO = 84.3888 MHz Reference Divider = 25 Phase Detector = 614.4 kHz First IF = 83.160 MHz Second IF = 1.229 MHz
6. Synthesizer PLL Bandwidth = 80 kHz nominal 7. Frequency Accuracy = 3.5 ppm (including temperature 0 to 50C) 8. Switching Time = 2.2 ms nominal, Ch 1 to Ch 4
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AT48810
AT48810
Table 2. Version "H" (1, 2, 3, 4, 5, 6, 7, 8) Channel 1 2 3 4
Note: 1. 2. 3. 4. 5.
N 1346 1352 1358 1365
First LO, MHz 826.9842 830.6688 834.3552 838.6560
TX, MHz 908.9136 912.6000 916.2864 920.5872
RX, MHz 910.1424 913.8288 917.5152 921.8160
Second LO = 81.9312 MHz Reference Divider = 25 Phase Detector = 614.4 kHz First IF = 83.160 MHz Second IF = 1.229 MHz
6. Synthesizer PLL Bandwidth = 80 kHz nominal 7. Frequency Accuracy = 3.5 ppm (including temperature 0 to 50C) 8. Switching Time = 2.2 ms nominal, Ch 1 to Ch 4
Transmit Modulation Input
Type Bandwidth Sensitivity Distortion PM, inside the phase lock loop 200 Hz to 70 kHz, -3 dB 20 cycles/V nominal -30 dBC max. for 10 cycle peak deviation at 1 kHz rate
Spreading Input
Type Bandwidth Sensitivity PN Enable Input Carrier Suppression Code Leakage PN Input Load Resistance BPSK 30 MHz 2.5 VPP for BPSK +5V = spread, high Z = CW -15 dBc max. -30 dB max. (for baseband modulation signal of better quality) 1K nominal
Antenna Port
Zo VSWR T/R Switch 50 ohms nominal 2.5:1 max., 902-928 MHz Low = transmit, CMOS compatible. Isolation 35 dB nominal
3-3
Transmit Power
Power Output On/Off Control +17 dBm at VCC = 5.0 VDC, VPA = 4.0 VDC TX PWR input pin 16, CMOS compatible, low = power on RF power amp VCC is on a separate pin from the other circuits VCC.
Receive
Sensitivity IF Bandwidth Signal-to-Noise Post Detection Net Bandwidth RSSI Output -105 dBm max. at 12 dB SINAD (C-weighted) 30 kHz at -3 dB nominal 30 dB min. C-weighted at -80 dBm 15 kHz, limited by IF filter Log compressed. Slope 0.24 uA/dB nominal into a zero ohm load. Rout = 58K nominal. Bandwidth 15 kHz, limited by IF filter. Noise floor - 110 dBm equivalent input. T/R switch T gives 35 dB nominal, low = transmit. GAIN control gives 17 dB nominal in LNA low = high gain. (binary controls: on/off only, CMOS compatible.) Sensitivity 0.4 uA/kHz nominal into a zero ohm load. Rout = 58K nominal. This output must be lowpass filtered (-3 dB at 200 Hz, 6 dB/octave) to give net link frequency response which is flat. Out of Band Antenna filter is -6 dB at fo 32.5 MHz and approx. -30 dB at fo 100 MHz. A cellular phone with 1 watt power at a distance of 5 feet produces no noticeable SNR degradation in the receiver for the mating transmitter at a distance of 10 feet, running spread spectrum R13 code. In Band Processing gain depends on code length. The use of RF despreading assures that the high processing gain can be maximally effective by allowing narrow IF bandwidth thus significantly reducing IF jamming induced desensitization.
Attenuators
Audio Output
Interface Rejection
Clock Output
15.360 MHz buffered from TCXO, CMOS compatible, one standard load.
Data Port
SPI/3-wire, 3 lines. Synthesizer device is National Semiconductor LMX1501 or equal.
3-4
AT48810
AT48810
Power Supply
Voltage Current +4.5 VDC min., +5.5 VDC max. Transmit only 185 mA nominal TDD 50/50 130 mA nominal Receive only 85 mA nominal 1. TCXO, from VCC edge = 3 ms max. 2. Synthesizer, VCC stabilized, from data latch edge = 3 ms max. (1) +4.0 VDC full power, +0.6 VDC for Pout < 0 dBm
Turn-On Time for 1 ppm error from final frequency Power Amp
Note:
1. It is allowable to program the synthesizer before the TCXO is fully stabilized
Adjustments
There are no user adjustments. The three adjustments are discriminator frequency adjust, TCXO nominal frequency, and transmit upconverter filter tuning.
Environment
Temperature Humidity Vibration Shock 0 to 55C 10% to 90% non-condensing
Physical
(Dimensional Drawings) Antenna Port Options Weight Center, Left, Right
Ordering Information
Ordering Code AT48810-RB AT48810-RH AT48810-CB AT48810-CH AT48810-LB AT48810-LH Antenna Right Right Center Center Left Left Frequency Plan B H B H B H Second LO 84.3888 MHz 81.9312 MHz 84.3888 MHz 81.9312 MHz 84.3888 MHz 81.9312 MHz
3-5

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