Description
Features
The QFC001 is a full featured Spread Spectrum Modem IC with interfaces for a companion RF Transceiver. This device provides a highly flexible foundation for frequency agile Direct Sequence Spread Spectrum communication applications. Incorporation of PSI's QFAST™ Spread Spectrum Modem Technique makes the QFC001 particularly well suited for implementing high speed burst data systems. The QFC001 is supplied in an 80 pin TQFP package

Applications
  • FCC Part 15.247 Spread Spectrum Devices
  • Wireless Data (WAN/LAN)
  • Cordless Telephony
  • Wireless Intercom Devices
  • Packetized Data Modems.
  • Implements PSI's QFAST™ Spread Spectrum Modem Technique.
  • Directly Interfaces to Transceiver I/Q ports.
  • Provides all drivers and registers to interface with SST-00X Series Transceiver.
  • Minimal External Support circuitry.
  • On Chip Reference Oscillator
  • Power Down Provisions with Sleep Timer Output.
  • All Clock Generation and Recovery is performed on chip (Half Duplex Synchronous Modem)
  • Selectable Modes permit a variety of data rates and chip-to-bit ratio options.
  • Programmable PN generator variables
  • Separate, Programmable Whitener Technique.
  • Low Power CMOS

Operating Conditions
Parameter
Min.
Typ.
Max.
Units
DC Operating Voltage (VDD)
4.5
5.0
5.5
Volt
DC Operating Current (IDD)
15
mA
Ambient Temperature (Ta)
-40
25
85
degrees C

QFC001 Block Diagram

ABSOLUTE MAXIMUM RATINGS
Parameter
Operation outside of these limits may cause permanent damage
DC Supply Voltage (VDD)-0.3 V to + 7.0 VDC
Input Pin Voltage (VIN) -0.3 V to VDD + 0.3 V
Input Pin Current (IIN) 10 mA at 25 C
Storage Temperature (TSTRG) -55 C to +150 C
Lead Temperature (TLEAD)300 C, 10 seconds Max.

Specifications (Ta = 25 C)
Parameter
Min.
Typ.
Max.
Units
Master Clock Frequency
24.576
45
MHz
Data Rate
Mode A
409.6
750
kBps
Mode B
204.8
375
kBps
Mode C
81.92
150
kBps
Mode D
8.192
15
kBps
Chip to Bit Ratio
Mode A
30
Mode B
60
Mode C
50
Mode D
100
Acquisition Time
PN Code
8
Chips
Data Clock
2.5
Bits
PN Generator Length
1
255
 chips
Data Whitener Generator Length
1
255
 Bits
Current Drain
15
mA


NOTES:

US Patent 5,559828

QFAST is a Registered Trademark of PROBE Science, Inc.

Technology Licensing and Design Support for custom applications is available.