Z87000

`Transceiver/Controller Chip Optimized for Implementation of 900 MHz Spread Spectrum Cordless Phone
Adaptive Frequency Hopping
Transmit Power Control
Error Control Signaling
Handset Power Management
Support of 32 kbps ADPCM Speech Coding for High Voice Quality
` DSP Core Acts as Phone Controller
Zilog-Provided Embedded Transceiver Software to Control Transceiver Operation and Base Station- Handset Communications Protocol User-Modifiable Software Governs Phone Features
`Transceiver Circuitry Provides Primary Cordless Phone Communications Functions
Digital Downconversion with Automatic Frequency Control (AFC) Loop
FSK Demodulator
FSK Modulator
Symbol Synchronizer
Time Division Duplex (TDD) Transmit and Receive Buffers
` On-Chip A/D and D/A to Support 10.7 MHz IF Interface
` Bus Interface to Z87010 ADPCM Processor
` Static CMOS for Low Power Consumption
` 3.0V to 3.6V, -20 to +70, Z87L00
   4.5V to 5.5V, -20to +70, Z87000
`16.384 MHz Base Clock

The Z87000/Z87L00 FHSS Cordless Telephone Transceiver/
Controllers are expressly designed to implement a
900 MHz frequency hopping spread spectrum cordless
telephone compliant with United States FCC regulations
for unlicensed operation. The Z87000 and Z87L00 are distinct
5V and 3.3V versions, respectively, of the device. For
the sake of brevity, all subsequent references to the Z87000 in this document also apply to the Z87L00, unless specifically noted.

The Z87000 supports a specific cordless phone system design that uses frequency hopping and digital modulation to provide extended range, high voice quality, and low system costs.The Z87000 uses a Zilog 16-bit fixed-point two's complement static CMOS Digital Signal Processor core as the phone and RF section controller. The Z87000's DSP core processor further supports control of the RF section's frequency synthesizer for frequency hopping and the generation of the control messages needed to coordinate incorporation of the phone's handset and base station.

Additional on-chip transceiver circuitry supports Frequency Shift Keying modulation/demodulation and multiplexing/ demultiplexing of the 32 kbps voice data and 4 kbps command data between handset and base station. The Z87000 provides thirty-two I/O pins, including four wakeup  inputs and two CPU interrupt inputs. These programmable I/O pins allow a variety of user-determined phone features and board layout configurations. Additionally, the pins may be used so that phone features and interfaces are supported by an optional microcontroller rather than by the Z87000's DSP core.

In combination with an RF section designed according to the system specifications, Zilog's Z87010/Z87L10 ADPCM Processor, a standard 8-bit PCM telephone CODEC and minimal additional phone circuity, the Z87000 and its embedded software provide a total system solution.