HT9015 Datasheet, PDF (1/23 Pages) Holtek Semiconductor Inc – RF Single Chip for Cordless Phone

Preliminary
HT9015
RF Single Chip for Cordless Phone
Features
· Operating voltage: 2.7V~6V
· Extremely low power consumption current
- _{ICC= 0mA (typ.) in battery-saving mode}
- _{ICC= 8.5mA (typ.) in standby mode}
- _{ICC= 13.5mA (typ.) for communication}
· Built-in IF decoder, compander and PLL
· IF decoder
- _{1st/2nd Mixers, RX VCO}
- _{RSSI quadrature detector, IF AMP}
- _{Noise detector}
General Description
The HT9015 is an RF single chip for cordless
phone systems. Internally these are three major
parts, a PLL, an IF decoder and a compander.
The PLL provides radio channel selection for
either the transmitter or receiver. Frequency
locking status of the selected channel can be
monitored by a control register.
The IF decoder provides two frequency down
converters that let high frequency signals pass
through a mixer and local oscillator to be low-
ered for frequency even base band signals. It
also provides an RSSI (receiver signal strength
indicator) function to detect the IF output sig-
· Compander
- _{Expander, Compressor, Limiter}
- _{Receive AMP, MIC AMP, PRE AMP}
· PLL
- _{RX PLL, TX PLL}
- _{Local oscillator}
- _{Data latch control}
- _{Unlock detector}
· Four threshold variable battery alarms
nal strength and built-in noise detector for S/N
quality.
The compander provides better S/N ratio for
audio signal processing.
The HT9015 has a wide-range applications in
FM/FSK, Transmitting/Receiving of VHF
bandwidth including cordless phone, narrow
band voice and data transceiver systems.
The most significant advantage of the HT9015
is in the reduction of many external compo-
nents making it well suited for cordless phone
baseset, handset radio section.
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April 10, 2000