2000 Jan 18

2

Philips Semiconductors

Preliminary specification

Pager receiver

UAA3500HL

FEATURES

• Double frequency conversion, zero-IF receiver with:

– Configurable in all paging bands (130 to 930 MHz)

– Low noise amplifier featured with four step Automatic

Gain Control (AGC)

– Down-conversion mixers

– On-chip, zero-IF channel filter

– I/Q, non-demodulated outputs

– Highpass filters to remove DC offsets.

• External Voltage Controlled Oscillator (VCO):

– Both Local Oscillators (LOs) derived from the VCO.

APPLICATIONS

• Remote control terminals.

GENERAL DESCRIPTION

The UAA3500HL is a one-chip pager receiver complying

performs in accordance with specifications in the

−10 to +55 °C temperature range.

The UAA3500HL contains a front-end receiver, which can

be configured through external components for any

frequency band between 130 and 930 MHz. The back-end

receiver consists of the channel filter and limiters. An

external VCO ensures the Local Oscillator (LO) for the

front-end. Designed in an advanced BiCMOS process, it

combines high performance with low-power consumption

and a high degree of integration, thus reducing external

component costs and total radio size.

Its first advantage is to remove the expensive SAW filter

necessary in a superhet architecture, replacing it by an

integrated, elliptic channel filter that provides 70 dB

adjacent channel rejection. The receive front-end section

consists of a low-noise amplifier that drives mixers through

an external LC image rejection filter. The output drives the

I and Q second mixers, whose outputs are at zero

frequency. The receiver back-end section consists of

filters (channel filtering), limiters (limited output required)

and high-pass filters (DC block) to remove DC offsets.

Outputs are I and Q, undemodulated signals.

Its second advantage is to provide the two LO signals from

one VCO only, tuned by a PLL. An on-chip frequency

divider-by-2 and buffers provide the LO sources.

Its third advantage is to provide two voltage regulators,

allowing to obtain 1.0 and 1.8 V regulated voltages.

ORDERING INFORMATION

TYPE NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

UAA3500HL

LQFP48

plastic low profile quad flat package; 48 leads; body 7

× 7 × 1.4 mm

SOT313-2