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UAA3500 Datasheet(PDF) 2 Page - NXP Semiconductors |
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UAA3500 Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 16 page 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 • FLEXTM, ERMES and POCSAG pagers • Remote control terminals. GENERAL DESCRIPTION The UAA3500HL is a one-chip pager receiver complying with POCSAG, FLEXTM and ERMES standards. The IC 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 |
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