UAA3535 View Datasheet(PDF) - Philips Electronics

Part Name

Description

View to exact match

UAA3535

Fully integrated DECT transceiver

Philips Electronics 

Philips Semiconductors

Low power GSM/DCS/PCS multi-band transceiver

Objective specification

UAA3535HL

FEATURES

• Multi-band application for GSM, DCS and PCS cellular

phone systems

• Low noise and wide dynamic range low IF receiver

• More than 35 dB on-chip image rejection in receive

mode

• More than 64 dB gain control range in receive mode

• Integrated channel filter

• Integrated TX low-pass filter

• High precision I/Q modulator

• Multi-band TX modulation loop architecture including

offset mixer and phase-frequency detector

• Dual PLL with on-chip fully integrated IF VCO

• Fully differential design minimizing crosstalk and

spurious signals

• Functional down to 2.4 V and up to 3.6 V

• 3-wire serial bus interface

• LQFP48 package.

APPLICATIONS

• GSM 900 MHz, DCS 1800 MHz and PCS 1900 MHz

hand-held transceivers.

GENERAL DESCRIPTION

The UAA3535HL is intended for Global Systems for

Mobile communication (GSM), Digital Cellular

communication Systems (DCS) and Personal

Communication Services (PCS). The circuit integrates the

receiver and most of the transmitter section of hand-held

transceivers for these applications.

The receiver consists of two sections. The first section is

the RF receiver front-end, which amplifies the GSM, DCS

or PCS aerial signal, then converts the chosen channel

down to a low Intermediate Frequency (IF) of 100 kHz,

and also provides more than 35 dB image suppression.

Some selectivity is provided at this stage by an on-chip

low-pass filter and channel selectivity is provided by a high

performance integrated band-pass filter.

The second section is the IF section, which further

amplifies the chosen channel and performs gain control to

adjust the output level to the desired value. The IF gain

can be varied over more than 64 dB gain range.

The transmitter also consists of two sections. The first is a

high precision I/Q modulator which converts the baseband

modulation up to the transmit IF. The second is a

modulation loop architecture which converts the signal

to RF.

The Local Oscillator (LO) signals are provided by an

on-chip Voltage Controlled Oscillator (VCO) for operation

of the IF section and are provided externally for operation

of the RF section. The frequencies of the RF and IF VCOs

are set by internal PLL circuits, which are programmable

via a 3-wire serial bus. Comparison frequencies are

200 kHz (100 kHz step programmability) and 13 MHz for

the RF and IF PLL respectively, and are derived from a

13 MHz reference signal which has to be supplied

externally. The quadrature-phase RF LO signals required

for I/Q mixers in reception are generated internally.

The quadrature LO signals required for operation of the

I/Q modulator are generated inside the IF VCO.

The circuit can be powered-up into one of three different

modes: RX, TX or SYN mode, depending on the logic

state of pins RXON, TXON and SYNON, respectively. It is

also possible to set the IC in one of these modes by

software, using the 3-wire bus serial programming.

In RX (TX) mode, all sections required for receive

(transmit) are turned on. The SYN mode is used to

power-up the synthesizers prior to the RX or TX mode.

In the SYN mode, some internal LO buffers are also

powered-up in such a way that VCO pulling is minimized

when switching on the receiver or the transmitter.

Additional band selection is done using the 3-wire bus

serial programming, allowing the required enabling of the

Low Noise Amplifiers (LNAs) and charge pumps current

programming.

ORDERING INFORMATION

TYPE

NUMBER

UAA3535HL

NAME

LQFP48

PACKAGE

DESCRIPTION

plastic low profile quad flat package; 48 leads; body 7 × 7 × 1.4 mm

VERSION

SOT313-2

2000 Feb 17

2

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