CXA3108Q ETC2 [List of Unclassifed Manufacturers], CXA3108Q Datasheet

CXA3108Q

Manufacturer Part Number

CXA3108Q

Description

A New Age of Unified High-Frequency Analog and Digital Circuits Digital Satellite Broadcast Tuner IC

Manufacturer

ETC2 [List of Unclassifed Manufacturers]

Datasheet

1.CXA3108Q.pdf (2 pages)

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A New Age of Unified High-Frequency Analog and Digital Circuits

Digital Satellite Broadcast Tuner IC

CXA3108Q

CXA3038N

Satellite broadcasting using digital modulation first

entered service in 1994 in the US, and similar service

will begin this year, first in Europe and then in Japan.

Thus digital satellite broadcasting is expanding

rapidly on a worldwide scale. Sony has now developed

a chip set for the tuners of digital satellite broadcast

receivers. This chip set, which is introduced here,

consists of the CXA3108Q, which takes full advantage

of Sony's high-speed bipolar process technology and

integrates an oscillator/mixer circuit and a PLL circuit

for channel selection on a single chip, and the

CXA3038N quadrature detector IC.

The CXA3108Q integrates on a single

chip two functions that were previously

implemented on separate ICs: the

L-band down converter functions

(oscillator and mixer), and channel

selection. The PLL control function

supports both the I

bus and allows an even wider range of

reference frequencies to be selected.

These products combine both

high-frequency/low-noise analog

circuits and high-speed digital

circuits in a single chip, and in-

corporate a wide range of tech-

niques for suppressing mutual

interference between these cir-

cuits. We are convinced that these

ICs will contribute to reduced

costs and significant miniaturiza-

tion in digital satellite broadcast

tuners.

On-Chip PLL Frequency

Synthesizer Circuit

C bus and the 3-wire

P42 high-frequency linear process (fT

= 30 GHz), and the use of a Sony's

unique differential Colpitts oscillator

circuit allows this device to provide a

stable oscillator signal with no parasitic

oscillation over the wide band of 1.3 to

2.7 GHz. As shown in figure 3, the

frequency conversion characteristics of

this device are extremely flat and

feature high gain and low noise

figure.

free operation of the carrier recovery

function, which is required for 480-

MHz band quadrature detection by

including an on-chip PLL circuit.

External control is not required, since

the PLL circuit includes the divide data

and it can replace the high-cost SAW

resonator. Furthermore, to provide for

cases where the carrier frequency needs

to be adjusted, the device includes an

A/D converter to allow the frequency

to be adjusted over a range consisting

of 4 50-kHz steps from the center fre-

quency of 479.5 MHz.

The adoption of the newly-developed

The CXA3038N provides adjustment-

Support for a 2.7-GHz

Oscillator Frequency

Adjustment-Free

Carrier Recovery

CXA3038N

CXA3108Q

* For I

Purchase of Sony's I

Patent Rights to use these components in an I

system conforms to the I

Adjustment-free carrier recovery provided by

an on-chip PLL circuit

Minimal IQ quadrature error and minimal

amplitude error

Supports an oscillator frequency of 2.7 GHz

High gain and low noise figure

On-chip channel selection PLL

(Supports both I

C bus

C components conveys a license under Philips I

The CXA3108Q provides two IF

output circuit systems and an external

input pin for the PLL circuit, and can

support applications such as single unit

tuners for both analog and digital satel-

lite broadcasts and tuners for both UHF

and VHF broadcasts. Since the

CXA3038N also includes an on-chip 32

frequency divider circuit for the local

oscillator signal, it can also support the

earlier carrier recovery technique, in

which a PLL circuit was included in the

QPSK demodulation IC used in a later

stage. The CXA3108Q and CXA3038N

have power consumption levels of 350

mW and 250 mW, respectively, and

achieve a significant power reduction

over most previous chip sets. This

makes these devices optimal for bit

stream output type tuner pack products

that implement, in a single unit, the

whole tuner up to the QPSK demodula-

tion and error correction circuit, which

requires consideration of the heat

generation problem.

C bus* and 3-wire bus systems)

C Standard Specifications as defined by Philips.

Support for a Wide Range of

Applications

C system, provided that the

Related parts for CXA3108Q

CXA3108Q Summary of contents

Page 1

... Sony has now developed a chip set for the tuners of digital satellite broadcast receivers. This chip set, which is introduced here, consists of the CXA3108Q, which takes full advantage of Sony's high-speed bipolar process technology and integrates an oscillator/mixer circuit and a PLL circuit for channel selection on a single chip, and the CXA3038N quadrature detector IC ...

Page 2

... Digital Satellite Broadcast Reception Set Top Box Block Diagram CXA3108Q 1st IF from LNB AGC amp. Mix. 1.4~2.7 Osc. GHz 30V Loop 1T379 1T379 Filter Figure 2 CXA3108Q and CXA3038N Block Diagram f =480MHz IF CG (conversion gain (noise figure) 10 1.0 1.5 Reception Frequency (GHz) Figure 3 CXA3108Q Frequency Conversion Characteristics Quadrature ...

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