Datasheet > AD71028JSTRL

AD71028JSTRL

更新时间： 2024-11-24 04:04:15

品牌	Logo	应用领域
亚德诺 - ADI		编码器
页数	文件大小	规格书
20页	435K
描述
Dual Digital BTSC Encoder with Integrated DAC

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AD71028JSTRL 数据手册

Dual Digital BTSC Encoder

with Integrated DAC

AD71028

PRODUCT OVERVIEW

FEATURES

2 complete independent BTSC encoders

Pilot tone generator

Includes subcarrier modulation

Typical 23 dB to 27 dB separation, 16 dB minimum

Signal bandwidth of 14 kHz

Phat-Stereo^TMalgorithm for stereo image enhancement

Dialog enhancement function for playing wide dynamic

range video sources over built-in TV speakers

Includes L-R dual-band compressor

SPI® port for control of modes and effects

Differential output for optimum performance

DAC performance: 92 dB dynamic range, –92 dB THD+N

Output level control for setting aural carrier deviation

Flexible serial data port with right-justified, left-justified,

I²S compatible, and DSP serial port modes

48-lead LQFP plastic package

The AD71028 dual digital BTSC encoder provides two complete

digital BTSC encoder channels, including the pilot-tone

generation and subcarrier mixing functions. Two built-in high

performance DACs are provided to output the BTSC baseband

composite signal. The output of the AD71028 can be connected

with minimal external circuitry to the input of a 4.5 MHz aural

FM modulator.

In addition to the BTSC encoders, the AD71028 also includes a

stereo image enhancement function, Phat Stereo, to increase the

sense of spaciousness available from closely spaced TV

loudspeakers. A dialog enhancement algorithm is also included

to solve the problem of playing wide dynamic range sources

over limited-performance TV speakers and amplifiers. An

extensive SPI port allows click-free parameter updates.

The AD71028 also includes ADI’s patented multibit Σ-∆ DAC

architecture. This architecture provides 92 dB SNR and THD+N

of –92 dB.

APPLICATIONS

Digital set-top box BTSC encoder

FUNCTIONAL BLOCK DIAGRAM

SERIAL

INPUT A

SERIAL

INPUT

BTSC

ENCODER

PLL DIVIDERS

CORE A

BTSC

ENCODED

OUTPUT A

CLOCK

DOUBLER

DAC

CLOCK

SIGNAL

GROUP

ANALOG

BIAS

CLOCK

DOUBLER

BTSC

ENCODER

CORE B

PLL DIVIDERS

SPI PORT

BTSC

ENCODED

OUTPUT B

DAC

SERIAL

INPUT

SERIAL

INPUT B

CONTROL REGISTERS

PARAMETER RAM

SPI I/O

GROUP

AD71028

Figure 1. Functional Block Diagram

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable.

However, no responsibility is assumed by Analog Devices for its use, nor for any

infringements of patents or other rights of third parties that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.326.8703

www.analog.com

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