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Analog Devices Semiconductor Electronic Components Datasheet



AD1970

Digital BTSC Encoder


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FEATURES
Complete BTSC encoder
Pilot tone generator
Includes subcarrier modulation
Channel separation: 30 dB
Bandwidth up to 14 kHz
Stereo analog or digital input
Phat-Stereo™ algorithm 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
I2C port for control of modes, effects, and parameters
Analog input performance
74 dB dynamic range
−72 dB THD + N
Digital input performance
87 dB dynamic range
−83 dB THD + N
Integrated op amps for analog inputs and outputs
Single-ended output reduces external part count
Integrated PLL generates all clocks from composite video,
48 kHz sample clock, or high speed master clock
Sync stripper to recover video clock from composite
video signal
Output level control for setting aural carrier deviation
Macrovision-compliant
DolbyRF mode-compatible
48-pin LQFP plastic package
Digital BTSC Encoder
with Integrated ADC and DAC
AD1970
APPLICATIONS
Digital set top box
DVD player
DVD recorder
GENERAL DESCRIPTION
The AD1970 is a complete analog or digital-in, analog-out
BTSC encoder which includes pilot-tone generation and sub-
carrier mixing functions. The stereo ADC provides the means
for digitization of the analog baseband audio signal. A built-in
high performance DAC is provided to output the BTSC base-
band composite signal. The output of the AD1970 can be
connected with minimal external circuitry to the input of a
4.5 MHz aural FM modulator.
In addition to the digital BTSC encoder, the AD1970 includes a
stereo image enhancement function, Phat Stereo, to increase the
sense of spaciousness available from closely spaced TV
loudspeakers. A dialog enhancement algorithm solves the
problem of playing wide dynamic range sources over limited-
performance TV speakers and amplifiers. An I2C port allows
control of the AD1970’s registers and parameters.
The AD1970 utilizes ADI’s patented multibit Σ-Δ architecture to
provide BTSC performance of up to 87 dB dynamic range and a
THD+N of −83 dB.
The AD1970 includes patented BTSC stereo TV technology
licensed from THAT Corporation.
ANALOG L/R
INPUTS
DIGITAL AUDIO
INTERFACE
COMPOSITE
VIDEO
3
I2C I/O
GROUP
4
FUNCTIONAL BLOCK DIAGRAM
ADC
ADC
DECIMATION
FILTER
SYNC
STRIPPER
PLL
AD1970
BTSC
ENCODER
CORE
I2C PORT
CONTROL
REGISTERS
ADC
VOLUME
CONTROL
DAC
BTSC
ENCODED
OUTPUT
ANALOG
BIAS
Figure 1.
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
www.analog.com
Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.



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AD1970
TABLE OF CONTENTS
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 6
Package Characteristics (48-Lead LQFP).................................. 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Theory of Operation ........................................................................ 9
Signal Processing ............................................................................ 10
Background of BTSC ................................................................. 10
Performance Factors .................................................................. 10
Separation Alignment ................................................................ 11
Phase Linearity of the External Analog Filter......................... 11
Input Levels ................................................................................. 11
Clocking and PLL....................................................................... 11
Crystal Oscillator........................................................................ 11
General Purpose Input/Output (GPIO) Pins ......................... 11
REVISION HISTORY
4/05—Revision 0: Initial Version
Power-Up Sequence ................................................................... 11
Control Port .................................................................................... 12
I2C Port Overview ...................................................................... 12
I2C Address Decoding................................................................ 12
Input Level Control.................................................................... 13
Output Level Control................................................................. 13
I2C Read/Write Data Formats................................................... 14
Analog Input/Output ..................................................................... 16
ADC Input................................................................................... 16
DAC Output................................................................................ 16
Serial Data Port........................................................................... 16
Serial Data Modes ...................................................................... 16
Typical Applications Circuit.......................................................... 18
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 19
Rev. 0 | Page 2 of 20



Part Number AD1970
Description Digital BTSC Encoder
Maker Analog Devices - Analog Devices
Total Page 20 Pages
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