Digital BTSC Encoder
with Integrated ADC and DAC
AD1970
APPLICATIONS
Digital set top box
DVD player
FEATURES
Complete BTSC encoder
Pilot tone generator
Includes subcarrier modulation
Channel separation: 30 dB
Bandwidth up to 14 kHz
DVD recorder
GENERAL DESCRIPTION
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
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.
74 dB dynamic range
−72 dB THD + N
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.
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
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.
Dolby™ RF mode-compatible
48-pin LQFP plastic package
FUNCTIONAL BLOCK DIAGRAM
AD1970
ADC
DECIMATION
FILTER
ANALOG L/R
INPUTS
ADC
BTSC
ENCODER
CORE
3
DIGITAL AUDIO
INTERFACE
SYNC
STRIPPER
COMPOSITE
VIDEO
PLL
BTSC
ENCODED
OUTPUT
CONTROL
REGISTERS
4
2
I C I/O
2
I C PORT
DAC
ADC
GROUP
VOLUME
CONTROL
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
Fax: 781.461.3113
www.analog.com
© 2005 Analog Devices, Inc. All rights reserved.
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