參數(shù)資料
型號(hào)： AD1970JSTZRL
廠商： ANALOG DEVICES INC
元件分類： 消費(fèi)家電
英文描述： Digital BTSC Encoder with Integrated ADC and DAC
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP48
封裝： LEAD FREE, PLASTIC, MS-026-BBC, LQFP-48
文件頁(yè)數(shù)： 1/20頁(yè)
文件大?。?/td> 278K
代理商： AD1970JSTZRL
Digital BTSC Encoder
with Integrated ADC and DAC
AD1970
FEATURES
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
2005 Analog Devices, Inc. All rights reserved.
www.analog.com
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
I
2
C 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
Dolby
RF mode-compatible
48-pin LQFP plastic package
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 I
2
C 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.
FUNCTIONAL BLOCK DIAGRAM
ANALOG L/R
INPUTS
I
2
C I/O
GROUP
I
2
C PORT
CONTROL
REGISTERS
ADC
VOLUME
CONTROL
BTSC
ENCODER
CORE
BTSC
ENCODED
OUTPUT
ANALOG
BIAS
3
DAC
DECIMATION
FILTER
0
PLL
SYNC
STRIPPER
ADC
ADC
4
DIGITAL AUDIO
INTERFACE
COMPOSITE
VIDEO
AD1970
Figure 1.
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