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Analog Devices Semiconductor Electronic Components Datasheet

AD1970 Datasheet

Digital BTSC Encoder

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AD1970 pdf
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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.



Analog Devices Semiconductor Electronic Components Datasheet

AD1970 Datasheet

Digital BTSC Encoder

No Preview Available !

AD1970 pdf
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



Analog Devices Semiconductor Electronic Components Datasheet

AD1970 Datasheet

Digital BTSC Encoder

No Preview Available !

AD1970 pdf
SPECIFICATIONS
Test conditions, unless otherwise noted
Table 1.
Parameters
Supply Voltages (AVDD, DVDD)
Ambient Temperature
Input Signal
Input Sample Rate
Measurement Bandwidth
Word Width
Load Capacitance
Load Current
Input Voltage High
Input Voltage Low
Conditions
3.3
25
1 kHz, 0.8 VRMS analog, 0 dBFS digital
48
20 Hz to 14 kHz
24
50
±1
2.0
0.8
Table 2. Analog Input Performance
Parameter
Maximum Input Level
Output Level
Dynamic Range (20 Hz to 14 kHz, –60 dB Input) (Encoded Output, Left = Right)
THD + Noise (Encoded Output, Left = Right, 20 Hz to 14 kHz)
VIN = 0 dBV rms
Table 3. Digital Input Performance
Parameter
Resolution
Output Level
Dynamic Range (20 Hz to 14 kHz, –60 dB Input) (Encoded Output, Left = Right)
THD + Noise (Encoded Output, Left = Right, 20 Hz to 14 kHz)
VIN = 0 dBFS
Table 4. Video Input
Parameter
Input Signal Level
Input Impedance
Table 5. Crystal Oscillator
Parameter
Transconductance
AD1970
Unit
V
°C
Hz, V rms, dBFS
kHz
kHz
Bits
pF
mA
V
V
Min Typ
Max Unit
1.0 (2.8)
V rms (V p-p)
250 mV rms
68 74
dB
–72 –65 dB
Min Typ
24
250
81 87
–83
Max Unit
Bits
mV rms
dB
–74 dB
Min Typ
0.35 1.0
2
Max
Unit
VP-P
kΩ
Min Typ
7 10
Max Unit
13 mmhos
Rev. 0 | Page 3 of 20




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