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any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
Absolute Maximum Ratings (Ta=25 °C)
• Supply voltage
• Operating temperature
–40 to +85
• Storage temperature
–65 to +150
• Allowable power dissipation
DIP16 (A1550P/A1551P/A1552P/A1553P) 900 mW
∗ These ICs are available only to the licensees of
Dolby Laboratories Licensing Corporation from
whom licensing and applications information may
∗ “Dolby” and the double D symbols are trade marks
of Dolby Laboratories Licensing Corporation.
The CXA1550/CXA1551/CXA1552/CXA1553 are
bipolar ICs providing two separate Dolby B type
noise reduction processors. The series is
composed of seven devices having four Dolby levels
and two types of package for various applications.
These devices feature very few external
components, which is achieved by monolithic filter
circuits using integrated thin film capacitors with high
• Pin replaceable with CXA1100 series
• Minimum number of external components
• NR ON/OFF/Double Speed, REC/PB switches
• Small package (16 pin SOP, 16 pin DIP)
• Low current consumption 5.6mA typ.
• Dual channel processors in one chip
• Double speed encode and decode functions are
Dolby B∗ type Noise Reduction System
16 pin SOP (Plastic)
16 pin DIP (Plastic)
CXA1550P, CXA1551M/P, CXA1552M/P, CXA1553M/P
Block Diagram10111213141516REC OUTLINE OUTREC/PBPB INREC INC122.2µC100.1µC82.2µC51µC21µR118kATT1SCDETATT3ATT2REC OUTLINE OUTON/OFF/×2PB INVCCREC INC90.1µC112.2µC72.