Low-power, temperature stable 32MHz oscillator

Overview

STAR5013 is a low-jitter oscillator suitable for audio applications such as hearing-aids, and consumer audio. By measuring the oscillator frequency in the factory and using a binary search algorithm to select the desired centre frequency, the frequency can be guaranteed to be within +/- 2% over a temperature range of -10C to +55C. The oscillator uses a differential ring oscillator structure so as to maximize supply noise rejection. A level-shifter with active feedback is used to translate the low swing differential voltage from the oscillator core into a rail-to-rail CMOS level voltage output. Active feedback is used to measure and correct the duty cycle of the CMOS level output to be 50% within +/- 2%. The oscillator operates from a 0.9V regulated supply (externally regulated) so maximize supply rejection from the battery. The 65nm oscillator IP has an area of 0.075mm2

Key Features

32MHz frequency accurate to within +/- 2%
Low-jitter performance
Better than -100dBc a-weighted noise when used to clock a class-D audio driver
30uA of current
Differential ring oscillator core structure
CMOS level logic output with active feedback to maintain 50% duty cycle within +/- 2%
Operates from a 0.9V regulated supply
-10C to +55C performance range
-10C to +70C functional range
Digitally programmable centre frequency
Analog testbus enables direct probing of key internal nodes suitable for DC test
0.075mm2 area
65nm TSMC process

Block Diagram

Applications

Hearing-Aids
Consumer audio
Audio Class-D clock source
Low-jitter highly integrated systems

Deliverables

.gds layout database
.lib liberty timing models
.lef layout exchange format files
Extensive documentation
Customer support/integration package
Design usage training
Schematics available
Secured online portal

Technical Specifications

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