The Cirrus Logic CS2500, CS2501 and CS2600 are system-clocking devices designed for audio applications where stable, low-jitter clock generation is required. They are intended for use in systems such as automotive audio, professional audio, digital audio systems, network audio, USB audio interfaces and embedded audio designs.
In audio systems, clock quality directly affects the performance of downstream audio converters, DSPs and digital audio interfaces. The CS2500, CS2501 and CS2600 generate stable low-jitter clocks from a timing reference, helping keep audio-data converters and digital audio systems synchronized.
The devices use a hybrid analog/digital PLL architecture, combining a delta-sigma fractional-N analog PLL with a digital frequency-locked loop. This architecture enables frequency synthesis and clock generation from a stable timing reference, while also supporting operation from noisy or low-frequency input clock sources. The CS2500 can generate low-jitter clocks from noisy input clock sources at frequencies as low as 50 Hz.
The CS2600 adds further audio-specific functionality. It can generate low-jitter clocks from noisy reference clocks at frequencies as low as 150 Hz, includes an internal oscillator option to reduce external component requirements, and supports BCLK and FSYNC outputs derived from the PLL output signal. It also supports automatic rate control, which detects the clock input frequency and configures the PLL ratio for the required output.
For networked audio systems, such as automotive AVB and A2B architectures, these timing devices can provide the high-frequency, low-jitter clock required by high-fidelity audio converters while remaining frequency-locked to a network timing reference. They can also maintain a stable local clock if the network reference is interrupted or not yet available.
CS2500
The CS2500 is a programmable system-clocking device for frequency synthesis and clock generation. It supports configuration via I2C and SPI and can operate from a single 1.8 V or 3.3 V supply. It is available in a commercial-grade 10-pin TSSOP package and also in an AEC-Q100 Grade 2 option for operation up to +105°C.
CS2501
The CS2501 is also a system-clocking device with a hybrid analog/digital PLL architecture. It is intended for clock generation from a stable timing reference and can generate low-jitter clocks from noisy clock references.
CS2600
The CS2600 is the more advanced member of the family. It supports both software control via I2C/SPI and hardware control using pull-up or pull-down resistors. It also includes OTP memory for default operating settings loaded at boot-up, and supports audio clock outputs such as BCLK and FSYNC.
The CS2500, CS2501 and CS2600 timing devices offer:
Stable low-jitter clock generation
Hybrid analog/digital PLL architecture
Frequency synthesis from a timing reference clock
Support for noisy or low-frequency reference clocks
Single 1.8 V or 3.3 V supply operation
I2C and SPI configuration options
Automotive-grade versions qualified to AEC-Q100 Grade 2
Suitable for automotive, professional and embedded audio systems
Additional CS2600 features include:
BCLK and FSYNC audio clock outputs
Automatic rate control
Hardware control mode
Internal oscillator option
OTP memory for boot-up configuration
Support for phase-aligned clock outputs
Automotive audio systems
Professional audio equipment
Networked audio systems
USB audio interfaces
Digital audio systems
Embedded audio platforms
Audio converter clocking
DSP and digital amplifier clocking
Cirrus Logic also provides development support for the clocking family, including the Hazelburn CDB-CLOCKING evaluation platform, which is used for evaluating clocking devices such as the CS2600.
Need a stable clocking solution for your audio design?
Contact TOP-electronics for technical information, availability and design support for the Cirrus Logic CS2500, CS2501 and CS2600 timing devices.
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