CLM9528 is a dual-stage phase-locked loop (PLL) developed with great dedication by Chiplon Microelectronics. The first-stage PLL reduces the jitter of the system clock to achieve the regulation of the input reference voltage. The second-stage PLL provides a high-frequency clock, enabling lower integral jitter and lower bandwidth noise from the clock output driver. The external VCXO supplies the low-noise reference voltage required by PLL2 to meet stringent phase noise and jitter requirements, achieving acceptable performance. The tuning frequency range of the on-chip VCO is from 3.450 GHz to 4.025 GHz. The integrated SYSREF generator outputs single-shot, N-shot or continuous signals and synchronizes with the outputs of PLL1 and PLL2 to align the times of multiple devices.The CLM9528 generates six-channel outputs with the highest frequency of 1.25 GHz (outputs 0 to output 3, output 12 and output 13), as well as eight-channel outputs with a maximum frequency of up to 1 GHz. Each output can be configured to directly come from PLL1, PLL2 or the internal SYSREF generator. Each of 14 output channels contains a divider with digital phase coarse adjustment functionality, as well as an analog fine phase delay module, allowing all 14 outputs to have high flexibility in timing alignment. The CLM9528 can also be used as a flexible dual-channel input buffer to achieve the distribution of 14-channel device clock and/or SYSREF signals. At startup, the CLM9528 directly sends the VCXO signal to output 12 and output 13, serving as the startup ready clock.The product can directly pin to pin replace similar international products without the need to change the circuit board or system software, achieving complete compatibility and replacement. Chiplon Microelectronics has developed its own testing plan to ensure that the factory products meet or even exceed the original specifications, supporting industrial grade working temperatures (-40 ℃~85 ℃). Competitor product: AD9528BCPZ

14-channel output, configurable as HSTL or LVDS

Maximum output frequency

6-channel output up to 1.25 GHz

8-channel output up to 1 GHz

Depends on the frequency accuracy of the voltage-controlled crystal oscillator (VCXO) (start-up frequency accuracy: <±100 ppm)

Each output provides a dedicated 8-bit divider

Coarse delay: 63 steps, each step being half the output frequency of the RF VCO divider, unaffected by jitter

Fine delay: 15 steps, resolution of 31 ps

Typical output skew: 20 ps

Duty cycle correction for odd divider settings

Output 12 and Output 13, VCO output at power-on

Absolute output jitter: <160 fS (at 122.88 MHz)

12 kHz to 20 MHz integration range

Digital lock-in frequency detection

SPI and I2C compatible serial control ports

Dual PLL architecture

PLL1

Using an external VCXO to reset the reference input clock

Phase detector rate: up to 110 MHz

Redundant reference input

Automatic and manual reference switching modes

Recovery and non-recovery switching

Keep mode supports reference loss detection

The low-noise LVDS/HSTL output provided by the VCXO can be used for RF/IF frequency synthesizers

PLL2

Phase comparator rate: Up to 275 MHz

Integrated low-noise VCO

Package: LFCSP-72 (10x10)

High-performance wireless transceiver

LTE and multi-carrier GSM base stations

Wireless and broadband infrastructure

Medical instruments

Low jitter, low phase noise clock distribution

Automatic test equipment (ATE) and high-performance instruments