GS1531

The GS1531 is a multi-standard serializer with an integrated cable driver. When used in conjunction with the GO1525 Voltage Controlled Oscillator, a transmit solution can be realized for HD-SDI, SD-SDI and DVB-ASI applications.

The GS1531 features an internal PLL, which can be configured for loop bandwidth as narrow as 100kHz.

Thus the GS1531 can tolerate substantive jitter on the input PCLK and still provide output jitter well within SMPTE specification. Connect the output clocks from Gennum's GS4911 clock generator directly to the GS1531's PCLK input and configure the GS1531's loop bandwidth accordingly.

In addition to serializing the input, the GS1531 performs NRZ-to-NRZI encoding and scrambling as per SMPTE 292M/259M-C when operating in SMPTE mode. When operating in DVB-ASI mode, the device will insert K28.5 sync characters and 8b/10b encode the data prior to serialization.

Parallel data inputs are provided for 10-bit multiplexed or 20-bit demultiplexed formats at both HD and SD signal rates. An appropriate parallel clock input signal is also required.

The integrated cable driver GS1531 features an output mute on loss of parallel clock, high impedance mode, adjustable signal swing, and automatic dual slew rate selection depending on HD/SD operational requirements.

The GS1531 also includes a range of data processing functions including automatic standards detection and EDH support. The GS1531 can also insert TRS signals,calculate and insert line numbers and CRC's, re-map illegal code words and insert SMPTE 352M payload identifier packets. All processing features are optional and may be enabled/disabled via external control pin(s) and/or host interface programming.