Active splitters designed for STBs with multiple tuners

Warren, N.J.—ANADIGICS Inc. has launched three active splitters for use in CATV set-top boxes with multiple tuners: the APS3608, APS3611 and APS3623.

All three devices incorporate highly linear, low noise amplifiers to drive multiple output paths, each of which provides a very low distortion connection to either an analog video or a digital video tuner.

ANADIGICS' APS3608 is a three-way active splitter with differential inputs and outputs and integrated gain control. The device provides 5dB typical noise figure at 5.5dB gain, and the three output paths can be controlled individually, with each providing 29dB of gain control range. The APS3608 has a flat gain profile over its 50 to 1100MHz operating frequency band. The device delivers excellent second and third order distortion performance, with CTB/CSO of-70dBc (typ.), and cross modulation (XMOD) of -67 dBc (typ.).

The APS3611 is a two-way active splitter with single-ended inputs and outputs that operates to 870MHz, and has a special frequency/gain profile designed to compensate for in-band attenuation caused by MoCA line filters. It has a low noise figure of 5dB, a fixed gain of 3dB, and a current adjust pin for optimizing distortion performance. The intermodulation distortion performance of the device is similar to the APS3608, with a CTB of -74 dBc, CSO of -67 dBc, and XMOD of -66 dBc.

The highly linear, low noise APS3623 is a three-way active splitter with single-ended inputs and outputs. It is optimized for compatibility with MoCA bands over 1GHz, and supports both analog and digital channel line-ups. With a CTB of -77 dBc and a CSO of -65 dBc, the linearity/distortion performance of the device is best in class. Both the APS3611 and the APS3623 were designed for MoCA-enabled set-top boxes, but also support multiple-tuner TV, TV tuner card and broadband media center applications.

Pricing: In 5,000-unit quantities, the APS3608 is $3.54; APS3611, $2.02; APS3623, $2.29;
Availability: Now.
Datasheets: APS3608, APS3611 and APS3623.


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