CS61880

Octal E1 Line Interface Unit

Overview

Power Supply (V)	Control Modes	Line Coders	Number of Channels	TBR-12 Compliant	Impedance Matching Line Driver	Arbitrary Waveform Option	Package
3.3	Host & H/W	AMI & HDB3	8				144 LQFP 160 BGA

Description

The CS61880 is a full-featured octal E1 short-haul line interface unit that supports 2.048 Mbps data transmission for both 75 Ω and 120 Ω applications. Each channel provides crystal-less jitter attenuation that complies with the most stringent standards. Each channel also provides internal AMI/HDB3 encoding/decoding. To support enhanced system diagnostics, channel zero can be configured for G.772 non-intrusive monitoring the receive or transmit paths for any of the seven channels.

The CS61880 makes use of ultra-low-power matched-impedance transmitters and receivers to reduce power beyond that achieved by traditional driver designs. By achieving a more precise line match, this technique also provides superior return loss characteristics. Additionally, the internal line matching circuitry reduces the external component count. All transmitters have controls for independent power down and High-Z.

Each receiver provides reliable data recovery with over 12 dB of cable attenuation. The receiver also incorporates loss-of-signal (LOS) detection that is compliant to the most recent specifications.

Features

• Internal AMI or HDB3 encoding/decoding
• LOS detection per ITU G.775, ETSI 300-233
• G.772 non-intrusive monitoring
• Crystal-less jitter attenuation
• Serial/parallel microprocessor control interfaces
• Transmitter short circuit current limiter (<50 mA)
• Tx drivers with fast High-Z and power down
• JTAG boundary scan compliant to IEEE 1149.1
• User-customized pulse shapes
• Low power
• No external component changes for 120 Ω/75 Ω operation
• Industry standard pin-out
• Package: 144-pin LQFP, 160-pin BGA; lead-free assembly

Diagram