ZL88801LDF1
ZL88801LDF1 - Dual Ch FXS Wideband VoicePort 100V 64-QFN | Microchip
The Microchip Technology ZL88801LDF1 is a dual-channel shared tracking Battery Wideband VoicePort device that provides complete BORSCHT functions for two telephone line FXS ports, housed in a 64-pin QFN EP (9x9 mm) package. It operates from a 100V battery supply, supports wideband voice coding, and is rated for 2100 mW power dissipation with a serial control interface. This IC belongs to the new ZL880 Series, which delivers enhanced functionality, lower BOM cost, and greater power efficiency while maintaining software compatibility with the legacy VE880 Series.
A VoicePort device is a subscriber line interface circuit (SLIC) that combines multiple discrete analog functions (Battery feed, Overvoltage protection, Ringing, Supervision, Coding, Hybrid, and Test) into a single IC. Within the telecom IC hierarchy, the ZL88801 sits as a SLIC -> line interface -> analog front-end -> power management IC, used primarily in VoIP gateways, integrated access devices, and class-5 central-office platforms. The wideband capability supports modern G.722 and Opus codecs by extending the audio passband beyond the 3.4 kHz limit of POTS telephony.
Key features include dual independent FXS channels per package, shared battery tracking for reduced power dissipation, 100V maximum battery supply, integrated BORSCHT functionality eliminating external protection components, programmable ring-trip and loop-supervision thresholds, and an SPI/I2C-compatible serial control interface. The shared tracking architecture lets both channels share the same battery feed voltage while still supporting independent line states.
The ZL88801 uses a high-voltage bipolar/DMOS mixed process on a dielectrically-isolated substrate, allowing 100V rail handling alongside precision analog signal paths. Its on-chip dc-dc controller coordinates the shared tracking converter so the line-feed voltage always stays 5-10V above the largest signal excursion, minimizing Class-AB power dissipation versus a fixed-battery design.
Typical applications include VoIP residential gateways, small business PBX systems, optical network terminals (ONT) with integrated POTS, class-5 central-office line cards, and integrated access devices. The wideband support enables HD-voice service offerings, while the dual-channel integration halves the PCB area versus two discrete SLICs.
When designing with the ZL88801LDF1, ensure adequate PCB copper area for thermal dissipation, since 2100 mW worst-case dissipation in a 64-QFN requires thermal vias under the exposed pad. Always program the ring-trip and off-hook thresholds is configurable. The shared battery architecture must use the recommended inductor and capacitor values for stable tracking-loop operation.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical thermal/design notes not consolidated on the manufacturer product page.
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