Overview
Description
The 821004 is a single-chip, four channel PCM CODEC with on-chip filters. The device provides analog-to-digital and digital-to-analog conversions and supports both a-law and m-law companding. The digital filters in 821004 provides the necessary transmit and receive filtering for voice telephone circuit to interface with time-division multiplexed systems. All of the digital filters are performed in digital signal processors operating from an internal clock, which is derived from MCLK. The fixed filters set the transmit and receive gain and frequency response.
Features
- 4-channel CODEC with on-chip digital filters
- Selectable A-law or μ-law companding
- Master clock frequency selection: 2.048MHz, 4.096MHz or 8.192MHz
- Internal timing automatically adjusted based on MCLK and frame sync signal
- Separate PCM and master clocks
- Single PCM port with up to 8.192MHz data rate (128 time slots)
- Transhybrid balance impedance hardware adjustable via external components
- Transmit gains hardware adjustable via external components
- Low power +5.0V CMOS technology
- +5.0V single power supply
Comparison
Applications
Documentation
Featured Documentation
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| Type | Title | Date |
| Datasheet | PDF 787 KB | |
| End Of Life Notice | PDF 1.43 MB | |
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Design & Development
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.
Processing table
| PLCC | 32 | Single-chip, 4-channel PCM CODEC with on-chip filters | Yes | Reel | 3 |
Tips for Using This Parametric Table:
- Hide Filters button in header: Collapse or expands filters
- Column sort buttons in header: Sort Column alphabetically / numerically descending or ascending
- Reset button in header: Reset all filters to the page default
- Full Screen button in header: Expand the table to full screen view (user must close out of full screen before they can interact with rest of page)
- Export button in header: Export the filtered results of the table to an Excel document
- Filter parts search bar in header: Type to filter table results by part number
- Hide column button in column headers: Select to hide columns in table
- AND / OR toggle switches in header: Toggles the logic of this particular filter to be “AND” or “OR” logic for filtering results
- Multiselect checkboxes at beginning of each row in table: Select these checkboxes to compare products against each other
- Document icon next to product name in row: View the featured document for this product
- Chip icon next to the right of the document icon in row: View the block diagram for this product
- Cart icon to the right of the chip icon: Indicates that samples are available for this product