The TP3094 is a monolithic PCM Codec and Filter device implemented using a digital signal processing architecture. It provides four voice channels, combining transmit bandpass and receive low pass channel filters with companding A-law or m-law PCM encoders and decoders. The device is fabricated using National’s advanced CMOS process. The device includes anti-aliasing filters and sigma-delta converters dedicated to each channel, and by a common signal processing unit which performs all the remaining filtering and processing for the four channels. The TP3094 includes a flexible PCM digital interface, which allows the device to be connected to PCM busses of different formats. It can also be connected with other TP3094 devices in a cascade fashion, for a system with up to 128 POTS interfaces (when a 2.048MHz PCM bus is used).
The TP3094 is a monolithic quad‑channel PCM codec and filter implemented with a digital signal‑processing architecture. It provides four voice channels with transmit band‑pass and receive low‑pass filters, A‑law or μ‑law companding, and flexible PCM bus interfaces. The device can be cascaded with up to 32 units for a total of 128 POTS interfaces when using a 2.048 MHz PCM bus.
The manual includes a general description, pin descriptions, functional operation, power‑up/down behavior, test modes, timing diagrams, and mechanical dimensions. It also lists electrical specifications such as supply requirements, temperature range, and signal levels.
| Supply Voltage | +5 V ±5 % |
|---|---|
| Package Type | 44‑lead PLCC |
| Operating Temperature Range | -40 °C to 85 °C |
| Maximum Analog Input Level | 1.12 V rms |
| Maximum Analog Output Level | 1.12 V rms (5 kΩ + 100 pF load) |
| Power‑Down Consumption | ≈ 2 mW |
| Supported MCLK Frequencies | 8.192 MHz, 4.096 MHz, 2.048 MHz, 1.536 MHz/1.544 MHz |
| Maximum Cascadable Channels | 128 channels (32 devices) |
The device requires a +5 V supply with a tolerance of ±5 %.
Up to 128 channels can be cascaded by using 32 TP3094 devices.
The device operates from –40 °C to +85 °C.