The NJW1138 is an audio processor that includes all the functions for processing TV audio signals, such as tone control, balance, volume, mute, NJRC original surround, and AGC functions. The NJRC original surround system reproduces natural surround sound and clear vocal orientation. All of internal status and variables are controlled by I2C BUS interface.
The NJW1138 is an audio processor designed for TV applications. It offers tone control, balance, volume, mute, a proprietary surround system, and AGC functions, all controllable via a PC (I2C) bus interface.
The handbook lists detailed electrical characteristics such as an operating voltage of 8‑13 V, supply current up to 25 mA, and audio performance specs including maximum input/output voltages, total harmonic distortion of 0.5 %, and gain ranges of ±2 dB. Pin assignments for the 30‑pin SDIP package and typical characteristic curves for tone, AGC, and surround processing are also provided.
| Operating Voltage | 8.0‑13.0 V |
|---|---|
| Supply Current | up to 25 mA |
| Reference Voltage | 4.0‑5.0 V |
| Maximum Gain | -2.0 dB to +2.0 dB |
| Output Noise (0 dB) | -90 dBV to -85 dBV |
The NJW1138 operates from 8.0 V to 13.0 V.
The device uses a 30‑pin SDIP package; pin 1 (INa) is the audio input, pin 4 (OUT1a) is the audio output, and pin 30 (INb) is the B‑channel input.
All internal status and variables are controlled via an I²C (PC) bus interface.