This document describes the features and characteristics of MITSUMI 3-Input 2-Output 3-Circuit Video Switch MM1238, which is suitable for large and medium-sized high quality TVs with 3-input and 2-output circuits.
The MM1238 is a monolithic video switch IC designed for large and medium‑size high‑quality TVs and other video equipment such as VCRs. It provides three video inputs and two video outputs, with optional external output featuring a 6 dB gain, 75 Ω termination and 1 V p‑p level.
Key electrical characteristics include a power‑supply range of 8.0 V to 13.0 V, input impedances of 15 kΩ (video) and 68 kΩ (audio), output impedance of 50 Ω, crosstalk performance of –60 dB (Vin‑Vout) at 4.43 MHz and –80 dB (Rin‑Rout) at 1 kHz, and operating temperature from –20 °C to +75 °C.
| Power supply voltage | 15 V |
|---|---|
| Operating voltage range | 8.0 V – 13.0 V |
| Storage temperature | -40 °C – +125 °C |
| Operating temperature | -20 °C – +75 °C |
| Input impedance (video) | 15 kΩ |
| Output impedance | 50 Ω |
| Crosstalk (Vin‑Vout) | -60 dB at 4.43 MHz |
The device operates from 8.0 V to 13.0 V.
It can operate from –20 °C to +75 °C.