The MAX11503 is a low-power video amplifier with a Y/C summer and chroma mute. The device accepts an S-video or Y/C input and sums the luma (Y) and chroma (C) signals into a composite CVBS signal which can be connected directly to a TV monitor. The MAX11503 drives two terminated 75Ω video coax cables. The MAX11503 features include chroma mute, power save, and SAG correction. Chroma mute disables the chroma buffer. If the device is used to combine Y and C signals in a camera application, the chroma mute may be used in low-light situations. This removes all chroma including burst which causes a downstream composite video decoder to interpret the video signal as luminance only, thus improving image quality. SAG correction allows small output capacitors to be used in AC-coupled output applications. The MAX11503 operates from a single 2.7V to 5.25V supply, is specified over the extended -40°C to +85°C temperature range, and is available in a small 8-pin µMAX® package.
The MAX11503 video Y/C summer combines S‑video or Y/C inputs into a composite CVBS signal and can drive two terminated 75 Ω video coax cables. It offers chroma mute to disable chroma and burst for monochrome output, a power‑save mode that reduces supply current to 0.5 µA, and SAG correction to allow small output capacitors.
The device operates from a single 2.7 V to 5.25 V supply over –40 °C to +85 °C, includes an internal AC‑coupling capacitor for the chroma input, and provides short‑circuit protection limited to 130 mA per output. Recommended PCB layout includes an exposed pad tied to ground and decoupling capacitors placed close to the IC.
| Supply Voltage Range | 2.7 V – 5.25 V |
|---|---|
| Operating Temperature Range | -40 °C to +85 °C |
| Output Drive Capability | Drives two terminated 75 Ω video coax cables |
| Power‑Save Current | ≈0.5 µA |
| Short‑Circuit Protection | 130 mA per output (typical) |
| Recommended SAG Capacitors | COUT = 120 µF, CSAG = 68 µF |
| Package Type | 8‑Pin UMAX‑EP (exposed pad) |
It operates from 2.7 V up to 5.25 V.
It can drive two terminated 75 Ω video coaxial cables.
When CMUTE is driven high, it disables the chroma buffer and burst, producing a monochrome composite video output.
In power‑save mode the supply current is reduced to about 0.5 µA.