The MAX9532 DirectDrive® video filter amplifier is specifically designed to work in harsh environments such as automobiles. The MAX9532 provides integrated short-to-battery protection, allowing the output of the device to survive shorts up to 18V. Maxim’s DirectDrive technology eliminates large output coupling capacitors and sets the output video black level near ground. DirectDrive requires an integrated charge pump and an internal linear regulator to create a clean negative power supply so that the amplifier can pull the sync below ground. The charge pump injects so little noise into the video output that the picture is visibly flawless. The MAX9532 features an internal reconstruction filter that smoothes the steps and reduces the spikes on the video signal from the video digital-to-analog converter (DAC). The reconstruction filter typically provides ±1dB passband flatness of 9.5MHz and 42dB attenuation at 27MHz. The input of the MAX9532 can be directly connected to the output of a video DAC. The MAX9532 also features a transparent input sync-tip clamp, allowing AC-coupling of input signals with different DC biases. The MAX9532 features an internal fixed gain of 4V/V. The input full-scale video signal is nominally 0.5VP-P, and the output full-scale video signal is nominally 2VP-P. The short-to-battery protection utilizes an internal switch in series with the amplifier output. When the MAX9532 detects that the output is short circuited to the battery voltage
The MAX9532 DirectDrive® video amplifier is designed for harsh automotive environments and provides integrated short‑to‑battery protection that tolerates shorts up to 18 V. It eliminates large output coupling capacitors, sets the video black level near ground, and uses an internal charge pump and linear regulator to generate a clean negative supply.
The device features a fixed internal gain of 4 V/V, a five‑pole Butterworth reconstruction filter with +1 dB passband flatness at 9.5 MHz and 42 dB attenuation at 27 MHz, and supports both DC‑coupled and AC‑coupled inputs via a transparent sync‑tip clamp. It is supplied in a 10‑pin UMAX package and operates from –40 °C to +125 °C.
| Supply Voltage Range | 3.0 V – 3.6 V |
|---|---|
| Internal Fixed Gain | 4 V/V |
| Passband Flatness | +1 dB at 9.5 MHz |
| Attenuation at 27 MHz | 42 dB |
| Short‑to‑Battery Protection Voltage | Up to 18 V |
| Operating Temperature Range | -40 °C to +125 °C |
| Quiescent Supply Current | 15 mA – 23 mA |
| Output Voltage Swing | -0.3 V to +0.7 V |
| Package Type | 10‑pin UMAX (3 mm × 3 mm) |
The protection works for output shorts up to 18 V.
The amplifier has a fixed internal gain of 4 V/V.
It operates from 3.0 V to 3.6 V.
It is rated for –40 °C to +125 °C operation.