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General Description

The MAX9532 DirectDrive

video filter amplifier is

specifically designed to work in harsh environments

such as automobiles. The MAX9532 provides integrat-

ed 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 0.5V

P-P

, and the

output full-scale video signal is nominally 2V

P-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 internal switch is disabled, protecting the

MAX9532 from voltages up to 18V.

The MAX9532 is available in a 3mm x 3mm, 10-pin

µMAX

package and is specified over the -40°C to

+125°C automotive operating temperature range.

Features

♦ Short-to-Battery Protection on Video Output (Up

to 18V)

♦ DirectDrive Sets Video Output Black Level Near

Ground

♦ DirectDrive Eliminates DC-Blocking Capacitors at

the Output

♦ 3.3V Single-Supply Operation

♦ Reconstruction Filter with 9.5MHz Passband and

42dB Attenuation at 27MHz

♦ DC-Coupled Input/Output

♦ Transparent Input Sync-Tip Clamp

♦ 4V/V Internal Fixed Gain

MAX9532

DirectDrive Video Amplifier with

Short-to-Battery Protection

________________________________________________________________

Maxim Integrated Products

19-4431; Rev 0; 2/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

Ordering Information

PART PIN-PACKAGE TEMP RANGE

MAX9532AUB+ 10 µMAX -40°C to +125°C

Denotes a lead(Pb)-free/RoHS-compliant package.

DirectDrive is a registered trademark of Maxim Integrated Products, Inc.

µMAX is a registered trademark of Maxim Integrated Prodcuts, Inc.

JACKSENSE

OUT

TRANSPARENT

CLAMP

LINEAR

REGULATOR

= 4V/V

CHARGE

PUMP

LPF

MAX9532

500mV

P-P

VIDEO

P-P

VIDEO

Simplified Block Diagram

Applications

Automotive Infotainment Systems

Pin Configuration and Functional Diagram/Typical

Application Circuits appear at end of data sheet.

Summary of content (12 pages)

PAGE 1
9-4431; Rev 0; 2/09 KIT ATION EVALU E L B AVAILA DirectDrive Video Amplifier with Short-to-Battery Protection Features ♦ Short-to-Battery Protection on Video Output (Up to 18V) ♦ DirectDrive Sets Video Output Black Level Near Ground ♦ DirectDrive Eliminates DC-Blocking Capacitors at the Output ♦ 3.3V Single-Supply Operation ♦ Reconstruction Filter with 9.
PAGE 2
MAX9532 DirectDrive Video Amplifier with Short-to-Battery Protection ABSOLUTE MAXIMUM RATINGS VDD to GND ..............................................................-0.3V to +4V VDD to CPGND .........................................................-0.3V to +4V CPGND to GND.....................................................-0.1V to +0.1V IN to GND .................................................................-0.3V to +4V JACKSENSE to GND........................................
PAGE 3
DirectDrive Video Amplifier with Short-to-Battery Protection (VDD = 3.3V, GND = CPGND = 0, RL = 100Ω to GND, C1 = C2 = C3 = 1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL Output Voltage Swing CONDITIONS MIN TYP MAX Measured at output, VDD = 3.135V, VIN = VCLP to (VCLP + 0.7V), RL = 100Ω to -2V and +2V 2.744 2.8 2.856 Measured at output, VDD = 3V, VIN = VCLP to (VCLP + 0.5V), RL = 100Ω to -2V and +2V 1.
PAGE 4
ELECTRICAL CHARACTERISTICS (continued) (VDD = 3.3V, GND = CPGND = 0, RL = 100Ω to GND, C1 = C2 = C3 = 1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 220 440 660 kHz CHARGE PUMP Switching Frequency fCP Note 1: All devices are 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by design. Typical Operating Characteristics (VDD = 3.
PAGE 5
DirectDrive Video Amplifier with Short-to-Battery Protection QUIESCENT CURRENT vs. TEMPERATURE 4.018 4.016 14.67 4.014 14.66 GAIN (V/V) SUPPLY CURRENT (mA) 14.68 MAX9532 toc08 VSS = 3.3V VIN = 0V NO LOAD 14.69 DC GAIN vs. TEMPERATURE 4.020 MAX9532 toc07 14.70 14.65 14.64 14.63 4.012 4.010 4.008 4.006 14.62 14.61 4.004 14.60 4.002 4.000 14.59 -40 10 60 110 10 -40 TEMPERATURE (°C) OUTPUT VOLTAGE vs. INPUT VOLTAGE 0 -1 -2 0 0.2 0.4 0.6 0.8 1.0 1.
PAGE 6
MAX9532 DirectDrive Video Amplifier with Short-to-Battery Protection Typical Operating Characteristics (continued) (VDD = 3.3V, GND = CPGND = 0, video output has RL = 100Ω to GND, C1 = C2 = C3 = 1μF, TA = +25°C, unless otherwise noted.
PAGE 7
DirectDrive Video Amplifier with Short-to-Battery Protection PIN NAME 1 VDD Positive Power Supply. Bypass VDD with a 1µF capacitor to GND. FUNCTION 2 C1P Charge-Pump Flying Capacitor Positive Terminal. Connect a 1µF ceramic capacitor from C1P to C1N. 3 CPGND Charge-Pump Ground. Connect to GND. Charge-Pump Flying Capacitor Negative Terminal. Connect a 1µF ceramic capacitor from C1P to C1N. 4 C1N 5 CPVSS 6 VSS Negative Power Supply. Connect VSS to CPVSS.
PAGE 8
MAX9532 DirectDrive Video Amplifier with Short-to-Battery Protection INPUT 500mV/div INPUT 500mV/div 0V OUTPUT 500mV/div 2ms/div 0V OUTPUT 1V/div 2ms/div Figure 1. AC-Coupled Output Figure 2. DirectDrive Output With the DirectDrive amplifier, the black level is held at ground. The video signal is constrained between -0.3V to +0.7V. Figure 2 shows the video signal from a DirectDrive amplifier with the same input signal as the AC-coupled system.
PAGE 9
DirectDrive Video Amplifier with Short-to-Battery Protection IMAGE PROCESSOR ASIC 0V TO 1V MAX9532 GENERIC 2V/V CONFIGURATION IMAGE PROCESSOR ASIC MAX9532 0V TO 0.5V DAC LPF 2V/V DAC 2VP-P 150Ω Figure 3. Typically, a Video DAC Generates a 1VP-P Signal Across a 150Ω Resistor Connected to Ground LPF 4V/V 2VP-P 75Ω Figure 4. Video DAC Generates a 0.5VP-P Signal Across a 75Ω Resistor Connected to Ground Table 1.
PAGE 10
MAX9532 DirectDrive Video Amplifier with Short-to-Battery Protection VDD VIDEO ASIC DAC MAX9532 JACKSENSE AV = 4V/V Y OUT IN AMP LPF 50Ω 0.1μF DAC C 50Ω 3.3V CLAMP VDD C3 1μF LINEAR REGULATOR DC LEVEL SHIFT CHARGE PUMP GND CPGND C1P C1N CPVSS VSS C2 1μF || 10nF Figure 5. Luma (Y) and Chroma (C) Signals are Added Together to Create a Composite Video Signal, Which is AC-Coupled into the MAX9532 Power-Supply Bypassing and Ground Management The MAX9532 operates from a 3V to 3.
PAGE 11
DirectDrive Video Amplifier with Short-to-Battery Protection VDD VIDEO ASIC MAX9532 JACKSENSE AV = 4V/V OUT IN DAC MAX9532 Functional Diagram/Typical Application Circuits (DC-Coupled Input/Inactive Input Clamp) AMP LPF 50Ω 50Ω 3.
PAGE 12
Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 10 µMAX U10+2 21-0061 10LUMAX.EPS MAX9532 DirectDrive Video Amplifier with Short-to-Battery Protection α α Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.