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| XX-XXXX; Rev 0; 9/05 Programmable Spread-Spectrum and DC-Balance 21-Bit Deserializer General Description The MAX9232 deserializes three LVDS serial-data inputs into 21 single-ended LVCMOS/LVTTL outputs. A separate parallel-rate LVDS clock provides the timing for deserialization. The MAX9232 features spread-spectrum capability, allowing the output data and clock frequency to spread over a specified range to reduce EMI. The single-ended data and clock outputs are programmable for a frequency spread of 2%, 4%, or no spread. The spread-spectrum function is also available when the MAX9232 operates in non-DC-balanced mode. The modulation rate of the spread is 32kHz for a 33MHz LVDS clock input and scales linearly with frequency. Using VSYNC on RxOUT13 and HSYNC on RxOUT6, a reset of the spread-spectrum FIFO is performed every frame, preventing FIFO overflow and underflow. The single-ended outputs have a separate supply, allowing +1.8V to +5V output logic levels. The MAX9232 features programmable DC balance, allowing isolation between a serializer and deserializer using AC-coupling. The MAX9232 operates with the MAX9209/MAX9213 serializer and has a falling-edge strobe. The LVDS inputs meet ISO 10605 ESD specifications with 25kV Air-Gap Discharge and 8kV Contact Discharge ratings. The MAX9232 is available in a 48-pin TSSOP package and operates within the -40C to +85C temperature range. Features o Programmable 4%, 2%, or OFF Spread-Spectrum Output for Reduced EMI o Programmable DC Balance or Non-DC Balance o DC Balance Allows AC-Coupling for Wider Input Common-Mode Voltage Range o Spread Spectrum Operates in DC-Balanced or NonDC-Balanced Mode o FIFO Reset During Vertical Blanking o 16MHz-to-34MHz (DC-Balanced) and 20MHz-to40MHz (Non-DC-Balanced) Operation o High-Impedance Outputs when PWRDWN is Low Allow Output Busing o Fail-Safe Inputs in Non-DC-Balanced Mode o Separate Output Supply Pins Allow Interface to +1.8V, +2.5V, +3.3V, and +5V Logic o LVDS Inputs Meet ISO 10605 ESD Protection at 25kV Air Discharge and 8kV Contact Discharge o LVDS Inputs Meet IEC 61000-4-2 Level 4 ESD Protection at 15kV Air and 8kV Contact Discharge o LVDS Inputs Conform to ANSI TIA/EIA-644 Standard o +3.3V Main Power Supply MAX9232 Pin Configuration TOP VIEW RxOUT17 RxOUT18 GND RxOUT19 RxOUT20 SSG DCB 1 2 3 4 5 6 7 48 47 46 45 44 43 42 41 40 39 38 37 VCCO RxOUT16 RxOUT15 RxOUT14 GND RxOUT13 VCC RxOUT12 RxOUT11 RxOUT10 GND RxOUT9 VCCO RxOUT8 RxOUT7 RxOUT6 GND RxOUT5 RxOUT4 RxOUT3 VCCO RxOUT2 RxOUT1 GND Applications Automotive Navigation Systems Automotive DVD Entertainment Systems Digital Copiers Laser Printers RxIN0- 8 RxIN0+ 9 RxIN110 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Ordering Information PART MAX9232EUM TEMP RANGE -40C to +85C PIN-PACKAGE 48 TSSOP PKG CODE U48-1 RxIN1+ LVDSVCC LVDSGND RxIN2RxIN2+ RxCLKINRxCLKIN+ LVDSGND PLLGND PLLVCC PLLGND PWRDWN RxCLKOUT RxOUT0 MAX9232 36 35 34 33 32 31 30 29 28 27 26 25 TSSOP ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. |
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