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| Features * * * * * * * * * * * * * * * * * * * * * * * * * * * Current Bias/Current Sense Architecture 3.3 or 5V Supply 3.3V CMOS Compatible Logic Interface Power Management Integrated Reference Resistor Single-ended Input to Reader with One Side Grounded Externally Differential Read Output GMR Resistor Range: 25 to 65 Programmable 5-bit GMR Head Bias Current: Ib = 2 mA - 9.75 mA Programmable Gain Control: 130V/V & 200V/V @ Rmr = 35, Ib = 6 mA Wide Bandwidth: BW = 150 MHz at -3dB @ Rmr = 35 Programmable Booster for Wide Bandwidth Equivalent Input Noise: Vn = 0.8 nV/Hz @ Rmr = 35 Impedance Matched Differential Inputs for WDX and WDY Programmable 5-Bit Write Head Current: Iw = 15 mA to 60 mA Servo Bank Write Mode Rise/Fall Time: 1 ns @ 5V and 2 ns @ 3.3V Typical (Iw = 40 mA (0-p), Ltf = 50 nH, Rtf = 15) Fast Recovery Times: W/R = 200 ns @ 5V Supply and W/R= 400 ns @ 3.3V Supply Programmable Write Current Overshoot Control Read Fault and Write Fault Detection Rmr Value Measurement Mode GMR Head Open/Short and TF Head Protection Programmable (7 bits) Thermal Asperity Detection Threshold Control and Programmable Thermal Asperity Compensation Serial Port Read Back Capability GMR ESD Protection Diodes on Reader Internal Capacitor Available in a Variety of Packages Depending on Customer Requirements 1-Channel 3.3V or 5V GMR Head Preamplifier AT78C6001 Summary Description The AT78C6001 is a BiCMOS 1-channel GMR Preamplifier device (also available as a 2-channel device, AT78C6002). They are designed for use with 4-terminal magnetoresistive recording heads, providing a low noise GMR head amplifier, GMR bias current control, thin film write driver, write current control, thermal asperity detection and correction. The fast recovery mode can be also programmed to put the chip in read mode faster than any other existing modes. The device provides programmable read gain, GMR resistance measurement, and thermal asperity threshold level. The device allows multiple channel write functions for servo writing. Half or all of the heads can be simultaneously selected in the servo write mode. Features and thresholds are controlled through a serial port interface. This product requires +3.3V or +5V supply voltage. It is available in Flip-chip or TSSOP packages. 3431AS-NETST-2/04 Note: This is a summary document. A complete document is available under NDA. For more information, please contact your local Atmel sales office. Figure 1. Block Diagram RGND GND RREF SDEN SCLK SDATA VCC Serial Port and Data Register Head Select 2K Read Bias Control Dummy Head W0X RBW MRRB MR Bias Current 5-bit DAC Mode Control Power Management Low Voltage Fault Write Current 5-bit DAC TA Detection Threshold 7-bit DAC Thermal Asperity Detection and Correction Preamps and Write Drivers W0Y R0 MRGND RDX RDY Read Output Buffer WDX WDY PECL Input Buffer Head Unsafe Detect Head Voltage Measurement FLT 2 AT78C6001 3431AS-NETST-2/04 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 1150 East Cheyenne Mtn. Blvd. Colorado Springs, CO 80906, USA Tel: 1(719) 576-3300 Fax: 1(719) 540-1759 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel: (33) 2-40-18-18-18 Fax: (33) 2-40-18-19-60 Biometrics/Imaging/Hi-Rel MPU/ High Speed Converters/RF Datacom Avenue de Rochepleine BP 123 38521 Saint-Egreve Cedex, France Tel: (33) 4-76-58-30-00 Fax: (33) 4-76-58-34-80 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 ASIC/ASSP/Smart Cards Zone Industrielle 13106 Rousset Cedex, France Tel: (33) 4-42-53-60-00 Fax: (33) 4-42-53-60-01 1150 East Cheyenne Mtn. Blvd. Colorado Springs, CO 80906, USA Tel: 1(719) 576-3300 Fax: 1(719) 540-1759 Scottish Enterprise Technology Park Maxwell Building East Kilbride G75 0QR, Scotland Tel: (44) 1355-803-000 Fax: (44) 1355-242-743 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Literature Requests www.atmel.com/literature Disclaimer: Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company's standard warranty which is detailed in Atmel's Terms and Conditions located on the Company's web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel's products are not authorized for use as critical components in life support devices or systems. (c) Atmel Corporation 2004. All rights reserved. Atmel(R) and combinations thereof, are the registered trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be the trademarks of others. Printed on recycled paper. 3431AS-NETST-2/04 |
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