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Features
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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
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3431AS-NETST-2/04

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