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| LD3301-X 1 and 2-Channel 5V or 3.3V GMR Head Preamplifier DESCRIPTION The LD3301-1, LD3301-2 are BiCMOS devices that support a 1-channel (2-channel) GMR Preamplifier. 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. Fast recovery mode can be also programmed to put the chip faster in read mode from any other existing modes. The device is programmable for 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. Available in flip-chip or TSSOP packages. GMR resistor range: 25 to 65 Programmable 5 bit GMR head bias current: Ib = 2mA-9.75mA Programmable gain control: 130V/V & 200V/V @ Rmr = 35, Ib = 6mA Wide bandwidth: BW = 250 MHz at -1dB @ Rmr = 35 Programmable booster for wide bandwidth Equivalent input noise: Vn = 0.8nV/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: 1ns@5V / 2ns@3.3V Typical (Iw = 40mA (0-p), Ltf = 50nH, Rtf = 15) Fast recovery times: W/R = 200ns @ 5V supply, W/R= 400ns @ 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 FEATURES Current Bias/Current Sense Architecture +5V or +3.3V 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 RGND GND RREF VCC SDEN SCLK SDATA SERIAL PORT AND DATA REGISTER HEAD SELECT 2K READ BIAS CONTROL DUMMY HEAD RBW MRRB MODE CONTROL POWER MANAGEMENT LOW VOLTAGE FAULT MR BIAS CURRENT 5-BIT DAC WRITE CURRENT 5-BIT DAC TA DETECTION THRESHOLD 7-BIT DAC THERMAL ASPERITY DETECTION AND CORRECTION W0X W0Y R0 MRGND PREAMPS AND WRITE DRIVERS RDX RDY READ OUTPUT BUFFER WDX WDY PECL INPUT BUFFER HEAD UNSAFE DETECT HEAD VOLTAGE MEASUREMENT FLT LDIC Confidential 1 version 1.6.2 |
Price & Availability of LD3301-X
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