Texas Instrument SR1622AB +5, +8V, 4-CHANNEL GMR READ/WRITE DEVICE

Salvage from Harddisk read/write head

FEATURES

• One side grounded input, fully differential output
• Unselected Read/Write heads at GNDpotential
• Thermal asperity detection and compensation
• MR resistor measurement mode
• MR bias current range = 2 to 9.75mA (5bit) (all range guaranteed)
• MR resistor range =25 to 75 Ω
• Programmable read gain =150 V/V or 190 V/V@45Ω, IMR=6 mA
• Input equivalent noise 1.1 nV/√Hz @45Ω (TBD)
• Read Frequency boost
• Write current range = 16.17 to 61.20 mA (5bit)
• Active write damping
• Programmable write current boost control (2 bit)
• Programmable write current undershoot control (1 bit)
• Impedance matched differential write data input, no flip-flop
• Bank write mode
• Power fault protection
• 3.3 V CMOS compatible logic interface
• Fast write current rise/fall times = 0.9 ns (Ltf = 90 nH, Rtf = 18 Ω, Iw = 39.65 mA)
• GMR pin layer reset voltage pulse capability
• Internal reference resistor



Datasheet