Features: ` Operate From a Single 5-V Supply (±10%)` Low-Power Dissipation: Read Mode = 105 mW Typical Idle Mode = 0.5 mW Typical` High Performance: Read-Mode Gain = 300 V/V Typical Input Noise = 0.50 nV / Hz Typical Input Capacitance = 8.5 pF Typical Write-Current Range = 3 mA to 35 mA` Ban...
TLS2158: Features: ` Operate From a Single 5-V Supply (±10%)` Low-Power Dissipation: Read Mode = 105 mW Typical Idle Mode = 0.5 mW Typical` High Performance: Read-Mode Gain = 300 V/V Typical Input Noise ...
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The TLS2154, TLS2156, and TLS2158 are BiCMOS, monolithic preamplifiers designed for two-terminal thin-film or metal-in-gap (MIG) recording heads. The preamplifiers incorporate data-protection circuitry for all channels and feature low-noise read paths and write-current controls. When deactivated, the preamplifiers enter an idle mode that reduces power dissipation to 0.5 mW, typically. The write-current generator is disabled during power sequencing to provide power-supply fault protection.
During write and idle modes, the differential read-data (RDX and RDY) lines are placed in a high-impedance state to improve system write-to-read and idle-to-read recovery times. The servo-write feature allows increased throughput at the servo-write stage. TLS2154, TLS2156, and TLS2158 have multiple-head-select servo-write functions. Isolated damping resistors effectively switch out the resistance during read operations.
The 24-pin TLS2154 and 36-pin TLS2158 provide optional shield-line pins located adjacent to the outer-head pins that, when bonded out, can be used to reduce the effects of mutual inductance. The TLS2154, TLS2156, and TLS2158 optional flip-flop for write-data input can be enabled or disabled.