VM216

The VM216 has the following features including Wide Bandwidth: 45 MHz;Operates Over a Wide Supply Range of 7.2 V to 12.6 V;Including 12.0V (Vcc - VEE);Low Output Offset Voltage: ±50 mV Typical;Available in a 8-lead PDIP, SOIC;IBM-Compatible;For use in Winchester Disk Drives.

The The VM216 is a low-noise, wide-bandwidth differential amplifier. Originally designed for use in the servo system of IBM-equivalent 3380 type disk drives,the VM216 may find use in a variety of applications rquireing very low noise levels and high-signal amplification.In the read mode the circuit operates as a low-noise differential amplifier. The write-current source is turned off and the write-data flip-flop is set. The selected head provides a differential input. The RDX and RDY pins provide differential emitter follower outputs which are in phase with the X and Y inputs and should be AC coupled to the load.  Write current is deactivated for both the read and idle mode so that external gating is not required.In the idle mode (CS=high level) both the read amp and write driver are disabled and the devices power dissipation is minimal. The internal write current reference is disabled and the RDX, RDY outputs are in a high impedance state.  Hence,for multiply chip usage. The RDX, RDY outputs maybe wire OR'ed, and a common write current resistor (RWC) may be used to set the write current.

The VM216 products described in this document are designed, developed and manufactured as contemplated for general use, including without limitation, ordinary industrial use, general office use, personal use, and household use, but are not designed, developed and manufactured as contemplated (1) for any use that includes fatal risks or dangers that, unless extremely high safety is secured, could have a serious effect to the public, and could lead directly to death, personal injury, severe physical damage or other loss (i.e., nuclear reaction control in nuclear facility, aircraft flight control, air traffic control, mass transport control, medical life support system, missile launch control in weapon system), or (2) for any use where chance of failure is intolerable (i.e., submersible repeater and artificial satellite).