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TDA5155

Pre-amplifier for Hard Disk Drive (HDD) with MR-read/inductive write heads

Philips Electronics 

Philips Semiconductors

Pre-amplifier for Hard Disk Drive (HDD)

with MR-read/inductive write heads

Preliminary specification

TDA5155

Notes to the recommended operating conditions

1. A supply by-pass capacitor from VCC to ground or a

low pass filter may be used to optimize the PSRR.

2. The supply voltage VCC(WD) must never be below VCC

in normal mode, and two diode 1.4 V above VCC in

servo mode.

3. The given values should be interpreted in the way that

the single ended voltage could swing from

0.2 to 0.75 V, and that the common mode voltage

should be such that for any of the two states, the

VIH(PECL) is less than VCC and VIL(PECL) is more than

1.5 V.

PECL voltage swing: a wider peak-to-peak voltage

swing can be used. In that case a current will flow

through the WDI inputs. This current is approximately

equal to W-------D----I--x-----(--v----)----–----2-W--0---0-D----I---y----(---v---)----–-----1---.--4--

4. Same comments for the given values as for the

voltage input mode. The HIGH (respectively LOW)

level input current is defined such that it produces the

same effect at the output of the writer (Wx, Wy) as the

HIGH (resp. LOW) level input voltage.

5. The mismatch refers to the resistance of the two

stripes of the same head. This is defined as follows:

∆(RMR) = abs(RMR1 − RMR2).

6. These parameters depend on the head model.

The data given in the table are those used for testing.

7. The combination of maximum head resistance, lead

resistance and bias current is not permitted. To avoid

voltage breakthrough between heads and disk, the

voltage over the MR elements is limited by two diode

voltages.

1997 Apr 08

17

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