TZA1000 Просмотр технического описания (PDF) - Philips Electronics

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TZA1000

QIC read-write amplifier

Philips Electronics 

Philips Semiconductors

QIC read-write amplifier

Preliminary specification

TZA1000

Table 8 HPF circuit

DIFF

0

1

HPF CIRCUIT

bypassed

on

Table 9 Variable gain circuit input select

HSM

HOLD

AI1

AI0

0

X

0

0

0

X

0

1

0

X

1

0

0

X

1

1

1

1

0

0

1

1

0

1

1

1

1

0

1

1

1

1

1

0

X

X

INPUT

servo preamplifier

preamplifier

bias output −10 dB

bias output −4 dB

servo preamplifier

preamplifier

bias output −10 dB

bias output −4 dB

servo preamplifier

Table 10 Bias circuit input

FBI1

0

0

1

1

FBI0

0

1

0

1

INPUT

no signal

preamplifier

test generator

preamplifier

Table 11 Preamplifier gain

PG1

0

0

1

1

PG0

0

1

0

1

GAIN

0

34 dB

4 dB

40 dB

Table 12 AGC setting

HSM

0

0

1

1

X

HOLD

1

0

1

0

X

GFXD

0

0

0

0

1

AGC

on

frozen at last value

on

no AGC at servo mode: maximum gain

off, gain set by G0 to G3; note 1

Note

1. Control bits G0 to G3 make up a 4-bit number used to program the gain in 1 dB steps (from 4 to 19 dB if G6DB is 0,

from 10 to 25 dB if G6DB is 1; see Table 13).

Table 13 Variable gain circuit range select

G6DB

0

1

RANGE

4 to 19 dB

10 to 25 dB

1998 Mar 17

11

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