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

CONTROL REGISTER

The control register contains six 8-bit entries configured as shown in Table 1.

Table 1 Control register settings

ADDRESS

0

1

2

3

4

5

D7

−

HSM

−

−

WDM

SDB

D6

FC1

DIFF

−

−

W6

S6

D5

FC0

AI1

G6DB

−

W5

S5

D4

ENFB1

AI0

GFXD

B4

W4

S4

D3

ENFB0

FBI1

G3

B3

W3

S3

D2

ENS

FBI0

G2

B2

W2

S2

D1

ENRD

PG1

G1

B1

W1

S1

D0

ENREF

PG0

G0

B0

W0

S0

Control bits

Control bit functions are detailed in Tables 2 to 17.

Table 2 HPF and LPF cut-off frequency

FC1

FC0

0

0

0

1

1

0

1

1

FREQUENCY

1 MHz

2 MHz

4 MHz

10 MHz

Table 3 Bias current settings; note 1

ENFB1

0

0

1

1

ENFB0

0

1

0

1

BIAS CIRCUIT

off

on

on

on

Ibias(min)

0

−10 mA

0

−10 mA

Ibias(max)

0

+10 mA

+10 mA

+20 mA

Note

1. Control bits B0 to B4 make up a 5-bit number between 0 and 31. The DC bias voltage between BIASA and BIASB

(pins 23 and 24) is B × 45 mV. BIASA is positive with respect to BIASB.

Table 4 Sense current circuit

ENS

0

1

SENSE CURRENT CIRCUIT

disabled

enabled

Table 5 Read circuits (excluding preamplifiers)

ENRD

0

1

READ CIRCUITS

disabled

enabled

Table 6 Internal reference voltages

ENREF

0

1

INTERNAL REF. VOLTAGES

disabled

enabled

Table 7 HOLD pin function

HSM

0

1

FUNCTION

AGC hold on or off

select servo or data preamplifier

1998 Mar 17

10

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