tza1000 NXP Semiconductors, tza1000 Datasheet - Page 10

• Manufacturer Part Number: tza1000
• Description: Qic Read-write Amplifier
• Manufacturer: NXP Semiconductors

Philips Semiconductors
CONTROL REGISTER
The control register contains six 8-bit entries configured as shown in Table 1.
Table 1 Control register settings
Control bits
Control bit functions are detailed in Tables 2 to 17.
Table 2 HPF and LPF cut-off frequency
Table 3 Bias current settings; note 1
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
Table 4 Sense current circuit
Table 5 Read circuits (excluding preamplifiers)
1998 Mar 17
QIC read-write amplifier
ADDRESS
(pins 23 and 24) is B 45 mV. BIASA is positive with respect to BIASB.
ENRD
ENS
0
1
2
3
4
5
ENFB1
0
1
0
1
0
0
1
1
FC1
0
0
1
1
WDM
HSM
SDB
D7
SENSE CURRENT CIRCUIT
READ CIRCUITS
ENFB0
DIFF
disabled
disabled
FC1
enabled
enabled
W6
D6
S6
0
1
0
1
G6DB
FC0
AI1
W5
D5
S5
BIAS CIRCUIT
FC0
ENFB1
off
on
on
on
10
GFXD
0
1
0
1
AI0
W4
D4
B4
S4
Table 6 Internal reference voltages
Table 7 HOLD pin function
ENREF
HSM
0
1
0
1
ENFB0
FBI1
W3
D3
G3
B3
S3
I
bias(min)
10 mA
10 mA
0
0
select servo or data preamplifier
INTERNAL REF. VOLTAGES
ENS
FBI0
W2
G2
D2
B2
S2
AGC hold on or off
FREQUENCY
FUNCTION
Preliminary specification
disabled
10 MHz
enabled
1 MHz
2 MHz
4 MHz
ENRD
PG1
W1
D1
G1
B1
S1
TZA1000
I
+10 mA
+10 mA
+20 mA
bias(max)
0
ENREF
PG0
W0
D0
G0
B0
S0