tza1000 NXP Semiconductors, tza1000 Datasheet - Page 16

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

Philips Semiconductors
Notes
1. G is a 4-bit number contained in control bits G0 to G3 (see Table 12).
2. 6 dB step via a fixed setting, and 16 dB (in 1 dB steps) via AGC control.
3. S is a 7-bit number contained in control bits S0 to S6 (see Table 15).
4. The TZA1000 is guaranteed to operate reliably with sense currents of up to 33 mA.
5. The operational clock frequency (pin 15) must be >16 times higher the SCLK frequency to ensure reliable serial
6. W is a 7-bit number contained in control bits W0 to W6 (see Table 14). A more accurate calculation of the write
7. The TZA1000 is guaranteed to supply a write current of up to 60 mA.
8. 10 to 90% of a total current reversal.
9. Difference between negative-to-positive and positive-to-negative current slopes.
1998 Mar 17
V
B
f
Write section
I
I
t
V
t
t
t
t
R
clk
write
write(max)
t(iwrite)(Rload)
R-W
W-R
WDIH
WDIL
I
t
hys(AGC)
AGC
o(p-p)(1,3)
QIC read-write amplifier
det(WUS)
write
WD
transfer.
current would be given by: I
write current.
SYMBOL
hysteresis in AGC detection
level
AGC bandwidth
operational clock
difference between positive
and negative write currents
write current transition time
output voltage swing
(peak-to-peak value)
read to write time
write to read time
WD pulse asymmetry
WDI pulse time HIGH
WDI pulse time LOW
WUS detection
resistance level
write current
maximum write current
resistive load
head load
PARAMETER
c
= I
t
0.003 I
t
2
, where I
note 5
R
R
0-peak; W = 32; note 6
R
I
note 8
resistive load, 10
R
L
in WDI mode; note 9
short circuited to V
V
open; I
write
head
SS
head
ref
head
head
; I
= 430 ;
CONDITIONS
= 30 mA;
= 200 nH
write
t
= 10 ;
= 10 ; note 7
= 10 ;
16
= 125 (W + 1) / 128, I
write
= 30 mA
= 30 mA
DD
or
65
0
27.3
60
3
5
5
150
MIN.
t
the target current and I
75
1.5
24
28.8
80
0
4
6
0.2
10
0
TYP.
Preliminary specification
85
24
30.3
5
12
1
10
MAX.
TZA1000
c
the
mV
MHz
MHz
mA
mA
%
ns
ns
V
ns
ns
ns
UNIT
s
s