TZA1000 Просмотр технического описания (PDF) - Philips Electronics
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TZA1000 Datasheet PDF : 24 Pages
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Philips Semiconductors
QIC read-write amplifier
Preliminary specification
TZA1000
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX. UNIT
Vhys(AGC)
hysteresis in AGC detection
level
65
75
85
mV
BAGC
fclk
AGC bandwidth
operational clock
note 5
−
1.5
−
MHz
0
24
24
MHz
Write section
Iwrite
write current
Rhead = 10 Ω;
27.3
28.8
30.3
mA
Rref = 430Ω;
0-peak; W = 32; note 6
Iwrite(max)
maximum write current
Rhead = 10 Ω; note 7 60
80
−
mA
∆Iwrite
difference between positive
and negative write currents
Iwrite = 30 mA;
−
0
5
%
tt(iwrite)(Rload)
write current transition time note 8
resistive load
resistive load, 10 Ω
−
4
−
ns
head load
Rhead = 10 Ω;
Lhead = 200 nH
−
6
12
ns
Vo(p-p)(1,3)
output voltage swing
(peak-to-peak value)
3
−
−
V
tR-W
tW-R
∆tWD
tWDIH
tWDIL
Rdet(WUS)
read to write time
write to read time
WD pulse asymmetry
WDI pulse time HIGH
WDI pulse time LOW
WUS detection
resistance level
−
0.2
−
µs
−
10
−
µs
in WDI mode; note 9 −
0
1
ns
5
−
−
ns
5
−
−
ns
short circuited to VDD or −
−
10
Ω
VSS; Iwrite = 30 mA
open; Iwrite = 30 mA
150
−
−
Ω
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
transfer.
6. W is a 7-bit number contained in control bits W0 to W6 (see Table 14). A more accurate calculation of the write
current would be given by: Ic = It − 0.003 × It2, where It = 125 (W + 1) / 128, It the target current and Ic the
write current.
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
16
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