tza1000 NXP Semiconductors, tza1000 Datasheet - Page 2

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

Philips Semiconductors
FEATURES
QUICK REFERENCE DATA
1998 Mar 17
V
V
V
I
I
V
f
T
T
R
DD1
DD3
clk
SYMBOL
3-wire serial interface for programming
On-chip Digital-to-Analog Converters (DAC) for:
– MR (Magneto Resistive) sense bias current
– MR DC bias current
– Write current
Low noise differential input stage: typically 0.65 nV/ Hz
(Z
Magnetic feedback circuit to handle large output signals
MR DC bias current circuit
Very fast write current rise and fall times with near
rail-to-rail voltage swing
Maximum write current of 100 mA: ready for high
coercivity tape
Low noise read amplifier for reading track height servo
signals with the write coil
Very few external components required
On board registers for easy format or bit rate selection
Fast read-after-write recovery time
Test circuit for yoke-type heads
Switchable differentiator for yoke-type heads, with
programmable cut-off frequencies
Anti-aliasing low-pass filter, with programmable cut-off
frequencies
AGC (Automatic Gain Control) options: internally
(digitally) controlled, externally controlled or fixed gain
Hold input for fast AGC freeze
amb
j
DD1
DD2
DD3
n(i)(eq)
QIC read-write amplifier
th(j-a)
i
; I
= 0 )
DD2
read circuit supply voltage
FB and write circuit supply voltage
sense current circuit supply voltage
read/FB and write circuit supply current
sense current circuit supply current
equivalent input noise voltage
clock frequency
recommended operating temperature
recommended junction temperature
thermal resistance from junction to ambient
Read mode
Write mode
PARAMETER
2
I
I
Z
in free air
write
sense
CONDITIONS
RELATED DOCUMENTS
Both are available from Philips Semiconductors.
GENERAL DESCRIPTION
The TZA1000 is a single-chip read-write amplifier for
single-channel QIC (Quarter Inch Cartridge) systems with
MR heads. It can be used with both SIG (Sensor in Gap)-
and yoke-type MR heads and is designed to be used in
conjunction with the Philips SZA1000 digital equalizer IC
(although it can also function as a stand alone unit). This
combination is flexible enough to be used with all popular
tape backup formats including QIC 80, QIC 3010,
QIC 3020, QIC 3080, QIC 5010, Travan 1, Travan 2,
Travan 3 and Travan 4 and to be forward compatible with
their single channel successors.
source
Input for fast reader/writer (track height servo) signal
selection
Power fail detection on both 5 and 12 V lines (status can
be read from the read register)
Write unsafe detection
Provides an accurate reference voltage (for AD
conversion)
Very simple interconnection with the SZA1000 QIC
digital equalizer
+5 V 10% and +12 V 10% supply voltages
Low power standby, active and test modes.
SZA1000 QIC digital equalizer data sheet
Application notes for TZA1000 and SZA1000.
= 30 mA
= 16 mA
= 0
4.5
4.5
10.8
15.0
0
0
MIN.
5
5
12
69
105
16.2
0.65
66
TYP.
Preliminary specification
5.5
5.5
19.0
0.8
24
70
125
13.2
MAX.
TZA1000
V
V
V
mA
mA
mA
nV/ Hz
MHz
K/W
C
C
UNIT