TA8496FL
Toshiba Bipolar Linear Integrated Circuit Silicon Monolithic
TA8496FL
Magnetic Head R/W IC
This IC enables writing and detection of magnetic recording
signals.
Features
•
•
•
Operating voltage range: V
CC
= 3.5 to 7 V
V
BAT
= 1.8 to 7 V
Output current: I
out
= 20 mA (max)
Constant current operating function
: I
OC
= (0.25 (V) × 160 (A))/R
WR
(typ.)
Weight: 0.05 g (typ.)
Block Diagram
V
CC
9
HDFB HDOUT
19
18
10 kΩ
100
Ω
V
CC
−
V
F
−
0.3 V
30 kΩ 30 kΩ
V
REF
24
COMIN 8
40 dB
HEAD-AMP
20 dB
AMP2
AMP3
21 AHDIN
20 ACOM
COM-AMP
2 V
BAT
ON/OFF 7
Control circuit
R/W 6
ENA 5
H-SW control circuit
CLK 4
22 HDIN
23 COM
AIN2
17
10 kΩ
T1
16
100 kΩ
10 kΩ
20 dB
30 dB
13 AOUT3
FCNT
12
AOUT2
15
100 kΩ
AIN3
14
10 kΩ
316 kΩ
CFIL 10
Filter
3
WRCNT
1
WRGND
11
RDGND
1
2003-10-07
TA8496FL
Pin Function
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Symbol
WRGND
V
BAT
WRCNT
CLK
ENA
R/W
ON/OFF
COMIN
V
CC
CFIL
RDGND
FCNT
AOUT3
AIN3
AOUT2
T1
AIN2
HDOUT
HDFB
ACOM
AHDIN
HDIN
COM
V
ref
GND for write block
High-switch control power supply
Write output setting pin
High-switch operation control signal input
High-switch enable signal input
Read/write select signal input
Chip enable signal input
Internal reference voltage setting
(fine adjustment)
Power supply input pin
Power supply filter connecting pin (C
=
0.1
µF)
GND for read block
Cut-off frequency setting pin
Amp 3 output
Amp 3 input
Amp 2 output
Amp 2 test pin
Amp 2 input
Head amp output
Head amp feedback input
COM amp output
Head amp output
Write output
Write output
V
CC
filter output (internal power supply)
Description
Maximum Rating
(Ta
=
25°C)
Characteristics
Power Supply Voltage
Input Voltage
Output Current
Operating Temperature
Storage Temperature
Symbol
V
CC
V
BAT
V
I
I
OUT
T
opr
T
stg
Rating
8
8
6
20
−20
to 70
−50
to 150
Unit
V
V
V
mA
°C
°C
Recommended Operating Conditions
Characteristics
Power Supply Voltage
Symbol
V
CC
V
BAT
Rating
3.5 to 7.0
1.8 to 7.0
Unit
V
2
2003-10-07
TA8496FL
Functions
Input
ON/OFF
R/W
H
L
H
L
L
L
L
H/L
ENA
H/L
H
H
L
L
H/L
CLK
H/L
H
L
L
H
H/L
COM
∞
L
H
L
∞
∞
Write Unit
HDin
∞
H
L
L
∞
∞
Enable
Disable
Disable
Disable
Disable
Disable
Read Unit
∞:
High impedance
Electrical Characteristics
Interface Block
(unless otherwise is specified, V
CC
=
5 V, V
BAT
=
3 V, Ta
=
25°C)
°
Characteristics
Symbol
V
IN1-Hi
Input Voltage
V
IN1-Lo
V
IN2-Hi
V
IN2-Lo
I
IN1-Hi
I
IN1-Lo
Input Current
I
IN2-Hi
I
IN3-Hi
I
IN3-Lo
I
IN4-Hi
1
Test
Circuit
Test Condition
ENA, ON/OFF
ENA, ON/OFF
CLK, R/W
CLK, R/W
CLK, V
IN
=
5 V
CLK, V
IN
=
0 V
ENA, V
IN
=
5 V
R/W, V
IN
=
5 V
R/W, V
IN
=
0 V
ON/OFF, V
IN
=
5 V
Min
2.5
1.5
―
Typ.
15
−85
85
15
−85
85
Max
V
CC
1.0
V
CC
0.5
25
−120
120
25
−120
120
µA
V
Unit
3
2003-10-07
TA8496FL
Read Block
(unless otherwise is specified, V
CC
=
5 V, V
BAT
=
3 V, Ta
=
25°C)
°
Characteristics
Symbol
I
CCR
Current Dissipation
I
CCO
Head amp
Gain
Characteristics
Amp 2
Amp 3
Head Amp Input Conversion Noise
Reference Voltage
Head amp
Output Offset
Voltage
Amp 2
Amp 3
Amp 3 Output
Voltage Range
Amp 3 Output
Current
Low
High
Output
Input
G
H
G
2
G
3
E
n1
E
n2
V
ACOM
V
HOS
V
2OS
V
3OS
V
3OL
V
3OH
I
3OUT
I
3IN
4
4
R
L
=
10 kΩ
3
3
―
3
2
Test
Circuit
Test Condition
When read block in operation
When chip disabled
(on/off
=
low or open)
R
g
=
0
Ω,
f
c
=
19 kHz
R
g
=
0
Ω,
f
c
=
1.7 kHz
Min
1.9
2.0
0.1
Typ.
3.2
0
40
40
30
0.33
0.15
2.0
−0.1
+0.7
+0.1
0.2
4.1
0.2
Max
4.6
1
(0.64)*
(0.26)*
2.1
±0.25
±1.1
±0.25
0.3
V
V
µV
rms
V
dB
Unit
mA
µA
mA
*:
Guaranteed by design. Determined at design and does not change at manufacturing. Test not conducted.
Write Block
(unless otherwise is specified, V
CC
=
5 V, V
BAT
=
3 V, Ta
=
25°C)
°
Characteristics
Symbol
I
CCw
I
CCe
I
CCB
I
bat
I
baB
I
bar
I
bao
Test
Circuit
Test Condition
During write, CLK
=
Low/High
When write enabled
When write in break
During write, reactive current
Current Dissipation
2
(R
WR
=
5 kΩ)
When write in break
During read
When chip disabled
(on/off
=
low or open)
5
I
OC
=
10 mA
(at V
BAT
=
2.0 V)
0 to 10%
0 to 90%
6
0 to 10%
0 to 90%
0 to 10%
0 to 90%
6
0 to 10%
0 to 90%
(Note1)
(Note1)
(Note1)
(Note1)
(Note1)
(Note1)
V
BAT
=
2.0 V
V
BAT
=
5.0 V
(Note1)
(Note1)
Min
8
Typ.
3.7
1.9
4.4
1.4
1.0
0
0
10
11
0.1
0.5
0.1
0.5
0.3
0.5
0.3
0.5
Max
5.2
2.8
6.1
1.8
1.6
1
µA
1
12
mA
13
µs
µs
mA
Unit
Set Output Current
I
OC
T
pLH1
CLK Output Transfer Time
T
pLH2
T
pHL1
T
pHL2
T
pZH1
ENA Output Transfer Time
T
pZH2
T
pHZ1
T
pHZ2
Note 1: Load RL
=
36
Ω,
CL
=
10 pF
4
2003-10-07
TA8496FL
Input/Output Circuit
•
CLK pin
V
REF
50 kΩ
1 kΩ
CLK 4
1.0 V
•
ENA pin
V
REF
50 kΩ
ENA 5
50 kΩ
•
R/W pin
V
REF
1 kΩ
R/W 6
1.0 V
GND
50 kΩ
GND
GND
•
ON/OFF pin
V
REF
•
AOUT3 pin
V
CC
GND
50 kΩ
ON/OFF 7
GND
Secondly L.P.F characteristics (amp 2)
30
Cut-off frequency (kHz)
(−3 dB)
10
3
1
0.3
0.1
1
200
µA
50 kΩ
13 AOUT3
3
10
30
100
Control resistance (kΩ)
(FCNT)
5
2003-10-07
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