Sony CXA3170AN Datasheet
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E97640
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any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
6ch. Read/Write Amplifier for
Thin Film Head of Hard Disk Drive
24 pin SSOP (Plastic)
CXA3170AN
Description
The CXA3170AN is a Read/Write Amplifier for the
thin film head of hard disk drive and designed to
handle up to 6 channel heads.
Features
• Operate on single +5 V power supply
• Low power consumption
Read : 85 mW
Write : 115 mW + IW ×5
• Designed for two terminal thin-film or MIG heads
• Read amplifier emitter follower output featuring
360 times gain (typ).
• Differential input capacitance for Read : 6 pF (typ)
• Input noise : 0.47 nV / √ Hz (typ)
• Write current range : 5 to 15 mA
• Differential Head voltage swing : 9 Vp-p (typ)
• IW Rise / Fall times : 3.7 ns (typ)
(LH=540 nH, RH=25 Ω, IW=10 mA)
• Differential P-ECL write data input
• Built-in write unsafe detection circuit.
• Built-in Servo write function (3/6 ch).
• Built-in IC protection circuit for short of head and
GND.
• Read data outputs are high impedance in write
mode.
• Unselected head voltage is GND potential.
• Built-in supply voltage monitor circuit prohibits
incorrect write during power on or abnormal
voltage.
• Self switching damping resistance (RD = 360 Ω).
Function
Read, Write and Write unsafe detection for HDD,
power supply ON/OFF detection.
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings (Ta=25 °C)
• Supply voltage VCC 6V
•Write current IW 20 mAo-p
• Operating temperature Topr –20 to +75 °C
• Storage temperature Tstg –55 to +150 °C
• Allowable power dissipation
PD 800 mW
• WUS/SE pin input current
ISEH 15 mA
Recommended Operating Conditions
• Supply voltage VCC 5.0 V±10 %
• Write current IW 5 to 15 mAo-p
For the availability of this product, please contact the sales office.
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CXA3170AN
DRIVER
AMP
DRIVER
AMP
AMP
DRIVER
AMP
DRIVER
DRIVER
AMP
DRIVER
AMP
1
2
3
4
5
6
7
8
9
10
11
12
H0X
H0Y
H1X
H1Y
H2X
H2Y
H3X
H3Y
H4X
H4Y
H5X
H5Y
GND
R/W
WC
RDY
RDX
HS0
HS1
HS2
WDX
WDY
WUS/SE
V
CC
WRITE
CURRENT
SOURCE
MODE
CONTROL
AMP
HEAD
SELECT
WRITE
UNSAFE
DETECTOR
13
21
22
24
23
20
17
18
19
16
15
14
POWER
ON/OFF
DETECTOR
IC
PROTECTOR
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CXA3170AN
Pin Description
No.
24
1
2
3
4
5
6
7
8
9
10
11
12
14
15
16
13
Symbol
GND
H0X
H0Y
H1X
H1Y
H2X
H2Y
H3X
H3Y
H4X
H4Y
H5X
H5Y
WUS/SE
WDY
WDX
VCC
Equivalent circuit
1
3
5
7
9
11
2
4
6
8
10
12
2k 2k
VCC
GND
100K
Description
Head.
6 channels provided.
Write unsafe detection output /
Servo Enable signal input.
Differential P-ECL write data
input.
5 V power supply.
14
VCC
GND
16
VCC
GND
15
—4—
CXA3170AN
No.
17
18
19
23
20
21
22
Symbol
HS2
HS1
HS0
R/W
RDX
RDY
WC
Equivalent circuit
VCC
GND
17
18
19
100k
2.1V
VCC
GND
100k
2.1V
23
VCC
GND
21
20
VCC
GND
22
2.5V
Description
Head select signal input.
Selects one of 6 heads according
to Table 2.
Read/Write signal input
At “High” : Read,
at “Low” : Write.
Read Amplifier output.
A setting resistor for the write
current value is connected
between this pin and GND.
—5—
CXA3170AN
Electrical Characteristics (Unless otherwise specified, VCC=5 V, Ta=25 °C, Write current IW=15 mA)
No.
1-1
1-2
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
3-1
3-2
4
Item
Current consumption
for Read
Current consumption
for Write
Digital input “Low”
input voltage
Digital input “High”
input voltage
Digital input “Low”
input current
Digital input “High”
input current
Write data input
“Low” input voltage
Write data input
“High” input voltage
Write data
input current
Unselected
head voltage
Write unsafe output
saturation voltage
Write unsafe output
leak current
Supply power
ON/OFF detector
threshold voltage
Symbol
I
R
IWR
VIL
VIH
IIL
IIH
VWDL
VWDH
IWD
Vunsel
VWUS
IWUS
VTH
SW conditions
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
a a a a a a e b a a b a a a b b
a a a a a a e b a a b a a a b a
a a a a a a e b a a b a a a b a
a a a a a a e b a a b b b b b b
a a a a a a e b a a b a a a a a
b a a a a a b b a c c a a a b a
a a a a a a e b a a b a a a b a
b a a a a a a b a a b a a a b a
Measurement conditions
Test point : l
2
Test point : l2
Digital input :
Pins 17, 18, 19, 23
“High” applied voltage : 5 V
“Low” applied voltage : 0 V
Test point : l6, l7, l8, I9
Input voltage : 4 V
Output current : 1 mA
Test point : V1
Test point : l
3
When VCC is lowered from 5 V in
Write mode and IW does not flow
anymore, VCC voltage is set to
VTHOFF. When VCC is raised from
3 V and IW starts to flow, VCC
voltage is set to VTHON.
Min. Typ. Max. Unit
11 17 26 mA
16 22 36
mA
+IW +IW +IW
0.8 V
2.0 V
–100 µA
100 µA
VWDH VWDH
V
–2.0 –0.25
VCC VCC
V
–1.1 –0.4
50 µA
0.3 V
0.5 V
50 µA
3.4 3.9 4.3 V
—6—
CXA3170AN
No.
5-1
5-2
5-3
5-4
6-1
6-2
7
8
9
Item
Write current
setting range
Write current voltage
Write current gain
Write current
setting constant
WUS/SE voltage
WUS/SE sink current
Read amplifier
differential voltage
gain
Frequency band
width (–3 dB)
Input referred noise
Symbol
I
W
VWC
AW
KW
VSEH
ISEH
AV
BW
EN
SW conditions
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
a a a a a a e b a a b a a a a a
b a a a a a a b a a b a a a b a
b a a a a a a b b a a a a a b a
b a a a a a a b b a a a a a b a
b a a a a a c b a a b a a a b b
b a a a a a c b a a b a a a b b
a a a a a a e b a a b a a a b b
Measurement conditions
I
W=AW • VWC/RWC
IW=KW/RWC
Servo write enabled
Servo write enabled
Input voltage SG1 :
1 mVp-p, 300 kHz
Load resistance (RDX, RDY) :
1 kΩ
Test point : V4 [Vp-p]
AV =
V4
SG1
Frequency at which AV lowers
by 3 dB
Head impedance : 0 Ω,
when the read amplifier output
voltage is amplified 100 times
and voltage passed though a
LPF (low pass filter of cutoff
frequency 15 MHz) is VN [Vrms],
EN =
VN
100 • AV√ 15 × 10
6
Test point : V5
Min. Typ. Max. Unit
5 15 mAo-p
2.25 2.5 2.75 V
18 20 22
mA/mA
45 50 55
VCC VCC V
+1.5 +1.6
5 14 mA
305 360 415 V/V
100 140 MHz
nV
0.47 0.6
√ Hz
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