Sony CXA3171N Datasheet
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E97305A7X-TE
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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.
4ch. Read/Write Amplifier for three terminal MIG Head of Hard Disk Drive
24 pin SSOP (Plastic)
CXA3171N
Description
The CXA3171N is a Read/Write Amplifier for the
special three terminal MIG head of hard disk drive
and designed to handle up to 4 channel heads.
Features
• Operate on single +5 V power supply
• Low power consumption
Read : 95 mW
Write : 115 mW + IW × 5
• Designed for special three terminal MIG heads
• Read amplifier emitter follower output featuring
420 times gain (typ).
• Differential input capacitance for Read : 6.7 pF (typ)
• Input noise : 0.46nV / √ Hz (typ)
• Differential Head voltage swing : 9 Vp-p (typ)
• Differential P-ECL write data input
• Built-in write unsafe detection circuit.
• Built-in Servo write function (2/4 ch).
• Built-in IC protection circuit for short of head and
GND.
• Read data outputs are high impedance in write
mode.
• Built-in supply voltage monitor circuit prohibits
incorrect write during power on or abnormal
voltage.
• Self switching damping resistance (RD=420 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 23 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 10 to 22 mAo-p
For the availability of this product, please contact the sales office.
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CXA3171N
H0X
H0C
H0Y
H1X
H1C
H1Y
H2X
H2C
H2Y
H3X
H3C
H3Y
WRITE
CURRENT
SOURCE
MODE
CONTROL
AMP
HEAD
SELECT
WRITE
UNSAFE
DETECTOR
POWER
ON/OFF
DETECTOR
IC
PROTECTOR
GND
R/W
WC
RDY
RDX
HS0
HS1
NC
WDX
WDY
WUS/SE
V
CC
DRIVER
AMP
DRIVER
AMP
AMP
AMP
DRIVER
DRIVER
1
2
3
4
5
6
7
8
9
10
11
12 13
21
22
24
23
20
17
18
19
16
15
14
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CXA3171N
Pin Description
No.
24
1
2
3
4
5
6
7
8
9
10
11
12
14
15
16
13
17
Symbol
GND
H0X
H0C
H0Y
H1X
H1C
H1Y
H2X
H2C
H2Y
H3X
H3C
H3Y
WUS/SE
WDY
WDX
VCC
NC
Equivalent circuit
1
3
5
7
9
11
2
4
6
8
10
12
2k 2k
VCC
GND
Description
Head.
4 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—
CXA3171N
No.
18
19
23
20
21
22
Symbol
HS1
HS0
R/W
RDX
RDY
WC
Equivalent circuit
VCC
GND
18
19
R
2.1V
HS0:R=78K, HS1:R=100K
VCC
GND
180k
2.1V
23
VCC
GND
21
20
2V
VCC
GND
22
Description
Head select signal input.
Selects one of 4 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—
CXA3171N
Electrical Characteristics (Unless otherwise specified, VCC=5 V, Ta=25 °C, Write current IW=20 mA)
No.
1-1
1-2
2-1
2-2
2-3
2-4
2-5
2-6
2-7
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
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
VWUS
IWUS
VTH
SW conditions
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
a a a a a a a a e b a a b a a b b
b b b b a a a a e b a a b a a b a
a a a a a a a a e b a a b a a b a
a a a a a a a a e b a a b b b b b
b b b b a a a a e b a a b a a a a
b b b b b a a a b b a c c a a b a
b b b b a a a a e b a a b a a b a
b b b b b a a a a b a a b a a b a
Measurement conditions
Test point : l
2
Test point : l2
Digital input :
Pins 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
12 19 28 mA
17 23 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
0.5 V
50 µA
3.4 3.9 4.3 V
—6—
CXA3171N
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
A
V
BW
EN
SW conditions
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
b b b b a a a a e b a a b a a a a
b b b b b a a a a b a a b a a b a
b b b b b a a a a b b a a a a b a
b b b b b a a a a b b a a a a b a
a a a a b a a a c b a a b a a b b
a a a a b a a a c b a a b a a b b
a a a a a a a a e b a a b a a b b
Measurement conditions
IW=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
10 22 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
355 420 485 V/V
100 140 MHz
nV
0.46 0.65
√ Hz
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