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CXA3188N
2ch. Read/Write Amplifier for Thin Film Head of Hard Disk Drive
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Description The CXA3188N is a Read/Write Amplifier for the thin film head of hard disk drive and designed to handle up to 2 channel heads. Features * Operate on single +5 V power supply * Low power consumption Read : 90 mW Write : 115 mW + IW x 5 Idle : 8 mW * Designed for two terminal thin-film or MIG heads. * Read amplifier emitter follower output featuring 200 times gain(typ). * Differential input capacitance for Read : 6pF (typ) * Input noise : 0.47 nV / Hz (typ) * Write current range : 10 to 20 mA * 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. * Read data outputs are high impedance in write mode. * Unselected head voltage is high impedance. * Self switching damping resistor 380 . * Built-in supply voltage monitor circuit prohibits incorrect write during power on or abnormal voltage. Function Read, Write and Write unsafe detection for HDD, power supply ON/OFF detection. Structure Bipolar silicon monolithic IC 16 pin SSOP (Plastic)
Absolute Maximum Ratings (Ta=25 C) * Supply voltage VCC 6 V * Operating temperature Topr -20 to +70 C * Storage temperature Tstg -55 to +150 C * Allowable power dissipation (on board) PD 760 mW * Write current IW 22 mA * WUS/SE pin input current ISEH 15 mA Operating Conditions Supply voltage
VCC
50.5
V
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by 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.
--1--
E98128-TE
CXA3188N
Block Diagram and Pin Configuration
GND
1
MODE CONTROL
16 XCS
H0X
2
DRIVER
15
R/W
H0Y
3
AMP
WRITE CURRENT SOURCE
14
WC
H1X
4
DRIVER AMP
13 RDY
H1Y
5
AMP
12 RDX
VCC
6
POWER ON/OFF DETECTOR
HEAD SELECT
11
HS
NC
7
WD BUF
10 WDX
WUS/SE
8
WRITE UNSAFE DETECTOR
9
WDY
--2--
CXA3188N
Pin Description No. 1 Symbol GND
VCC
Equivalent circuit
Description
2 3 4 5
H0X H0Y H1X H1Y
2 4 3 5
2k
2k
Head. 2 channels provided.
100k GND
6 7
VCC NC
VCC
5 V power supply.
8
WUS/SE
8
Write unsafe detection output / Servo Enable signal input.
GND
VCC
9 10
WDY WDX
9
10
Differential P-ECL write data input.
GND
--3--
CXA3188N
No.
Symbol
Equivalent circuit
VCC
Description
11
HS
11
Head select signal input. At "Low" : Head0 at "High" : Head1
180k 2.1V GND VCC
12 13
RDY RDX
12
Read amplifier output.
13
GND VCC
14
WC
14 2.5V GND
A setting resistor for the write current value is connected between this pin and GND.
VCC
180k
15
R/W
15
Read/Write signal input. At "High" : Read at "Low" : Write
2.1V GND
VCC
16
XCS
16
Power save signal input At "High" : Power saving.
100k 2.1V GND
--4--
CXA3188N
Electrical Characteristics Item Current consumption for read Current consumption for write Current consumption for idle Digital input "Low" input voltage Digital input "High" input voltage Digital input "Low" input current Digital input "High" input current Write data input current Write data input voltage range WD input amplitude Power supply ON/OFF detector threshold voltage Write current setting range Write current voltage Write current gain Write current setting constant Write unsafe output leak current Write unsafe output Low voltage WUS/SE input current WUS/SE High input voltage
(Unless otherwise specified, VCC=5 V, Ta=25 C, Write current IW=20 mA) Symbol ICCR ICCW ICCI VIL VIH IIL IIH IWD VWDV VWDA VTH IW VWC AW KW IWUS VWUSL ISEH VSEH Output current: 1 mA Servo write Enabled Servo write Enabled 5 VCC +1.5 IW=AW * VWC/RWC When write current is "Iw[mA]", IW=KW/RWC. (RWC=3.3 k) VCC-2.5 0.3 3.4 10 2.25 18 46 2.5 20 51 3.9 2.0 -100 100 50 VCC 1 4.3 20 2.75 22 56 50 0.5 14 VCC +1.6 A V mA V IW=20 mA Test condition Min. 11 14 +IW 1.1 Typ. 18 23 +IW 1.6 Max. 25 33 +IW 2.1 0.8 Unit. mA mA mA V V A A A V V V mAo-p V mA/mA
"H" applied voltage: 5 V "L" applied voltage: 0 V
--5--
CXA3188N
Item Read amplifier differential voltage gain
Symbol AV BW1
Test condition Input voltage:1 mVp-p,300 kHz load resistor: (RDX, RDY) 1 k Frequency at which Av lower by 1dB Frequency at which Av lower by 3dB Head impedance: 0 Common input voltage: 100 mVp-p, 20 MHz Ripple voltage: 100 mVp-p, 20 MHz Selected head input voltage: 0 mVp-p Unselected head input voltage: 100 mVp-p, 20 MHz
Min. 170 35 75
Typ. 200 60 120 0.47
Max. 230
Unit. V/V MHz MHz
Frequency band width BW2 Input referred noise voltage Common mode rejection ratio Supply voltage rejection ratio EN CMRR PSRR
0.65
nV Hz dB dB
50 50
Channel Separation
CS
50
dB
Read data output offset voltage for Read RDX, RDY common mode output voltage difference between modes RDX, RDY common mode output voltage for Read
VOFF Vdiff VRD CRD=0.1
-300 -300 VCC -2.3
300 300
mV mV V
--6--
CXA3188N
Unless otherwise specified, VCC=5 V, Ta=25 C, fWD (Write data frequency) =5 MHz, IW=15 mA, LH (Head inductance) =1 H, RH (Head DC resistance value) =30
Item Head differential voltage amplitude Mode switching time Read to Write
Symbol
Measurement conditions Differential voltage between HX pin and HY pin at switching of Write current TRW is the time required for Write current to turn
Min.
Typ.
Max.
Unit.
VSW
9
Vp-p
TRW
TWR1 Mode switching time Write to Read TWR2 Mode switching time Power saving to Read Mode switching time safe to unsafe Mode switching time unsafe to safe
TIR
TSA1
TSA2
Head switching time Write current propagation delay time Write current rise/fall time
TH
to 90 % after Pin 15 changes from "High" to "Low". TWR1 is the time required for the Read amplifier output to turn to 90 % after Pin 15 changes from "Low" to "High". TWR2 is the time required for Write current to decreases to 10 % after Pin 15 changes from "Low" to "High". TIR is the time required for the Read amplifier output to turn to 90 % after Pin 16 changes from "High" to "Low". TSA1 is the time required for Pin 8 to turn "High" after the last transition of Write data when Write data is stopped in Write mode. TSA2 is the time required for Pin 8 to turn "Low" after the first transition of Write data in Write mode. TH is the time required for the Read amplifier output to reach 90 % when the selected head switched in Read mode. TPD is the time required for Write current to reach 90 % after the Write data falling edge. TR is the time required for Write current to reach 90 % from 10 %; TF is the same time required to reach 10 % from 90 %. LH=0 H, RH=0
0.13
0.3
s
0.2
0.3
s
0.1
0.3
s
1
s
1.0
2.3
3.0
s
0.6
s
0.6
s
TPD
2
7
ns
TR/TF
1
3
ns
Read amplifier output 100 mVp-p 10 MHz
--7--
CXA3188N
Test Circuit 1
1k LPF x100
AMP
1k
V
to 15MHz
x1
V
AMP
PG 1 1
PG
5V PG
V
V
3V
4V
ab
abc
ab
ab
ab
abc abc
A
16
A
15 14
2.7k 13 12
A
11
A
10
A 9
1
2
3
4
5
6
7
8 A
abab
abab
V
a abcde abcde 5.1k 0.1 33 0.1 0.1 VCC 5V 1 a b b 6V
A
A
VCC 5V
Fig. 1 Test Circuit 2
1k x1
AMP
1k
1 PG PG RWC 2.7k 14 13 12
1 PG PG PG
16
15
11
10
9
1
2
3
4
5
6
7
8
5.1k
LH 1H
LH 1H
5V
1
Fig. 2 --8--
CXA3188N
Timing Chart 1
WDX WDY
R/W
50%
50%
PS
50%
TRW
TWR 2
90% IWX IWY 10%
90% 10% TWR1 TIR
RDX RDY
90%
90%
Fig. 3 Timing Chart 2
WDX WDY
TPD 90% 10% TR 90% 90% 10% TF TSA1
IWX IWY
WUS TSA2
50%
50%
Fig. 4 --9--
CXA3188N
Description of Functions Read amplifier This is a low noise amplifier for amplifying the signals from the heads with an emitter follower output. The RDX and RDY are the outputs of the differential amplifier, the X side of the head input and RDX pin and the Y side of the head inputs and RDY pin have the same polarity. Write circuit The Write data input to WDX pin and WDY pin passes through the buffer amp. It drives the Write switch circuit which supplies the Write current to the heads. The Write current flows into the X side when WDX is "Low" and WDY is "High". Mode control The mode are set as shown Table 1 by R/W and WUS/SE. CS R/W WUS/SE L L X L H X L L H X X Table 1. Mode selection
Mode Write Read Servo Write Power Save
Servo write mode This mode allows for writing to multiple channels at once. In this mode the write driver will drive all channels simultaneously. To enable servo write mode follow these steps: (1) Place the device in the Read mode. (2) Set WUS/SE to VSEH volts, or input ISEH to WUS/SE. (3) Initiate the write operation by setting R/W Low. Write unsafe detection circuit This circuit detects write errors. In normal Write mode, the WUS output is low; in the conditions listed below, it is high. * Head input is open (under the condition which RH= and Write data frequency is 10 MHz) * Head input is shorted to GND or VCC. * Write data frequency is abnormally low. * No Write current. * In read mode. * Supply voltage is abnormal (see "power supply ON/OFF detection"). Power supply ON/OFF detection This circuit monitors VCC to detect erroneous Writes. The error status is established when VCC falls below the threshold voltage (VTH) of the power supply ON/OFF detector, in which case the recording and playback functions are prohibited. When VCC rises above, VTH, the prohibition of these functions is released.
--10--
CXA3188N
Application Circuit
RWC 2.7k
1
1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
5.1k
LH
LH 1
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
--11--
CXA3188N
Notes on operation * This device handles high frequency and high gain signals. Please note the following; Connect VCC decoupling capacitor of approximately 1000 pF near the device. Make the GND area as large as possible. * The WC pin is a constant voltage pin. When noise affects this pin, it creates noise in Write current. Therefore, locate RWC as close to the device as possible. * Write unsafe detection circuit This circuit uses the voltage waveforms of the head pins for detection.
Wave form of write data
Voltage waveform of head pins (HX, HY)
VFB
VTH=1.4V VTH GND
VFB must be more than 2 V. When VFB < 2 V, it is possible that Write unsafe detection maximum frequency becomes more than 1 MHz. The normal operating area of write unsafe detection circuit is changed by head inductance, head DC resistance, write current and other.
--12--
CXA3188N
Application Notes Use the following characteristics for reference Item Differential output capacitance Differential output resistance Differential input capacitance Read mode Differential input resistance Output resistance Unselected head differential current at write mode Write mode Write current symmetry TAS=T1-T2 Symbol CO RD CI RI RRD IUS TASY Condition Between head input pins Between head input pins f=5MHz RDX or RDY, f=5MHz LH=2 H, RH=30 IW=15 mA LH=0 H, RH=0 IW=15 mA
VCC=5 V, Ta=25 C Min. Typ. Max. 4.5 380 6 1.2 45 6 490 10 60 Unit pF pF k
250 0.4
0.2 mAp-p -0.5 0.5 ns
IWX+IWY
50% T1
50% T2
50%
Setting of Write current Write current can be set with resistor RWC (k) at Pin 14. IW=K/RWC (mA) Refer to Fig. 5.
Write current vs. RWC
Write current setting constant vs. Write current
20
Write current setting constant kw
55
VCC=5V Ta=25C
Write current IW (mA)
52.5
10
50
5
47.5
45 10m 15m Write current IW (mA) 20m
2
5
10
20
RWC (k)
Fig. 5 --13--
Fig. 6
CXA3188N
Normalized read amplifier voltage gain vs. Supply voltage 1.04 Ta=25C 1.04
Normalized read amplifier voltage gain vs. Ambient temperature VCC=5V
AV/AV (Ta=25C)
1
AV/AV (Ta=25C)
5.0 5.5
1.02
1.02
1
0.98
0.98
0.96 4.0 4.5 6.0
0.96 -25 0 25 50 75
Supply voltage VCC (V)
Ambient temperature Ta (C)
Normalized write current vs. Supply voltage 1.04 Ta=25C RWC=24k 1.02
Normalized write current vs. Ambient temperature VCC=5V RWC=2.4k
1
IW/IW (Ta=25C)
5.0 5.5
IW/IW (VCC=5V)
1.02
1
0.98
0.96 4.0 4.5 6.0
0.98 -25 0 25 50 75
Supply voltage VCC (V)
Ambient temperature Ta (C)
--14--
CXA3188N
Input referred noise voltage vs. Supply voltage Ta=25C 0.49 0.55
Input referred noise voltage vs. Ambient temperature VCC=5V
EN (Ta=25C) (mV/ Hz)
EN (VCC=5V) (mV/ Hz)
4.0 4.5 5.0 5.5 6.0
0.5
0.47
0.45
0.45
0.4 -25 0 25 50 75
Supply voltage VCC (V) Power supply ON/OFF detector threshold voltage vs. Ambient temperature 4.0 OFF ON
Ambient temperature Ta (C)
Power supply ON/OFF detector Threshold Voltage (V)
3.9 ON OFF
3.8 -25 0 25 50 75
Ambient temperature Ta (C)
--15--
CXA3188N
Package Outline
Unit : mm
16PIN SSOP (PLASTIC)
5.0 0.1 + 0.2 1.25 - 0.1 0.1 16 9 A
4.4 0.1
1
8 0.65 + 0.05 0.15 - 0.02
+ 0.1 0.22 - 0.05
0.13 M 0.1 0.1
0 to 10 DETAIL A NOTE: Dimension "" does not include mold protrusion.
PACKAGE STRUCTURE
PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE SSOP-16P-L01 SSOP016-P-0044 LEAD TREATMENT LEAD MATERIAL PACKAGE MASS EPOXY RESIN SOLDER / PALLADIUM PLATING 42/COPPER ALLOY 0.1g
NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).
--16--
0.5 0.2
6.4 0.2

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