LD3600-XX
4, 6, 8, up to 16-Channel
+5V, -5V, MR Head Preamplifier
Samples Available
version 1.0
DESCRIPTION
The LD3600-XX is a BICMOS monolithic
integrated circuit designed for use with four-terminal
Magneto-Resistive recording heads. The reader
architecture is MR current bias/voltage sense and
will support user data rates of up to 225 Mbit/sec. A
bi-directional serial port is provided to enable the
implementation of on-chip MR bias and Write
current DACs. The device provides a write driver,
low noise read amplifier, serial port controlled head
selection, servo bank write, write current, MR read
bias current, and read and write fault detection
circuitry for up to ten channels. In a servo write
servo mode, 5 or 10 channels can be selected at one
time. The device requires +5V and -5V and comes in
a 100-pin TQFP package or flip-chip die form.
FEATURES
Ø +5V, -5V power supplies
Ø Designed for four-terminal MR heads with
minimum external components
Ø Truly differential current bias / voltage sense
MR read Amp
Ø MR head bias current range = 4 - 14 mA
Ø MR read gain = 220 V/V (nom)
Ø MR read input noise .75 nV / rt. Hz (nom)
Ø MR read input resistance = 300 Ohm (nom)
Ø Differential PECL write data input
Ø Head voltage swing = 12 Vp-p (nom)
Ø Write current range = 12.5 - 50 mA
Ø Read and Write unsafe detection
Ø Enhanced system write to read and read to write
recovery time
Ø Power supply fault protection
Ø Serial port controls head selection, write current,
MR read bias current
VCC
VEE
GND
VEE_R
SDEN
SCLK
SDATA
SERIAL
PORT
4-BIT DAC
READ
CURRENT
MODE
CONTROL
4-BIT DAC
WRITE
CURRENT
MR
BIAS
AMP
FASTB
CSB
BE
R/W
VREF
AMP
WRITE
UNSAFE
DETECTOR
VOLTAGE
FAULT
DETECTOR
BHV
MONITOR
RDX
RDY
READ
PREAMPS /
MR BIAS
AND WRITE
DRIVERS
HUS BHV CX4 CX3
WDX
WDY
CN CX1 CX2
CNR
C1
FOR CHANNELS
0, 1, 2, 3, 4
CN
C2
FOR CHANNELS
5, 6, 7, 8, 9
HR0X
HR0Y
HW0X
HW0Y
HR9X
HR9Y
HW9X
HW9Y
POWER
MANAGEMENT
