SSI34P3214 [TI]
SSI34P3214;
TEXAS INSTRUMENTS 
SSI 34P3214
Read Channel for High Density
Floppy and Disk/Tape Drives
Prototype
February 1998
DESCRIPTION
FEATURES
The SSI 34P3214 is a high performance BiCMOS
single chip read channel IC that contains all the
functions needed to implement zoned recording for
high density floppy disk drive and tape applications.
Functional blocks include the pulse detector,
programmable filter, servo demodulator, time base
generator, and data synchronizer. VCO range of
0.6 MHz to 13 MHz is selectable through the serial
port. Programmable functions of the SSI 34P3214
device are controlled through a bi-directional serial port
and banks of internal registers. This allows zoned
recording applications to be supported without
changing external component values from zone to
zone. The SSI 34P3214 utilizes an advanced BiCMOS
process technology along with advanced circuit design
techniques which result in a high performance device
with low power consumption. The SSI 34P3214
supports a sleep mode for minimal power dissipation
in non-operational periods. The SSI 34P3214 is
available in a 64-lead TQFP package.
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Complete zoned recording application support
VCO range: 0.6 MHz to 13 MHz selectable
through the serial port
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Supports 1,7 RLL, MFM, FM, and GCR encoding
format
Fast attack/decay modes for rapid AGC
recovery
Dual rate charge pump for fast transient
recovery
Programmable cutoff frequency of 0.4 to
4 MHz in data mode and servo mode
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Tracking threshold for rapid LEVEL discharge
Time base generator with better than 1%
frequency resolution
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Fast acquisition phase lock loop with zero
phase restart technique
Fully integrated data synchronizer with
programmable window shift control
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4-burst servo capture with A, B, C, D outputs
Bi-directional serial port for register access
Register programmable power management
(sleep mode <8 mW)
•
Separate settings for filter cut-off, filter boost,
AGC bypass capacitor and hysteresis
threshold for data mode and servo mode
•
Low operating power (400 mW typical @ 5 V)
02/23/98 - rev.
1
SSI 34P3214
Read Channel for High Density
Floppy and Disk/Tape Drives
BLOCK DIAGRAM
SDEN
SCLK
MUX
MUX
RDIO
SDATA
MAXREF
D
C
B
A
RRC
DFLT
DFLT
RESET
STROBE
SG
CP
CN
SDO
RR
RTH
DN
DP
FNN
FNP
FDN
FDP
TFLT
TFLT
FIP
FIN
AON
AOP
FREF
MUX
MUX
2
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