SSI34P3216A [TI]
SSI34P3216A;
TEXAS INSTRUMENTS 
SSI 34P3216A
Read Preamp/Channel
for Tape Storage
June 1997
DESCRIPTION
FEATURES
The SSI 34P3216A is a high performance BiCMOS
single chip read channel IC that contains all the
functions needed for signal amplification and
qualification in tape storage applications, allowing for
both MR and thin film tape heads. Functional blocks
include the preamplifier,AGC, programmable filter, and
pulse detector. Programmable functions of the
SSI 34P3216A device are controlled through a
bi-directional serial port and banks of internal registers.
The SSI 34P3216A 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 34P3216A
supports a sleep mode for minimal power dissipation
in non-operational periods. The SSI 34P3216A
provides a low noise read path with selectable gains
of 50 V/V and 100 V/V, write current control, and data
protection circuitry. Power supply fault protection is
provided by disabling the write current generator during
power sequencing. A power down mode (Idle) is
provided to reduce power consumption to less than
20 mW. The SSI 34P3216Arequires only a +5 V power
supply and is available in a 48-lead TQFP package.
•
Fast attack/decay modes for rapid AGC
recovery
•
•
•
Programmable cutoff frequency of 0.4 to 4 MHz
Bi-directional serial port for register access
Register programmable power management
(Sleep mode <20 mW)
•
•
Low operating power (400 mW typical @ 5 V)
Serial port programmable gain, 100 V/V and
50 V/V
•
High performance
- Input noise = 1.2 nV/√Hz max
- Input capacitance = 19 pF max
- Write current range = 5-30 mApk, 5 bit DAC
- Head output voltage swing = 3 Vpk min
•
Designed for two terminal tape, MIG, or MR
heads
•
•
Power supply fault protection
MRBias current range = 4-20 mA, 6 bit DAC
PIN DIAGRAM
48 47 46 45 44 43 42 41 40 39 38 37
VNG
RX
1
36
35
34
33
32
31
30
29
28
27
26
25
VPC
CP
2
CN
DACOUT
BYP
3
VNR
4
RDO
VPR
5
HOLD
AIP
6
LEVEL
VRC
7
AIN
SDEN
SDATA
SCLK
RDX
8
MTP1
MTP2
9
10
11
12
WDI
VCC
RDY
13 14 15 16 17 18 19 20 21 22 23 24
CAUTION: Use handling procedures necessary
for a static sensitive component.
48-lead TQFP
06/30/97 - rev.
1
SSI 34P3216A
Read Preamp/Channel
for Tape Storage
BLOCK DIAGRAM
GND
VPC
VPR
VPG
VCC
VNC
VNR
FIP
FIN
VNG
GND
AON
AOP
RDO
DACOUT
MTP1
MTP2
RX
SDEN
SCLK
BYP
HOLD
SDATA
AIN
AIP
RDY
RDX
WDI
Vcc
FLT
CS
R/W
Inductive head
MR head
2
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