SSI34R3437-PW [TI]
SSI34R3437-PW;
| 型号： | SSI34R3437-PW |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | SSI34R3437-PW |
| 文件： | 总2页 (文件大小：32K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SSI 34R3437-PW
5 V 2-Channel Write Coil
Driver with Read Buffer
Prototype
June 1998
DESCRIPTION
FEATURES
The SSI 34R3437-PW is a BiCMOS monolithic
integrated circuit that includes a read buffer amplifer
and a 2-channel, double pulse, write driver designed
to drive a transformer coupled ferrite head. The read
buffer amplifier is used to isolate the read channel
transformer termination impedance from the flex circuit
impedance and the read channel input circuitry. The
write driver is an adaptation of a conventional H-bridge
architecture, with additional circuitry that provides an
extra current pulse to decrease head field rise time.
The device requires +5 V and comes in a 20-Pin
VTSOP package.
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+5 V ± 10% supply
20-Pin VTSOP package
2-channel multiplexed write drivers
Read mode power = 96 mW (nom)
Write mode power = 433 mW (nom)
Sleep mode power = <5 µW (nom)
Head voltage swing = 4.2 V (min, open head)
PP
Rise/fall time of 2.7 ns 10-90% peak-peak
(nom, L = 164 nH, I = 42 mA peak, I = 21 mA
H
W
P
R
= 150 Ω)
DAMP
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External damping resistor (150 Ω)
(continued)
BLOCK DIAGRAM
2
2
RX,Y
RBX,Y
READ
BUFFER
CSP
HAN
READ/WRITE GATE
HEAD SELECT
RDN
HAX
HAY
MODE
CONTROL
PULSE
DELAY
WRITE DRIVER
PECL-CMOS
PECL-CMOS
2
2
2
WX,Y
PECL BUFFER
HBX
HBY
PULSE
DELAY
WRITE DRIVER
PECL-CMOS
PECL-CMOS
2
IPR
IWR
x1
x25
x50
IDR
REFERENCE CURRENT SWITCH
DELAY VOLTAGE
REFERENCE
06/02/98 - rev.
1
SSI 34R3437-PW
5 V 2-Channel Write Coil
Driver with Read Buffer
FEATURES (continued)
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External DAC programmable write current range
to 62.5 mA, current gain = 50
External DAC programmable pulse current range
to 31.3 mA, current gain = 25
Programmable pulse current delay by external
resistor; 2.0 V reference pin
Write driver “trickle” current for fast read to write
transitions = 200 ns (max)
Read buffer gain = 1 (nom), -3 dB bandwidth =
300 MHz (min)
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Equivalent input noise 10 nV√Hz (nom)
Supports requirements for DDS-4 tape standards
2
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