參數(shù)資料
型號(hào)： TLS2158
廠商： Texas Instruments, Inc.
英文描述： Low Noise Preamplifiers(單電源,8通道,低噪前置放大器)
中文描述： 低噪聲前置放大器（單電源，8通道，低噪前置放大器）
文件頁(yè)數(shù)： 19/25頁(yè)
文件大?。?/td> 523K
代理商： TLS2158
TLS2154, TLS2156, TLS2158
5-V THIN-FILM 4-, 6-, AND 8-CHANNEL
LOW-NOISE READ/WRITE PREAMPLIFIERS
SQHS006 – SEPTEMBER 1996
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
servo-write mode
Pulling WUS/SE above V
CC
and R/W low activates servo-write mode. This feature allows writing to all heads
at the same time. This allows the drive manufacturer to write all of the embedded servo patterns at once.
TLS2154 does not have any multiple-selected head servo function, but both the TLS2156 and the TLS2158
have this function by selecting HS0, HS1, and HS2. The combinations for the multiple-selected head servo
function are shown in Table 5.
Table 5. Multiple-Selected Head Servo Function
TLS2156
TLS2158
HS2
HS1
HS0
0, 1
0, 1
0
0
0
2, 3
2, 3
0
0
1
4, 5
4, 5
0
1
0
See Note 6
6, 7
0
1
1
0, 1, 2, 3
0, 1, 2, 3,
1
0
0
4, 5
4, 5, 6, 7
1
0
1
0, 1, 2, 3, 4, 5
0 – 7
1
1
0
0, 1, 2, 3, 4, 5
0 – 7
1
1
1
NOTE 6: No head is selected and RDX and RDY are Hi Z.
read mode
Read mode is selected by taking CS low and R/W high. The head select inputs HS0, HS1, and HS2 select the
appropriate head. In read mode, the device operates as a low-noise differential amplifier that deactivates the
write-current generator. The read-data outputs, RDX and RDY, are emitter-follower derived and should be
externally ac coupled to the load as illustrated in Figure 3. The read-mode recovery time is reduced by putting
RDX and RDY into high-impedance states during write and idle modes, maintaining the voltages on the ac
coupling capacitors. The damping resistor is isolated by diodes that effectively remove the resistor from the
circuit during the read mode.
RDX
RDY
C = 4700 pF
C = 4700 pF
R = 500
R = 500
Figure 3. AC Load for RDX and RDY
相關(guān)PDF資料
PDF描述
TLS2154 Low Noise Preamplifiers(單電源,4通道,低噪前置放大器)
TLS2156 Low Noise Preamplifiers(單電源,6通道,低噪前置放大器)
TLS21H62-3PW Read/Write Preamplifier(5V,2通道低噪讀寫(xiě)前置運(yùn)放)
TLS2230 Servo-Combination Predriver(伺服-組合預(yù)驅(qū)動(dòng)器)
TLS24302 Magnetoresistive/Thin-Film Read/Write Preamplifiers(2通道磁阻/薄膜讀/寫(xiě)用前置放大器)
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