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參數(shù)資料
| 型號(hào)： | TLS21H62-3PW |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Read/Write Preamplifier(5V,2通道低噪讀寫前置運(yùn)放) |
| 中文描述： | 讀/寫前置放大器（5V的，2通道低噪讀寫前置運(yùn)放） |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大小： | 200K |
| 代理商： | TLS21H62-3PW |
TLS21H62-3PW
5-V THIN-FILM 2-CHANNEL LOW-NOISE READ/WRITE PREAMPLIFIER
SQHS015 – MAY 1996
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
read mode
Read mode is selected by taking CS low and R/W high. HS selects 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 driven and should be externally ac coupled to the load as shown
in Figure 2. 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 2. AC Load for RDX and RDY
idle mode
Idle mode is selected by taking CS high. The internal write-current generator and write-unsafe detector are
deactivated. The read outputs can be wire ORed and a single write-current programming resistor can be used
to select write current for a multiple-device application. This device is designed for low-power dissipation in the
idle mode.
fault detection
A voltage fault-detection circuit disables the write-current generator during power start-up or voltage fault in any
mode. WUS/SE goes high, indicating a fault, when any of the following conditions exist:
Write current is zero
Device is in read mode
Frequency on WDI is low
Device not selected
Head short to ground
Head open
Low V
CC
One positive transition on WDI is required to clear WUS/SE after all fault conditions are removed, except WDI
frequency. WDI frequency fault is cleared after detecting a safe frequency; therefore, at least one complete
period is required to clear this fault. Once the safe frequency is detected, one negative transition of WDI clears
this fault.
The head-open fault indicates that R
h
=
∞
and the write-data frequency is less than 10 MHz.
P
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TLS21H62-3PWR | 制造商:Texas Instruments 功能描述: |
| TLS21L62-3PWR | 制造商:Texas Instruments 功能描述: |
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