CXA3188N Просмотр технического описания (PDF) - Sony Semiconductor
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CXA3188N Datasheet PDF : 16 Pages
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CXA3188N
Description of Functions
Read amplifier
This is a low noise amplifier for amplifying the signals from the heads with an emitter follower output.
The RDX and RDY are the outputs of the differential amplifier, the X side of the head input and RDX pin and
the Y side of the head inputs and RDY pin have the same polarity.
Write circuit
The Write data input to WDX pin and WDY pin passes through the buffer amp. It drives the Write switch
circuit which supplies the Write current to the heads.
The Write current flows into the X side when WDX is “Low” and WDY is “High”.
Mode control
The mode are set as shown Table 1 by R/W and WUS/SE.
CS
R/W
WUS/SE
L
L
X
L
H
X
L
L
∗∗
H
X
X
Table 1. Mode selection
Mode
Write
Read
Servo Write
Power Save
Servo write mode ∗∗
This mode allows for writing to multiple channels at once. In this mode the write driver will drive all channels
simultaneously.
To enable servo write mode follow these steps:
(1) Place the device in the Read mode.
(2) Set WUS/SE to VSEH volts, or input ISEH to WUS/SE.
(3) Initiate the write operation by setting R/W Low.
Write unsafe detection circuit
This circuit detects write errors.
In normal Write mode, the WUS output is low; in the conditions listed below, it is high.
• Head input is open (under the condition which RH=∞ and Write data frequency is ≤ 10 MHz)
• Head input is shorted to GND or VCC.
• Write data frequency is abnormally low.
• No Write current.
• In read mode.
• Supply voltage is abnormal (see “power supply ON/OFF detection”).
Power supply ON/OFF detection
This circuit monitors VCC to detect erroneous Writes. The error status is established when VCC falls below the
threshold voltage (VTH) of the power supply ON/OFF detector, in which case the recording and playback
functions are prohibited. When VCC rises above, VTH, the prohibition of these functions is released.
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