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参数资料
| 型号： | TZA1025T |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 消费家电 |
| 英文描述： | Data amplifier and laser supply circuit for CD audio and video optical systems ADALASLC |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO14 |
| 文件页数： | 9/16页 |
| 文件大小： | 99K |
| 代理商： | TZA1025T |
1998 Oct 30
2
Philips Semiconductors
Product specication
Data amplier and laser supply circuit for CD
audio and video optical systems (ADALASLC)
TZA1025
FEATURES
Supports a wide range of voltage output mechanisms
RF amplifier designed for audio and video applications
with 1
× data rate
Programmable RF gain for CD-Audio/Video (CD-A/V)
and CD-Read/Write (CD-R/W) discs
Equalizer for optimal performance
Fully Automatic Laser Power Control (ALPC) including
stabilization plus a separate laser supply voltage for
power efficiency
Adjustable current range of ALPC output
Automatic N- or P-substrate monitor diode selection
Adjustable laser bandwidth and laser switch-on current
slope using external capacitor
Protection circuit to prevent laser damage due to laser
supply voltage dip
Optimized interconnection between data amplifier and
Philips’ digital signal processor CD10LC (SAA7325)
Wide supply voltage range
Power-down switch to reduce power consumption
during standby
Low power consumption.
GENERAL DESCRIPTION
The TZA1025 is a data amplifier and laser supply circuit for
voltage output mechanisms found in a wide range of audio
and video CD systems. The device contains an RF
amplifier and an automatic laser power control circuit.
The preamplifier forms an interface for voltage output CD
mechanisms to the Philips’ digital signal processor
CD10LC (SAA7325).
The RF bandwidth allows this device to be used in CD-A/V
applications with a data rate of n = 1 times speed. The RF
gain can be adapted for CD-A/V discs or CD-R/W discs by
means of the gain select signal.
The equalizer ensures an optimal performance.
The TZA1025 can be adapted to a wide range of voltage
output mechanisms by means of external resistors.
The ALPC circuit will maintain control over the laser diode
current. With an on-chip reference voltage generator, a
constant and stabilized output power is ensured
independent of ageing. The ALPC can accommodate
N- or P-substrate monitor diodes.
A separate supply voltage connection for the laser allows
the internal power dissipation to be reduced by connecting
a low voltage supply. The laser output current range can
be optimized to fit the requirements of the laser diode by
means of one external resistor. When a DC-to-DC
converter is used, in combination with the control loop of
the ALPC, the adjustable output current range provides
the possibility to compensate for the extra gain a DC-to-DC
converter introduces in the control loop.
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TZA1025T
SO14
plastic small outline package; 14 leads; body width 3.9 mm
SOT108-1
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| TZA1026 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Data amplifier and laser supply circuit for CD audio and video optical systems ADALASAuto |
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