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参数资料
| 型号： | TZA1020HP |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 光电元器件 |
| 英文描述： | Pre-amplifiers for CD-RW systems |
| 中文描述： | 1 CHANNEL READ WRITE AMPLIFIER CIRCUIT, PQFP44 |
| 封装： | PLASTIC, QFP-44 |
| 文件页数： | 34/36页 |
| 文件大小： | 153K |
| 代理商： | TZA1020HP |
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2000 Oct 30
7
Philips Semiconductors
Product specication
Pre-ampliers for CD-RW systems
TZA1020; TZA1020A
7
FUNCTIONAL DESCRIPTION
All functions are designed in such a way that a read speed
up to twelve times nominal speed is possible
(N = 1, 2, 4, 8 or 12). Recording speed up to four is
possible (N = 1, 2 or 4). The maximum recording speed
must be determined.
7.1
Data amplier
The central diodes currents (C1 to C4) are fed to a high
bandwidth current amplifier. The gain of the current
amplifier can be switched by means of the I2C-bus
microcontroller interface to compensate for differences in
CD-R and CD-RW disc reflection. Data signals up to
twelve times nominal data speed can be read.
7.2
Normalizer
The currents from the central diodes (C1 to C4), the
current from the satellite diodes (SA1, SA2, SB1 and SB2)
and the laser set-point current (CAGAIN) are (optionally
sampled) fed to the first low-pass filters with a bandwidth
of 60 kHz. The normalizing circuit generates error signals
for servo control that are independent of the diode current
level. The gain of the error signals is controlled by the
I2C-bus microcontroller interface. A dropout concealment
becomes active if the input current level is below a certain
threshold value. This threshold value is also controlled by
the I2C-bus.
7.3
Wobble pre-processor
The wobble signal of the pre-groove is detected by means
of the PPN signal. The currents from inputs C1 to C4 are
filtered and processed to provide optimal signal-to-noise
ratio. The bandwidth of the filter may be adapted to the
disc speed via the I2C-bus. The bandwidth of a noise
reduction loop is controlled by an external capacitor, the
I2C-bus interface controls the total operation of the
processor.
7.4
Beta detector
The beta detector generates signals necessary for the
symmetry detection of the HF signal. By measuring peak
values (A1 and A2) and average value of the signal
(CALF), an optimum laser writing power can be
determined. The gain of the measured values is controlled
by the I2C-bus. The time constant of the peak detectors
and bandwidth of the low-pass filtered aperture signal can
also be adapted to the disc speed by the I2C-bus.
7.5
Alpha detector
The alpha detector determines a parameter called ‘alpha’
during disc writing. Alpha must be kept constant to allow
recording over a fingerprint or black dot. The definition of
alpha is different for CD-R and CD-RW; for CD-R the light
absorption of the disc is measured, for CD-RW alpha is
determined by actual laser power and disc reflection. The
gain of the measured signals and the CD-R and CD-RW
selection is performed by the I2C-bus.
7.6
Fast track count
The fast track count circuit generates a Radial Error (RE)
signal for fast track counting. A gain switch compensates
for difference in CD-R and CD-RW disc reflection.
7.7
Spot position measurement
To allow alignment of photo diodes via the TZA1020, a
number of linear combinations of input currents can be
realized (MEAS1 and MEAS2). Selection of the actual
combination is performed by the I2C-bus.
相关PDF资料 |
PDF描述 |
|---|---|
| TZA1020 | Pre-amplifiers for CD-RW systems |
| TZA1020A | Pre-amplifiers for CD-RW systems |
| TZA1024T | Data amplifier and laser supply circuit for CD audio and video optical systems ADALAS |
| TZA1025T | Data amplifier and laser supply circuit for CD audio and video optical systems ADALASLC |
| TZA1026T | Data amplifier and laser supply circuit for CD audio and video optical systems ADALASAuto |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TZA1020HP/A | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Pre-amplifiers for CD-RW systems |
| TZA1022 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Preamplifier and laser supply for CD/CDRW read-only optical systems (TRICINTA) |
| TZA1024 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:The TZA1024 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. |
| TZA1024T | 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 ADALAS |
| TZA1025 | 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 ADALASLC |
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