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參數(shù)資料
| 型號(hào)： | AT78C1505 |
| 廠商： | Atmel Corp. |
| 英文描述： | DVD/CD Read Preamplifier(DVD/CD可讀前置放大器) |
| 中文描述： | DVD / CD光碟讀取放大器（DVD / CD光碟可讀前置放大器） |
| 文件頁(yè)數(shù)： | 4/12頁(yè) |
| 文件大?。?/td> | 65K |
| 代理商： | AT78C1505 |
AT78C1505
4
Write mode is also provided, via the WRITE pin, which
reduces the internal feedback resistor to 450
. Input
current noise is less than 6pA/rtHz over the passband of
the amplifier.
Six differential outputs are provided and can be configured
in one of two ways. The output configuration is done via the
serial register (see REG1, BIT 4). One of the six outputs is
the sum of the ABCD inputs and is referred to as the RF
output. This output represents the readback data which is
processed by the following read channel. The RF output
must be AC coupled to the subsequent circuitry. The RF
output also is used to read ID data for DVD-RAM. In this
mode the outputs are configured as (A + B) - (C + D). This
alternate output configuration is selected by asserting the
IDSEL pin high.
Four of the remaining five outputs can be configured as A,
B, C and D outputs or as A + C, B + D, A + D and B + C.
Each of the channels has an extra gain of 2 compared to
the RF and TPP outputs. The partial sum outputs A + C
and B + D can be used for differential phase detection
tracking in the following read channel (DVD) as well as
astigmatic focus, while A + B and C + D can be used for
push-pull tracking, wobble detection and ID detection in the
subsequent read channel. Each differential output has a
low-impedance driver to drive the flex and read channel
circuitry. The sixth differential output is the signal (A + D) -
(B + C). This signal is used for the Tangential Push Pull
(TPP) operation.
EF and LPWR Slow-Speed SERVO AMPS
The EF amps are used to process servo information such
as 3-beam tracking for CD. Each photodetector input drives
a low-bandwidth (1MHz) transimpedance amplifier as
shown below.
Photodetector and Slow-Transimpedance Amplifier
Each amplifier also has a dedicated 6-bit offset DAC
controllable though the serial register. Input/Output bias
level for zero input current is set at 1.2V. Tables for TZ gain
and PGC are given below.
The maximum allowable current is 30
μ
A per diode under
normal read operating conditions (16.2K
TZ, 1 V/V PGC).
The outputs of these preamplifiers are all single ended.
3 to 15V
E
TransZ Amp
3R
TZ
_
+
offset DAC
6
1.2V
PGC
Table 4.
Servo TZ gain
TZEF<1>
TZEF<0>
TZ gain
0
0
11.8K
0
1
16.2K
1
0
46K
1
1
1.4K
Table 5.
Servo PGC gains
PGCEF<1>
PGCEF<0>
PGC gain
V/V
0
0
0.5
0
1
1
1
0
2
1
1
4
Table 6.
Offset
Setting
Output offset voltage
PGC 1V/V
(Scales with PGC)
Min
0
Max
-182mV
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