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參數(shù)資料
| 型號(hào)： | TZA1025 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Data amplifier and laser supply circuit for CD audio and video optical systems (ADALASLC)(應(yīng)用在CD音頻和視頻光學(xué)系統(tǒng)（ADALAS）中的數(shù)據(jù)放大器和激光電源電路) |
| 中文描述： | 數(shù)據(jù)放大器和激光CD音頻和視頻（ADALASLC）（應(yīng)用在光碟音頻和視頻光學(xué)系統(tǒng)（ADALAS）中的數(shù)據(jù)放大器和激光電源電路光學(xué)系統(tǒng)的電源電路） |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 122K |
| 代理商： | TZA1025 |
1998 Oct 30
4
Philips Semiconductors
Product specification
Data amplifier and laser supply circuit for CD
audio and video optical systems (ADALASLC)
TZA1025
PINNING
FUNCTIONAL DESCRIPTION
The TZA1025 consists of two sections, the RF amplifier
and the automatic laser power control circuit.
RF amplifier
The RF amplifier consists of a current input amplifier, an
equalizer/bandwidth section and a transimpedance output
amplifier with an external feedback resistor of 10 k
(fixed
value).
SYMBOL
PIN
DESCRIPTION
LD
V
DD(L)
CFIL
MON
DIN
GND
PWRON
CMFB
1
2
3
4
5
6
7
8
current output to laser diode
laser supply voltage
external filter capacitor
laser monitor diode input
central diode input
ground
power-on select input
common mode feedback voltage
input
external RF feedback resistor
RF amplifier output
gain select input for CD-A/V, CD-R/W
ground
supply voltage
external laser supply gain adjust
resistor
RFFB
RFEQO
CDRW
GND
V
DD
RGADJ
9
10
11
12
13
14
Fig.2 Pin configuration.
handbook, halfpage
MBK901
TZA1025
1
2
3
4
5
6
7
8
14
13
12
11
10
9
LD
VDD(L)
CFIL
MON
DIN
GND
PWRON
CMFB
RFFB
RFEQO
CDRW
GND
VDD
RGADJ
The gain of the RF amplifier can be adjusted by the
external input resistors. Fig.3 shows the simplified
schematic which can be used to determine the RF gain.
The signal is AC coupled to the RF amplifier. The formula
to determine the gain is shown below:
Z
)
R2
(1)
where:
G
RF
is the RF amplifier gain
n is the number of input resistors
Z
tr(RF)
is the transimpedance of the amplifier (
)
R2 is the value of the input resistors (
).
The gain can be increased by a factor of 4 by making
pin CDRW HIGH. The value of Z
tr(RF)
is 9.8 k
for CD-A/V
(CDRW = LOW) and 38 k
for CD-R/W (CDRW = HIGH).
An internal equalizer ensures an optimal performance.
The DC output level of the amplifier can be set by applying
a DC voltage on the common mode feedback pin CMFB.
Since the input signal is AC-coupled the RF output voltage
will swing (symmetrically) around this DC level.
The coupling of the TZA1025 to the signal processor
(SAA7325) can be either AC or DC. When an AC-coupling
is chosen (see Fig.6) the minimum supply voltage can be
applied. When a DC-coupling is chosen (see Fig.7) a
minimum supply voltage of 2.8 V is required.
G
RF
n
–
------------------
×
=
Fig.3 Simplified schematic.
handbook, halfpage
CDRW
RFEQO
C2
10 k
R2(1)
R2(2)
R2(n)
Vin
Vin
MGL530
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