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TDA1302T 데이터시트(PDF) 8 Page - NXP Semiconductors

부품명 TDA1302T
상세설명  Data amplifier and laser supply circuit for CD player and read only optical systems
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제조업체  PHILIPS [NXP Semiconductors]
홈페이지  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

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TDA1302_1
9 Wed Sep 14 13:30:56 1994
September 1994
9
Philips Semiconductors
Preliminary specification
Data amplifier and laser supply circuit for
CD player and read only optical systems
TDA1302T
Notes to the characteristics
1. The maximum input current is defined as the current in which the gain reaches its minimum. Increasing the supply
voltage to VDD = 5 V increases the maximum input current (see also Figs 4 and 5).
2. The gain increases if a larger supply voltage is used (see also Fig.6).
3. Icsin is the sum of the diode input currents 1 to 4; Itsin is the sum of the diode input currents 5 and 6.
4. Transresistance 120 k
Ω means LOW gain, selected if HG = logic 0 (see Table 1).
5. Transresistance 240 k
Ω means HIGH gain, selected if HG = logic 1 (see Table 1).
6. Output voltage swing will be: VSRRF = VRFMO = VRFO(p-p).
7. Refers to equalized output only.
8.
For single speed the gain ratio is defined as gain difference between 1 MHz and 100 kHz, while the flatness delay
is defined up to 1 MHz (see also Fig.7). For double speed the gain ratio is defined as gain difference between 2 MHz
and 200 kHz, while the flatness delay is defined up to 2 MHz.
Transfer function
The equalized amplifier including Cext and Rext has the following transfer functions, where ‘rfe’ refers to equalized output
only and ‘rf’ refers to equalized and not equalized outputs.
FOR SINGLE SPEED (SP = LOGIC 1)
(1)
FOR DOUBLE SPEED (SP = LOGIC 0)
(2)
The denominator forms the denominator of a Bessel low-pass filter.
Table 2 Transresistance.
SYMBOL
DESCRIPTION
TYP.
UNIT
k
internally defined
4
ω
os1 = ωod2
internally defined
1.094
Q
internally defined
0.691
ω
od = 2 × ωos
internally defined
17.6
× 10−6
rad/s
RRF
see Chapter “Characteristics”
Rext
external resistor
750
Cext
external capacitor
47
pF
V
rfe
I
csin
----------
R
rf
1
ks
2
ω
2
os
1
1 Q
s
ω
os
s
2 ω2
os
+
×
+
------------------------------------------------------------------------
1
1
s
ω
1
+
-----------------------
1
1
sR
ext
C
ext
×
+
------------------------------------------
×
×
×
=
V
rfe
I
csin
----------
R
rf
1
ks
2
ω
2
os
1
1 Q
s
ω
od
s
2 ω2
od
+
×
+
-------------------------------------------------------------------------
1
1
sR
ext
C
ext
×
+
------------------------------------------
×
×
=


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