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| 型號： | BA7042 |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | VCO with sensitivity adjustment function |
| 中文描述： | 壓控振蕩器的靈敏度調(diào)整功能 |
| 文件頁數(shù)： | 4/5頁 |
| 文件大?。?/td> | 64K |
| 代理商： | BA7042 |
1
C (pF)
111
Optical disc ICs
BA7042
Circuit operation
(1)
Circuit configuration
The control voltage, input through pin 1, is amplified by
the control amplifier, then output to pin 7 and input to the
VCO control circuit. The oscillation frequency of the VCO
is determined by the attached capacitor and controlled
according to the control voltage. Highly modulated FM
signals can be produced by superimposing the control
voltage with AC signals.
(2)
Block description
(
1) Control amplifier (pin 1, pin 7, pin 8)
The differential amplifier’s positive input is pin 1, its nega-
tive input pin 8, and its output pin 7. Set the input bias volt-
age so that the pin 7 voltage is V
CC
/2. The amplification
degree is determined by the external constant.
(
2) VCO (pin 2, pin 3, pin 5)
The oscillator’s center frequency is set with an external
capacitor. Use the following equation to calculate oscilla-
tion frequency :
f
(1.3
V
7
0.15)
10
2
[MHz]
where C = C
2
C
3
, V
7
= pin 7 voltage
The oscillation frequency set by the capacitor is the cen-
ter frequency in the VCO’s frequency variation range.
The VCO can be given a roughly linear oscillation fre-
quency by changing its control voltage.
Operation notes
(1)
Temperature drift of the oscillator circuit can be re-
duced by configuring with a capacitor having a tempera-
ture coefficient. Temperature drift with a capacitor having
a temperature coefficient of zero is
C = 25pF, f
O
= 14.3MHz, V
CTL
= 2.5V.
30kHz / C when
(2)
depend on NF. When used as a reversing amplifier, cutoff
frequency is roughly 100kHz with a gain of 20dB. When
configuring PLL circuits, remember that loop stability is
affected by the amplifier’s frequency characteristics.
The control amplifier’s frequency characteristics
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