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SL6270C の電気的特性と機能

SL6270CのメーカーはGEC Plessey Semiconductorsです、この部品の機能は「Gain Controlled Microphone Preamplifier / Vogad」です。


製品の詳細 ( Datasheet PDF )

部品番号
SL6270C
部品説明
Gain Controlled Microphone Preamplifier / Vogad
メーカ
GEC Plessey Semiconductors
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GEC Plessey Semiconductors ロゴ 




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SL6270C Datasheet, SL6270C PDF,ピン配置, 機能
THIS DOCUMENT IS FOR MAINTENANCE
PURPOSES ONLY AND IS NOT
RECOMMENDED FOR NEW DESIGNS

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SL6270C pdf, ピン配列
SL6270C
ELECTRICAL CHARACTERISTICS
Test conditions (unless otherwise stated):
Supply voltage Vcc: 6V
Input signal frequency: 1kHz
Ambient temperature: -30°C to +85°C
Test circuit shown in Fig. 4
Characteristics
Min.
Value
Typ.
Supply current
Input impedance
Differential impedance
Voltage gain
Output level
THD
Equivalent noise input voltage
40
55
5
150
300
52
90
2
1
Max.
Units
Conditions
10 mA
Pin 4 or 5
dB 72µV rms input pin 4
140 mV rms 4MV rms input pin 4
5 % 90mV rms input pin 4
µV 300source, 400Hz to 25kHz bandwidth
+6V
2.2µ
18
27
36
45
4.7n
OUTPUT
(1k MIN LOAD)
10µ
47µ
1M
INPUT
100n
INPUT
22k
N.B. If input not AC coupled the resistance
between pins 4 and 5 must be less than 10 ohms.
Fig. 4 SL6270 test and application circuit
APPLICATION NOTES
Voltage gain
The input to the SL6270 may be single ended or
differential but must be capacitor coupled. In the single-ended
mode the signal can be applied to either input, the remaining
input being decoupled to ground. Input signals of less than a
few hundred microvolts rms are amplified normally but as the
input level is increased the AGC begins to take effect and the
output is held almost constant at 90mV rms over an input
range of 50dB.
The dynamic range and sensitivity can be reduced by
reducing the main amplifier voltage gain. The connection of a
lk resistor between pins 7 and 8 will reduce both by
approximately 20dB. Values less than 680are not advised.
Frequency response
The low frequency response of the SL6270 is determined
by the input, output and coupling capacitors. Normally the
coupling capacitor between pins 2 and 7 is chosen to give a
-3dB point at 300Hz, corresponding to 2.2,µF, and the other
capacitors are chosen to give a response to 100Hz or less.
EXTERNAL
2.2µ
680
EXTERNAL
4.7n
10k
8
2
Voltage gain =
7
10k
680
Upper frequency response 10k/4.7nk = 3kHz
Lower frequency response 680/2.2µF = 300Hz
Fig. 5 SL6270 frequency response
The SL6270 has an open loop upper frequency response
of a few MHz and a capacitor should be connected between
pins 7 and 8 to give the required bandwidth.
Attack and delay times
Normally the SL6270 is required to respond quickly by
holding the output level almost constant as the input is
increased. This ‘attack time’, the time taken for the output to
return to within 10% of the original level following a 20dB
increase in input level, will be approximately 20ms with the
circuit of Fig.4. It is determined by the value of the capacitor
connected between pin 1 and ground and can be calculated
approximately from the formula:
Attack time = 0.4ms/µF
The decay time is determined by the discharge rate of
the capacitor and the recommended circuit gives a decay rate
of 20dB/second. Other values of resistance between pin 1 and
ground can be used to obtain different results.


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[ SL6270C データシート.PDF ]

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部品番号部品説明メーカ
SL6270C

Gain Controlled Microphone Preamplifier / Vogad

GEC Plessey Semiconductors
GEC Plessey Semiconductors

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