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U4083B Datasheet(PDF) 2 Page - TEMIC Semiconductors

Part # U4083B
Description  Low-Power Audio Amplifier for Telephone Applications
Download  11 Pages
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Manufacturer  TEMIC [TEMIC Semiconductors]
Direct Link  http://www.temic.de
Logo TEMIC - TEMIC Semiconductors

U4083B Datasheet(HTML) 2 Page - TEMIC Semiconductors

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U4083B
TELEFUNKEN Semiconductors
Rev. A2, 07-Apr-97
Preliminary Information
2 (11)
Pin Description
1
2
3
4
8
7
6
5
94 8022
V i
FC1
FC2
GND
CD
VO1
VO2
V S
Figure 2. Pinning
Pin
Symbol
Function
1
CD
Chip disable
2
FC2
Filtering, power supply rejection
3
FC1
Filtering, power supply rejection
4
Vi
Amplifier input
5
VO1
Amplifier output 1
6
VS
Voltage supply
7
GND
Ground
8
VO2
Amplifier output 2
Functional Description
Including External Circuitry
Pin 1: Chip disable
* digital input (CD)
Pin 1 (chip disable) is used to power down the IC to con-
serve power or muting or both.
Input impedance at pin 1 is typically 90 k
W.
Logic 0 < 0.8 V
IC enabled (normal operation)
Logic 1 > 2 V
IC disabled
Figure 15 shows power supply current diagram. The
change in differential gain from normal operation to
muted operation (muting) is more than 70 dB.
Switching characteristics are as follows:
turn-on time
ton = 12 to 15 ms
turn-off time
toff
v 2 ms
They are independent of C1, C2 and VS.
Voltages at Pins 2 and 3 are supplied from VS and there-
fore do not change when the U4083B is disabled.
Outputs– VO1 (Pin 5) and VO2 (Pin 8) –turn to a high im-
pedance condition by removing the signal from the
speaker.
When signals are applied from an external source to the
outputs (disabled), they must not exceed the range be-
tween the supply voltage, Vs, and Ground.
Pins 2 and 3: Filtering, power supply rejection
Power supply rejection is provided by capacitors C1 and
C2 at Pin 3 and Pin 2, respectively. C1 is dominant at high
frequencies whereas C2 is dominant at low frequencies
(figures 4 to 7). Values of C1 and C2 depend on the
conditions of each application. For example, a line
powered speakerphone (telephone amplifier) will require
more filtering than a system powered by regulated power
supply.
The amount of rejection is a function of the capacitors and
the equivalent impedance looking into Pin 3 and Pin 2
(see electrical characteristic equivalent resistance, R).
Apart from filtering, capacitors C1 and C2 also influence
the turn-on time of the circuit at power-up since capaci-
tors are charged up through the internal resistors (50 k
W
and 125 k
W) as shown in the block diagram.
Figure 1 shows turn-on time versus C2 at VS = 6 V, for two
different C1 values.
Turn-on time is 60% longer when VS = 3 V and 20%
shorter when VS = 9 V.
Turn-off time is less than 10
ms
Pin 4: Amplifier input
Vi
Pin 5: Amplifier output 1 VO1
Pin 8: Amplifier output 2 VO2
There are two identical operational amplifiers. Amp.1 has
an open loop gain
w 80 dB at 100 Hz (figure 2), whereas
the closed loop gain is set by external resistors, Rf and Ri
(figure 3). The amplifier is unity gain stable, and has a
unity gain frequency of approximately 1.5 MHz. A closed
loop gain of 46 dB is recommended for a frequency range
of 300 to 3400 Hz (voice band). Amp.2 is internally set
to a gain of –1.0 (0 dB). The outputs of both amplifiers are
capable of sourcing and sinking a peak current of 200 mA.
Output voltage swing is between 0.4 V and Vs – 1.3 V at
maximum current (figures 18 and 19).
The output dc offset voltage between Pins 5 and 8 (VO1
– VO2) is mainly a function of the feedback resistor, Rf,
because the input offset voltage of the two amplifiers
generally neutralize each other.
Bias current of Amp. 1 which is constant with respect to
Vs, however flows out of Pin 4 (Vi) and through Rf,
forcing V01 to shift negative by an amount equal to Rf IIB
and VO2 positive to an equal amount.
The output offset voltage specified in the electrical char-
acteristics is measured with the feedback resistor
(Rf = 75 k
W) shown in typical application circuit. It takes
into account bias current as well as internal offset voltages
of the amplifiers.


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