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U4080B PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 U4080B
기능 Voice-Switched Circuit for Handsfree Operation
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U4080B 데이터시트, 핀배열, 회로
U4080B
Voice-Switched Circuit for Handsfree Operation
Description
The voice switched speakerphone integrated circuit,
U4080B, incorporates a variety of functions (see below).
The versality of the device is further enhanced by the
provision of a large number of pins giving access to
internal circuit points.
Features
D Operates on telephone lines, integrated reference
voltage regulation
D Output power: 100 mW at a 25-load with peak
limitation
D Chip select pin for active/standby operation
D Linear volume control
D Monitoring system for background sound level
D Wide operating dynamic range through signal
compression
Block Diagram / Application Circuit
Figure 1. Block diagram and application circuit
TELEFUNKEN Semiconductors
Rev. A1, 20-May-96
Preliminary Information
1 (15)




U4080B pdf, 반도체, 판매, 대치품
U4080B
Electrical Characteristics
V16 = + 7.5 V, V18 = 0.7 V, figure 1, Tamb = 25°C, unless other specified
Parameters
Test Conditions / Pins Symbol Min. Typ. Max. Unit
Supply voltages
Supply current
V16 = 11 V, V18 = 0.7 V
V16 = 11 V, V18 = 1.6 V
Regulated output voltage
x xLine regulation (deviation)
6.5 V VI 11 V
Output resistance
ICC = 3 mA
Dropout voltage
Pin 16 I+
9.0 mA
Pin 16 I+
800
Pin 20 VCC
4.9
5.4
5.9
V
DVCC
65 150 mV
RO
6.0 20
V16 = 5 V
Output voltage
Output resistance
IB = 1.7 mA
Attenuators
VCCSat
80 300 mV
Pin 21 VB 2.5 2.9 3.3
V
Pin 21 RO
250
Receive attenuator gain
f = 1 kHz, Rmode’ V24 = VB
V27 = 250 mVrms
Gain range
R to T modes
Idle mode, V27 = 250 Vrms
RECO voltage (R mode)
Delta RECO voltage
RECO sink current
(R mode)
Pin 26, 27 GR
2.0
6.0
10
dB
DGR 40 44 48 dB
GRI –20 –16 –12 dB
VRECO
1.8
2.3
3.2
V
DVRECO
100 mV
IRECOL
75
mA
RECO source current
(R mode)
IRECOH
1.0
3.0 mA
RECI input resistance
Volume control range
x x(R attenuator gain, R mode)
0.6 VB V24 VB
Transmit attenuator gain
RRECI
3.5
5.0
8.0
VCR 24.5 22.5 32.5
Pins 3 and 4
k
dB
f = 1 kHz, Tmode’
V3 = 250 mVrms
Gain range T to R mode
Idle mode, V3 = 250 mVrms
TO voltage (T mode)
Delta TO voltage
switch from T to R mode
TO sink current, T mode
TO source current, T mode
TI input resistance
GT 4.0 6.0 8.0 dB
DGT 40 44 48 dB
GTI –16.5 –13 –8.5 dB
VTO 1.8 2.3 3.2
V
DVTO
100 mV
ITOL
75
mA
ITOH
1.0
3.0 mA
RTI 3.5 5.0 8.0 k
4 (15)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 20-May-96

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U4080B 전자부품, 판매, 대치품
20
GT
0
GR
20
GT
0
U4080B
–20
DVRACF = 150 mV
DVRACF = 8 mV
–20
–40
GRT
–60
0
94 7865 e
GTR
R1 = 30 kW
100
RTG / R1 or RG / R1
Figure 4.
1000
–40
GR
–60
0
94 7866 e
0.2 0.4 0.6
VCI
Figure 5.
0.8 1.0
As can be seen from the truth table, the T-R comparator
dominates. The transmit detector comparator is effective
only in the transmit mode, and the volume control is
effective only in the receive mode. The T-R comparator
is in the transmit position when the transmit signal present
is greater than the receive signal. The transmit detector
comparator then determines whether the transmit signal
is a result of background noise (a relatively constant
signal), or speech, which consists of bursts. If the signal
is due to background noise, the attenuators will be put into
the idle mode (DVACF = 75 mV). If the signal consists of
speech, the attenuators will be switched to the transmit
mode (DVACF = 6.0 mV). For further explanation, please
refer to the transmit detector circuit (Log. amplifiers).
The T-R comparator is in the receive position when there
is sufficient receive signal to overcome the background
noise AND any speech signals. The DVACF voltage will
xbe 150 mV if the volume control is at the maximum
position, i.e. VCI (Pin 24) = VB. If VCI VB’, RG and
TG will vary in a complementary manner as shown in
figure 5 It can be seen that at the minimum recommended
operating level (VCI = 0.55 VB) the gain of the transmit
attenuator is actually greater than that of the receive atten-
uator. The effect of varying VCI is to vary DVACF, with
a resulting variation in the gains of the attenuators.
Figure 6 shows the gain variations with DVACF.
20
R
0
–20
–40 T
–60
0
94 7867 e
40 80 120
DVACF ( mV )
160
Figure 6.
A 4.7 µF capacitor at Pin 25 smooths the transition
between operating modes. This keeps down any “clicks”
in the speaker or transmit signal when the ACF voltage
switches. The gain separation of the two attenuators can
be reduced from the typical 45 dB by connecting a resistor
between Pins 20 and 25. The effect is a reduction of
voltage in the receive mode, but no effect on the transmit
mode voltage.
For example, adding a 12 kresistor will reduce DVACF
by approximately 15 mV (to 135 mV), decrease the gain
of the receive attenuator by approximately 5.0 dB, and
increase the gain of the transmit attenuator by a similar
amount. If the circuit requires the receive attenuator gain
to be +6.0 dB in the receive mode, RG must be adjusted
(to 27 k) to re-establish this value. This change will also
increase the receive attenuator’s gain in the transmit
mode by a similar amount. The resistor at TLI may also
require changing to reset the sensitivity of the transmit
level detector.
TELEFUNKEN Semiconductors
Rev. A1, 20-May-96
Preliminary Information
7 (15)

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관련 데이터시트

부품번호상세설명 및 기능제조사
U4080B

Voice-Switched Circuit for Handsfree Operation

TEMIC Semiconductors
TEMIC Semiconductors

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