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零件编号 | TEA1095TS | ||
描述 | Voice switched speakerphone IC | ||
制造商 | NXP Semiconductors | ||
LOGO | |||
1 Page
INTEGRATED CIRCUITS
DATA SHEET
TEA1095
Voice switched speakerphone IC
Product specification
Supersedes data of 1996 Mar 22
File under Integrated Circuits, IC03
1997 Nov 25
Philips Semiconductors
Voice switched speakerphone IC
Receive channel
Product specification
TEA1095
handbook, full pagewidth
to loudspeaker
amplifier
RGARX
CGARX
GARX
RXOUT
VI
MUTERX
to
to/from envelope
voice switch detector
IV
RXIN
from transmission
circuit
VOLUME
CONTROL
VOL
RVOL
MBG356
Fig.5 Receive channel.
RECEIVER AMPLIFIER: PINS RXIN, GARX, RXOUT AND
MUTERX
The TEA1095 has an asymmetrical input (RXIN) for the
receiver amplifier with an input resistance of 20 kΩ. The
gain of the input stage varies according to the mode of the
TEA1095. In the receive mode, the gain is at its maximum;
in the transmit mode, it is at its minimum and in the idle
mode, it is halfway between maximum and minimum.
Switch-over from one mode to the other is smooth and
click-free.
In the receive mode, the overall gain of the receive
amplifier can be adjusted from −14 dB to +26 dB to suit
application specific requirements. The gain from RXIN to
RXOUT is proportional to the value of RGARX and equals
6.5 dB with RGARX = 16.5 kΩ. A capacitor connected in
parallel with RGARX can be used to provide a first-order
low-pass filter.
By applying a HIGH level on pin MUTERX, the receiver
amplifier is muted and the TEA1095 is automatically
forced into the transmit mode.
VOLUME CONTROL: PIN VOL
The receiver amplifier gain can be adjusted with the
potentiometer RVOL. A linear potentiometer can be used to
obtain logarithmic control of the gain of the receiver
amplifier. Each 950 Ω increase of RVOL results in a gain
loss of 3 dB. The maximum gain reduction with the volume
control is internally limited to the switching range.
Duplex controller
SIGNAL AND NOISE ENVELOPE DETECTORS: PINS TSEN,
TENV, TNOI, RSEN, RENV AND RNOI
The signal envelopes are used to monitor the signal level
strength in both channels. The noise envelopes are used
to monitor background noise in both channels. The signal
and noise envelopes provide inputs for the decision logic.
The signal and noise envelopes detectors are shown in
Fig.6.
For the transmit channel, the input signal at TXIN is 40 dB
amplified to TSEN. For the receive channel, the input
signal at RXIN is 0 dB amplified to RSEN. The signals from
TSEN and RSEN are logarithmically compressed and
buffered to TENV and RENV respectively. The sensitivity
of the envelope detectors is set with RTSEN and RRSEN.
1997 Nov 25
8
Philips Semiconductors
Voice switched speakerphone IC
Product specification
TEA1095
SYMBOL
PARAMETER
CONDITIONS
Decision logic (IDT and SWT)
SIGNAL RECOGNITION
∆VSrx(th)
threshold voltage between
pins RENV and RNOI to
switch-over from receive to idle
mode
∆VStx(th)
threshold voltage between
pins TENV and TNOI to
switch-over from transmit to idle
mode
SWITCH-OVER
Isource(SWT) current sourced from pin SWT
when switching to receive mode
Isink(SWT)
current sunk by pin SWT when
switching to transmit mode
Iidle(SWT)
current sourced from pin SWT in
idle mode
VRXIN < VRINDT; note 2
note 2
Voice switch (STAB and SWR)
SWRA
switching range
∆SWRA
∆Gv
switching range adjustment
voltage gain variation from
transmit mode to idle mode on
both channels
with RSWR referenced to
RSWR = 365 kΩ
Gtr gain tracking (Gvtx + Gvrx) during
switching, referenced to idle mode
Notes
1. Corresponds to ±1 dB tracking.
2. Corresponds to 4.3 dB noise/speech recognition level.
MIN.
−
−
7.5
7.5
−
−
−40
−
−
TYP. MAX. UNIT
13 −
mV
13 −
mV
10 12.5
10 12.5
0−
µA
µA
µA
40 −
− +12
20 −
±0.5 −
dB
dB
dB
dB
1997 Nov 25
16
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页数 | 28 页 | ||
下载 | [ TEA1095TS.PDF 数据手册 ] |
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