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PDF ( 数据手册 , 数据表 ) TEA1085AT

零件编号 TEA1085AT
描述 Listening-in circuit for line-powered telephone sets
制造商 NXP Semiconductors
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TEA1085AT 数据手册, 描述, 功能
INTEGRATED CIRCUITS
DATA SHEET
TEA1085; TEA1085A
Listening-in circuit for line-powered
telephone sets
Preliminary specification
File under Integrated Circuits, IC03A
March 1992







TEA1085AT pdf, 数据表
Philips Semiconductors
Listening-in circuit for line-powered
telephone sets
Preliminary specification
TEA1085; TEA1085A
ndbook5, .h5alfpage
VBB
(V)
5.1
4.7
4.3
3.9
3.5
10
MGR035
Logic gain control (GSC1 and GSC2) pins 7 and 8
The logic inputs GSC1 and GSC2 can be used to reduce
the gain of the loudspeaker amplifier by means of the logic
gain control function in 3 steps of 6 dB.
Table 1 Data for microcontroller drive of logic inputs
GSC2 GSC1
00
01
10
11
gain
(dB)
35
28.7
22.2
17
gain reduction
(dB)
0
6.3
12.2
18
VBB = 3.60 V Where:
102
R38 (k)
103
0 = connection to VSS or left open-circuit
1 = applying a voltage VSS + 1.5 V
Fig.5 Stabilized supply voltage as a function of
R38.
Supply amplifier stability (SDC) pin 3
To ensure stability of the TEA1085/TEA1085A, in
combination with a transmission IC of the TEA1060 family,
a 47 pF capacitor connected between SDC and SUP and
a 150 µH coil connected between SUP and the positive
line terminal (Fig.16) is required.
Loudspeaker amplifier (LSI1/LSI2 and QLS1/QLS2)
pins 5/6, 21/22
The TEA1085/TEA1085A have symmetrical inputs at LSI1
and LSI2. The input signal is normally taken from the
earpiece output of the transmission circuit via a resistive
attenuator (see Fig.3). The amount of attenuation must be
chosen in accordance with the receive gain of the
transmission IC (which depends on the sensitivity of the
earpiece transducer). The maximum input signal level is
450 mV(RMS) at Tamb = +25 °C.
The outputs QLS1 and QLS2 can be used for single ended
drive (SE) or bridge tied load drive (BTL). The output
stages have been optimized for use with a 50
loudspeaker (e.g. Philips type AD2071).
The gain of the amplifier is fixed to 35 dB for the SE drive
and 41 dB for the BTL drive (when the inputs for logic
control are left open-circuit or are connected to VSS).
The volume control can be obtained by using a
potentiometer at the input and/or by the logic control
function.
March 1992
8







TEA1085AT equivalent, schematic
Philips Semiconductors
Listening-in circuit for line-powered
telephone sets
Preliminary specification
TEA1085; TEA1085A
CHARACTERISTICS
VSREF = 4.2 V; VSS = 0 V; ISUP = 15 mA; VSUP = 0 V(RMS); f = 800 Hz; Tamb = 25 °C; PD = LOW; MUTE (TEA1085) =
OFF (listening-in mode); MUTE (TEA1085A) = HIGH (listening-in mode); GSC1 = GSC2 = LOW; 50 loudspeaker;
no R38; test circuit Fig.14; unless otherwise specified
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Supplies
VSUP
minimum DC input voltage
VSUP-SREF internal reference voltage
VBB stabilized supply voltage no R38; ISUP = 15 mA
VBB
variation from
ISUP = 15 to 120 mA
R38 = 39.2 kbetween
pins VSS and VA;
VSREF = 5.2 V;
ISUP = 15 mA
VBB /T variation with temperature no R38; ISUP = 15 mA
ISUP minimum operating current
THD
distortion of AC signal on SUP VSUP(RMS) = 1 V
Vno(RMS) noise between SUP and VEE
current consumption in
PD = HIGH
power-down condition
ISUP
IBB
VSUP = 4.5 V
VBB = 3.6 V
Loudspeaker amplifier inputs LSI1 and LSI2
|Zi| input impedance
single ended
differential
Gv voltage gain with 50 load ISUP = 15 mA;
Vi = 1.8 mV(RMS)
single ended
BTL output
Gv
variation with signal level
ISUP = 50 mA;
Vi = 1.8 mV(RMS) and
14 mV(RMS)
single ended
BTL output
Gv variation with frequency
referred to 1 kHz
f = 300 Hz and 3400 Hz;
Vi = 1.8 mV(RMS)
single ended
BTL output
Gv
variation with temperature
Tamb = 25 to +75 °C
referred to 25 °C
single ended
BTL output
275
3.4
4.2
tbf
7.5
15
34
39.9
VBB + 0.7
315
3.6
10
355
3.8
4.45 4.7
0.2 tbf
4.2 5.5
0.3
72
55 75
400 550
9.5 11.5
19 23
35 36
40.9 41.9
+0.1 0.4
+0.2 0.6
± 0.1
± 0.1
± 0.4
± 0.5
V
mV
V
mV
V
V
mA
%
dBmp
µA
µA
k
k
dB
dB
dB
dB
dB
dB
dB
dB
March 1992
16










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