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PDF TEA1064BT Data sheet ( Hoja de datos )
| Número de pieza | TEA1064BT | |
| Descripción | Low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
TEA1064B
Low voltage versatile telephone
transmission circuit with dialler
interface and transmit level
dynamic limiting
Product specification
File under Integrated Circuits, IC03A
March 1994
1 page  
Philips Semiconductors
Low voltage versatile telephone transmission circuit
with dialler interface and transmit level dynamic limiting
Product specification
TEA1064B
PINNING
SYMBOL
LN
GAS1
GAS2
QR−
QR+
GAR
DLS/MMUTE
MIC−
MIC+
STAB
VEE1
DTMF
IR
MUTE
PD
VCC
REG
AGC
VEE2
SLPE
PIN DESCRIPTION
1 positive line terminal
2 gain adjustment; transmitting amplifier
3 gain adjustment; transmitting amplifier
4 inverting output; receiving amplifier
5 non-inverting output; receiving amplifier
6 gain adjustment; receiving amplifier
7 decoupling for transmit amplifier dynamic and microphone MUTE input
8 inverting microphone input
9 non-inverting microphone input
10 current stabilizer
11 negative line terminal
12 dual-tone multi-frequency input
13 receiving amplifier input
14 mute input
15 power-down input
16 internal supply decoupling
17 voltage regulator decoupling
18 automatic gain control input
19 reference for POWER-DOWN (PD), MUTE and DTMF
20 slope adjustment for DC curve/reference for peripheral circuits
March 1994
handbook, halfpage
LN 1
20 SLPE
GAS1 2
GAS2 3
19 VEE2
18 AGC
QR− 4
17 REG
QR+ 5
16 VCC
TEA1064B
GAR 6
15 PD
DLS/MMUTE 7
14 MUTE
MIC− 8
13 IR
MIC+ 9
12 DTMF
STAB 10
11 VEE1
MBA433
Fig.2 Pin configuration.
5
5 Page 
Philips Semiconductors
Low voltage versatile telephone transmission circuit
with dialler interface and transmit level dynamic limiting
Product specification
TEA1064B
Dynamic limiter (microphone) pin DLS/MMUTE
A low level at the DLS/MMUTE pin inhibits the microphone
inputs MIC+ and MIC− but has no influence on the
receiving and DTMF amplifiers.
Removing the low level at the DLS/MMUTE pin provides
the normal function of the microphone amplifier after a
short time determined by the capacitor connected to
DLS/MMUTE pin. The microphone mute function can be
realised by a simple switch as shown in Fig.11.
To prevent distortion of the transmitted signal, the gain of
the sending amplifier is reduced rapidly when peaks of the
signal on the line exceed an internally-determined
threshold. The time in which gain reduction is effected
(attack time) is very short. The circuit stays in the
gain-reduced condition until the peaks of the sending
signal remain below the threshold level. The sending gain
then returns to normal after a a time determined by the
capacitor connected to DLS/MMUTE (release time).
The internal threshold adapts automatically to the DC
voltage setting of the circuit (VLN-SLPE). This means that
the maximum output swing on the line will be higher if the
DC voltage dropped across the circuit is increased.
Fig.12 shows the maximum possible output swing on the
line as a function of the DC voltage drop (VLN-SLPE) with
Iline − Ip as a parameter.
The internal threshold level is lowered automatically if the
DC current in the transmit output stage is insufficient. This
prevents distortion of the sending signal in applications
using parallel-connected telephones or telephones
operating over long lines, for example.
Dynamic limiting also considerably improves sidetone
performance in over-drive conditions (less distortion;
limited sidetone level).
handbook, halfpage
R17
3.3 kΩ
DLS/MMUTE
7
VEE1
11
MBA440
Fig.11 Microphone-mute function.
10
VLN(p-p)
(V)
8
6
4
2
MBA464
Iline-Ip
(mA)
25
23
21
19
17
15
13
11
0
3 3.5 4 4.5 5 5.5
VLN-VSLPE (V)
R16 = 392 Ω.
Fig.12 Typical output swing on line as a function of
the DC voltage drop VLN-SLPE with
Iline − Ip as a parameter.
March 1994
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TEA1064BT.PDF ] | |
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