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TEA1064AT View Datasheet(PDF) - Philips Electronics

Part NameDescriptionManufacturer
TEA1064AT Low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting Philips
Philips Electronics Philips
TEA1064AT Datasheet PDF : 36 Pages
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Philips Semiconductors
Low voltage versatile telephone transmission circuit
with dialler interface and transmit level dynamic limiting
Product specification
TEA1064A
handbook, full pagewidth
10
VLN(p-p)
(V)
8
6
4
2
MGR069
Iline-Ip
(mA)
25
23
21
19
17
15
13
11
0
3
3.5
4
4.5
5
5.5
VLN-VSLPE (V)
Fig.14 Maximum output swing on line as a function of the DC voltage drop VLN-SLPE with lline Ip as a parameter:
R15 = 392 ; R16 = 56 ; or R15 = 0 and R16 = 392 + 56 = 448 .
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).
Receiving amplifier IR, QR+, QRand GAR
The receiving amplifier has one input IR and two
complementary outputs, QR+ (non-inverting) and QR
(inverting). These outputs may be used for single-ended or
differential drive, depending on the type and sensitivity of
the earpiece used (see Fig.15). Gain from IR to QR+ is
typically 31 dB with R4 = 100 k, sufficient for
low-impedance magnetic or dynamic earpieces which are
suitable for single-ended drive. By using both outputs
(differential drive) the gain is increased by 6 dB.
Differential drive can be used when the earpiece
impedance exceeds 450 as with high-impedance
dynamic, magnetic or piezo-electric earpieces.
handbook, full pagewidth
QR+
5
4 QR
11 VEE
QR+
5
4 QR
QR+ (1)
5
4 QR
QR+ (2)
5
4 QR
MGR070
(a)
(b)
(c)
(d)
Fig.15 Alternative receiver arrangements: a) dynamic earpiece with an impedance less than 450 ; b) dynamic
earpiece with an impedance more than 450 ; c) magnetic earpiece with an impedance more than 450 Ω,
resistor (1) may be connected to prevent distortion (inductive load); d) piezo-electric earpiece, resistor (2)
is required to increase the phase margin (stability with capacitive load).
March 1994
12
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