tea1069n NXP Semiconductors, tea1069n Datasheet - Page 11

• Manufacturer Part Number: tea1069n
• Description: Versatile Speech/dialler/ringer With Music-on-hold
• Manufacturer: NXP Semiconductors

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Philips Semiconductors
D
When the DTMF input is enabled (MUTE is LOW) dialling
tones may be sent on to the line. The voltage gain from
DTMF to LN is typically 25.5 dB (when R7 = 68 k ) and
varies with R7 in the same way as the microphone gain.
The tones can be heard in the earpiece at a low level
(confidence tone).
A
Automatic line loss compensation is achieved by
connecting a resistor (R6) between AGC and V
The automatic gain control varies the gain of the
1998 Jan 08
UTOMATIC
UAL
Versatile speech/dialler/ringer with
music-on-hold
Pin numbers in parenthesis refer to the TEA1069H and TEA1069AH.
(1) Resistor may be connected to prevent distortion (inductive load).
(2) Resistor is required to increase the phase margin (capacitive load).
T
ONE
G
M
AIN
ULTI
a. Dynamic earpiece.
C
-F
V EE
ONTROL INPUT
QR
REQUENCY INPUT
1 (39)
23 (18)
AGC
DTMF
Fig.8 Alternative receiver arrangements.
EE
b. Magnetic earpiece.
.
V EE
QR
1 (39)
23 (18)
11
microphone amplifier and the receiving amplifier in
accordance with the DC line current.
The control range is 5.8 dB which corresponds to a line
length of 5 km for a 0.5 mm diameter twisted-pair copper
cable with a DC resistance of 176 /km and average
attenuation of 1.2 dB/km. Resistor R6 should be chosen in
accordance with the exchange supply voltage and its
feeding bridge resistance (see Fig.9 and Table 1).
The ratio of start and stop currents of the AGC curve is
independent of the value of R6. If no automatic line-loss
compensation is required the AGC pin may be left
open-circuit. The amplifiers, in this condition, will give their
maximum specified gain.
(1)
c. Piezoelectric earpiece.
V EE
QR
TEA1069; TEA1069A
1 (39)
23 (18)
(2)
MBH199
Product specification