U3761MB-T Datasheet, PDF (7/27 Pages) ATMEL Corporation – Universal Telephone IC - All Functions Integrated

U3761MB-T
Pin Description
Pin Symbol Function
Pin for testing
20
MUTE ^{Forcing MUTE to GND mutes the microphone and}
MUTE
decreases the earpiece signal by typically 29 dB; no pull up
circuit allowed
Configuration
6.7 V
PD
30K
VBG
MUTE
PRIVACY indication pin
21
PRIND Open collector with minimum 1 mA drive current to GND
when PRIVACY = active
PRIND
VL
6.7V
PD
22
RECIN
Receive amplifier input. The receiving amplification is
regulated by an AGC.
60K
RECIN
23
RECO2 Output of the receive amplifier. Dynamic transducers with a
minimum impedance of 100 W can be directly driven by
RECO2
24
RECO1 these outputs.
RECO1
6.7 V
PD
VL
60K 1 V
Time constant of anticlipping in transmit path.
25
CLIM CLIM ³ 2.2 µF
CLIM = GND: anticlipping inactive
CLIM
6V
PD
VL
IDC
The output of the sidetone cancellation signal, which
26
ST requires a balanced impedance of 8 to 10 times the
subscriber’s line impedance to be connected to pin VL.
ST
16 V
PD
7
4744A–CORD–09/03