U3761MB-T ATMEL [ATMEL Corporation], U3761MB-T Datasheet - Page 7

• Manufacturer Part Number: U3761MB-T
• Description: Universal Telephone IC - All Functions Integrated
• Manufacturer: ATMEL [ATMEL Corporation]

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