U4091BM Datasheet, PDF (3/29 Pages) TEMIC Semiconductors – Programmable Telephone Audio Processor

Pin Description
Pin Symbol
Function
1 RECIN Receive amplifier input
2 TXACL Time-constant adjustment for
transmit anti-clipping
3 MIC3 Microphone input for hands-free
operation
4 MIC2 Input of symmetrical microphone
amplifier with high common-mode
rejection ratio
5 MIC1 Input of symmetrical microphone
amplifier with high common-mode
rejection ratio
6 RECO2 Output of the receive amplifier
7 RECO1 Output of the receive amplifier, also
used for sidetone network
8 IND The internal equivalent inductance
of the circuit is proportional to the
value of the capacitor at this pin. A
resistor connected to ground may be
used to adjust the DC mask.
9
VL Positive supply-voltage input to the
device in speech mode
10 SENSE Input for sensing the available line
current
11 GND Ground, reference point for DC- and
AC signals
12 VB Unstabilized supply voltage for
speech network
13 SAO2 Negative output of speaker
amplifier (push-pull only)
14 SAO1 Positive output of speaker amplifier
(single ended and push-pull
operation)
15 VMPS Unregulated supply voltage for the
microcontroller (via series regulator
to VMP)
16 VMP Regulated output voltage for
supplying the microcontroller
(typ. 3.3 V/ 6 mA in speech mode)
17 VMIC Reference node for microphone
amplifier, supply for electret
microphones
18 TSACL Time constant for speaker amplifier
anti-clipping
U4091BM
Pin Symbol
Function
19 VRING Input for ringer supply
20 IMPA Input for adjusting the ringer input
impedance
21 COSC 70-kHz oscillator for ringing power
converter
22 SWOUT Output for driving the external
switch resistor
23 INT Interrupt line for serial bus
24 SCL Clock input for serial bus
25 SDA Data line for serial bus
26 OSCIN Input for 3.58-MHz oscillator
27 OSCOUT Clock output for the microcontroller
28 RESET Reset output for the microcontroller
29 ES Input for external supply indication
30 ADIN Input of A/D converter
31 BNMR Output of background-noise monitor
receive
32 BNMT Output of background-noise monitor
transmit
33 CT Time constant for mode switching
of voice switch
34 TLDR Time constant of receive-level
detector
35 INLDR Input of receive-level detector
36 INLDT Input of transmit-level detector
37 TLDT Time constant of transmit-level
detector
38 IMPSW Switch for aditional line impedance
39 MICO Microphone preamplifier output
40 AMPB Input for playback signal of
answering machine
41 AMREC Output for recording signal of
answering machine
42 STO Output for connecting the sidetone
network
43 STC Input for sidetone network
44 STRC Input for sidetone network
Remark: The protection device at Pin RECIN is disconnected.
Rev. A1, 02-Jun-98
3 (29)
Target Specification