U4091BM-N Datasheet, PDF (5/38 Pages) ATMEL Corporation – PROGRAMMABLE TELEPHONE AUDIO PROCESSOR

U4091BM-N
Pin Description
Pin
Symbol Function
1
RECIN Receive amplifier input⁽¹⁾
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 (typically 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
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
RESET Reset output for the microcontroller
28
OSCOUT Clock 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 additional line impedance
Note: 1. The protection device at Pin RECIN is disconnected.
5
4666B–CORD–08/04