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TELEFUNKEN Semiconductors
U4091B
Programmable Telephone Audio Processor
Description
The programmable telephone audio processor U4091B is a linear integrated circuit for use in feature phones, answering machines and fax machines. It contains the speech circuit, tone ringer interface with dc/dc converter, sidetone equivalent and ear protection rectifiers. The circuit is line powered and contains all components necessary for amplification of signals and adaptation to the line. An integrated voice switch with loudspeaker amplifier allows handsfree or loudhearing operation. With an anti-feedback function, acoustical feedback during loudhearing can be reduced significantly. The generated supply voltage is suitable for a wide range of peripheral circuits.
Features
D D D D
Speech circuit with anti-clipping Tone ringer interface with dc / dc converter Speaker amplifier with anti-distortion Power supply management, regulated, unregulated and a special supply for electret microphone
Benefits
D Savings of one piezo electric transducer D Complete system integration of analog signal processing on one chip
D Very few external components
D Voice switch
Applications
Feature phone, answering machine, fax machine, speaker phone
Voice switch
Rev. A1: 12.07.1995
Preliminary Information
AA AA
BUS
Speech circuit
Audio amplifier
Loudhearing and Tone ringing
MC with EEPROM/ DTMF
Tone ringer
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U4091B
Serial Bus Controlled Functions
Speech circuit Ringer
TELEFUNKEN Semiconductors
D Transmit gain: 36 to 52 dB (1 dB step) D Receive gain: -7 dB to +9 dB (1 dB step) + one 6 dB
step
D Volume adjustment
Voice switch
D Speaker amplifier gain: -10 dB to +30 dB (1.5 dB
step)
D Mute R, Mute T D Automatic gain adjustment ( AGA ): 7 different D Impedance selection: 600/ 900 W
characteristics
D D D D D D D
Volume adjustment Attenuation range: 0 to 50 dB (1 dB steps) 4 thresholds for mode switching Mute of handsfree microphone Chip disable Hand set / handsfree switching Four point level detection
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Preliminary Information
Rev. A1: 12.07.1995
TELEFUNKEN Semiconductors
U4091B
Pin Symbol TSACL SA I Function Time constant of anti-clipping of speaker amplifier Speaker amplifier input (for loudspeaker, tone ringer and handsfree use) Receive level output 1 Receive level input 1 Handsfree Mic input Background noise monitor in transmit direction Receive level input 2 Receive level output 2 Clock Data Reset Internal reference current generation; RREF = 62 k; IREF = 20 A Side tone reduction output output resistance is approx. 300 , maximum load impedance: 10 k. Reference node for microphoneearphone and loudspeaker amplifier, supply for electret microphone (IM 300 mA)
Pin Description
Pin Symbol DTMF Function Input for DTMF signals, also used for the answering machine and handsfree input Output of microphone preamplifier Non-inverting input of microphone amplifier Inverting input of microphone amplifier Active high input for reducing the current consumption of the circuit, simultaneously VL is shorted by an internal switch 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 reduce the dc line voltage Line voltage Reference point for dc- and ac-output signals A small resistor (fixed) connected from this pin to VL sets the slope of the dc characteristic and also effects the line length equalization characteristics and the line current at which the loudspeaker amplifier is switched on Unregulated supply voltage for peripheral circuits (voice switch), limited to typically 7 V Output of loudspeaker amplifier Unregulated supply voltage for P, limited to 6.3 V Regulated supply voltage 3.3 V for peripheral circuits (especially microprocessors), maximum output current: 2 mA
MICO MIC 2 MIC 1 PD
RLO1 RLI1 MICHF BNMT RLI2 RLO2 C D Reset IREF
IND
VL GND SENSE
STO
VM
VB
SAO VMPS VMP
SWOUT Output for driving external switching transistor COSC 40 kHz oscillator for ringing power converter VRING Input for ringing signal THA Threshold adjustment for ringing frequency detector RFDO Output of ringing frequency detector LIDET Line detect; output is low when the line current is more than 15 mA
RECO 2 Inverting output of receiving amplifier STI S Input for side tone network (short loop) or for answering machine STI L Input for side tone network (long loop) RAC Input of receiving amplifier for ac coupling in feedback path RECO 1 Output of receiving amplifier TTXA Time constant of anticlipping in transmit path RECIN Input of receiving path; input impedance is typically 80 kW TXIN Input of intermediate transmit stage, input resistance is typically 20 k TLDI Transmit level detector input TLDO Time constant of level detector for transmit voice recognition TS Time constant for switching
Rev. A1: 12.07.1995
Preliminary Information
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U4091B
Absolute Maximum Ratings
Parameters Line current DC line voltage Maximum input current Junction temperature Ambient temperature Storage temperature Total power dissipation, Tamb = 60C Symbol IL VL IRING Tj Tamb Tstg Ptot
TELEFUNKEN Semiconductors
Value 140 12 15 125 - 25 to + 75 - 55 to + 150 0.9
Unit mA V mA C C C W
Thermal Resistance
Junction ambient Parameters SSO44 Symbol RthJA Value 70 Unit K/W
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Preliminary Information
Rev. A1: 12.07.1995
TELEFUNKEN Semiconductors
U4091B
Electrical Characteristics
f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 kW, Tamb = 25C, Zear = 68 nF + 100 W, ZM = 68 nF, unless otherwise specified. Parameters DC characteristics DC voltage drop over circuit Test Conditions / Pin IL = 2 mA IL = 14 mA IL = 60 mA IL = 100 mA Symbol VL 4.6 8.8 Min. Typ. 2.4 5.0 7.5 9.4 Max. Unit Figure
5.4 10.0
V
Transmission amplifier, IL = 14 mA, VMIC = 2 mV, RGT = 27 kW, unless otherwise specified Adjustment range of transmit GT 36 52 gain Transmitting amplification GT 47 48 49 Frequency response IL 14 mA, DGT f = 300 to 3400 Hz Gain change with current Pin 31 open DGT IL = 14 to 100 mA Gain deviation Tamb = - 10 to + 60 C DGT CMRR of microphone CMRR 60 80 amplifier Input resistance of MIC RGT = 12 kW Ri 50 amplifier RGT = 27 kW 75 45 110 Distortion at line IL > 14 mA dt 2 VL = 700 mVrms Maximum output voltage IL > 19 mA VLmax 1.8 3 4.2 d < 5% Vmic = 25 mV CTXA = 1 mF
dB dB dB dB dB dB kW % dBm
w
"0.5 "0.5 "0.5
Noise at line psophometrically weighted Anti-clipping attack time release time Gain at low operating current
Distortion at low operating current
Line loss compensation Mute suppression a) MIC muted (microphone preamplifier p p b) TXA muted (second stage)
IL > 14 mA GT = 48 dB CTXA = 1 mF each 3 dB overdrive IL = 10 mA IMP = 1 mA RDC = 68 kW Vmic = 1 mV IM = 300 mA IL = 10 mA IM = 300 mA IMP = 1 mA RDC = 68 kW Vmic = 10 mV IL = 100 mA IL 14 mA Mutx = open
no - 80 0.5 9 GT 40 -72 dBmp ms
42.5
dB
dt
5
%
w
DGTI
GTM
- 6.4 60
- 5.8 80
- 5.2
dB dB
IMPSEL = open
GTTX
60
dB
Rev. A1: 12.07.1995
Preliminary Information
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U4091B
w w
TELEFUNKEN Semiconductors
Unit dB Figure
Parameters Test Conditions / Pin Symbol Min. Typ. Max. Receiving amplifier, IL = 14 mA, RGR = 62 k, unless otherwise specified, VGEN = 300 mV Adjustment range of IL 14 mA, GR -7 +15 receiving gain single ended differential MUTR = GND Receiving amplification Amplification of DTMF signal from DTMF IN to RECO 1, 2 Frequency response Gain change with current Gain deviation Ear protection differential MUTE suppression a) RECATT b) RA2 c) DTMF operation RGR = 62 kW differential IL 14 mA VMUTX = VMP IL > 14 mA, f = 300 to 3400 Hz IL = 14 to 100 mA Tamb = - 10 to + 60C IL 14 mA VGEN = 11 Vrms IL 14 mA MUTR = open VMUTR = VMP VMUTX = VMP GR GRM - 1.75 7 -1 10 - 0.25 13
dB dB
DGRF
DGR DGR
w w
"0.5 "0.5 "0.5
2.2 60
dB dB dB Vrms dB
EP
DGR
Output voltage d 2% differential Maximum output current d 2% Receiving noise psophometrically weigthed Output resistance
v
v
IL = 14 mA Zear = 68 nF + 100 W Zear = 100 W Zear = 68 nF + 100 W IL 14 mA each output against GND RAGA = 20 kW, IL = 100 mA IL = 10 mA IMP = 1 mA IM = 300 mA VGEN = 560 mV RDC = 68 kW VIMPSEL = GND VIMPSEL = VMP IL = 10 mA IMP = 1 mA VGEN = 560 mV RDC = 68 kW
0.775 4 ni Ro
DGRI
w
- 80
- 77 10
Vrms mA (peak) dBmp
W
Line loss compensation Gain at low operating current
- 7.0
- 6.0
- 5.0
dB
GR
-2
-1
0
dB
AC impedance Distortion at low operating current
Zimp Zimp dR
570 840
600 900
640 960 5
W W
%
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Preliminary Information
Rev. A1: 12.07.1995
TELEFUNKEN Semiconductors
Parameters Speaker Amplifier Minimum line current for operation Input resistance Gain from SAI to SAO Output power Test Conditions / Pin No ac signal Symbol ILmin 14 30 Min. Typ.
U4091B
Max. 16 22 31 -3 32 Unit mA kW dB Figure
VSAI = 3 mV, RGSA = 20 kW Load resistance RL = 50 W, d < 5% VSAI = 20 mV IL = 20 mA
GSA
PSA PSA nSA
t.b.d. 200
mW
Output noise (Input SAI open) psophometrically weighted Gain deviation Mute suppression
mVpsoph
dB dBm
Gain change with current DGSA Gain change with frequency f = 300 to 3400 Hz DGSA Attack time of anti-clipping 20 dB over drive tr 5 Release time of anti-clipping tf 80 DTMF-Amplifier Test conditions: IMP = 2 mA, IM = 0.3 mA, VMUTX = VMP Adjustment range of DTMF IL = 15 mA GD 40 48 gain Mute active DTMF amplification IL = 15 mA, GD 40.7 41.7 42.7 VDTMF = 8 mV Mute active: MUTX = VMP IL = 15 mA Tamb = - 10 to + 60 C Input resistance RGT = 27 kW, RGT = 15 kW Distortion of DTMF signal IL 15 mA VL = 0 dBm Gain deviation with current IL = 15 to 100 mA AFS Acoustic feedback suppression Adjustment range of attenuation Gain deviaton GD Ri dD 60 26 180 70
Tamb = - 10 to + 60C VL = 0 dBm, VSAI = 4 mV Pin 23 open
DGSA
VSAO
"1
- 60
"1 "0.5
dB dB ms ms dB dB
"0.5
300 130 2
dB kW % dB dB
w
DGD
0
"0.5
50
Rev. A1: 12.07.1995
Preliminary Information
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U4091B
Parameters Test Conditions / Pin Symbol Supply voltages, Vmic = 25 mV, Tamb = - 10 to + 60C VMP IL = 14 mA, VMP RDC = 68 kW IMP = 2 mA VMPS IL = 100 mA VMPS RDC = inf., IMP = 0 mA VM IL 14 mA, VM IM = 300 mA RDC = 130 kW VB IB = + 20 mA, VB IL = 0 mA Ringing power converter, IMP = 1 mA, IM = 0 Maximum output power VRING = 20.6 V PSA Threshold of ring frequency RFDO: low to high VRINGON detector VHYST = VRINGON - VRINGO VHYST FF Min. 3.1
TELEFUNKEN Semiconductors
Typ. 3.3 Max. 3.5 Unit V Figure
6.7
V
w
1.4
3.3
V
7
7.6
V
20 17.5 11.0 4 150 5 6
mW V
Input impedance Input impedance in speech mode Logic-level of frequency detector PD Input PD input current Input voltage Voltage drop at VL
VRING = 30 V f = 300 Hz to 3400 Hz IL > 15 mA,
VRING = 20V + 1.5Vrms
RRING RRINGSP
kW kW
VRING = 0 V, VB = 4 V VRING = 25 V PD active, IL > 14 mA VPD = VMP PD = active PD = inactive IL = 14 mA, PD = active IL = 100 mA, PD = active PD = inactive PD = inactive VB = 5 V, PD = active
VRFDO
0 VMP
V
Ipd Vpd Vpd VL VL 2
9
uA V 0.3
1.5 1.9
V
Line detection Line current for LIDET active Line current for LIDET inactive Current threshold during power down
ILON ILOFF ILONPD 0.8
12.6 11.0 1.6 2.4
mA mA mA
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Preliminary Information
Rev. A1: 12.07.1995
TELEFUNKEN Semiconductors
U4091B
CO
94 7896 e
CLOCK OUTPUT
Serial Bus
The circuit is remoted by an external microcontroller through the serial bus: The data is an 8-bit word: B7 - B6 - B5: address of the destination register (0 to 7) B4 - B0: contents of register The data line must be stable when the clock is high and data must be serially shifted. After 8 clock periods, the transfer to the destination register is (internally) generated by a low to high transition of the data line when the clock is high.
DATA D
mP
C CLOCK
937613
937614
Rev. A1: 12.07.1995
Preliminary Information
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U4091B
8 bits register
DATA CLOCK
TELEFUNKEN Semiconductors
Serial Bus Interface
937616
Analog Commands
937615
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Preliminary Information
Rev. A1: 12.07.1995
TELEFUNKEN Semiconductors
U4091B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( ODSs). The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency ( EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively. TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances.
We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
Rev. A1: 12.07.1995
Preliminary Information
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