Features * * * * * * * * * * * * * * DC Characteristic Adjustable Receive Gain Adjustable Symmetrical Input of Microphone Amplifier Anti-clipping in Transmit Direction Automatic Line-loss Compensation Symmetrical Output of Earpiece Amplifier Built-in Ear Protection DTMF and MUTE Input Adjustable Sidetone Suppression Independent of Sending and Receiving Amplification Power Down Tone-ringer Interface 2-bit D/A for Volume Control Supply Voltages for All Functional Blocks of a Subscriber Set Operation Possible from 8-mA Line Currents Microcontrollercontrolled Speech and Ringer Circuit U4037B-N Applications * Telephone Sets Benefits * Complete System Integration of Analog Signal Processing on One Chip * Very Few External Components 1. Description The microcontroller-controlled telephone circuit U4037B-N is a linear integrated circuit for use in telephone sets. It contains the speech circuit, tone-ringer interface, 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. Figure 1-1. Block Diagram Speech circuit Power supply PWR Microcontroller Tone ringer Rev. 4742B-CORD-11/05 2. Pin Configuration Figure 2-1. Pinning SO24 MICO 1 24 MIC2 ST 2 23 MIC1 TXACL 3 22 RECO2 AGA 4 21 RECO1 DTMF 5 20 RIF VOL1 6 19 RECIN MU/VOL2 7 18 VB MEL 8 17 IMP PD 9 16 GND VMP 10 VRING 11 OUT2 12 2 15 VL 14 IND 13 OUT1 U4037B-N 4742B-CORD-11/05 U4037B-N Table 2-1. Pin Description Pin Symbol Function 1 MICO 2 ST 3 TXACL 4 AGA 5 DTMF Input for DTMF signals 6 VOL1 2-bit volume adjustment for tone ringer Output of microphone preamplifier Sidetone reduction input, input resistance is approximately 25 k Time constant of anti-clipping in transmit path Automatic gain adjustment with line current, a resistor connected from this pin to GND sets the starting point maximum gain change: 6 dB 1) 2-bit volume adjustment for tone ringer 2) Mute of microphone amplifier: - Speech condition, input MU/VOL2 low - DTMF condition input MU/VOL2 high DTMF signal at pin 5 is fed to the line. A part of the DTMF signal is passed to the receiving amplifier as a confidence signal during dialing 7 MU/VOL2 8 MEL 9 PD 10 VMP 11 VRING 12 OUT2 13 OUT1 14 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 reduce the DC line voltage 15 VL Line voltage 16 GND Reference point for DC- and AC-output signals 17 IMP Impedance adjustment 18 VB Unregulated supply voltage for peripheral circuits (voice switch), limited to typically 7V 19 RECIN 20 RIF Input for melody Active high input for reducing the current consumption of the circuit, VL simultaneously is shorted by an internal switch 3.4V regulated supply voltage for peripheral circuits (especially microprocessors), minimum output current: 2 mA (ringing), 4 mA (speech mode) Input for ringer supply voltage Differential output for tone ringer Receiver input Pin for adjustment of frequency response and gain of receiver 21 RECO1 Output of receiving amplifier 22 RECO2 Inverting output of receiving amplifier 23 MIC1 Inverting input of microphone amplifier 24 MIC2 Non-inverting input of microphone amplifier 3 4742B-CORD-11/05 4 * 4.7n VMP VB AGA DTMF MIC2 RA MU/ VOL2 TXA RECO1 MEL RECO2 DC - Mask and supply Power down control 130k 10 10n 220n VRING 10 GND IND IMP 10 V L RECIN PD 12 V 200k 3.3M 16 V 1M 10 Microcontroller Ring VMP Tip * OUT2 VOL1 Volume control AGA 33k * OUT1 BUZA - + RIF 50 * * Value depends on the application VMPREG2 VMPREG1 ST 100n 50 1n * To microcontroller 47 1000 20k MIC1 * 51k 6.8n 3.3n 12k TXACL MICO TXACL 33n 560 * 10k 1k 10k 15k 6.8n * 5.6n 1k VMP 20k 1 23k Figure 2-2. Detailed Block Diagram with External Components * * U4037B-N 4742B-CORD-11/05 U4037B-N 3. Absolute Maximum Ratings Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters Symbol Value Unit Line current IL 140 mA DC line voltage VL 12 V IRING 15 mA Maximum input current Junction temperature Tj 125 C Ambient temperature Tamb -25 to +75 C Storage temperature Tstg -55 to +150 C Total power dissipation, Tamb = 60C Ptot 520 W Symbol Value Unit RthJA 75 K/W 4. Thermal Resistance Parameters Junction ambient 5. Electrical Characteristics f = 1 kHz, 0 dBm = 775 mVrms, IMP = 2 mA, Tamb = 25C, Zear = 68 nF + 100, ZM = 68 nF, unless otherwise specified Parameters Test Conditions Symbol Min. Typ. Max. Unit DC Characteristics DC voltage drop over circuit IL = 2 mA IL = 14 mA IL = 60 mA IL = 100 mA VL 8.8 2.4 5.0 7.5 9.4 10.0 47 48 49 dB 4.6 5.4 V Transmission Amplifier, IL = 14 mA, VMIC = 2 mV, Unless Otherwise Specified Transmitting amplification GT Frequency response IL 14 mA f = 300 to 3400 Hz GT 0.5 dB Gain change with current IL = 14 to 100 mA GT 0.5 dB Gain deviation Tamb = -10 to +60C GT 0.5 dB CMRR of microphone amplifier CMRR Input resistance of MIC amplifier 60 Ri 80 dB 50 kW Distortion at line IL > 14 mA VL = 700 mVrms Maximum output voltage IL > 19 mA, d < 5% VMIC = 10 mV CTXA = 1 F Noise at line psophometrically weighted IL > 14 mA GT = 48 dB Anti-clipping attack time release time CTXA = 1 F each 3 dB overdrive Line-loss compensation IL = 100 mA, RAGA = 20 k GTI -6.4 -5.8 Mute suppression IL 14 mA GTM 60 80 dt VLmax 1.8 no 2 % 3 4.2 dBm -80 -72 dBmp 0.5 9 ms -5.2 dB dB 5 4742B-CORD-11/05 5. Electrical Characteristics (Continued) f = 1 kHz, 0 dBm = 775 mVrms, IMP = 2 mA, Tamb = 25C, Zear = 68 nF + 100, ZM = 68 nF, unless otherwise specified Parameters Test Conditions Symbol Min. Typ. Max. Unit Receiving Amplifier, IL = 14 mA, Unless Otherwise Specified, VGEN = 300 mV Receiving amplification GR 12 dB 12 dB 20 dB GR -8 Amplification of DTMF signal from DTMF IN to RECO 1, 2 IL 14 mA VDTMF = 8 mV GRM 14 Frequency response IL > 14 mA f = 300 to 3400 Hz GRF 0.5 dB Gain change with current IL = 14 to 100 mA GR 0.5 dB Gain deviation Tamb = -10 to + 60C GR 0.5 dB Ear protection differential IL 14 mA VGEN = 11 Vrms EP 2.2 Vrms MUTE suppression IL 14 mA GR Output voltage d 2% differential IL = 14 mA, Zear = 68 nF + 100 Output voltage d 5% differential IL = 14 mA Zear = 68 nF + 100 RDC = infinite Receiving noise psophometrically weighted Zear = 68 nF + 100 IL 14 mA ni -64 dBmp Output resistance Each output against GND Ro 40 Line-loss compensation RAGA = 20 k IL = 100 mA Gain at low operating current IL = 8 mA, IMP = 1 mA IM = 300 A VGEN = 100 mV RDC = 68 k Adjustment range 60 dB 0.775 Vrms 1.2 Vrms GRI -7.0 -6.0 -5.0 dB GR 10.5 12 13.5 dB 40.7 41.7 42.7 dB 0.5 dB 25 k DTMF-amplifier Test Conditions: IMP = 2 mA DTMF amplification IL = 15 mA VDTMF = 8 mV Mute active GD Gain deviaton IL = 15 mA Tamb = -10 to +60C GD Input resistance RGT = 15 k Ri Distortion of DTMF signal IL 15 mA VL = 0 dBm dD 2 % Gain deviation with current IL = 15 to 100 mA GD 0.5 dB 3.6 V 15 20 Supply Voltages, VMIC = 10 mV, Tamb = -10 to +60C IL = 8 mA RDC = 130 k IMP = 1 mA VMP Maximum output voltage VRING = 20V Vout Input impedance in speech mode f = 300 Hz to 3400 Hz IL > 15 mA VTIP/RING = 1.5 Vrms VMP 3.1 3.4 Ringing Part, IVMP = 1 mA 6 Ri 25 50 Vpp k U4037B-N 4742B-CORD-11/05 U4037B-N 5. Electrical Characteristics (Continued) f = 1 kHz, 0 dBm = 775 mVrms, IMP = 2 mA, Tamb = 25C, Zear = 68 nF + 100, ZM = 68 nF, unless otherwise specified Parameters Ringing part: Ringer output voltage Test Conditions Symbol Min. f = 25 Hz, CBUZ = 50 nF VTIP/RING = 63 Vrms Vout 28 VTIP/RING = 45 Vrms Vout VTIP/RING = 25 Vrms Vout Volume adjustment steps Zener diode voltage IRING = 25 mA Typ. Max. Unit Vpp 18 Vpp 7 Vpp 11 10 01 00 0 -6 -12 -24 dB VRINGmax 28.5 V 9 A PD Input PD input current PD active, IL > 14 mA, VPD = VMP Ipd Input voltage PD = active PD = inactive Vpd Vpd Voltage drop at VL PD = active IL = 14 mA IL = 100 mA VL VL 1.5 1.9 V Internal current comsumption at VB VB = 3.5V PD = active, IL = 0 mA IB 300 A 2 0.3 V 7 4742B-CORD-11/05 6. Ordering Information Extended Type Number Package Remarks U4037B-NFLY SO24 Pb-free U4037B-NFLG3Y SO24 Taped and reeled, Pb-free 7. Package Information Package SO24 Dimensions in mm 9.15 8.65 15.55 15.30 7.5 7.3 2.35 0.25 0.10 0.4 1.27 24 13.97 0.25 10.50 10.20 13 technical drawings according to DIN specifications 1 8 12 U4037B-N 4742B-CORD-11/05 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel: (33) 2-40-18-18-18 Fax: (33) 2-40-18-19-60 ASIC/ASSP/Smart Cards 1150 East Cheyenne Mtn. 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