Features Speech Circuit • • • • Adjustable DC Characteristic Symmetrical Input of Microphone Amplifier Receiving Amplifier for Dynamic or Piezo-electric Earpieces Automatic Line-loss Compensation Dialer • • • • • • • • • • • • • • DTMF/Pulse Switchable Pulse Dialing 66/33 or 60/40 or DTMF Dialing Selectable by Pin Selectable Flashing Duration by Key Pad Pause Function Optical Indication of Temporary DTMF Mode Keytone for Pulse Dialing Last Number Redial up to 32 Digits Three by 17 Digits Direct (One-touch) Memory Ten by 17 Digits Indirect (Two-touch) Memory Notice Function up to 32 Digits Standard Low-cost Crystal 3.58 MHz or Ceramic Resonator Handset Mute (Privacy) with Optical Indication Additional Toggle Flipflop Internal Loop Interrupt Detection Universal Telephone IC All Functions Integrated U3761MB-T Tone Ringer • • • • 2-tone Ringer Adjustable Volume RC Oscillator Adjustable Threshold Benefits • Low Number of External Components • High Quality through One IC Solution Electrostatic sensitive device. Observe precautions for handling. Description Atmel’s low-voltage telephone circuit U3761MB-T performs all the speech and line interface functions required in an electronic telephone set, a tone ringer, a pulse and DTMF dialing with redial, notice function, and 13 memories. Operation below 15 mA is possible with reduced performance. Rev. 4744A–CORD–09/03 2 5 8 4 7 A M3 4.7 V VI M2 S M1 150 kW 1 nF R4 R3 R2 R1 C4 C3 C2 C1 HFO HFI RCK TEST MUTE MFIND # R/P N 9 6 3 F1 F2 F3 E */T 0 2 1 Important note: Application examples have not been examined for series use or reliability, and no worst case scenarios have been developed. Customers who adapt any of these proposals must carry out their own testing and be convinced that no negative consequences arise from the proposals. KT Earth XT XT Toggle flipflop Keyboard interface Clock generator 3.58 MHz Clock signal oscillator Location latch RAM 4.7 V Mask 470 nF Divider Divider Supply Bandgap reference Tone signal generator Power on reset MIC2 Comparator with hysteresis AGC current generator Supply current regulator + MICO 220 nF MPSA42 220 nF Microphone amplifier MIC1 Mute control MFO 18 kW D/A converter VDD 220 µF DP Pulse control logic Next to VDD and GND ROW & column programmable counter Control logic PRIND LED Data latch & decoder MODE Read - write counter HKS to key board matrix 1 kW VI Transmit amplifier Control function Control function TIN 33 kW HKS 1a Receiving amplifier Receiver attenuation Sidetone amplifier CL 2.2 nF 2N5401 3 kW 100 kW 2.4 kW THA 47 nF 3.3 nF 1W 39 W 10 µF 12 kW 10 kW 680 W 470 W 100 W 10 kW VRIAC OUT VRING VI RDC AGC RECO2 RECO1 2.2 µF RECIN ST VL CLIM 2.2 µF HKS 1b 220 kW 1 µF 100 µF 300 W 1.8 kW 330 W 13 V/ 1W 75 V 5 MW Ring Tip Figure 1. Block Diagram U3761MB-T 4744A–CORD–09/03 U3761MB-T Pin Configuration Figure 2. Pinning SSO44 C1 1 44 R4 C2 2 43 R3 C3 3 42 R2 C4 4 41 R1 Earth 5 40 Mask HFI 6 39 DP HFO 7 38 MODE XT 8 37 KT 9 36 HKS MFO 10 35 NC MFIND 11 34 TEST GND 12 33 VDD MIC 1 13 32 OUT MIC 2 14 31 RCK MICO 15 30 VRING VL 16 29 VRIAC RDC 17 28 AGC TIN 18 27 THA VI 19 26 ST MUTE 20 25 CLIM PRIND 21 24 RECO 1 RECIN 22 23 RECO 2 U3761MB-T XT 3 4744A–CORD–09/03 Pin Description Pin Symbol Function 1 C1 2 C2 3 C3 Configuration VDD C1 VDD Keyboard input PD VDD 4 C4 C2-C4 VDD PD = Protection Device VDD 5 Earth Earth key (604 ms high pulse, 1 s pause) EARTH PD VDD HFI Toggle flipflop input Input with 200 kW pull-down resistor HFI triggers HFO with each LOW/HIGH edge HFI VDD 200K 6 PD VDD 7 HFO Output will be toggled by each LOW/HIGH edge at HFI HFO PD 4 U3761MB-T 4744A–CORD–09/03 U3761MB-T Pin Description Pin Symbol Function Configuration VDD XT VDD 8 XT 9 XT A built-in inverter provides oscillation with an inexpensive 3.579545-MHz crystal or ceramic resonator PD VDD XT VDD PD 10 MFO Output of DTMF DTMF output frequency Specified (Hz) Actual (Hz) Error (%) R1 697 699 +0.28 766 -0.52 R2 770 R3 852 848 -0.47 940 -0.10 R4 941 1216 +0.57 C1 1209 C2 1336 1332 -0.30 1472 -0.34 C3 1477 VDD MFO VDD PD VDD 11 MFIND During the temporary DTMF mode the output switches to low Reset by on hook condition Maximum voltage at MFIND = 5.5 V MFIND MFIND PD 12 GND Ground VI 1V 50K 13 MIC 1 Inverting input of microphone amplifier MIC1 14 MIC 2 Non-inverting input of microphone amplifier MIC2 PD 50K 1V VI PD 5 4744A–CORD–09/03 Pin Description Pin Symbol Function Configuration VI 15 MICO Transmit pre-amp output which is normally capacitively coupled to Pin TIN 1V 16K MICO PD VL 16 V 16 VL Positive supply voltage input to the device. The current through this pin is modulated by the transmit signal. PD RDC PD 17 RDC An external resistor (1 W) is required from this pin to GND to control the DC input impedance of the circuit. It has a nominal value of 39 W for low-voltage operation. Values up to 100 W may be used to increase the available transmit output voltage swing at the expense of low-voltage operation. VL AGC PD RDC PD 1V 18 TIN Input to the line output driver amplifier. Transmit AGC applied to this stage. 5.6K TIN 16 V PD 19 6 VI This internal voltage bias line must be connected to VL via an external resistor which dominates the AC input impedance of the circuit and should be 680 W for an 600-W input impedance or 1.2 kW for a 900-W input impedance. VI 16 V PD U3761MB-T 4744A–CORD–09/03 U3761MB-T Pin Description Pin 20 21 Symbol Function MUTE PRIND 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 Configuration VBG 30K MUTE MUTE 6.7 V PD VL PRIND 6.7V PD 22 RECIN Receive amplifier input. The receiving amplification is regulated by an AGC. 60K RECIN VL 23 24 RECO2 RECO1 Output of the receive amplifier. Dynamic transducers with a minimum impedance of 100 W can be directly driven by these outputs. 60K RECO2 RECO1 1V 6.7 V PD VL 25 CLIM Time constant of anticlipping in transmit path. CLIM ³ 2.2 µF CLIM = GND: anticlipping inactive IDC CLIM 6V PD 26 ST 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. ST 16 V PD 7 4744A–CORD–09/03 Pin Description Pin Symbol Function Configuration VRIAC 27 THA 140K 12K Ringer threshold adjustment THA 1V 20K 6V 6V PD VL 28 AGC The range of transmit and receive gain variations between short and long loops may be adjusted by connecting a resistor RAGC from this pin to (GND). This pin can be left open to set AGC out of action. AGC PD RDC 29 VRIAC Ringing supply PD 70K VRIAC 10K 50 V PD VRING 30 VRING DC supply voltage for the tone ringer is limited to 30 V with integrated Z-diode. 30 V 6.5K 200 PD OUT 50 V PD 3.4 V 31 RCK 0.8 V RC clock oscillator for ringer RCK 6V 6V PD 8 U3761MB-T 4744A–CORD–09/03 U3761MB-T Pin Description Pin Symbol Function Configuration VRING 32 OUT Buzzer output 30 V 200 6.5K PD OUT 50 V PD VL 33 VDD Supply output for dialer part 6V VDD 6V PD VDD 6.25 k VDD 34 Test Test input with 6.25 kW pull-up resistor TEST VDD PD 35 36 NC HKS Not connected Hook switch input HKS = 0: On-hook state. Chip in sleep mode, no operation (external pull-down resistor recommended) HKS = 1: Off-hook state. Chip enable for normal operation IHKS £ 0.5 mA VDD HKS PD VDD 37 KT Keytone output signal which is sent out in pulse dialing mode with a keytone frequency of 582 Hz. KT sink/drive current is about 100 µA at VDD = 2.5 V KT VDD PD 9 4744A–CORD–09/03 Pin Description Pin 38 Symbol Function MODE Pulling MODE pin to: C3: tone mode with 87 ms burst time and 140 ms pause C4: tone mode with 87 ms DTMF burst and 87 ms pause R1: pulse mode with 20 pps, Make/Break = 40/60 R2: pulse mode with 20 pps, Make/Break = 33/66 R3: pulse mode with 10 pps, Make/Break = 40/60 R4: pulse mode with 10 pps, Make/Break = 33/66 C1: pulse mode with 10 pps, Make/Break = 33/66 and temp. DTMF with 87 ms DTMF burst, 140 ms pause MODE pin pulled to R4: with temporary DTMF, 87 ms DTMF burst and 87 ms pause Configuration VDD MODE VDD PD VDD 39 DP Pulse dialing output. Flash key will cause DP to be active in either DTMF mode or pulse mode. In on-hook state is DP = VDD DP PD VDD 40 Mask Short mute during pulse dialing, active high During MASK an internal NPN transistor shortens VL against VI. MASK PD 41 R1 42 R2 43 R3 VDD R1 VDD Keyboard input PD VDD 44 R4 R2-R4 VDD PD 10 U3761MB-T 4744A–CORD–09/03 U3761MB-T Keyboard Operation ^← Normal Dialing C1 C2 C3 C4 1 2 3 S 4 5 6 7 8 9 */T 0 F1 F2 M1 R1 M2 R2 A M3 R3 # R/P N R4 F3 E ^ • S: Store function key • A: Indirect repertory dialing function key (LN 0 to 9) • R/P: Redial and pause function key • N: Notice function • */T: * function; pulse-to-tone function • M1 to M3: One-touch memory • F1, F2, F3: Flash keys OFF HOOK , D1 D2 , ..., Dn 1. D1, D2, ..., Dn will be dialed out. 2. Dialing length is unlimited, but redial is inhibited if length oversteps 32 digits. 3. If redialing length oversteps 32 digits, the redialing function will be inhibited. Redialing OFF HOOK HOOK , R/P , D1 , D2 , ..., Dn BUSY, Come ON HOOK ,OFF The R/P key can execute the redial function only as the first key-in after off-hook; otherwise, it executes the pause function (3.6 s). Keys stored in redial memory: 0 to 9, #, R/P, A, M1, M2, M3, N, * (only tone mode) Characters F1, F2, F3, Earth, (* in pulse mode) can only be stored in Mn, Ln and N memory. Characters F1, F2, F3, Earth, (* in pulse mode) will not be dialled out from redial memory; dialling out was stopped, when recognizing one of the above characters. Example: OFF/ HOOK, D1, D2, F1, D4, D5, S, S, M1 a) ON/OFF-HOOK, R/P b) ON/OFF-HOOK, M1 only D1, D2 will be dialed out, then dialing out stops D1, D2, F1, D4, D5 will be dialed out Content of redial memory can be copied to Mn, Ln, N; but copying memory Mn, Ln, N to itself or to another memory (except redial memory) will erase the destinated memory. 11 4744A–CORD–09/03 Example: OFF/ HOOK, D1, D2, ... Dn a) ON/OFF-HOOK, R/P, N. D1, ... Dn copied to N b) ON/OFF-HOOK, R/P, S, S, Mn (or Ln) D1, ... Dn copied to Mn (or Ln) but Number Store OFF/ HOOK, M1 content of M1 will be dialed out a) ON/OFF-HOOK, R/P, S, S, M2 b) ON/OFF-HOOK, M1, S, S, M2 not possible, M2 will be erased not possible, M2 will be erased OFF HOOK , D1 , D2 , ..., Dn , S , S , Mn (or Ln) 1. D1, D2, ..., Dn will be stored in memory location only (not in redial memory) and dialed out. OFF HOOK S , D1 , D2 , ..., Dn , S , Mn (or Ln) 2. D1, D2, ..., Dn will be stored in memory location but will not be dialed out. 3. R/P and */T keys can be stored as a digit in memory, also F1, F2, F3, Earth. In store mode, R/P is the pause function key; */T is the pulse-to-tone function key. 4. The store mode is released after the store function is executed or when the state of the hook switch is changed. 5. Number store can be linked without going ON/OFF-Hook Example: OFF/HOOK Repertory Dialing Notice (N) S, D1, D2, ... Dn, S, M1 storing D1, D2, ... Dn to M1 S, D1', D2', ... Dn', S, M2 ... storing D1', D2', ... Dn' to M2 1. OFF HOOK , Mn 2. OFF HOOK , A OFF HOOK D1 , , D2 Ln , ..., Dn , N 1. If the dialing of D1 to Dn is finished, pressing the N key will cause D1 to Dn to be copied to the N memory. 2. Pressing key N again, after D1, D2, ... Dn was copied to N, N will be dialed out again OFF HOOK , N 3. D1 to Dn will be dialed out after the N key is pressed. 4. Notice function is valid as first key only. Cascaded Dialing 1. Normal dialing + Repertory dialing + Normal dialing 2. Repertory dialing + Normal dialing + Normal dialing 3. Redialing + Normal dialing + Repertory dialing 4. Redialing is valid as first key-in only. 12 U3761MB-T 4744A–CORD–09/03 U3761MB-T Figure 3. Pulse Mode Normal Dialing HKS tKRD KEY IN 3 4 2 2 tKID tKID DP BM tIDP BM tIDP tPDP tIDP tPDP tIDP MUTE MASK Low MFO Oscillation OSC Figure 4. Pulse Mode Auto Dialing, t < tOHD HKS tKRD KEY IN t < tOHD R/P tKID DP BM tPDP tIDP BM tIDP tIDP MUTE MASK MFO OSC Low Oscillation 13 4744A–CORD–09/03 Figure 5. Pulse Mode Auto Dialing, t > tOHD HKS t > t OHD tKRD KEY IN R/P tKID DP BM BM tIDP tPDP tIDP MUTE MASK Low MFO Oscillation OSC Figure 6. DTMF Mode Normal Dialing HKS tKRD KEY IN 3 4 2 5 tKID DTMF tTD tITP tITP tITP MUTE MASK DP OSC 14 Low High Oscillation U3761MB-T 4744A–CORD–09/03 U3761MB-T Figure 7. DTMF Mode Auto Dialing (t < tOHD) HKS tKRD KEY IN t < tOHD R/P tKID DTMF tTD tITP tITP MUTE Low MASK High DP Oscillation OSC Figure 8. DTMF Mode Auto Dialing (t > tOHD) HKS tKRD KEY IN t > t OHD R/P tKID DTMF tTD tITP MUTE Low MASK High DP Oscillation OSC Access Pause OFF HOOK , D1 , D2 , R/P , D3 , ..., Dn' 1. The pause function can be stored in the memory. 2. The pause function is executed in normal dialing and redialing. 15 4744A–CORD–09/03 Figure 9. Pause Function HKS KEY IN tKID 2 R/P 3 tIDP DP tPDP tPDP MUTE tP MASK Low MFO Oscillation OSC Pulse-to-tone (*/T) OFF HOOK , D1 , D2 , ..., Dn , */T , D1' , D2' , ..., Dn' 1. If the mode switch is set to pulse mode, then the output signal will be: D1, D2, ..., Dn, Pause (3.6 s), D1', D2' ,..., Dn' (Pulse) (Tone) 2. If the mode switch is set to tone mode, then the output signal will be: D1, D2, ..., Dn, (Tone) * , D1', D2', ..., Dn' (Tone) (Tone) 3. The dialer remains in tone mode when the digits have been dialed out and can be reset to pulse mode by going on-hook only. 4. ON/OFF-HOOK, R/P D1, D2, Dn dialed out, then further dialing out stops and remains in pulse mode, when dialling from redial memory. 5. If characters are stored in Mn, Ln or N, dialing out will be the same in pulse mode as point 1. 16 U3761MB-T 4744A–CORD–09/03 U3761MB-T Figure 10. Pulse-to-tone Operation HKS KEY IN tKID 2 */T 3 DP tPDP tIDP MUTE tP MASK MFO Oscillation OSC MFIND Flash (F1 or F2 or F3) OFF HOOK , Fn 1. The dialer will execute a flash break and the entire flash pause time will elapse before the next digits are dialed out. 2. The flash key can be stored as a digit in the memory. Only one flash, however, will be released to the users. 3. The system will return to the initial state after the flash pause time has elapsed. 17 4744A–CORD–09/03 Figure 11. Flash Operation High HKS KEY IN F F t KID 3 t FB DP t FP t FP MUTE MASK MFO t ITP Oscillation OSC tKID = key active in debounce tKRD = key release debounce tPDP = pre-digit pause tIDP = inter-digit pause tTD = DTMF output duration tITP = intertone pause tFB = flash break time tFP = flash pause time tP = pause time Figure 12. Symbolic Timing Diagram: Earth Function KEY IN DP MUTE MASK Low EARTH 18 U3761MB-T 4744A–CORD–09/03 U3761MB-T Figure 13. Symbolic Timing Diagram: HFI, HFO Function HFI HFO Figure 14. Symbolic Timing Diagram: On Hook Debounce Time Off hook On hook HKS XT 165 ms Figure 15. HKS Threshold Voltage HKS Threshold (% of VDD ) 60 55 50 switch on 45 40 35 switch off 30 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VDD (V) 19 4744A–CORD–09/03 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 14 V VDC 5.5 V DC voltage at pins 1 to 11 and 33 to 44 Junction temperature Tj 125 °C Ambient temperature Tamb -25 to +75 °C Storage temperature Tstg -55 to +150 °C Total power dissipation, Tamb = 60°C, SSO44 Ptot 0.9 W RthJA 70 K/W Junction ambient, SSO44 Note: ESD withstand voltage 1 kV according to ESD standard S5.1 (HBM) Electrical Characteristics: Speech Circuit Reference point pin GND, f = 1000 Hz, 0 dBm = 775 mVrms, RDC = 39 W/1 W, Tamb = 25°C, unless otherwise specified, refer to "Basic Test Circuit". CLIM = GND Parameters Test Conditions Symbol Min. Line voltage IL = 8 mA IL = 20 mA IL = 73 mA IL = 100 mA VL Input resistance Ri Ri 45 Gain IL = 20 mA, S5 = open Gs 46.8 Gain change with current IL = 20 to 60 mA, RAGC = infinite DGS -0.5 Gain deviation Tamb = -10 to +60°C, IL = 20 mA DGS -0.5 Line-loss compensation RAGC = 12 kW, IL = 73 mA DGs -7 3.6 5.9 6.9 Typ. Max. Unit 4.1 7.2 8.2 V V V V 80 120 kW 47.8 48.8 dB 0.5 dB 0.5 dB -4.8 dB 2 % 1.4 3.85 6.55 Transmit and Sidetone Distortion at line VL = 0.775 Vrms IL = 20 mA, S5 = open Maximum output voltage at line d £ 5% IL = 20 mA, Vmic = 10 mV, CLIM = 2.2 µF, S1 = open Attack time transmit anticlipping -6 dt VLmax 1.2 dBm CLIM = 2.2 µF tatt 3.5 ms Noise at line weighted psophometrically IL > 20 mA, GS = 48 dB no Sidetone reduction IL ³ 20 mA GSTA 10 15 -72 dBmp 20 dB DTMF Amplifier Volume range d < 5% Single tone, IL ³ 20 mA VL 1.3 DTMF output level low frequency group IL = 20 mA, S5 = closed Tamb = -5°C to +60°C VL -7.6 Pre-emphasis between high- and low-level frequency group PPRE = PHLG - PLLG, S5 = closed, Tamb = -5°C to +60°C PPRE 1.9 Total harmonic distortion relative to sum level of low and high frequency group signal IL ³ 20 mA, measured at pin MFO THD 20 dBm -4.6 dBm 2.5 3.1 dB -33 -25 dBr U3761MB-T 4744A–CORD–09/03 U3761MB-T Electrical Characteristics: Speech Circuit (Continued) Reference point pin GND, f = 1000 Hz, 0 dBm = 775 mVrms, RDC = 39 W/1 W, Tamb = 25°C, unless otherwise specified, refer to "Basic Test Circuit". CLIM = GND Parameters Test Conditions Symbol Min. GR Typ. Max. Unit 3 5 dB Receiving Amplifier Gain IL ³ 20 mA Gain change with current IL = 20 to 60 mA RAGC = infinite DGR -0.5 0.5 dB Gain deviation Tamb = -10 to +60°C IL = 20 mA DGR -0.3 0.7 dB Line-loss compensation IL = 73 mA DGR -7 -6 -4.7 dB Receiving noise at earphone weighted psophometrially IL = 73 mA ni -77.5 -71 dBm Gain change when muted IL ³ 20 mA GRM 24 29 34 dB Output voltage push-pull IL ³ 20 mA, Zear = 68 nF, 100 W in series, d £ 2% VRECO 0.8 0.9 Ear protection differential IL = 40 mA, Vgen = 4 Vrms, Zear = 68 nF + 100 W Vear 1.3 1.6 Vrms 2.5 Vrms 6.3 V Supply Voltage (For Internal Use Only) Output voltage Note: Output must be limited externally to 5.5 V maximum IL ³ 20 mA dialing mode VDD 2.0 Available current for peripherals IL ³ 20 mA dialing mode IDD 150 µA Transmit Maximum output voltage swing at line IL = 20 mA, VMIC = 50 mVrms VL max Mute suppression transmit with privacy function IL = 20 mA GSPRIV 60 Symbol Min. 3.4 4 Vpp dB DC Characteristics Dialer VDD = 2.7 V, fOSC = 3.58 MHz, all outputs unloaded, S9 closed; HKS = 1 Parameters Test Conditions Memory retention current HKS = 0, VDD = 1.0 V Typ. IMR Data retention voltage Max. Unit 0.1 µA 0.5 V DTMF distortion RL = 5 kW DP output sink current VPO = 0.5 V IPL Keyboard input drive current VI = 0 V IKD 20 µA Keyboard input sink current VI = 2.7 V IKS 500 µA Key on resistance d -30 -23 0.5 mA 5 RKON dB kW Key off resistance RKOFF 100 kW Mask sink/drive current IM H/L 0.5 mA Earth sink/drive current Ie H/L 0.5 mA 21 4744A–CORD–09/03 DC Characteristics Dialer (Continued) VDD = 2.7 V, fOSC = 3.58 MHz, all outputs unloaded, S9 closed; HKS = 1 Parameters Test Conditions Isolation resistance XT/XT Symbol Min. Riso 4.7 Typ. Max. Unit MW Maximum voltage at HKS 5.5 V Maximum input current at HKS 0.5 mA AC Characteristics Dialer VDD = 2.7 V, fOSC = 3.58 MHz, all outputs unloaded, S9 closed; HKS = 1 Parameters Symbol Min. Typ. Max. Unit Keypad active in debounce mode tKID 15 20 25 ms Key release debounce tKRD 15 20 25 ms MODE pin = R3 (10 pps) MODE pin = C1, C4 (10 pps) tPDP tPDP 37 31 40 33.3 41 33.5 ms ms MODE pin = R1 (20 pps) MODE pin = R2 tPDP tPDP Pre-digit pause Test Conditions Inter-digit pause (auto dialing) 10 pps, tIP = tIDP + tPDP 20 pps tIP tIP Make/break ratio MODE pin = R1 (20 pps), R3 10 pps) MODE pin = C1, R4 (10 pps) R2 (20 pps) M/B DTMF output duration Auto dialing, MODE = C4 MODE = C3 Inter-tone pause 20 16.65 ms ms 810 836 512 860 ms ms 40.8:60.2 40:60 39.2:60.8 % 35.6:64.4 33:67 31.2:68.8 % tTD 84 84 87 87 90 90 ms Auto dialing, MODE = C4 MODE = C3 tITP 84 135 87 140 90 147 ms Flash break time F1 F2 F3 C1 connected to GND C2 connected to GND C3 connected to GND tFB 95 245 590 98 250 604 101 255 610 ms ms ms Rise time of leading edge at HKS 20 to 70% of VDD 10 ms Flash pause time F1, F2, F3 Pause time On-hook debounce time C4 connected to GND Earth time Make duration Break + make duration 22 tFP 0.9 1 1.1 s tP 3.5 3.6 3.7 s tohd 145 165 185 ms tet 604 ms tpt 0.9 1 1.1 s MODE pin = R3 MODE pin = C1, R4 tB 57.6 63 60 66.7 62.4 69 ms ms MODE pin = R1 (20 pps) MODE pin = R2 tB MODE pin = R3 MODE pin = C1, R4 tM MODE pin = R1 (20 pps) MODE pin = R2 tM MODE pin = C1, R3, R4 tP MODE pin = R1, R2 (20 pps) tP Earth pause time Break duration trHKS 30 33.35 38 31 40 33.3 95 20 16.65 100 50 ms ms 41 35 ms ms 105 ms ms ms ms U3761MB-T 4744A–CORD–09/03 U3761MB-T Electrical Characteristics Tone Ringer fRCK = 4 kHz, VRING = 20 V, Tamb = 25°C, reference point GND, unless otherwise specified Parameters Test Conditions Symbol Min. Supply current, outputs open Switch-on threshold Max. Unit VRIAC = 20 V IRING 2.1 VRIAC, THA = open VRON 8 9 3.8 mA 10 V Switch-off threshold VRIAC VROFF 5.0 5.6 6.5 V Ringing frequency R = 150 kW, C = 1 nF VRIAC > VRON f1H f1L 937 752 1010 808 1083 868 Hz Hz Range of external components for R/C oscillator C 1000 2200 pF R 50 330 kW Audio sequence frequency f2 11.5 12.5 14.0 Hz 21 23 Output voltage swing VRing = 25 V, Cout = 68 nF Vout Turn-off delay See Figure 15 toff Note: Typ. Vpp 65 100 ms Max. current into internal zener diode at pin VRING = 20 mA Figure 16. Turn-off Delay Time Volt VRING 0 t VRIAC 0 t OUT Melody t 0 Note toff The oscillator frequency is defined by R and C at pin RCK. 1 f Osc » ------------------------------------------------------------------1.594 ´ C ´ [ R + 3809 W ] The audio sequence frequency f2 and the ratio of low frequency f1L and high frequency f1H are derived from the oscillator by internal deviders. So f2, f1H and f1L are given by: f Osc f Osc f Osc f 2 = --------- ; f 1H = --------- ; f 1L = --------320 4 5 For more information on adjusting ringer melody refer to the document “Application and Adjustment Hints”. 23 4744A–CORD–09/03 1n 150k 2.2 µ S1 3.58 MHz CLOCK IN To tester To tester To tester IN OUT IN OUT OUT OUT I/O IN IN IN IN IN IN IN IN S6 MIC2 U3761MB MIC1 25k MFO MICO S5 TIN 220n VL GND TEST HFI HFO RCK MUTE MASK MFIND EARTH CLIM R1 R2 R3 R4 C1 C2 C3 C4 THA OUT VRIAC VRING PRIND RDC AGC RECO2 RECO1 VI RECIN VDD 25k 8.2k XT b a 1µ ST HKS IN S9 VDD 220 µ VMIC To tester XT MODE I/O S11 I/O KT DP OUT 24 I/O To tester S8 1µ 68n 39 12k VRECO 4.7k VGEN 100 mV 330 2.2 µ 47n 2.2n 1.5k 600 100 µ CL S7 VRIAC a b OUT VRING VL IL 13 V To tester 100 µ 620 VGEN 300 mV/1 kHz Figure 17. Basic Test Circuit U3761MB-T 4744A–CORD–09/03 U3761MB-T Equations for Electrical Characteristic Parameters of the Speech Circuit The equations refer to the basic test circuit. If not otherwise specified, the switches in the basic test circuit are inactive. Transmit Gain VL GS = 20 ´ log æ ------------ö è V MICø VMIC = 3 mV/1 kHz, S5 = open Line-loss Compensation Transmit DGS = GS (at IL = 73 mA) - GS (at IL = 20 mA) TX-mode: VMIC = 3 mV/1 kHz, S5 = open Line-loss Compensation Receive DGR = GR (at IL = 73 mA) - GR (at IL = 20 mA) RX-mode: Vgen = 300 mV/1 kHz, S7b Receiving Gain VRECO GR = 20 ´ log æ -----------------ö è VL ø RX-mode: Vgen = 300 mV/1 kHz, S7b Sidetone Reduction VL GSTA = 20 ´ log æ -----------------ö (in TX-mode) + GR è V RECOø TX-mode: VMIC = 3 mV/1 kHz, S5 = open Input Impedance of Microphone Amplifier 50 k Ri = -----------------------------------------------V L(S6 = closed) æ --------------------------------- – 1ö èV ø L(S6 = open) TX-mode: VMIC = 3 mV/1 kHz, S5 = open Gain Change when Muted V RECO VRECO GRM = 20 ´ log æ -----------------ö (Mute = inactive) - 20 ´ log æ -----------------ö (Mute = active) è VL ø è VL ø Vgen = 100 mV/1 kHz, S5 = open, S8 = open Total Harmonic Distortion (THD) æ n ´ U 2 + n ´ U 2 + n ´ U 2 + n ´ U 2 + ...n ´ U 2 + n ´ U 2ö 1 LG 1 HG 2 LG 2 HG n LG n HG THD = 20 ´ log ç -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------÷ ç ÷ 2 2 ULG + UHG è ø n1, ... nn = harmonics of high and low frequency group 25 4744A–CORD–09/03 Ordering Information Extended Type Number Package Remarks U3761MB-TFN SSO44 Tube U3761MB-TFNG3 SSO44 Taped and reeled Package Information 9.15 8.65 Package SSO44 Dimensions in mm 18.05 17.80 7.50 7.30 2.35 0.3 0.25 0.10 0.8 16.8 44 0.25 10.50 10.20 23 technical drawings according to DIN specifications 1 26 22 U3761MB-T 4744A–CORD–09/03 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. Blvd. Colorado Springs, CO 80906, USA Tel: 1(719) 576-3300 Fax: 1(719) 540-1759 Biometrics/Imaging/Hi-Rel MPU/ High Speed Converters/RF Datacom Avenue de Rochepleine BP 123 38521 Saint-Egreve Cedex, France Tel: (33) 4-76-58-30-00 Fax: (33) 4-76-58-34-80 Zone Industrielle 13106 Rousset Cedex, France Tel: (33) 4-42-53-60-00 Fax: (33) 4-42-53-60-01 1150 East Cheyenne Mtn. Blvd. Colorado Springs, CO 80906, USA Tel: 1(719) 576-3300 Fax: 1(719) 540-1759 Scottish Enterprise Technology Park Maxwell Building East Kilbride G75 0QR, Scotland Tel: (44) 1355-803-000 Fax: (44) 1355-242-743 Literature Requests www.atmel.com/literature Disclaimer: Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company’s standard warranty which is detailed in Atmel’s Terms and Conditions located on the Company’s web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel’s products are not authorized for use as critical components in life support devices or systems. © Atmel Corporation 2003. All rights reserved. Atmel ® and combinations thereof are the registered trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be the trademarks of others. Printed on recycled paper. 4744A–CORD–09/03