U3761MB-T ATMEL [ATMEL Corporation], U3761MB-T Datasheet

Page 1

... 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 possible with reduced performance ...

Page 2

... 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. U3761MB-T 2 4744A–CORD–09/03 ...

Page 3

... MFIND 11 34 GND 12 33 MIC MIC 2 14 MICO RDC 17 27 TIN MUTE PRIND RECIN 23 22 U3761MB Mask DP MODE KT HKS NC TEST VDD OUT RCK VRING VRIAC AGC THA ST CLIM RECO 1 RECO 2 3 ...

Page 4

... Earth Earth key (604 ms high pulse pause) Toggle flipflop input 6 HFI Input with 200 kW pull-down resistor HFI triggers HFO with each LOW/HIGH edge 7 HFO Output will be toggled by each LOW/HIGH edge at HFI U3761MB-T 4 Configuration VDD C1 VDD PD VDD C2-C4 VDD PD = Protection Device VDD ...

Page 5

... Reset by on hook condition Maximum voltage at MFIND = 5 GND Ground 13 MIC 1 Inverting input of microphone amplifier 14 MIC 2 Non-inverting input of microphone amplifier 4744A–CORD–09/03 699 +0.28 766 -0.52 848 -0.47 940 -0.10 +0.57 -0.30 -0.34 U3761MB-T Configuration VDD XT VDD PD VDD XT VDD PD VDD MFO VDD PD VDD MFIND MFIND 50K PD MIC1 ...

Page 6

... TIN applied to this stage. This internal voltage bias line must be connected to VL via an external resistor which dominates the AC input 19 V impedance of the circuit and should be 680 W for an 600-W I input impedance or 1.2 kW for a 900-W input impedance. U3761MB-T 6 Configuration 16K MICO ...

Page 7

... Time constant of anticlipping in transmit path. CLIM ³ 2.2 µF 25 CLIM CLIM = GND: anticlipping inactive The output of the sidetone cancellation signal, which 26 ST requires a balanced impedance times the subscriber’s line impedance to be connected to pin VL. 4744A–CORD–09/03 U3761MB-T Configuration 30K MUTE MUTE 6 PRIND 6.7V PD ...

Page 8

... This pin can be left AGC open to set AGC out of action. 29 VRIAC Ringing supply DC supply voltage for the tone ringer is limited with 30 VRING integrated Z-diode. 31 RCK RC clock oscillator for ringer U3761MB-T 8 Configuration VRIAC 140K 12K THA 20K AGC PD ...

Page 9

... Keytone output signal which is sent out in pulse dialing 37 KT mode with a keytone frequency of 582 Hz. KT sink/drive current is about 100 µ 4744A–CORD–09/03 VRING PD OUT PD VDD PD TEST HKS U3761MB-T Configuration 200 VDD VDD VDD PD VDD PD VDD VDD ...

Page 10

... DTMF mode or pulse mode on-hook state VDD Short mute during pulse dialing, active high 40 Mask During MASK an internal NPN transistor shortens VL against VI Keyboard input 44 R4 U3761MB-T 10 Configuration VDD MODE VDD PD VDD DP PD VDD MASK PD VDD R1 VDD PD VDD ...

Page 11

... D1, D2 will be dialed out, then dialing out stops b) ON/OFF-HOOK, M1 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 itself or to another memory (except redial memory) will erase the destinated memory. U3761MB ...

Page 12

... Number Store Repertory Dialing Notice (N) Cascaded Dialing U3761MB-T 12 Example: OFF/ HOOK, D1, D2, ... Dn a) ON/OFF-HOOK, R/ ON/OFF-HOOK, R/ (or Ln) D1, ... Dn copied to Mn (or Ln) but OFF/ HOOK ON/OFF-HOOK, R/ ON/OFF-HOOK, M1 OFF HOOK , ..., (or Ln) 1. D1, D2, ..., Dn will be stored in memory location only (not in redial memory) and dialed out ...

Page 13

... Figure 4. Pulse Mode Auto Dialing, t < t HKS KEY IN DP MUTE MASK MFO OSC 4744A–CORD–09/ IDP IDP t PDP Low Oscillation OHD t KRD R/P t KID IDP t PDP Low Oscillation U3761MB-T t KRD 2 t KID IDP IDP t PDP t < t OHD t t IDP IDP 13 ...

Page 14

... Figure 5. Pulse Mode Auto Dialing, t > t HKS KEY IN DP MUTE MASK MFO OSC Figure 6. DTMF Mode Normal Dialing HKS KEY KID DTMF t TD MUTE MASK DP OSC U3761MB-T 14 OHD t KRD R/P t KID IDP t PDP Low Oscillation ITP ITP ...

Page 15

... OHD t KRD R/P t KID ITP Low High Oscillation ) OHD t KRD R/P t KID ITP Low High Oscillation OFF HOOK , The pause function can be stored in the memory. 2. The pause function is executed in normal dialing and redialing. U3761MB-T t < t OHD t ITP t > t OHD , R ..., Dn' 15 ...

Page 16

... Figure 9. Pause Function HKS KEY IN DP MUTE MASK MFO OSC Pulse-to-tone (*/T) U3761MB R KID t PDP Oscillation OFF HOOK , ..., Dn , */T , D1' , D2' , ..., Dn 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 ...

Page 17

... 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. U3761MB ...

Page 18

... Figure 11. Flash Operation HKS KEY KID DP MUTE MASK MFO OSC Figure 12. Symbolic Timing Diagram: Earth Function KEY IN DP MUTE MASK EARTH U3761MB-T 18 High Oscillation t = key active in debounce KID t = key release debounce KRD t = pre-digit pause PDP t = inter-digit pause ...

Page 19

... Figure 13. Symbolic Timing Diagram: HFI, HFO Function HFI HFO Figure 14. Symbolic Timing Diagram: On Hook Debounce Time Off hook HKS XT 4744A–CORD–09/03 Figure 15. HKS Threshold Voltage 2.0 2.5 U3761MB-T On hook 165 ms switch on switch off 3.0 3.5 4.0 4.5 5 ...

Page 20

... Noise at line weighted psophometrically Sidetone reduction DTMF Amplifier Volume range d < 5% DTMF output level low frequency group Pre-emphasis between high- and low-level frequency group Total harmonic distortion relative to sum level of low and high frequency group signal U3761MB-T 20 Symbol ...

Page 21

... mA MIC rms Test Conditions HKS = U3761MB-T = 25°C, unless otherwise specified, refer amb Symbol Min. Typ. Max -0.5 0 -0 -77.5 - ...

Page 22

... Flash pause time Pause time On-hook debounce time Earth time Earth pause time Break duration Make duration Break + make duration U3761MB-T 22 Test Conditions Test Conditions MODE pin = R3 (10 pps) MODE pin = C1, C4 (10 pps) MODE pin = R1 (20 pps) MODE pin = R2 10 pps, t ...

Page 23

... Osc Osc Osc ; ; f = --------- - f = --------- - f = --------- - 320 4 5 For more information on adjusting ringer melody refer to the document “Application and Adjustment Hints”. U3761MB-T Symbol Min. Typ. I 2.1 RING RON V 5.0 5.6 ROFF f 937 1010 1H f 752 808 1L C 1000 ...

Page 24

... Figure 17. Basic Test Circuit U3761MB-T 24 4744A–CORD–09/03 ...

Page 25

... Total Harmonic Distortion (THD) æ 2 ´ ´ ç ´ ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- THD = 20 log ç è ... n = harmonics of high and low frequency group 1 n U3761MB mA mA æ ö RECO ´ (Mute = active) 20 log ---------------- - è ø ´ ´ ´ ...

Page 26

... Ordering Information Extended Type Number U3761MB-TFN U3761MB-TFNG3 Package Information Package SSO44 Dimensions in mm 0.3 0 U3761MB-T 26 Package Remarks SSO44 Tube SSO44 Taped and reeled 18.05 17.80 2.35 0.25 0.10 16 9.15 8.65 7.50 7.30 0.25 10.50 10.20 technical drawings according to DIN specifications 4744A–CORD–09/03 ...

Page 27

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 ...