Data Sheet AS2533...6 Multi-Standard CMOS Single Chip Telephone IC with Dual Soft Clipping ® Austria Mikro Systeme International AG General Description Key Features The AS253x is a CMOS integrated circuit that contains all the functions needed to form a high performance electronic telephone. ❑ Line/speech circuit, LD/MF repertory dialler and tone ringer on one 28 pin CMOS chip ❑ Operating range from 13 to 100 mA (down to 5 mA with reduced performance) ❑ Soft clipping to avoid harsh distortion ❑ Volume control of receive signal ❑ Line loss compensation selectable by pin option ❑ Low noise (max. - 72 dBmp) ❑ Real or complex impedance ❑ NET 4 compatible ❑ LD/MF switchable dialling ❑ Pacifier tone during programming ❑ 31 digit last number redial ❑ Repertory memories (not AS2534), 4 direct/10 indirect (AS2533/6), 12 direct (AS2535) ❑ Repeat dialling by busy or engaged (not AS2535) ❑ Sliding cursor protocol with comparison ❑ Pause key for access pause or wait function ❑ 3 flash keys, 100 ms, 280 ms and 375/600 ms ❑ On chip MF filter (CEPT CS 203 compatible) ❑ Ring frequency discrimination ❑ 3-tone melody generator The device incorporates LD/MF repertory dialling, melody generation, ring frequency discrimination and a high quality line/speech circuit. A RAM is on chip for a 31 digit last number redial and memories (not AS2534) each containing up to 21 digits/ data. The sliding cursor procedure makes the LNR function easy to use under various PABX systems. Also centrex keys (not AS2535) are provided. The device incorporate a volume control for the earpiece. The volume can be controlled by the VOL key (+ 5.4 dB) or by the –/+ keys (+8.1 dB/-5.4 dB in 5 steps). The versatility of the circuit is provided by pin options and a few external components. This allows easy adaptation to different PTT requirements. Package Available in 28 pin SOIC or DIP. Block Diagramme La Z2 ZBAL Z1 Lb LI CI RI LS STB LED AGND RO CS LINE ADAPTATION POWER EXTRACTION DC MASK LINE CURRENT SENSE SOFT CLIP AGC VDD VDD M2 M1 Vss MO AS253x MELODY SEQUENCER R4 MUTE TONE GENERATOR RAM R3 DIALLER FCI RING FREQUENCY DISCRIMINATION CONTROL LOGIC HS/DP R2 R1 OSC LLC OSC MFL MODE C1 C2 C3 C4 3.58 MHz LLC Hi LLC Lo LLC Off AGND Rev. 7 1 KEY PAD July 1998 Data Sheet AS2533...6 Pin Description Pin # Symbol Function 23 24 M1 M2 Microphone Inputs Differential inputs for the microphone (electret). 3 RO Receive Output This is the output for driving a dynamic earpiece with an impedance of 140 to 300 Ω. 5 AGND Analogue Ground This is the analogue ground for the amplifiers. 28 RI 6 STB 1 LS Line Current Sense Input This is the input for sensing the line current. 27 LI Line Input This input is used for power extraction and line current sensing. 25 CS Current Shunt Control Output This N-channel open drain output controls the external high power shunt transistor for the modulation of the line voltage and for shorting the line during make period of pulse dialling. 4 VDD Positive Voltage Supply This is the supply pin for the circuit. 26 VSS Negative Power Supply 8 MO Melody Output PDM output of the melody generator for tone ringing. Hi-Z when not active. 21 FCI Frequency Comparator Input This is a Schmitt trigger input for ring frequency discrimination. Disabled during off-hook. 10 HS/DP Hook Switch Input and Dial Pulse Output This is an I/O that is pulled high by the hook switch when off-hook and an open drain pulls it low during break periods of pulse dialling and flash. 11 OSC Oscillator Input Pin for ceramic resonator (3.58 MHz). Recommended: Murata CSA 3.58MG312AM. 9 LLC Line Loss Compensation Select pin for line loss compensation (see also figure 4 to 7). LLC = AGND: 20 - 50 mA LLC = VDD: 45 - 75 mA LLC = VSS: none. 22 LED LED Output Driver Output for driving an LED that will be flashing when in Programme/Mute state. Receive Input This is the input for the receive signal. Side Tone Balance Input This is the input for side tone cancellation. Continues… Rev. 7 2 July 1998 Data Sheet AS2533...6 Pin Description cont´d Pin # Symbol 12 MODE Function Signalling Mode Select Input Mode pin Open Function Dialling inhibited Row 1 Row 2 LD mode, 10 pps, 33/66 ms LD mode, 10 pps, 40/60 ms Row 3 Row 4 LD mode, 20 pps, 33/66 ms LD mode, 20 pps, 40/60 ms Row 5 Row 6 LD mode, 10 pps, 33/66 ms, Temp. MF with tone on first * key entry MF only, 82/82 ms Row 7 MF only, 82/160 ms During temporary MF: 82/160 ms 20 19 18 17 R1 R2 R3 R4 Keyboard Rows (see key arrangement in figure 2) 16 15 14 13 C1 C2 C3 C4 Keyboard Columns (see key arrangement in figure 2) 7 CI Complex Impedance Pin For complex impedance a capacitor should be connected to this pin. 2 MFL MF Level Setting A voltage divider connected from this pin to AGND and VSS can be used to set the DTMF level. Selection Overview Function Direct memories (one-key) Indirect memories (two-key) Repeat dialling LNR key Pause insertion by LNR key Pause (PS) key P/M or MT key Tone/Pulse (T/P) key Temperary MF by * key Centrex (A - D) keys Volume (VOL, –/+) keys Volume reset by off-hook Programming of tone ringer R3 Flash duration Rev. 7 AS2533 4 10 yes yes yes yes P/M yes yes yes yes yes yes 600 ms AS2534B 0 0 yes yes yes yes P/M yes yes yes yes no yes 600 ms 3 AS2534E 0 0 yes yes yes yes MT yes yes yes yes no no 375 ms AS2535 12 0 no yes yes no P/M no yes no yes yes yes 600 ms AS2536 4 10 yes yes yes yes P/M yes yes yes yes no yes 600 ms July 1998 Data Sheet AS2533...6 (Either VOL or +/– keys) Keyboard Connections Key closure, RON max. = 1 kohm Key open, ROFF min. = 1 Mohm C1 C2 C3 C4 R1 P/M 1 2 3 R2 4 5 6 7 R3 8 9 0 * R4 # R1 R2 R3 LNR VOL + – A B C D RP PS T/P M1 M2 M3 M4 MR Figure 2a (AS2533/6) C1 C2 C3 C4 R1 P/M 1 2 3 R2 4 5 6 7 R3 8 9 0 * R4 # R1 R2 R3 LNR VOL + – A B C D RP PS T/P For AS2534E P/M is MT key. Figure 2b (AS2534) Rev. 7 4 July 1998 Data Sheet AS2533...6 Keyboard Connections Continued (Either VOL or +/– keys) C1 C2 C3 C4 R1 P/M 1 2 3 R2 4 5 6 7 R3 8 9 0 * R4 # R1 R2 R3 LNR VOL + – M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11 M12 Figure 2c (AS2535) the device not operating is in a power down mode to save current. The CS pin is pulled to VSS in order to turn the external shunt transistor on to keep a low voltage drop at the LS pin during make periods. Power On Reset The on chip power on reset circuit monitors the supply voltage (VDD) during off-hook. When VDD rises above approx. 1.2V, a power on reset occurs which clears the RAM. AC Impedance The ac impedance of the circuit is set by external components. The impedance can be real or complex. The ac impedance is determined as follows: DC Conditions The normal operating range is from 13 mA to 100 mA. Operating range with reduced performance is from 5 mA to 13 mA (parallel operation). In the operating range all functions are operational. ZAC = 33 • Z 1 The dc value of Z1 should be 30 Ω to maintain correct dc performance. At line currents below 13 mA the AS253x provides an additional slope below 4.5V in order to allow parallel operation (see figure 13). Return loss and side tone cancellation can be determined independant of each other. The dc characteristic (excluding diode bridge) is determined by the voltage at LI and the resistor R1 at line currents above 13 mA as follows: Speech Circuit The speech circuit consists of a transmit and a receive path with dual soft clipping, mute, line loss compensation and sidetone cancellation. VLS = VLI + ILINE ⋅ R1 The voltage at LI is 4.5V in the normal operating range. Transmit The gain of the transmit path is 37 dB for 600 Ω line termination from M1/M2 to LS (see test circuit figure 10). During pulse dialling the speech circuit and other part of Rev. 7 5 July 1998 Data Sheet AS2533...6 The microphone input is differential with an input impedance of 20 kΩ. Line Loss Compensation The line loss compensation is a pin option. When it is activated, the transmit and receive gains are decreased by 6 dB at line currents from 20 to 50 mA when LLC = AGND and 45 to 75 mA when LLC = high (@ R1 = 30 Ω). The line loss compensation is disabled when LLC = low (see figure 4 and 5). The soft clip circuit limits the output voltage at LI to 2VPEAK (see figure 12). The attack time is 30 µs/6 dB and the decay time is 20 ms/6 dB. When mute is active, during dialling or after pressing the P/M key, the gain is reduced by > 60 dB. Dialling Functions Receive The gain of the receive path is 3 dB for 600 Ω line termination (test circuit figure 10). The receive input is the differential signal of RI and STB. When mute is active during dialling the gain is reduced by > 60 dB. During DTMF dialling a MF comfort tone is applied to the receiver. The comfort tone is the DTMF signal with a level that is -30 dB relative to the line signal. Valid Keys The key scanning is enabled when HS/DPN is pulled high and VDD is above VREF. A valid key is detected from the keyboard by connecting the appropriate row to the column (RON < 1 kΩ). This can be done using an n x m keyboard matrix with single contacts. Four diodes are used to extend the number of rows (see keyboard arrangement fig. 2). It is also possible to connect a µcontroller to the rows and columns (see application note AN3010). The receive gain can be changed by pressing the volume keys. The VOL key gives a +5.4 dB boost and has a toggle function, i.e. repressing the key resets the gain to default. As an alternative the +/– keys can be used. The + key increases the gain by 8.1 dB in 3 steps and the – key decreases the gain by 5.4 dB in 2 steps (total range 13.5 dB). On AS2533/5 the volume is reset to default by next off-hook and on AS2534/6 the volume setting will remain at last setting. A POR will always reset the volume to default. P/M and MT Key The P/M key (not AS2534E) is used to enter the Programme/Mute state and the MT key for muting (AS2534E only). Depressing the P/M key mutes the speech circuit and the device is in programme state. Repressing the P/M key deactivates the mute and programme state (toggle function).The MT key works in a similar way, but has no programme function. The soft clip circuit limits the voltage at the receive output (RO) to 1VPEAK (see figure 11). It prevents harsh distortion and acoustic shock. When programme/mute is activated, the LED indication is turned on (flashing: 80 ms 'on' and 1 sec 'off'). Sidetone A good sidetone cancellation is achieved by using the following equation: Dial Mode Selection The default mode (LD or MF) can be selected by the mode pin. When default LD mode is selected, a temporary change to MF can be invoked by pressing T/P key (not AS2535) or the * key (when mode pin = row 5, the MF tone is generated with the first * key entry). The circuit will revert to LD by repression the T/P key (not AS2535) or by pressing the R (R1, R2 or R3) key or by next onhook. ZBAL Z 2 = ZLINE Z 1 The sidetone cancellation signal is applied to the STB input. When MF mode is selected by the mode pin, the circuit can not be changed temporary to LD but will remain in MF mode. Z1 ZLINE ZBAL Centrex Keys (not AS2535) The alphameric keys accommodate easy use of centrex services. The A, B, C and D keys are only valid in MF mode (including temporary MF) and are not storable. Pressing one of these keys will invoke the appropriate MF tones to be transmitted. Z2 Figure 3 Side Tone Balance Rev. 7 6 July 1998 Data Sheet AS2533...6 The centrex keys are not stored in the RAM, and subsequently entered digits are buffered in FIFO. Last Number Redial LNR is a facility that allows resignalling of the last manually dialled number without keying in all the digits again. The LNR is repeatable after each off-hook. Memory Keys (not AS2534) The keys M1 to M12 are direct memory access keys and the MR key (AS2533/6 only) is used for abbreviated dialling. Memory arrangement Storable numbers Direct memory keys Indirect memories The current content of the RAM is overwritten by new entries. A manually entered number is automatically stored in the LNR RAM. The capacity of the RAM is 31 digits. If a number greater than 31 digits is entered, the LNR facility will be inhibited (until new entries < 32 digits) and further entries will be buffered in FIFO. In the on chip RAM, numbers can be stored. Each number can contain up to 21 digits (including pauses). During programming multiple pauses can be inserted by pressing the PS (not AS2535) or the LNR key. Each pause inserted within the first 5 entries will automatically be terminated after 2 seconds whereas pauses inserted after location 5 in a digit string will halt dialling and can be terminated manually by pressing the PS (not AS2535) or the LNR key. The halt function allows in-dialling to an extention on a PABX. Pauses can be inserted by pressing the PS key (not AS2535). Post dialled digits, i.e. digits manually entered after LNR has been invoked, are not stored in RAM but buffered in FIFO. Example (45678–123 is stored in M1, where – is a pause/wait and 123 the extention number): Repeat Dialling (not AS2535) The last manually dialled number can be repeated without going on-hook by pressing the RP key. If a called number is engaged, pressing the RP key will break the line for 1.6 second (to get a new dial tone) and after a pause the number will be repeated. off-hook, wait for dial tone press M1 (45678 is dialled out) await dial tone from called PABX press PS or LNR (123 is dialled out). The repeat function is enabled when prior to pressing the RP key, a number has been dialled, and it can be invoked an unlimited number of times until next on-hook. During the 1.6 second break the device is in power down mode to save current. Memory dialling is cascadable. However, the content of one memory must be dialled out before a new can be invoked. Sliding Cursor Procedure To accommodate easy and uncomplicated redialling (LNR) behind a PABX, a sliding cursor protocol is implemented. If new entries match the previous RAM contents, pressing the LNR key will dial out the remaining digits. Recall Function A recall (R1, R2 or R3 key) activation will invoke a flash (timed loop break), however, the R1 flash is never executed in LD mode. R2 and R3 will be executed independent of the mode. If there is an error in matching, the LNR will be inhibited until next on-hook, and the RAM will contain the new number. If recall is the first entry in a digit string, it will be stored in LNR RAM when digit(s) are entered after the recall. If the recall key is depressed after a digit string has been entered or dialled out, the recall will not be stored but buffered in the FIFO together with subsequently entered digit. Example (LNR content 912345, where 9 is access code): off-hook, wait for PABX dial tone press 9 and wait for external dial tone press LNR (12345 will be dialled out). If pressing the recall key is not followed by digit entries, the LNR RAM remains intact. Tone Generator The tone generator incorporates the DTMF tones, 3 basic frequencies for the tone ringer and pacifier tones. After a recall a 270 ms pause will automatically be executed. Rev. 7 AS2533/6 AS2534 AS2535 14 0 12 4 0 12 10 0 0 7 July 1998 Data Sheet AS2533...6 DTMF The DTMF generator provides 8 frequencies, namely: Low group Digit 1-2-3-A Digit 4-5-6-B Digit 7-8-9-C Digit * -0-# -D 697 Hz 770 Hz 852 Hz 941 Hz High group Digit 1-4-7- * Digit 2-5-8-0 Digit 3-6-9-# Digit A-B-C-D 1209 Hz 1336 Hz 1477 Hz 1633 Hz (not AS2535) The procedure is ended by repressing the P/M key. The default setting is digit 6, i.e. after a power on reset the device will start up with repetition rate 4 and maximum volume. If digit 0 is programmed, the tone ringer will be turned off until next off-hook where it will turn back to the last setting before 0. The programmed settings are stored in the on chip RAM. Repetition rate means that a sequence of 6 frequencies is repeated 1, 4 or 10 times within 1 second. The sequence of the frequencies is controlled by the sequence register as follows: The MF output level can be set with an external voltage divider on pin MFL. Voltage at pin MFL (2) 1.50 V (AGND) 1.27 V 1.15 V 1.03 V 0.90 V 0.70 V 0.54 V 0.42 V 0.30 V 0.18 V 0.00 V (VSS) (ZLINE = 600 ohm) Sequence DTMF Level (Low Group) -4.0 dBm -5.2 dBm -6.4 dBm -7.6 dBm -8.8 dBm -10.0 dBm -11.2 dBm -12.4 dBm -13.6 dBm -14.8 dBm -16.0 dBm The AS2534E is fixed to default settings and can not be programmed to other settings. Pacifier Tone By MF dialling the DTMF tones are provided to the earpiece as comfort tone. During programming a key entry is acknowledged by a pacifier tone of 1477 Hz. The level of the pacifier tone is approximately 60 mV at the RO output. The duration is 40 ms after every key entry in programme mode. When terminating the programme mode with the P/M key an acknowledge tone of 140 ms is provided. An invalid key entry, however, will cause a termination of the programme mode indicated by a rejection tone of 4 times 40 ms with 28 ms pauses between the tone bursts. The preemphasis is 2.6 dB. The MF tones are according to CEPT recommendations. Tone Ringer (Melody/Volume) The three basic frequencies of the melodies are: Ring Frequency Discrimination The ring frequency discriminator assures that only signals with a frequency between 13Hz and 70 Hz are regarded as valid ring signals. The time for recognising a valid ring signal is 1/f seconds, where 'f' is the ring frequency. F1 = 800 Hz, F2 = 1067 Hz, and F3 = 1333 Hz (± 5%). The repetition rate and the volume of the tone ringer melodies can be programmed by pressing P/M and # followed by a digit as follows (not AS2534E): Digit 1 2 3 4 5 6 7 8 9 0 Rev. 7 Repetition Rate 1 time (50 ms pause) 1 time (50 ms pause) 1 time (50 ms pause) 4 time s 4 times 4 times (default) 10 times 10 times 10 times None F1 F2 F3 F1 F2 F3 … When a valid ring signal is present for 73 ms continuously, the melody generator is activated and remains active as long as the ring signal is present. Volume - 16 dB - 7 dB 0 dB (max.) - 16 dB - 7 dB 0 dB (max.) - 16 dB - 7 dB 0 dB (max.) Off Once the melody generator has been started, the ring signal is continuously monitored and the melody generator is instantly turned on or off according to the momentary presence of a valid or unvalid ring signal respectively (until next POR or off-hook). 8 July 1998 Data Sheet AS2533...6 Typical Characteristics of Line Loss Compensation Fig. 4 (dB) 35 34 33 32 31 30 29 Tx Gain LLC = AGND LLC = VDD LLC = VSS f = 800 Hz ZLINE = 600Ω VLS = -10 dBm 20 DC Line Current 30 40 50 60 70 80 (mA) Fig. 5 (dB) +4 +3 +2 +1 0 -1 -2 Rx Gain LLC = AGND LLC = VSS f = 800 Hz ZLINE = 600Ω VLS = -10 dBm VOL = 0 dB (neutral) 20 Rev. 7 LLC = VDD 30 DC Line Current 40 50 9 60 70 80 (mA) July 1998 – 26dB + – 10dB + + – 0 dB ZBAL (10 x ZLINE) RO Data Sheet SC COMFORT TONES AC Model of Speech Circuit Figure 8 Rev. 7 LLC & VOLUME Z LINE 80 k STB 8k DTMF RI 10 300Ω ZREF 30Ω LI LLC & SC + 20 k ZSYN (970Ω) CS – 12dB + PRIVACY MUTE CI – 23dB + 20 k M1 M2 32.3 x ZREF AS2533...6 July 1998 AS2533...6 100 µF Data Sheet (see fig. 2) KEY PAD C2 C1 100 k MODE 56 k LLC Hi LLC Lo LLC off 3.58 MHz MFL OSC LLC OSC TONE GENERATOR HS/DP AGND CONTROL LOGIC 10 n FCI RING FREQUENCY DISCRIMINATION MELODY SEQUENCER MO VDD Vss 470 µF 220 k Rev. 7 10 µF 330 k 4148 BC547 0.68 µF 5M1 2k2 100 k 18V 5V1 1M 470 k 2N5551 220 k 220 k 47 k 10 k 10V 2SA1209 BC327 R1 30 Ω CS For further application information please refer to application note AN2201. VDD LI CI LINE ADAPTATION POWER EXTRACTION DC MASK SOFT CLIP AGC LINE CURRENT SENSE RI 15 n LS 10 µ DIALLER MUTE RAM AS253x STB 1µ 100 µ 7k5 10 n 1k8 R5 Since the AS253x is a component and not a complete system, it can not be approved as a stand alone part by the standard bodies. Hence, full conformance to any standards is depending on the application in which the AS253x is being used, and therefore, approvals by the standard bodies are the responsibility of the customer and Austria Mikro Systeme will not have tested the product to meet specific standards. 300Ω The external components might change to comply with various national PTT regulations and to interface to different transducers. AGND LED C3 C4 R2 R4 M1 R1 10 n 10 n M2 RO 10 µF 300Ω Only the components necessary for presenting the complete functions of the AS253X are included. 1k8 1k8 2k2 Complex Impedance (270 Ω + 750 Ω // 150 nF) Figure 9 R3 Typical Application 11 July 1998 Data Sheet AS2533...6 Operating Procedures Procedure Principles The procedures for utilizing the features of the AS253x are optimized out of consideration for the human factor in order to: - meet the user´s expectations - be easy to learn and relearn - not invoke any automatic functions which the user doesn´t expect - protect the user from committing critial errors, e.g. dialling wrong numbers, deleting stored numbers, etc. - be consistent, simple and usable. The following pages describe the operating procedures for the provided features. Pressing an unvalid key or key combination during programming will cause the device to abort the programme state. Pressing any key combination or sequence which is not described or defined may cause the device to enter a state or mode that does not comply with the expectation of the user. In such cases, any undesired state can be terminated at any time by going on-hook / off-hook which will generate a functional reset. Symbols STATES ENTRIES Going off-hook Idle (on-hook, no ringing) PROCESSING X sec Time out (x sec.) or Dialling (LD or MF) Going on-hook Speech mode KEY Pressing a key Storing (writing into RAM) Privacy mute Entering a number Programming False programme entry TEXT Entry according to text TEXT Processing according to text reading from memory Invalid entry TEXT Rev. 7 State according to text 12 July 1998 Data Sheet AS2533...6 Programming Tone Ringer (not AS2534E) P/M Programme State Speech circuit muted LED flashing MR Storing Numbers Digit 1 2 3 4 5 6 7 8 9 0 Repetition Rate 1 time (slow) 1 time (slow) 1 time (slow) 4 times 4 times 4 times (default) 10 times (fast) 10 times (fast) 10 times (fast) None # M1-12 Any invalid key entry will abort programme state Storing Numbers Volume - 16 dB - 7 dB 0 dB (max.) - 16 dB - 7 dB 0 dB (max.) - 16 dB - 7 dB 0 dB (max.) Off * P/M *) When digit 0 (tone ringer off) has been programmed, the device will automatically return to the previous setting (different from 0) by next off-hook. Rev. 7 13 July 1998 Data Sheet AS2533...6 Temporary MF MODE pin connected to row 1, 2, 3, 4 or 5 When MODE pin = row 5, pressing the * key also transmits the tone by MF select. The T/P key (not AS2535) can be used alternatively to the * key. RAM FIFO Pressing any other key does not change the state. T/P * D FIFO R T/P R FIFO T/P * EXIT FIFO Rev. 7 14 July 1998 Data Sheet AS2533...6 Storing Numbers (not AS2534) Key entries different to the procedure will be ignored. Exit programme mode from each state with on-hook or with the P/M key. P/M Programme State Speech circuit muted LED flashing # M1-12 MR Any invalid key entry will abort programme state Programming Tone Ringer Melodies 0-9 Entries (0-9, *, #, PS or LNR, R1, R2, R3) will be written directly into the selected memory location P/M Rev. 7 15 July 1998 Data Sheet AS2533...6 Automatic Dialling MR M1-12 LNR 0-9 or Postdialled digits are not stored but buffered in FIFO Rev. 7 16 July 1998 Data Sheet AS2533...6 Timing Diagrammes LD Dialling MUTE MASK HS/DPN tIDP tB tPDP tB tM tIDP tM tB t PDP tM LD Dialling With Access Pause MUTE MASK HS/DPN t IDP tB t PDP tB tM t AP tIDP tM tB t PDP tM MF Dialling MUTE MASK HS/DPN TONE tTD tITP tTD tITP tAP t TD tITP Continues.... Rev. 7 17 July 1998 Data Sheet AS2533...6 Flash MUTE MASK HS/DPN tM tFD tM tPFP tM tFD tM Repeat Dialling (not AS2535) Number engaged New connection RP key MUTE DIALLING HS/DPN Power Down tRP Rev. 7 18 t AP July 1998 Data Sheet AS2533...6 Electrical Characteristics Absolute Maximum Ratings Positive Supply Voltage .................................................................................................................. -0.3V ≤ VDD ≤ 7V Input Current ............................................................................................................................................... ± 25 mA Input Voltage (LS) ......................................................................................................................... -0.3V ≤ VIN ≤ 10V Input Voltage (LI, CS) ...................................................................................................................... -0.3V ≤ VIN ≤ 8V Input Voltage (STB, RI) ......................................................................................................... -2V ≤ VIN ≤ VDD + 0.3V Input Voltage (MO) ...................................................................................................................... -0.3V ≤ VIN ≤ +35V Digital Input Voltage ............................................................................................................-0.3V ≤ VIN ≤ VDD + 0.3V Electrostatic Discharge ................................................................................................................................ ± 1000V Storage Temperature ..................................................................................................................... -65°C to +125°C Recommended Operating Conditions Supply Voltage * (Speech Mode) ....................................................................................................... 4V ≤ VDD ≤ 5V Oscillator Frequency (Resonator: Murata CSA 3.58M G312AM) .............................................................. 3.58 MHz Operating Temperature ................................................................................................................... - 25°C to +70°C * This voltage is generated internally DC Characteristics (ILINE = 15 mA unless otherwise specified) Symbol Parameter Conditions IDD Operating Current IDD0 Retention Current Min Typ Max Units Speech mode 3 5 mA MF dialling 4 mA LD dialling, VDD = 2.5V 200 µA Ring mode, VDD = 2.5V 300 µA Idle mode, VDD = 2V 0.05 µA TAMB = 25°C VLI Line Voltage (default) 13 mA ≤ ILINE ≤100 mA 4.5 V IOL Output Current, Sink VOL = 0.4V 1.5 mA 4 mA CS, HS/DP, MO IOL Output Current, Sink; LED VOL = 0.4V VIL Input Low Voltage HS/DPN; FCI VSS 0.3 VDD V 0.7 VDD VDD V TAMB = 25°C VIH Input High Voltage HS/DPN; FCI TAMB = 25°C Rev. 7 19 July 1998 Data Sheet AS2533...6 AC Characteristics (ILINE = 15 mA; f = 800 Hz unless otherwise specified) Symbol Parameter Conditions Tx Transmit Test Circuit Fig. 10 ATX Gain, Transmit M1/M2 to LI ∆ATX/F Variation with Frequency f = 500 Hz to 3.4 kHz THD Distortion VLI ≤ 0.25VRMS VAGC Soft Clip Level VLI = ASCO Min Typ Max Units 35.1 36.6 38.1 dB ±0.8 dB 2 % 2 VPEAK Soft Clip Overdrive 20 dB tATTACK Attack Time 30 µs/6 dB tDECAY Decay Time 20 ms/6dB ZIN Input Impedance (M1/M2) 20 kΩ AMUTE Mute Attenuation Mute activated VNO Noise Output Voltage TAMB = 25°C VIN Max Input Voltage Range Differential (M1/M2) Single Ended 60 dB -72 dBmp ±1 VPEAK ±0.5 VPEAK BJT Output Driver VIN MAX Input Voltage Range (LI) ±2 VPEAK VTX Dynamic Range ±2 VPEAK RL Return Loss ∆ZAC/TEMP Temperature Variation Rx Receive ARX Receive Gain (Vol. default) LI to RO AVOL Volume Gain VOL key +5.4 dBr AVOL Volume Gain –/+ keys -5.4/+8.1 dBr ∆ARX/F Variation with Frequency f = 500 Hz to 3.4 kHz ±0.8 dB THD Distortion VRI ≤ 0.25VRMS VAGC Soft Clip Level VRO = ASCO Soft Clip Overdrive tATTACT Attact Time tDECAY Decay Time VNO Noise Output Voltage TAMB = 25°C -72 dBmp VUFC Unwanted F. Components 50 Hz....20 kHz -60 dBm ZIN Input Impedance (RI) 8 kΩ VIN RI Input Voltage Range (RI) ±2 VPEAK AST Sidetone Cancellation VIN ST Input Voltage Range (STB) ±2 VPEAK ZIN Input Impedance (STB) 80 kΩ Rev. 7 ZRL=1000Ω; TAMB = 25°C 18 dB Ω/°C 0.5 Test Circuit Fig. 10 1.5 3 4.5 2 VRI > 0.8VRMS VRI ≤ 0.25VRMS % 1 VPEAK 10 dB 30 µs/6 dB 20 ms/6dB 26 20 dB dB July 1998 Data Sheet AS2533...6 AC Characteristics (cont´d) (ILINE = 15 mA; f = 800 Hz unless otherwise specified) Symbol Parameter Conditions Min Typ Max Units Keyboard tD Key Debounce Time 15 ms HS/DPN Input tHS-L Low to High Debounce Going off-hook 15 ms tHS-H High to Low Debounce Not LD dialling 210 ms During LD dialling 270 ms DTMF F Frequency deviation Note 5 VMF MF Tone Level (Low group) MFL = AGND MFL = VSS 1.2 % - 2.5 -4 - 5.5 dB - 14.5 - 16 - 17.5 dB 1.8 2.4 3.0 dB ∆VL-H Preemphasis Low to High VUFC Unwanted F. Componets 300 Hz...5 kHz -40 dBm Note 3; MFL = VSS 5 kHz...14 kHz -50 dBm 14 kHz...28.5 kHz -70 dBm 28.5 kHz...40 kHz -80 dBm tTD Tone Duration Note 1&6; Mode=row 6 or 7 80 82.3 85 ms tITP Inter Tone Pause Note1; Mode=row 6 80 82.3 85 ms tITP Inter Tone Pause Note 1 & 6; Mode=row 7 150 165 170 ms tTR Tone Rise Time Note 2 5 ms tTF Tone Fall Time Note 2 5 ms LD tDR Dial Rate Mode = row 1, 2 or 5 9.53 10 10.5 pps Mode = row 3 or 4 19.05 20 21 pps t/B Break Period Mode = row 2 57 61.2 63 ms t/B Break Period Mode = row 4 28.5 30.6 31.5 ms t/B Break Period Mode = row 1 or 5 63 66 69 ms t/B Break Period Mode = row 3 31.5 33 34.5 ms tM/ Make Period Mode = row 2 38 40.8 42 ms tM/ Make Period Mode = row 4 19 20.4 21 ms tM/ Make Period Mode = row 1 or 5 31.5 33 34.5 ms tM/ Make Period Mode = row 3 15.7 16.5 17.3 ms tPDP Pre-Digit Pause tIDP Inter Digit Pause Mode = row 1, 2, 3, 4 or 5 tHS-H High to Low Debounce During LD dialling tMO Mute Overhang Rev. 7 35 800 840 270 ms 880 ms ms tM 21 July 1998 Data Sheet AS2533...6 Symbol Parameter Conditions Min tFD Flash Duration 1 R1 key Flash Duration 2 Flash Duration 3 tPFP Post Flash Pause tAP Access Pause tRP Repeat Break Time Typ Max Units 100 102 ms R2 key 270 300 ms R3 key (AS2533/4B/5/6) 600 650 ms R3 key (AS2534E only) 312 450 ms 375 274 Note 8 2.0 2.05 ms 2.12 1.6 sec sec Tone Ringer VMO Melody Output PDM tMD Melody Delay F1 Frequency 1 800 Hz F2 Frequency 2 1067 Hz F3 Frequency 3 1333 Hz tDT Detection Time 1/f + 73ms s tTO Detection Time-out note 4 ms fMIN Min. Detection Frequency 13 Hz fMAX Max. Detection Frequency 70 Hz 1477 Hz 10 Initial ms Pacifier Tone Programme Mode Only fPT Frequency P/M mode, key entry VRT Level (RO) Key entry 60 mV tRTD-E Duration, Key Entry Valid key entry, prog. 40 ms tRTD-A Duration, Acknowledge Terminate with P/M key 140 ms tRTD-R Duration, Reject Invalid key entry, note 7 4x40 ms LED Output tLED-ON "on-time" P/M state 80 ms tLED-OFF Interval P/M state 1 sec -30 dBr Comfort Tone (DTMF) VCT Level (RO) Relative to LS Note 1: The values are valid during automatic dialling and are minimum values during manual dialling, i.e. the tones will continue as long as the key is depressed. Note 2: The rise time is the time from 10% of final value till the tone amplitude has reached 90 % of its final value. Note 3: Relative to high group. Note 4: The FCI circuit is reset by POR and HS/DPN pulled high (off-hook). After a reset the FCI circuit is in a standby state. A positive edge on FCI will start a 73 ms timer and the frequency discrimination is initiated. Whenever a period of the ring signal is missing, the timer is reset. When a valid ring signal is present for 73 ms, the melody generator is started and is directly controlled by the ring signal. This condition will remain until a new reset. Note 5: This does not include the frequency deviation of the ceramic resonator. Note 6: During temporary MF mode. Note 7: An invalid key entry in programme mode will invoke a tone sequence with 4 tone bursts of 40 ms and pauses between bursts of 28 ms and abort the programme mode. Note 8: Pauses inserted within the first 5 entries of a digit string will be automatically terminated after 2 seconds. Pauses inserted after location 5 can only be terminated manually by pressing the PS or LNR key. Rev. 7 22 July 1998 Rev. 7 ILINE B 10V BC 327 10 n 30 Ω 300 Ω 10 µ 6k 3.58 MHz 1µ 23 9 7 11 10 2 26 25 27 6 28 1 LLC CI OSC HS/DP MFL Vss CS LI STB RI LS FCI AS253x UL 600 Ω 100 µ A 21 VDD MO MODE R4 R3 R2 R1 C4 C3 C2 C1 AGND LED RO M2 M1 4 8 12 17 18 19 20 13 14 15 16 5 22 3 24 23 5V6 22 µ 100 µ 150 Ω 100 µ Data Sheet AS2533...6 Test Circuit MULTI-STANDARD SINGLE CHIP TELEPHONE Figure 10 July 1998 Data Sheet AS2533...6 Characteristic Curves (Typical) Fig. 11 Receive Soft Clipping and Distortion 12 1,2 soft clipping (Vp) 2,5 11 (%) VRO 1,0 10 (%) 9 soft clipping (Vp) 10 VLS 2,0 8 0,6 8 7 6 5 0,4 4 THD 3 2 0,2 7 Line Current: 20 mA Frequency Tamb: 25°C Typically 1,5 6 5 1,0 Distortion Line Current: 20 mA Frequency: 800 Hz Tamb: 25°C Typically 0,8 Line Output Voltage (LS) 9 Distortion Receive Output Voltage (RO) Fig. 12 Transmit Soft Clipping and Distortion 4 THD 0,5 3 2 1 0,0 0,00 1 0 0,25 0,50 0,75 1,00 1,25 1,50 Line Input Voltage (LS) 1,75 2,00 (Vp) 0,0 0 25 50 75 100 0 125 (mVp) 150 Microphone Input Voltage (M1/M2) Fig. 13 DC Mask (V) 8 VLS 7 6 VLI 5 4 Typically No ac signals Tamb: 25°C 3 2 1 0 0 Rev. 7 10 20 30 40 Line 50 Current 60 24 70 80 90 (mA) 100 July 1998 Data Sheet AS2533...6 28 Pin DIP (suffix P) 28 Pin SOIC (suffix T) 1 2 28 27 3 4 5 26 25 24 STB CI 6 7 8 MO LLC HS/DP OSC MODE C4 C3 9 10 11 12 AS253x LS MFL RO VDD AGND 13 14 LS MFL RO VDD AGND STB CI MO LLC HS/DP OSC MODE C4 C3 RI LI VSS CS M2 23 22 21 M1 LED FCI 20 19 18 17 R1 R2 16 15 C1 C2 R3 R4 1 28 2 27 3 26 4 25 5 24 6 7 8 9 10 AS253x Pin Configuration 23 22 21 20 19 11 18 12 17 13 16 14 15 RI LI VSS CS M2 M1 LED FCI R1 R2 R3 R4 C1 C2 Ordering Information Device AS2533 T AS2533 P AS2534B T AS2534B P AS2534E P AS2534E T AS2535 T AS2535 P AS2536 T AS2536 P Package 28 pin SOIC 28 pin DIP 28 pin SOIC 28 pin DIP 28 pin DIP 28 pin SOIC 28 pin SOIC 28 pin DIP 28 pin SOIC 28 pin DIP Memories 4 direct/10 indirect 4 direct/10 indirect none none none none 12 direct 12 direct 4 direct/10 indirect 4 direct/10 indirect Volume yes, note 1 yes, note 1 yes, note 2 yes, note 2 yes, note 2 yes, note 2 yes, note 1 yes, note 1 yes, note 2 yes, note 2 Centrex ABCD ABCD ABCD ABCD ABCD ABCD no no ABCD ABCD Special keys P/M, LNR, R1-3, MR, RP, PS, T/P P/M, LNR, R1-3, MR, RP, PS, T/P P/M, LNR, R1-3, RP, PS, T/P P/M, LNR, R1-3, RP, PS, T/P MT, LNR, R1-3, RP, PS, T/P MT, LNR, R1-3, RP, PS, T/P P/M, LNR, R1-3 P/M, LNR, R1-3 P/M, LNR, R1-3, MR, RP, PS, T/P P/M, LNR, R1-3, MR, RP, PS, T/P Conditions for delivery as dice see also data sheet AS2533/4B/5/6-CX. Note 1: volume is reset to default by on-/off-hook and by POR Note 2: volume is reset by POR only. Application: For application support contact your local sales offices. Devices sold by Austria Mikro Systeme/Thesys are covered by the warranty and patent idemnification provisions appearing in its Term of Sale. Austria Mikro Systeme/Thesys makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the decribed devices from patent infringement. Austria Mikro Systeme reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with Austria Mikro Systeme for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equiment are specifically not recommended without additional processing by Austria Mikro Systeme/Thesys for each application. Copyright © 1995-8, Austria Mikro Systeme International AG, Schloss Premstätten, 8141 Unterpremstätten, Austria. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. The information furnished here by Austria Mikro Systeme/Thesys is believed to be correct and accurate. However, Austria Mikro Systeme/Thesys shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of Austria Mikro Systeme/Thesys‘ rendering of technical or other services. Rev. 7 25 July 1998