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Data Sheet
AS2533...6
(R)
Austria Mikro Systeme International AG
Multi-Standard CMOS Single Chip Telephone IC with Dual Soft Clipping
General Description
The AS253x is a CMOS integrated circuit that contains all the functions needed to form a high performance electronic telephone. 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.
Key Features
u Line/speech circuit, LD/MF repertory dialler and tone ringer on one 28 pin CMOS chip u Operating range from 13 to 100 mA (down to 5 mA with reduced performance) u Soft clipping to avoid harsh distortion u Volume control of receive signal u Line loss compensation selectable by pin option u Low noise (max. - 72 dBmp) u Real or complex impedance u NET 4 compatible u LD/MF switchable dialling u Pacifier tone during programming u 31 digit last number redial u Repertory memories (not AS2534), 4 direct/10 indirect (AS2533/6), 12 direct (AS2535) u Repeat dialling by busy or engaged (not AS2535) u Sliding cursor protocol with comparison u Pause key for access pause or wait function u 3 flash keys, 100 ms, 280 ms and 375/600 ms u On chip MF filter (CEPT CS 203 compatible) u Ring frequency discrimination u 3-tone melody generator
Package
Available in 28 pin SOIC or DIP.
Block Diagramme
La
Z2 Z1
ZBAL
Lb
LI CS
CI
LS
RI
STB
AGND
LED
RO LINE ADAPTATION POWER EXTRACTION DC MASK LINE CURRENT SENSE SOFT CLIP AGC M2 M1
VDD VDD Vss
AS253x
MELODY SEQUENCER TONE GENERATOR
MUTE
MO
R4 R3
RAM DIALLER
R2 R1
FCI
RING FREQUENCY DISCRIMINATION
CONTROL LOGIC
OSC
HS/DP
LLC
OSC 3.58 MHz
MFL
MODE
C1
C2
C3
C4
LLC Hi LLC Lo LLC Off AGND
KEY PAD
Rev. 7
1
July 1998
Data Sheet
Pin Description
Pin # 23 24 3 Symbol M1 M2 RO Function Microphone Inputs Differential inputs for the microphone (electret).
AS2533...6
Receive Output This is the output for driving a dynamic earpiece with an impedance of 140 to 300 . Analogue Ground This is the analogue ground for the amplifiers. Receive Input This is the input for the receive signal. Side Tone Balance Input This is the input for side tone cancellation. Line Current Sense Input This is the input for sensing the line current. Line Input This input is used for power extraction and line current sensing. 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. Positive Voltage Supply This is the supply pin for the circuit. Negative Power Supply Melody Output PDM output of the melody generator for tone ringing. Hi-Z when not active. Frequency Comparator Input This is a Schmitt trigger input for ring frequency discrimination. Disabled during off-hook. 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. Oscillator Input Pin for ceramic resonator (3.58 MHz). Recommended: Murata CSA 3.58MG312AM. 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. LED Output Driver Output for driving an LED that will be flashing when in Programme/Mute state.
5
AGND RI
28
6
STB
1
LS
27
LI
25
CS
4
VDD VSS MO
26 8
21
FCI
10
HS/DP
11
OSC
9
LLC
22
LED
Continues... Rev. 7 2 July 1998
Data Sheet
Pin Description contd Pin # 12 Symbol MODE Function Signalling Mode Select Input Mode pin Open Row 1 Row 2 Row 3 Row 4 Row 5 Row 6 Row 7 Function Dialling inhibited LD mode, 10 pps, 33/66 ms LD mode, 10 pps, 40/60 ms LD mode, 20 pps, 33/66 ms LD mode, 20 pps, 40/60 ms
AS2533...6
LD mode, 10 pps, 33/66 ms, Temp. MF with tone on first * key entry MF only, 82/82 ms MF only, 82/160 ms
During temporary MF: 82/160 ms 20 19 18 17 16 15 14 13 R1 R2 R3 R4 C1 C2 C3 C4 Keyboard Rows (see key arrangement in figure 2)
Keyboard Columns (see key arrangement in figure 2)
7
CI
Complex Impedance Pin For complex impedance a capacitor should be connected to this pin. MF Level Setting A voltage divider connected from this pin to AGND and VSS can be used to set the DTMF level.
2
MFL
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
Keyboard Connections
Key closure, RON max. = 1 kohm Key open, ROFF min. = 1 Mohm (Either VOL or +/- keys)
AS2533...6
C1 R1 R2 R3 R4
C2
C3
C4
P/M 4 8 # LNR A RP M2
1 5 9 R1 VOL B PS M3
2 6 0 R2
3 7
*
R3
+
C T/P M4
Figure 2a (AS2533/6)
-
D M1 MR
For AS2534E P/M is MT key.
C1 R1 R2 R3 R4
C2
C3
C4
P/M 4 8 # LNR A RP
1 5 9 R1 VOL B PS
2 6 0 R2
3 7
*
R3
+
C T/P
Figure 2b (AS2534)
-
D
Rev. 7
4
July 1998
Data Sheet
Keyboard Connections Continued (Either VOL or +/- keys)
AS2533...6
C1 R1 R2 R3 R4
C2
C3
C4
P/M 4 8 # LNR M1 M5 M9
1 5 9 R1 VOL M2 M6 M10
2 6 0 R2
3 7
*
R3
+
M3 M7 M11
-
M4 M8 M12
Figure 2c (AS2535)
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.
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.
AC Impedance 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. At line currents below 13 mA the AS253x provides an additional slope below 4.5V in order to allow parallel operation (see figure 13). 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: 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:
ZAC = 33 * Z 1
The dc value of Z1 should be 30 to maintain correct dc performance. Return loss and side tone cancellation can be determined independant of each other.
Speech Circuit
The speech circuit consists of a transmit and a receive path with dual soft clipping, mute, line loss compensation and sidetone cancellation. Transmit The gain of the transmit path is 37 dB for 600 line termination from M1/M2 to LS (see test circuit figure 10).
VLS = VLI + ILINE R1
The voltage at LI is 4.5V in the normal operating range. During pulse dialling the speech circuit and other part of
Rev. 7
5
July 1998
Data Sheet
The microphone input is differential with an input impedance of 20 k. The soft clip circuit limits the output voltage at LI to 2VPEAK (see figure 12). The attack time is 30 s/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. Receive The gain of the receive path is 3 dB for 600 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. 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. The soft clip circuit limits the voltage at the receive output (RO) to 1VPEAK (see figure 11). It prevents harsh distortion and acoustic shock. Sidetone A good sidetone cancellation is achieved by using the following equation:
AS2533...6
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 ). The line loss compensation is disabled when LLC = low (see figure 4 and 5).
Dialling Functions
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 k). 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 controller to the rows and columns (see application note AN3010). 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. When programme/mute is activated, the LED indication is turned on (flashing: 80 ms 'on' and 1 sec 'off'). 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. When MF mode is selected by the mode pin, the circuit can not be changed temporary to LD but will remain in MF mode. 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.
ZBAL Z 2 = ZLINE Z 1
The sidetone cancellation signal is applied to the STB input.
ZLINE
Z1
ZBAL
Figure 3 Side Tone Balance
Z2
Rev. 7
6
July 1998
Data Sheet
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. 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. 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. 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. 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. 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 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. If pressing the recall key is not followed by digit entries, the LNR RAM remains intact. After a recall a 270 ms pause will automatically be executed.
AS2533...6
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 AS2533/6 AS2534 AS2535 14 0 12 4 0 12 10 0 0
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. Example (45678-123 is stored in M1, where - is a pause/wait and 123 the extention number): 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). 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. If there is an error in matching, the LNR will be inhibited until next on-hook, and the RAM will contain the new number. 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).
Tone Generator
The tone generator incorporates the DTMF tones, 3 basic frequencies for the tone ringer and pacifier tones.
Rev. 7
7
July 1998
Data Sheet
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 High group Digit 1-4-7- * Digit 2-5-8-0 Digit 3-6-9-# Digit A-B-C-D
AS2533...6
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: Sequence F1 F2 F3 F1 F2 F3 ...
697 Hz 770 Hz 852 Hz 941 Hz
1209 Hz 1336 Hz 1477 Hz 1633 Hz (not AS2535)
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) 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: 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 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 Volume - 16 dB - 7 dB 0 dB (max.) - 16 dB - 7 dB 0 dB (max.) - 16 dB - 7 dB 0 dB (max.) Off
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. 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. 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).
Rev. 7
8
July 1998
Data Sheet
Typical Characteristics of Line Loss Compensation
Fig. 4
AS2533...6
(dB) 35 34 33 32 31 30 29
Tx Gain LLC = AGND f = 800 Hz ZLINE = 600 VLS = -10 dBm 20 30 40 50 60 70 80 LLC = VDD LLC = VSS
DC Line Current (mA)
Fig. 5
(dB) +4 +3 +2 +1 0 -1 -2
Rx Gain LLC = AGND f = 800 Hz ZLINE = 600 VLS = -10 dBm VOL = 0 dB (neutral) 20 30 40 50 60 70 80 LLC = VDD LLC = VSS
DC Line Current (mA)
Rev. 7
9
July 1998
Figure 8
AC Model of Speech Circuit
Data Sheet
ZBAL (10 x ZLINE) 80 k STB 300 LI 8k RI
+
-
Rev. 7
LLC & VOLUME SC COMFORT TONES 0 dB - 26dB + - 10dB + RO Z LINE DTMF 30 ZREF LLC & SC
10 July 1998
+
20 k - 12dB + - 23dB + 20 k M1
ZSYN (970)
CS
PRIVACY MUTE CI
M2
32.3 x ZREF
AS2533...6
Data Sheet
Typical Application
Complex Impedance (270 + 750 // 150 nF) Figure 9
Only the components necessary for presenting the complete functions of the AS253X are included. The external components might change to comply with various national PTT regulations and to interface to different transducers. 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. For further application information please refer to application note AN2201.
CS R1 30 2k2 100 F
AS2533...6
1k8
300
10 F
RO
10 n
10 n
1k8
M2
M1
R4
R3
R2
R1
LED
C3
C4
KEY PAD
3.58 MHz LLC Hi LLC Lo LLC off 10 F 330 k 18V 5V1 470 F
DIALLER
AGND
10 n
7k5
100
AS253x
MUTE
1k8
1
STB
RAM
MODE
C1
300
R5
TONE GENERATOR
MFL
10
OSC
RI
SOFT CLIP AGC
LINE CURRENT SENSE
LS
CONTROL LOGIC
LLC
OSC
15 n
LINE ADAPTATION POWER EXTRACTION DC MASK
VDD
MO
Vss
FCI
RING FREQUENCY DISCRIMINATION
CI
MELODY SEQUENCER
LI
VDD
10V
BC327
2N5551
2SA1209
220 k
47 k
220 k
1M
100 k
2k2
5M1
0.68 F
Rev. 7
11
BC547
4148
470 k
10 k
220 k
10 n
HS/DP
AGND
July 1998
56 k
100 k
(see fig. 2)
C2
Data Sheet
Operating Procedures
AS2533...6
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 users expectations - be easy to learn and relearn - not invoke any automatic functions which the user doesnt 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
Idle (on-hook, no ringing)
ENTRIES
PROCESSING
Going off-hook
X
sec
Time out (x sec.)
Going on-hook
Speech mode
or
Dialling (LD or MF)
KEY
Privacy mute
Pressing a key
Storing (writing into RAM)
Programming
Entering a number
TEXT
Processing according to text
False programme entry
TEXT
Entry according to text
reading from memory
Invalid entry
TEXT
State according to text
Rev. 7
12
July 1998
Data Sheet
Programming Tone Ringer (not AS2534E)
AS2533...6
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
Temporary MF MODE pin connected to row 1, 2, 3, 4 or 5
AS2533...6
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
T/P
R
R
T/P
EXIT FIFO
FIFO
*
Rev. 7
14
July 1998
Data Sheet
Storing Numbers (not AS2534)
AS2533...6
P/M
Key entries different to the procedure will be ignored. Exit programme mode from each state with on-hook or with the P/M key.
Programme State Speech circuit muted LED flashing
#
Programming Tone Ringer Melodies
M1-12
MR
Any invalid key entry will abort programme state
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
Automatic Dialling
AS2533...6
MR
M1-12
LNR
0-9
or
Postdialled digits are not stored but buffered in FIFO
Rev. 7
16
July 1998
Data Sheet
Timing Diagrammes
LD Dialling
AS2533...6
MUTE MASK HS/DPN
tIDP tPDP
tB tM
tB tM
tIDP t PDP
tB tM
LD Dialling With Access Pause
MUTE MASK HS/DPN
t IDP t PDP
tB tM
tB tM
t AP
tIDP t PDP
tB tM
MF Dialling
MUTE MASK HS/DPN
TONE tTD
Continues....
tITP
tTD
tITP
tAP
t TD
tITP
Rev. 7
17
July 1998
Data Sheet
Flash
AS2533...6
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 t AP
Rev. 7
18
July 1998
Data Sheet
Electrical Characteristics
Absolute Maximum Ratings
AS2533...6
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 ..................................................................................................................... -65C to +125C
Recommended Operating Conditions Supply Voltage * (Speech Mode) ....................................................................................................... 4V VDD 5V Oscillator Frequency (Resonator: Murata CSA 3.58M G312AM) .............................................................. 3.58 MHz Operating Temperature ................................................................................................................... - 25C to +70C * This voltage is generated internally
DC Characteristics (ILINE = 15 mA unless otherwise specified) Symbol IDD Parameter Operating Current Conditions Speech mode MF dialling LD dialling, VDD = 2.5V Ring mode, VDD = 2.5V IDD0 VLI IOL IOL VIL VIH Retention Current Idle mode, VDD = 2V TAMB = 25C Line Voltage (default) Output Current, Sink CS, HS/DP, MO Output Current, Sink; LED Input Low Voltage VOL = 0.4V HS/DPN; FCI TAMB = 25C Input High Voltage HS/DPN; FCI TAMB = 25C 0.7 VDD VDD V VSS 4 0.3 VDD mA V 13 mA ILINE 100 mA VOL = 0.4V 4.5 1.5 V mA Min Typ 3 4 200 300 0.05 Max 5 Units mA mA A A A
Rev. 7
19
July 1998
Data Sheet
AC Characteristics (ILINE = 15 mA; f = 800 Hz unless otherwise specified) Symbol Tx ATX ATX/F THD VAGC ASCO tATTACK tDECAY ZIN AMUTE VNO VIN Max BJT VIN MAX VTX RL ZAC/TEMP Rx ARX AVOL AVOL ARX/F THD VAGC ASCO tATTACT tDECAY VNO VUFC ZIN VIN RI AST VIN ST ZIN Parameter Transmit Gain, Transmit Variation with Frequency Distortion Soft Clip Level Soft Clip Overdrive Attack Time Decay Time Input Impedance (M1/M2) Mute Attenuation Noise Output Voltage Input Voltage Range (M1/M2) Output Driver Input Voltage Range (LI) Dynamic Range Return Loss Temperature Variation Receive Test Circuit Fig. 10 1.5 3 +5.4 -5.4/+8.1 0.8 ZRL=1000; TAMB = 25C 18 0.5 2 2 Mute activated TAMB = 25C Differential Single Ended 1 0.5 60 Conditions Test Circuit Fig. 10 M1/M2 to LI f = 500 Hz to 3.4 kHz VLI 0.25VRMS VLI = 2 20 30 20 20 35.1 36.6 0.8 Min Typ
AS2533...6
Max
Units
38.1
dB dB
2
% VPEAK dB s/6 dB ms/6dB k dB
-72
dBmp VPEAK VPEAK VPEAK VPEAK dB /C
Receive Gain (Vol. default) LI to RO Volume Gain Volume Gain Variation with Frequency Distortion Soft Clip Level Soft Clip Overdrive Attact Time Decay Time Noise Output Voltage Unwanted F. Components Input Impedance (RI) Input Voltage Range (RI) Sidetone Cancellation Input Voltage Range (STB) Input Impedance (STB) VRI 0.25VRMS TAMB = 25C 50 Hz....20 kHz VRI > 0.8VRMS VOL key -/+ keys f = 500 Hz to 3.4 kHz VRI 0.25VRMS VRO =
4.5
dB dBr dBr dB
2 1 10 30 20 -72 -60 8 2 26 2 80
% VPEAK dB s/6 dB ms/6dB dBmp dBm k VPEAK dB VPEAK k
Rev. 7
20
July 1998
Data Sheet
AC Characteristics (contd) (ILINE = 15 mA; f = 800 Hz unless otherwise specified) Symbol Parameter Keyboard tD tHS-L tHS-H Key Debounce Time HS/DPN Input Low to High Debounce High to Low Debounce Going off-hook Not LD dialling During LD dialling DTMF F VMF VL-H VUFC Frequency deviation Note 5 - 2.5 - 14.5 1.8 300 Hz...5 kHz 5 kHz...14 kHz 14 kHz...28.5 kHz 28.5 kHz...40 kHz tTD tITP tITP tTR tTF tDR t/B t/B t/B t/B tM/ tM/ tM/ tM/ tPDP tIDP tHS-H tMO Tone Duration Inter Tone Pause Inter Tone Pause Tone Rise Time Tone Fall Time LD Dial Rate Mode = row 1, 2 or 5 Mode = row 3 or 4 Break Period Break Period Break Period Break Period Make Period Make Period Make Period Make Period Pre-Digit Pause Inter Digit Pause High to Low Debounce Mute Overhang Mode = row 1, 2, 3, 4 or 5 During LD dialling 800 Mode = row 2 Mode = row 4 Mode = row 1 or 5 Mode = row 3 Mode = row 2 Mode = row 4 Mode = row 1 or 5 Mode = row 3 9.53 19.05 57 28.5 63 31.5 38 19 31.5 15.7 10 20 61.2 30.6 66 33 40.8 20.4 33 16.5 35 840 270 tM Note 1&6; Mode=row 6 or 7 Note1; Mode=row 6 Note 1 & 6; Mode=row 7 Note 2 Note 2 80 80 150 82.3 82.3 165 -4 - 16 2.4 15 210 270 15 Conditions Min Typ
AS2533...6
Max
Units
ms
ms ms ms
1.2 - 5.5 - 17.5 3.0 -40 -50 -70 -80 85 85 170 5 5
% dB dB dB dBm dBm dBm dBm ms ms ms ms ms
MF Tone Level (Low group) MFL = AGND MFL = VSS Preemphasis Low to High Unwanted F. Componets Note 3; MFL = VSS
10.5 21 63 31.5 69 34.5 42 21 34.5 17.3
pps pps ms ms ms ms ms ms ms ms ms
880
ms ms
Rev. 7
21
July 1998
Data Sheet
Symbol tFD Parameter Flash Duration 1 Flash Duration 2 Flash Duration 3 Conditions R1 key R2 key R3 key (AS2533/4B/5/6) R3 key (AS2534E only) tPFP tAP tRP VMO tMD F1 F2 F3 tDT tTO fMIN fMAX fPT VRT tRTD-E tRTD-A tRTD-R tLED-ON tLED-OFF VCT Post Flash Pause Access Pause Repeat Break Time Tone Ringer Melody Output Melody Delay Frequency 1 Frequency 2 Frequency 3 Detection Time Detection Time-out Min. Detection Frequency Max. Detection Frequency Pacifier Tone Frequency Level (RO) Duration, Key Entry Duration, Acknowledge Duration, Reject LED Output "on-time" Interval Comfort Tone (DTMF) Level (RO) Relative to LS -30 P/M state P/M state 80 1 Programme Mode Only P/M mode, key entry Key entry Valid key entry, prog. Terminate with P/M key Invalid key entry, note 7 1477 60 40 140 4x40 Initial 800 1067 1333 1/f + 73ms note 4 13 70 PDM Note 8 2.0 Min 100 270 600 312 375 274 2.05 1.6 Typ
AS2533...6
Max 102 300 650 450 Units ms ms ms ms ms 2.12 sec sec
10
ms Hz Hz Hz s ms Hz Hz
Hz mV ms ms ms
ms sec
dBr
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
Data Sheet
Test Circuit
Rev. 7
21 FCI M1 23 1 LS M2 10 30 RI STB RO 100 LED AGND 100 16 C1 C2 C3 C4 R1 R2 R3 R4 18 17 20 19 13 14 15 5 22 3 150 6 300 6k 1 28 24
AS253x
A
100
ILINE
600
10 n
10V
UL
B 27 LI
MULTI-STANDARD SINGLE CHIP TELEPHONE
Figure 10
25 CS Vss MFL 26 2
23
10 HS/DP OSC 11 3.58 MHz 7 CI 12 MODE MO 9 LLC VDD 8 4
BC 327
22
AS2533...6
July 1998
5V6
Data Sheet
Characteristic Curves (Typical)
Fig. 11 Receive Soft Clipping and Distortion
1,2 (Vp) 1,0
Receive Output Voltage (RO)
12
AS2533...6
Fig. 12 Transmit Soft Clipping and Distortion
2,5 (Vp) 2,0 soft clipping VLS
soft clipping VRO
11 (%) 10 9
10 (%) 9 8 7
Distortion
0,8
7 6 5
Distortion
0,6
Line Current: 20 mA Frequency: 800 Hz Tamb: 25C Typically
8
Line Output Voltage (LS)
1,5
Line Current: 20 mA Frequency Tamb: 25C Typically
6 5 4 THD 3 2 1
0,4
THD
4 3
1,0
0,2
2 1
0,5
0,0 0,00
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 Microphone Input Voltage (M1/M2)
0 125 (mVp) 150
Fig. 13 DC Mask
(V) 8 7 6 5 4 3 2 1 0 0 10 20 30 40 Line 50 Current 60 70 80 90 (mA) 100 Typically No ac signals Tamb: 25C VLI VLS
Rev. 7
24
July 1998
Data Sheet
Pin Configuration
28 Pin SOIC (suffix T) 28 Pin DIP (suffix P)
AS2533...6
STB CI MO LLC HS/DP OSC MODE C4 C3
AS253x
6 7 8 9 10 11 12 13 14
AS253x
LS MFL RO VDD AGND
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28 27 26 25 24 23 22 21 20 19 18 17 16 15
RI LI VSS CS M2 M1 LED FCI R1 R2 R3 R4 C1 C2
LS MFL RO VDD AGND STB CI MO LLC HS/DP OSC MODE C4 C3
1 2 3 4 5
28 27 26 25 24 23 22 21 20 19 18 17 16 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 (c) 1995-8, Austria Mikro Systeme International AG, Schloss Premstatten, 8141 Unterpremstatten, Austria. Trademarks Registered (R). 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

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