AG1170P-D3

V1.9 September 2006 Data Sheet Silver TELECOM Pb Pb Ag1170 +5V / +3.3V Low Power Ringing SLIC FEATURES • A highly featured low power SLIC in a 14 pin SIL or 21 pin DIL format. • Integral high efficiency DC/DC converter. Single +5V or +3.3V supply voltage. • Highly integrated with an on-board ringing generator. • Tip/Ring polarity reversal. On-Hook Transmission for caller line ID. • Line and balance impedance programmable with external components (on Ag1170-P version) • Easy to use, with a minimum number of external components. • Simplified protection in “on-premise” applications. DESCRIPTION The Silver Telecom Ag1170 is a single Subscriber Line Interface Circuit (SLIC) in a 14 pin single in line (SIL) or 21 pin dual in line (DIL) format. The combination of features and packaging offers extremely efficient use of board area, saving significant system size and cost, minimising time to market for Telephony Systems developers. The Ag1170 has been designed to work with loop lengths of typically 3.0km (800Ω including telephone). Its performance to regulatory standards (G712) allows use in public and private network applications. • Silver Telecom “design-in” assistance. The Ag1170 has integral dc/dc converter and ringing generation thus providing all the line powering requirements from a single supply. The SLIC requires a minimum of external components. The system interface has been designed for direct connection to popular codecs, for both audio and signalling The Ag1170 is ideal for low line count, short loop length applications, such as ISDN Terminal Adaptors, Internet Telephony (VoIP), Computer Telephony Integration (CTI), Wireless Local Loops (WLL) and Small Office Home Office (SOHO). © Silver Telecom 2006 V1.9 September 2006 Data Sheet Ag1170 +5V / +3.3V LOW POWER RINGING SLIC Ag1170-D 5 /3.3 Low Po wer Ringin g S LIC Silver TELECOM Figure 1: DIL Variant Packaging Format Ag1170S Silver TELECOM Figure 2: SIL Variant Packaging Format Part Number Ag1170-D5 Ag1170-S5 Ag1170-D3 Ag1170-S3 Ag1170P-D5 Ag1170P-S5 Ag1170P-D3 Ag1170P-S3 Impedance 600 ohm 600 ohm 600 ohm 600 ohm Programmable Programmable Programmable Programmable Package DIL SIL DIL SIL DIL SIL DIL SIL Supply Voltage 5 Volt 5 Volt 3.3 Volt 3.3 Volt 5 Volt 5 Volt 3.3 Volt 3.3 Volt Marking 5 5 3 3 P5 P5 P3 P3 Table 1: Ordering Information and Device Marking* * All versions of the Ag1170 are RoHS compliant. * Industrial temperature range versions of the Ag1170 are available. Contact Silver Telecom for further details. © Silver Telecom 2006 2 V1.9 September 2006 Data Sheet Ag1170 +5V / +3.3V LOW POWER RINGING SLIC Figure 3: Functional Block Diagram Line Reversal and Ringing Control RM F/R Tip Ring 2-4 Wire Converter and Line Interface Supervision SHK VOUT VIN Power Management and DC-DC converter GNDA VA *ZB *ZT1 *ZT2 VPWR GNDPWR PD *Only used for the Ag1170P device. Do not connect for the Ag1170 as the impedances are programmed to 600R internally. © Silver Telecom 2006 3 V1.9 September 2006 Data Sheet Ag1170 +5V / +3.3V LOW POWER RINGING SLIC 1.0 Pin Description - DIL Package Name TIP (A) RING (B) IC Description Tip. Connects to the subscriber line Tip. Ring. Connects to the subscriber line Ring. Internal Connection. Do not connect externally to this pin. Power Down of DC/DC Converter. A logic 0 powers off the DC/DC converter. Leave open circuit for free run operation. DO NOT input logic 1 to this pin. No Connection. This pin is not connected internally. No Connection. This pin is not connected internally. Ringing Mode. Sets bias conditions during ringing. Must be set to logic 1 during ringing. Logic 0 for other modes. Analog Ground. Normally connected to system ground. Analog Supply. Connect to the +5V or +3.3V supply via an RC filter, to supply power to the analog circuits. Line Impedance. Connect to ZT1 via impedance programming components. Line Impedance. Connect to ZT2 via impedance programming components. Balance Impedance. Connect to VIN via impedance programming components. Audio In. Analog input signal from the Codec (which is output on Tip and Ring). Connect via a 100nF capacitor. No Connection. This pin is not connected internally. Audio Out. Analog output signal (from Tip and Ring) to the Codec. Connect via a 100nF capacitor. Forward/Reverse. A logic 0 will reverse the Tip and Ring voltage polarities. F/R is toggled to produce the ringing output. Switch Hook. Indicates an off-hook condition when at logic 1. DC/DC Ground. Ground input for the DC/DC converter. DC/DC Supply. +5V or +3.3V input for the DC/DC converter. DC/DC Ground. Ground input for the DC/DC converter. DC/DC Supply. +5V or +3.3V input for the DC/DC converter. 1 2 3 Pin # 4 PD 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 NC NC RM GNDA +VA *ZT2 *ZT1 *ZB VIN NC VOUT F/R SHK GNDPWR +VPWR GNDPWR +VPWR * Only used for the Ag1170P device. Do not connect for Ag1170 as impedance is programmed to 600R internally © Silver Telecom 2006 4 V1.9 September 2006 Data Sheet Ag1170 +5V / +3.3V LOW POWER RINGING SLIC 1.1 Pin Description – SIL Package Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 Name RING (B) TIP (A) F/R RM SHK *ZT1 *ZT2 *ZB VIN VOUT +VA GNDPWR +VPWR Description Ring. Connects to the subscriber line Ring. Tip. Connects to the subscriber line Tip. Forward/Reverse. A logic 0 will reverse the Tip and Ring voltage polarities. F/R is toggled to produce the ringing output. Ringing Mode. Sets bias conditions during ringing. Must be set to logic 1 during ringing. Logic 0 for other modes. Switch Hook. Indicates an off-hook condition when at logic 1. Line. Connect to ZT2 via impedance programming components. Line Impedance. Connect to ZT1 via impedance programming components Balance Impedance. Connect to VIN via impedance programming components Audio In. Analog input signal from the Codec (which is output on Tip and Ring). Connect via a 100nF capacitor Audio Out. This is the analog output signal (from Tip and Ring) to the Codec. Connect via a 100nF capacitor. Analog Supply. Connected to the +5V or +3.3V supply via an RC filter, to supply power to the analog circuits. DC/DC Ground. Ground input for the DC/DC converter. DC/DC Supply. +5V or +3.3V input for the DC/DC converter. Power Down of DC/DC Converter. A logic 0 powers off the DC/DC converter. Leave open circuit for free run operation. DO NOT input logic 1 to this pin. 14 PD * Only used for the Ag1170P device. Do not connect for Ag1170 as the impedances are programmed to 600R internally © Silver Telecom 2006 5 V1.9 September 2006 Data Sheet Ag1170 +5V / +3.3V LOW POWER RINGING SLIC also guaranteed not give a false ring trip with a load of 3 REN. 2.0 Line Interfacing As well as being used in an electrically demanding environment, the needs of different applications and regulatory standards means that the SLIC must be flexible, and have facilities to ensure robust performance. The Ag1170 SLIC provides a complete and flexible interface to the telephone line. 2.3 Power Down and Synchronisation The DC/DC converter can be switched off by applying a logic 0 to the PD input. The SLIC takes 50ms to power up from this powered down state. Logic outputs are not valid during this time. When using the power down function, it is recommended that the SLIC is polled (powered up periodically) to check for SHK (the subscriber has gone off-hook). If not in Power Down mode, the PD pin should be left open circuit. An opencollector gate should be used for applying the PD signal. Never connect a logic high to the PD pin. NOTE: This is a sensitive node; keep connections very short. The DC/DC has an internal oscillator. If desired, the oscillator frequency may be synchronised with an external clock for EMI reasons. To do this, a 128kHz (+5V) or 64kHz (+3.3V) square wave (with 50:50 mark space) should be inputted to the PD pin. See Applications Note: AN1170-12, for further details. 2.1 Battery Feed The Ag1170 has an integral DC/DC converter, which generates the battery voltage in the device. This means that only a supply of +5V or 3.3V is needed, unlike conventional SLICs which will also need a battery voltage of anything between -20V and -60V (-75V for ringing). This confers a significant cost, space and time to market benefit on the equipment designer. The battery feed to the telephone line is generated from the positive supply rail. This provides a -48V battery feed to the line driver, which is adjusted automatically to match line conditions. Power efficiency is good, because the line is supplied with only as much power as is needed. Little excess heat is generated, even on short lines. The loop current is pre-set to a constant 24mA, under the conditions shown in Section 9.3 of this datasheet, which specifies the ‘DC Electrical Characteristics’ for the Ag1170. 3.0 The 2-4 Wire (hybrid) Conversion. The Ag1170 SLIC transmits and receives balanced 2-wire analog signals at the Tip and Ring connections. These are converted to a ground referenced output at VOUT and from a ground referenced input at VIN. The VOUT and VIN pins are normally connected to a Codec for conversion of audio to and from a digital Pulse Code Modulated (PCM) stream. 2.2 Ringing The ringing signal is generated by switching the SLIC into ringing mode, by setting the RM pin high, and then toggling the F/R pin at the required frequency and cadence. The toggling of the F/R pin produces a balanced signal at Tip and Ring. These signal waveforms are shown in Figure 4. Ringing voltage of approximately 65Vrms is applied to a single handset. It is important that the RM pin is only set high during ringing and that this pin is set low at all other times. Applications Note AN1170-14 provides advice on how to implement this requirement. During ringing the integral DC/DC converter automatically switches to produce a battery voltage of -72V. This will produce greater than 40Vrms into a REN of 3. The slope of the edges on the ringing waveform is set internally to give the correct waveform with 20Hz to 25Hz ringing frequency. When an “off-hook” condition occurs during ringing, the ring-trip circuit on the Ag1170 senses the loop current flowing and signals the off-hook condition on the SHK output. The SHK signal must be “de-bounced” (by the controlling processor) for 10ms to remove any spurious pulses. The DC/DC controller limits the power. The Ag1170 will operate continuously with a ring-trip load. The ring-trip function will operate up to a loop resistance of typically 800R (including telephone). It is © Silver Telecom 2006 3.1 Transmit and Receive Gain. The gain in both the transmit direction (Tip/Ring to VOUT) and the receive direction (VIN to Tip/Ring) is set to 0dB. Normally any gain adjustments required by the user can be made by programming the Codec. 3.2 The 2 Wire Impedance. The 2 Wire impedance at Tip/Ring of the Ag1170 is set to 600R. It requires no external programming resistors. The 2 Wire impedance of the Ag1170-P can be programmed to the required value by connecting components across pins ZT1-ZT2. The impedance ratio for ZT is 100. Resistors should be multiplied by the ratio and capacitor values divided by the ratio to obtain the required programming values. E.g. for 600R impedance, fit 60K resistor (nearest value = 62K). Further details on the programming of the Ag1170P are contained within Applications Note: AN1170-1. 6 V1.9 September 2006 Data Sheet Ag1170 +5V / +3.3V LOW POWER RINGING SLIC Conditio n 1 - DC ope rat ion Sig nal 1 0 1 0 NO TE: SH K S HO ULD B E DE- BO UNC ED FO R 1 0ms No tes INP UT RM No r in gin g OU TP UT SH K Of f hoo k det ected Of f Ho ok Conditio n 2 - Ring i ng O n- hook 1 1 sec 3 s ec 1 s ec Conditio n 3 - Ring i ng/ Off - hook 3 s ec RM 0 1 F/R (inp ut ) 0 SHK 1 0 Th e p h o n e go es o ff h o o k, an d SH K is d etected at po in t A (lead in g ed g e). RM mu s t b e s witch ed lo w in < 5 00 ms (p oint B) , an d th e r ing in g cad en ce s ho u ld b e re mo v ed fro m F/R. . A s lo ng as th e teleph on e is o ff h o ok, S H K will re ma in h igh . A B Figure 4: Ringing Signal Waveforms If F/R is held at logic 1 (forward) the d.c. voltage at Tip is positive with respect to Ring. If F/R is taken to logic 0 the voltage polarity is reversed. 3.3 Network Balance Impedance. The network balance impedance ZB of the Ag1170 is set to 600R and it requires no external programming resistors. To programme the ZB for the Ag1170P components are connected from the VIN pin to the ZB pin. For ZB = ZT use a 100K resistor in series with a 47nF capacitor. Further details on the programming of the Ag1170P are contained within Applications Note: AN1170-1. 3.5 On Hook Transmission. The Ag1170 is capable of on-hook transmission. This means analog signals can be transmitted from VIN through Tip and Ring and onto the line even when no loop current is flowing. This can be used when sending Caller Line Identification (CLI) information or for other “no ring” calls. The Ag1170 will provide on hook transmission with a high impedance on Tip/Ring or with AC loads down to 600R. 3.4 Tip & Ring Polarity Reversal. The Ag1170 can reverse the battery voltage polarity at Tip and Ring via the F/R pin. © Silver Telecom 2006 7 V1.9 September 2006 Data Sheet R2 Ag1170 +5V / +3.3V LOW POWER RINGING SLIC C4 +5 + 5V/+3.3V + + C2 C1 +V PW R GNDPWR +V A C3 GNDPW R/ GNDA Ag1170 D2 F/R To Mic r o Contr oller TIP D3 D4 TIP SHK RM Silver T EL EC O M RING V OUT PD V IN C5 To Codec C6 RING D5 D1 To other circ uits R1 T1 Hi gh in pu t fo r Po we r Do wn . Lo w In put for fre e run Components C1, C3, C5, C6 = 100nF C2 = 220uF, 10V, Rubycon ZL (or equivalent low ESR) C4 = 100uF, 6.3V R2 = 10R D1 = BZT03C82 or P6KE82 (only one needed per line card) D2 – 5 = 1N4004 or MB4S bridge R1 = 10K T1 = BC846 Figure 5: Typical Connection Diagram 4.0 Switch Hook Detect Level When the subscriber goes “off-hook” loop current will begin to flow. If this current is above the detection threshold (10mA) the switch hook output, SHK, will switch to a logic 1. It is recommended that software or hardware de-bouncing of the switch hook signal is used. This is to avoid short pulses which can cause a false switch hook output, triggering the incorrect system response. During loop disconnect dialling, SHK will pulse between logic 1 and logic 0 to indicate the digits being dialled. Again it is recommended that software debouncing is used to avoid false detection of digits. 5.0 Protection of the Ag1170 SLIC 5.1 Thermal Protection Should the SLIC be operated incorrectly, for example by accidentally shorting Tip and Ring to each other or to ground, the power dissipation is automatically limited by the DC/DC converter This feature means that the SLIC will always operate within its power limits, without overheating. When operating on very short lines the battery voltage is regulated to a low value. This limits the power dissipation and ensures the Ag1170 operates with a minimum temperature rise. © Silver Telecom 2006 8 V1.9 September 2006 Data Sheet Ag1170 +5V / +3.3V LOW POWER RINGING SLIC The Ag1170 provides for a 2 wire impedance and a network balance impedance of 600Ω. For other impedances the Ag1170-P can be used. This can be programmed using external components (Section 3.2 and 3.3). 5.2 Lightning and Power Cross Protection. It is usual for the Ag1170 to be used in “on-premise” applications, such as SOHO, CTI and VoIP. In this case power cross and lightning protection is not required. In most ‘off-premise’ applications, a subscriber circuit will be required to withstand over voltage conditions which could be caused by lightning or overhead power cables striking the telephone cables. It is therefore normal in “off-premise” applications to provide primary and secondary protection circuits to prevent damage to the SLIC. The Ag1170 has been designed to be able to use low cost protection components, a typical circuit is shown in Figure 5. This circuit is suitable for most “onpremise” applications. With some additional components, the Ag1170 will meet UL60950 requirements: a series element should be added - a combination of a fuse (e.g. 350mA, Bussman C515 or Littlefuse 220003) and a surge resistor (25R typically). Alternatively a Teccor F1250T or F0500T fuse may be used without a surge resistor. For ITU-T K20 power cross protection, a PTC thermistor (eg. type JH330L) of 30R is suitable. The lightning protection is provided by steering diodes connected to 0V and upgrading D1 to a Tranzorb device (Motorola or STM 1.5KE82A). For lightning and UL60950 power cross protection, D1 should be upgraded further (General Semiconductor or Semitron 5KP75). Just one Tranzorb is needed per linecard. 7.1 DC Supply Voltage During operation the DC Supply Voltage MUST be regulated within the limits shown in the Electrical Characteristics – Section 9.0 of this datasheet. Use of a “clean” power supply is extremely important. Should the VCC supply rail go above the Absolute Maximum Rating of 5.5V, for even a short time, then permanent damage to the Ag1170 is likely to result. We also advise that the designer performs a full system evaluation, under all possible performance conditions, to ensure that the VCC Maximum rating is not exceeded. In some applications, additional EMI suppression may be needed. In this instance 3 capacitors can be added to filter out the higher frequencies of the DC-DC converter. See figure 6 for details. Ag 1170 Ag1170 Tip Ring 1nF 1nF ZB 100pF 6.0 Approvals. It can be seen from the Electrical Characteristics given on subsequent pages that the SLIC has been designed to meet the equipment standards of as many major public telephone authorities as possible. It is the responsibility of the equipment design authority to ensure that their system meets the requirements of the relevant regulatory bodies. Every effort is made to ensure that Silver Telecom products are compliant with the latest standards. VOUT Figure 6: Optional EMI Suppression 7.0 A Typical Application. The Ag1170 has been designed to interface to any Codec. Applications drawings for many codecs and DSP chips are available. Please contact Silver Telecom or visit our website www.silvertel.com. An example is shown in figure 5. The status outputs from the SLIC are passed to the micro-controller. These signals can then be processed as necessary by the system software. The audio signals which are on the 4 wire side of the connection are coupled by 100nF capacitors to avoid d.c. level problems between the two devices. © Silver Telecom 2006 9 V1.9 September 2006 Data Sheet Ag1170 +5V / +3.3V LOW POWER RINGING SLIC PD is a sensitive node. Keep the tracking as short as possible. Particularly if connecting a transistor to this pin. 8.0 Layout Considerations. 8.1 Power and Ground Figure 7 gives an example of the tracking needed for the Ag1170. Tracks to the +VPWR and GNDPWR should be made as thick as possible. To maximise the performance of the device, signal tracks should be kept as short as possible. A low impedance (ESR) capacitor must be used for C2. To reduce DC/DC noise capacitors up to 10nF may be connected to ground at Tip and Ring. 8.2 Impedance ZT1, ZT2 and ZB are sensitive nodes. Keep the tracks as short as possible. POWER FILTER 22 0u F, 1 0 V ( C2) Mu st b e lo w ES R Tr acks for +V PW R and +V A, and for GNDPW R and GNDA ar e joined at t he input s ide of the pow er f ilter . 0. 1u F, 16 V ( C1 ) 20 21 codec to o ther circu it ry GN DP W R GN DP W R F/ R ZB ZT2 GN DA 8 9 +VP W R +VP W R SH K VOU T VIN ZT1 +VA 1 Pin Na me s Bottom Vie w 7 Tip (A ) Ring (B) IC PD NC NC RM 10 R0 (R1) to o th er circu it ry 10 0u F, 6. 3 V ( C4) 0. 1u F, 25 V ( C3 ) Figure 7: Typical Layout © Silver Telecom 2006 10 V1.9 September 2006 Data Sheet Ag1170 +5V / +3.3V LOW POWER RINGING SLIC 9.0 Electrical Characteristics. 9.1 Absolute Maximum Ratings* All Voltages are with respect to ground unless otherwise stated. Parameter 1 2 3 4 DC Supply Voltage Maximum Power Dissipation, Off Hook @ 25oC Storage Temperature Duty Cycle for RM(H) Symbol VCC PSLIC TS Min -0.3 Max 5.5 1.2 Units V W O -40 +100 33 C % *Exceeding the above ratings may cause permanent damage to the product. Functional operation under these conditions is not implied. Maximum ratings assume free air flow. 9.2 Recommended Operating Conditions* All Voltages are with respect to ground unless otherwise stated. Parameter 1 2 3 DC Supply Voltage (5V Version) DC Supply Voltage (3.3V Version) Operating Temperature Symbol VCC VCC TOP Min 4.75 3.10 0 Typ 5.0 3.30 25 Max 5.25 3.50 70 Units V V O C *Typical figures are at 25°C with nominal +5V/+3.3V supplies and are for design use only. They are not guaranteed It is important that the user performs a full system evaluation, under all possible performance conditions, to ensure that the VCC Maximum rating is not exceeded. © Silver Telecom 2006 11 V1.9 September 2006 Data Sheet Ag1170 +5V / +3.3V LOW POWER RINGING SLIC 9.3 DC Electrical Characteristics. DC Characteristic 1 Supply Current, on- hook Ag1170-5 Ag1170-3 Supply current ringing 1 REN Ag1170-5 Ag1170-3 Supply current, off-hook Ag1170-5 Ag1170-3 Supply current during ring trip (