AG1171

AG1171 ETC2

Document overview

• Manufacturer or author: Provided By www.digicamel.com(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 16

Technical content

V1.0 Dec 2006 Data Sheet Silver T E L E C O M 1. Features ¾ A highly featured low power SLIC in a 14 pin SIL format. ¾ Integral high efficiency DC/DC converter. Single supply voltage: +3.3V to +5.0V. ¾ Highly integrated with an on-board ringing generator. ¾ Tip/Ring polarity reversal. On-Hook Transmission for caller line ID. ¾ Suitable for FCT applications. ¾ Easy to use, with a minimum number of external components. ¾ Simplified protection in “on-premise” applications. ¾ Silver Telecom “design-in” assistance 2. Description The Silv er Telecom Ag1171 is a single Subscriber Line Interface Circuit (SLIC) in a 14 pin single in line (SIL) format. The combination of features and packaging offers extremely efficient use of board area, saving signif icant system size and cost, mini mising time to market for Telephony Systems developers. The Ag1171 has been designed to work with loop lengths of typi cally 1.0km (470R including telephone). The Ag1171 has integral dc/dc converter and ringing generation thus providing all the line powering requirement s from a single supply. The Ag1171 requires a minimum of exter nal components, making it ideal for low line count, s hort loop length applic ations, such as WLL Terminal (WLL), Fixed Cellular Terminals (FCT), Fixed Wireless Terminals (FWT) and Internet Telephony (VoIP). Ag1171 +3.3V / +5.0V Low Power Ringing SLIC PbPb © Silver Telecom 2006

V1.0 Dec 2006 Data Sheet Ag1171 +3.3V / +5.0V Low Power Ringing SLIC 3. Ag1171 Product Selector Part Number Impedance Package Supply Voltage Marking Ag1171 600 ohm SIL 3.3 to 5.0 Volt Table 1: Ordering Information Figure 1: Block Diagram © Silver Telecom 2006 3

V1.0 Dec 2006 Data Sheet Ag1171 +3.3V / +5.0V Low Power Ringing SLIC Ag1171Ag1171 Ag1171Ag1171 Ag1171Ag1171Ag1171Ag1171 Figure 2: Ag1171 Package Format © Silver Telecom 2006 4

V1.0 Dec 2006 Data Sheet Ag1171 +3.3V / +5.0V Low Power Ringing SLIC 4. Pin Description Pin # Name Description 1 RING (B) Ring. Connects to the subscriber line Ring. 2 TIP (A) Tip. Connects to the subscriber line Tip. 3 F/R Forward/Reverse. A logic (L) will reverse the Tip and Ring voltage polarities. F/R is toggled to produce the ringing output. 4 RM Ringing Mode. Sets bias conditions during ringing. Must be set to logic (H) during ringing. Logic (L) for other modes. 5 SHK Switch Hook. Indicates an off-hook condition when at logic (H). 6 NC No Connection. Do not connect to this pin. 7 NC No Connection. Do not connect to this pin. 8 NC No Connection. Do not connect to this pin.

9 VIN

Audio In. Analog input signal from the Codec (which is output on Tip and Ring). Connect via a 10nF capacitor

10 VOUT

Audio Out. This is the analog output signal (from Tip and Ring) to the Codec. Connect via a 100nF capacitor. 11 NC No Connection. Do not connect to this pin. 12 GNDPWR DC/DC Ground. Ground input for the DC/DC converter. 13 +VPWR DC/DC Supply. +5.0V or +3.3V input for the DC/DC converter. 14 PD Power Down DC/DC Converter. A logic (L) on this pin powers down the Ag1171. DO NOT put logic (H) on this pin. © Silver Telecom 2006 5

V1.0 Dec 2006 Data Sheet Ag1171 +3.3V / +5.0V Low Power Ringing SLIC 5. Functional Description 5.1. Line Interfacing As well as being us ed in an electrically demanding environment, the needs of different applications and regulatory standards means t hat the SLIC must be flexible, and hav e facilities to ensure robust performance. The Ag1171 SLIC provides a complete and flexible interface to the telephone. 5.2. Battery Feed The Ag1171 has an integral DC/DC converter, which generates the battery voltage in the device. This means that only a single supp ly of between +3.3V to +5.0V is needed, unlik e conventional SLICs which will also need a battery voltage of any thing 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 gener ated from the positive supply rail. This provides a 48V battery feed to the line driver, which is adjusted automatically to match line conditions. In Forward mode the Ring voltage is negative with respect to the Tip voltage. Power efficiency is good, because the line is sup plied with only as muc h power as is needed. Little excess heat is generated, even on short lines. The loop current is pre-set to a constant 30mA, under the conditions s hown in Section 10.3 of this datasheet, which specifies the ‘DC Electrical Characteristics’ for the Ag1171. 5.3. Ringing The ringing signal is generated by switching t he SLIC into ringing mode, by setting the RM pin high, and then toggling the F/R pin at the required frequency and cadence. T he toggling of the F/R pin produc es a balanc ed signal at Tip and Ring. These signal waveforms are shown in Figure 3. Ringing voltage of approximately 60Vrms is applied to a single telephone set. It is important that the RM pin is only se t high during ringing and that this pin is set low at all other times. During ringing the integral DC/DC converter is switched by RM (H) to produce a battery voltage of 72V. This will prod uce greater than 40Vrms into 3 telephon es (with to ne ringers). The slope of the edges on the ri nging wa veform is set internally to give the correct waveform with 20Hz to 25Hz ringing frequency. When an “off-hook” condition oc curs during ringi ng, the ring-trip circuit on the Ag1171 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 p ulses. The DC/DC c ontroller li mits the power. The Ag1171 will oper ate continuously with a ring-trip load (but this is not recommended as the power dissipation is high). The ring-trip function will operate up to a loop resistance of typically 470R (including 300R telephone). © Silver Telecom 2006 6

V1.0 Dec 2006 Data Sheet Ag1171 +3.3V / +5.0V Low Power Ringing SLIC Condition 1 - DC ope ration Signal Notes INPUT RM No ringing OUTPUT SHK Off hook detected Off Hook NOTE: SHK SHOULD BE DE-BOUNCED FO R 10ms Condition 2 - Ringing On-hook RM F/R (input) SHK Condition 3 - Ringing/Off-hook AB The phone goes off hook, and SHK is detected at point A (leading edge). RM must be switched low in <500ms (point B), and the ringing cadence should be removed from F/R.. As long as the telephone is off hook, SHK will remain high. 1 sec 3 sec 1 sec 3 sec Condition 1 - DC ope ration Signal Notes INPUT RM No ringing OUTPUT SHK Off hook detected Off Hook NOTE: SHK SHOULD BE DE-BOUNCED FO R 10ms Condition 2 - Ringing On-hook RM F/R (input) SHK Condition 3 - Ringing/Off-hook AB The phone goes off hook, and SHK is detected at point A (leading edge). RM must be switched low in <500ms (point B), and the ringing cadence should be removed from F/R.. As long as the telephone is off hook, SHK will remain high. 1 sec 3 sec 1 sec 3 sec Condition 1 - DC ope ration Signal Notes INPUT RM No ringing OUTPUT SHK Off hook detected Off Hook NOTE: SHK SHOULD BE DE-BOUNCED FO R 10ms Condition 2 - Ringing On-hook RM F/R (input) SHK Condition 3 - Ringing/Off-hook AB The phone goes off hook, and SHK is detected at point A (leading edge). RM must be switched low in <500ms (point B), and the ringing cadence should be removed from F/R.. As long as the telephone is off hook, SHK will remain high. 1 sec 3 sec 1 sec 3 sec Figure 3: Ringing Signal Waveforms 5.4. Power Down and Synchronisation The DC/DC converter can be switched off by applying a logic (L) level to the PD input. The SLIC takes 50ms to power up from this state. Logic outputs are not valid during this tim e. When using the power down function, it is recommended that the SLIC is polled (power ed up periodically) to check for SHK (the subscriber has gone off-hook). If Power Down mod e is not required, the PD pin should be left open circuit. The PD in put should not be taken to a logic (H) as this may damage the SLIC. Connec ting to PD via a diode will ensure it is never taken (H). 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 64kHz square wav e (with 50:50 mark space) should be inputted to the PD pin. See Applications Note: AN1171- 1, for further details. © Silver Telecom 2006 7

V1.0 Dec 2006 Data Sheet Ag1171 +3.3V / +5.0V Low Power Ringing SLIC 5.5. The 2-4 Wire (hybrid) Conversion The Ag1171 SLIC transmits and receives bal anced 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 connec ted to a Codec or telephony DSP for conversion of audio to and from a digital format. 5.6. 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 ad justments required by the user can be made by programming the Codec or telephony DSP. 5.7. The 2 Wire Impedance The 2 Wire impedance at Tip/Ring of the Ag117 1 is set to 600R. It requires no external programming resistors. 5.8. Network Balance Impedance The network balance impedanc e ZB of the A g1171 is set to 600R and it requires no external programming resistors. 5.9. Tip & Ring Polarity Reversal The Ag1171 can reverse the battery voltage polarity at Tip and Ring via the F/R pin. If F/R is held at logic ( H) (Forward) the d.c. voltage at Ring is negative with r espect to Tip. If F/R is taken to logic (L) (Reverse) the voltage at Ring is positive with respect to Tip. 5.10. On Hook Transmission The Ag1171 is capable of on-hook transmission if an external r esistor is fitted between pins 1 (Ring) and 2 (Tip). This means analog signals can be transmitted from VIN through Tip and Ring and onto the line even when no external loop cu rrent is flowing. This can be used when sending Ca ller Line Identification (CLI) information or for other “no ring” calls. The Ag1171 will provide on hook transmission of audio signals up to 0dBm (0.775V) with a high impedance on Tip/Ring or with AC loads down to 600R. To achieve this the external bias resistor should have a value of 20Kohms. This will increase the VPWR idle current by 35ma. A larger value of resistor will reduce the idle current but the maximum audio s ignal which can be transmitted will be reduced in proportion e.g. a 39Kohm bias resistor wil l allow audio signals up to –6dBm (0.387V) with an increase in idle current of 18mA. © Silver Telecom 2006 8

V1.0 Dec 2006 Data Sheet Ag1171 +3.3V / +5.0V Low Power Ringing SLIC Components C1, C3 = 100nF C4 = 10nF C2 = 470uF, 16V Aluminium Electrolytic (standard type) R1 = External DC bias resistor (required for CLI) typically 20K to 39K D1 = BZT03C82 or P6KE82 (only one needed per line card) D2 – 5 = 1N4004 or MB4S bridge D6 = 1N4148 or BAS16 Figure 4: Typical Connection Diagram 5.11. Switch Hook Detection When the subscriber goes “off-hook” loop current will begin to flow. If this current is above the detection threshold the swit ch hook o utput, SHK, will switch to a logic (H). It is recommended that software or har dware de-bouncing of the swit ch hook signal is used. This is to avoid short pulses which can caus e a false switch hook output, triggering the incorrect system response. During loop disconnect dialling, SHK will pulse betwe en logic (H) and logic (L) to indic ate the digits being dialled. Again it is re commended that software de-bouncin g of the pulse edges is used to avoid false detection of digits © Silver Telecom 2006 9

V1.0 Dec 2006 Data Sheet Ag1171 +3.3V / +5.0V Low Power Ringing SLIC 6. Protection of the Ag1171 SLIC 6.1. Thermal Protection Should the SLIC be operated incorrectly, for example by accidentally shorting Tip and Ring to each other or to ground, the power diss ipation is automatically limited by the DC/DC converter This feature means that t he SLIC will always operate withi n it s power limits, without overheating. When operating on ve ry short lines the battery voltage is regulated to a low value. This limits the power dissipation and ensures the Ag1171 operates with a minimum temperature rise. 6.2. Lightning and Power Cross Protection The Ag1171 is designed for use short loop “on-premise” applications, such as FCT, FW T, WLL and VoIP. In this case power cross and lightning protection is not required. The only protection which should be required is for ESD (Electro Static Discharge) caused by handling during installation. The Ag1171 has been designed to be able t o use low cost ESD protection components. A typical c ircuit is shown in F igure 4. T his circuit is suitable for most “on-premise” applications. 7. Typical Application The Ag1171 has been designed to interface to telephony Codec s or DSPs. Applications drawings for many codecs and DSP ch ips are available. Please contact Silver Telecom or visit our website www.silvertel.com. An example is shown in figure 4. The status outputs from the SL IC are passed to the micro- controller. These signals c an 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 capacitors to avoid d.c. level problems between the two devices. 8. DC Supply Voltage During operation the DC Supply Voltage MUST be regulated within the limits shown in the Electrical Characteristics – Section 10.0 of this datasheet. Use of a “clean” power supply is extremely important. Should the VCC supply rail go above the Absolute Max imum Rating of 7.0V, for even a short time, then permanent damage to the Ag1171 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. © Silver Telecom 2006 10

V1.0 Dec 2006 Data Sheet Ag1171 +3.3V / +5.0V Low Power Ringing SLIC 10. Electrical Characteristics 10.1. Absolute Maximum Ratings* Parameter Symbol Min Max Units 1 DC Supply Voltage VCC -0.3 7.0 V 2 Maximum Power Dissipation, Off Hook @ 25oC PSLIC 1.2 W

3 Storage Temperature TS -40 +100 OC

4 Duty Cycle for RM(H) 33 %

*Exceeding the above ratings may cause permanent damage to the product. Functional operation under these conditions is not implied. Maximum ratings assume free airflow. 10.2. Recommended Operating Conditions* All Voltages are with respect to ground unless otherwise stated. Parameter Symbol Min Typ Max Units 1 DC Supply Voltage VCC 3.1 5.5 V

2 Operating Temperature TOP 0 25 70 OC

*Typical figures are at 25°C with nominal +5.0V/+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 12

V1.0 Dec 2006 Data Sheet Ag1171 +3.3V / +5.0V Low Power Ringing SLIC 10.3. DC Electrical Characteristics* DC Characteristic Sym Min Typ* Max Units Test Comments Supply Current, on-hook @ 5.0V @ 3.3V Ivpwr 105 mA mA CLI bias resistor not fitted Supply current ringing 1 REN @ 5.0V @ 3.3V IRINGING 330 350 480 500 mA mA RLOOP = 0R Load = 1 REN Supply current, off-hook @ 5.0V @ 3.3V IACTIVE 290 360 400 450 mA mA RLOOP =0R Load = 300R Supply current during ring trip (<1 sec max) @ 5.0V @ 3.3V 330 350 mA mA RLOOP =0R Load = 300R

5 Supply current in power down IPD 7

@ 5.0V @ 3.3V

6 Wake-up time 50 ms

7 SHK debounce time 15 ms

Constant current feed to line @ 5.0V @ 3.3V ILOOP mA mA Load = 300R

9 Tip/Gnd or Ring/Gnd or

Tip&Ring/Gnd overcurrent 45 mA mA RM = L RM = H Off-Hook detect @5.0V Output Low Voltage Output High Voltage VOL VOH 4.5 0.5 V V Off-Hook detect @3.3V Output Low Voltage Output High Voltage VOL VOH 2.8 0.5 V V 100uA max output (with 3.3k internal pull-up resistor) VIL VIH 3.5 0.5 V V @ 5.0V Control Inputs, F/R, RM Input Low Voltage Input High Voltage VIL VIH 2.0 0.5 V V @ 3.3V Control Inputs, F/R, RM Input low current Input high current IIL IIH -0.5 -0.5 0.5 0.5 mA mA VIL VIH 2.0 0.5 V V @ 5.0V Control Inputs, PD Input Low Voltage Input High Voltage VIL VIH 2.0 0.5 V V @ 3.3V © Silver Telecom 2006 13

V1.0 Dec 2006 Data Sheet Ag1171 +3.3V / +5.0V Low Power Ringing SLIC DC Characteristic Sym Min Typ* Max Units Test Comments Control Inputs, PD Input low current Input high current IIL IIH -0.5 -0.5 0.5 0.5 mA mA 1) All DC Electrical Characteristics are over the Recommended Operating Conditions with VCC at +5.0V +1%,or +3.3V +1%, unless otherwise stated. 2) Operating currents are dependent on the users application. *Typical figures are at 25°C and are for design aid only. Not Guaranteed 10.4. AC Electrical Characteristics* AC Characteristic Sym Min Typ* Max Units Test Comments

1 SHK Detect Time 5 ms No Ringing

2 Ring Trip Capability 470 ohm Includes

3 Input Impedance at VIN 60 kohm

4 Output impedance at VOUT 10 ohm

5 Ringing Capability at 40Vrms 3 phone note 3

6 Ringing voltage 65 Vrms No load @

7 Absolute Voltage Gain, 2 Wire

-0.75 0 0.75 dB Off-Hook

8 Absolute Voltage Gain VIN to

2Wire -0.75 0 0.75 dB Off-Hook Relative Gain. Referenced to 1kHz. 2Wire - VOUT, VIN - 2Wire -0.5 0.5 dB Over frequency range 300 to 3400 Hz

10 Overload Distortion @2 Wire

OD 0.5 @+3dBm, 1kHz @+6dBm, 1kHz

11 Idle Channel Noise NC 5 18 dBrnC @2 Wire & VOUT

13 Return Loss RL 18 dB 300-3400Hz

14 Transhybrid Loss THL

15 Load on VOUT 10 kohm Coupling

capacitor = 100nF

16 Tip-Ring Reversal Settling

Time 50 ms To within +20% of set ILOOP 3) This applies to 3 phones with tone ringers or 2 phones with mechanical bells. *Typical figures are at 25°C and are for design aid only. © Silver Telecom 2006 14

V1.0 Dec 2006 Data Sheet Ag1171 +3.3V / +5.0V Low Power Ringing SLIC 11. Package 12.0mm 61mm 3.0 Ag1171Ag1171 0.6 ± 0.05 12.0mm max 6.5mm Dimensions are nominal unless otherwise stated 12.0mm 61mm 3.0 Ag1171Ag1171Ag1171Ag1171 0.6 ± 0.05 12.0mm max 6.5mm Dimensions are nominal unless otherwise stated Ag1171Ag1171 pin 1 Ring (B) Tip (A) FR RM SHK NC NC NC VIN VOUT NC GND PWR VPWR PD Ag1171Ag1171Ag1171Ag1171 pin 1 Ring (B) Tip (A) FR RM SHK NC NC NC VIN VOUT NC GND PWR VPWR PD Silver Telecom recommends the use of 2.54mm sockets, especially on prototype and pre production boards. Recommended PCB hole diameter = 1.1 ± 0.05 mm Information published in this datasheet is believed to be correct and accurate. Silver Telecom assu mes no liability for errors which may occur or for liability otherwise arising out of use of this information or infringement o f patents which may occur as a result of such use. No license is granted by this document under pat ents owned by Silver Telecom or licensed from thir d parties b y Silver Telecom. The products, their specification and information appearing in this document are subject to change by Silver Telecom without notice. © Silver Telecom 2006 15

V1.0 Dec 2006 Data Sheet Ag1171 +3.3V / +5.0V Low Power Ringing SLIC © Silver Telecom 2006 16