V1.4 September 2006 Data Sheet Ag2130 Silver LOW COST PSTN INTERFACE TELECOM FEATURES Pb • A highly featured PSTN Interface (COIC, FXO, DAA, Trunk Interface) in a single 12mm high SIL device. • +5V or +3.3V supply. • Transformer isolation providing high common-mode rejection (CMRR) for use in un-grounded systems. • Highly integrated with on-board loop switch and diode bridge. • Loop start circuit, ringing detect, detection and parallel phone detect. line • On-hook reception. • Meets requirements of FCC Pt68. • Approved to: EN 60950-1:2001 IEC60950-1: First Edition 2001 AS/NZ60950-1: 2003 UL60950-1: 2003 1st Edition CSA 22.2 No.60950-1-03 1st Edition • Low cost power cross protection. • Programmable d.c. mask, line and network impedances, allows use in any market. • Silver Telecom “design-in” assistance. DESCRIPTION The Ag2130 is a self-contained highly integrated PSTN Interface Circuit in a single SIL module, which complies with ROHS requirements. In addition to the features listed, the Ag2130 allows flexible programming of many functions, including the dc voltage mask and impedances. The Ag2130 meets international safety and regulatory requirements. © Silver Telecom 2006 The device requires a minimum of external components and has been specified for ease of use, to allow reduced time to market. The Ag2130 is designed for all applications, including those where there is a high level of common mode interference, such as PABX, long loop applications and systems without a ground connection. Ag2130 V1.4 September 2006 Data Sheet LOW COST PSTN INTERFACE Ordering Information Ag2130S Fully featured Trunk in SIL package (RoHS Compliant) Silver Ag2130 T EL EC O M Figure 1: Ag2130S - SIL Packaging Format VCC DMa DMb Tip Ring GND ZT1 ZT2 VTR Power Management Line Termination & Loop Switch ZB VOUT 2-4 Wire Converter VIN RS Supervision LSC Anode Gate Cathode Figure 2: Functional Block Diagram © Silver Telecom 2006 2 Ag2130 V1.4 September 2006 Data Sheet LOW COST PSTN INTERFACE 1.0 Pin Description 1.1 SIL Pin-Out Pin # Name 1 RING (B) 2 TIP (A) 3 CATHODE 4 ANODE 5 GATE 6 DMb DC Mask b. A resistor is connected between this pin and DMa to adjust the d.c. characteristics of the termination. 7 DMa DC Mask a. A resistor is connected between this pin and DMb to adjust the d.c. characteristics of the termination. 8 nc No connect. This pin is not used and can be left open circuit. 9 VIN Audio In. This is the analog input signal from the Codec (which is output on Tip and Ring). Connected via a 100nF capacitor. 10 VOUT Audio Out. This is the analog output signal (from Tip and Ring) to the Codec. Connected via a 100nF capacitor. 11 LSC Loop switch control. Applying a logic 1 closes the integral loop switch. 12 GND Analog ground. Normally connected to system ground. 13 VCC Positive supply. Must be connected to +5V or +3.3V. 14 nc No connect. This pin is not used and can be left open circuit. 15 ZB Balance network. The network balance matching components are connected between this pin, VIN and GND. 16 ZT2 2 Wire matching network 2. The 2 wire impedance matching network is connected between this pin and ZT1. The compensation impedance Zc is connected between this pin and ZB. 17 ZT1 2 Wire matching network 1. The 2 wire impedance matching network is connected between this pin and ZT2. 18 RS Ringing signal. A logic 0 indicates the presence of ringing voltage on the telephone line. Toggles at ringing frequency. 19 VREF Reference voltage output. Used with VTR to detect parallel phone. VREF is approximately +VCC/2. Connect 100µF to GND from this pin. 20 VTR Tip/Ring voltage. Indicates the voltage between Tip/Ring. Divided by 220 and relative to Vref. © Silver Telecom 2006 Description Ring. Connects to the subscriber line Ring. Tip. Connects to the subscriber line Tip. Cathode. For power cross protection connect to protection device cathode. Anode. For power cross protection connect to protection device anode. Gate. For power cross protection connect to protection device gate. 3 Ag2130 V1.4 September 2006 Data Sheet 2.0 LOW COST PSTN INTERFACE Line Interfacing is done when the terminating equipment wishes to begin a call or in response to the reception of the ringing signal. The LSC pin can be controlled by the output drive pins of a codec or from a micro controller device. The Ag2130 line interface provides a flexible and robust interface to the telephone line. It has been designed to meet regulatory standards whilst providing a space and power efficient solution. 2.1 D.C. Termination. 2.2.2 Ringing Detection and Sensitivity. Any equipment terminating a telephone line must present the correct d.c. resistance to the line. This ensures that the correct loop current flows for detection of the off-hook condition. It avoids excessive power dissipation in the Subscriber Line Interface (SLIC) and the Subscriber’s equipment and minimises the size of power supply needed to drive the SLIC. The terminal equipment must be capable of detecting and responding to an incoming call in the same way as a telephone set. The termination circuitry must, therefore, detect the presence of the ringing signal. The Ag2130 provides an output, RS, which indicates the presence of ringing by switching from a logic 1 to logic 0. The RS output will toggle at the ringing frequency. A capacitor to ground can also be added if ringing cadence is needed rather than the ringing frequency. The Ag2130 has been designed to meet the requirements of many network operators. This is done by making the d.c. characteristic adjustable. This is controlled by connecting the DM pins on the line side of the circuit. Table 1 shows how these are connected. The sensitivity to ringing is set internally to 22VRMS when VCC is +5V. Table 1 Set Up of the DM Pins Market DMa DMb North America (EIA 464, Resistive) Connect together through 390K resistor Europe (CTR21) Connect together through 390K resistor Far East Connect together through 390K resistor 2.2 3.0 The 2-4 Wire (Hybrid) Conversion. The Ag2130 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 signal at VIN. VOUT and VIN are normally connected to a codec (via d.c. blocking capacitors) for conversion to and from a Pulse Code Modulated (PCM) stream. Signalling and Loop Status. The Ag2130 provides facilities to monitor and control the telephone line. This allows the device to be used with a variety of loop signalling schemes and minimises the number of external components needed to implement a complete line interface. 3.1 Transmit and Receive Gain. The off-hook gain in both the transmit and receive directions is set at typically 0dB. Any gain adjustments can be made using the codec functionality. This is either by hardware or software depending upon the codec used. In order to implement ground start applications please contact Silver Telecom or our local representative. 2.2.1 The On-Board Loop Switch The Ag2130 implements the loop start protocol when initiating and answering a call. This means that a switch must be closed to allow loop current to flow, signalling to the SLIC that the terminating equipment has gone “off-hook”. This has been done historically by a relay. The Ag2130 uses an integral optically isolated switch to do this, eliminating the need for an external relay, so space and cost is saved for the user. The on-board Loop Switch is controlled by the LSC pin. A logic 1 applied to the pin closes the loop switch. This © Silver Telecom 2006 4 Ag2130 V1.4 September 2006 Data Sheet LOW COST PSTN INTERFACE eg. 2-wire Impedance ZT ZC Network Balance Impedance Zb1 Zb2 Zb3 C3 Notes 1 600Ω 300Ω 47K 600Ω 100K 0R --- --- USA Short Line, Far East, Middle East 2 CTR21 750R// 220nF 68K// 680pF CTR21 220K// 680pF 5.1K --- --- Europe 3 900Ω 620Ω 62K 900Ω 220K 0R --- --- USA Long Line, Brazil 4 600Ω 300Ω 47K 100R +1K//100nF 39K 39K 0R 1.5nF Japan Table 2: Line and Network Balance Impedance Examples coefficients a model of the Ag2130 must be used. This file, in .CIR format is available on request from Silver Telecom or one of our representatives. 3.2 The 2 Wire Impedance The input impedance, ZIN, of the Ag2130 can be programmed. This is achieved by connecting an impedance matching network between ZT1 and ZT2. This network is the line impedance to be matched minus 300Ω. For example to match 600Ω, fit a 300Ω resistor. Other common line impedances, and the corresponding programming components are listed in Table 2. Full details on how the Codec is programmed must be obtained from the Codec manufacturer. 3.3 Network Balance Impedance The setting of the network balance impedance is very similar to that of the 2 wire impedance. Again this can be done by programming of the codec, using the .CIR file, or it can be done by hardware components. In addition to the programming network, an impedance, ZC must be fitted between ZT2 and Zb to provide gain and frequency compensation. 3.4 An alternative method of programming the 2 wire impedance is to choose a codec where the internal filter characteristics can be programmed to provide the correct matching. In order to generate the filter On-Hook Reception The need for data exchange when on-hook is becoming increasingly common. This may be required for Caller Line I.D. or for telemetry purposes. The VCC ZT ZB2 ZB3 ZC C3 GND ZB1 VCC DMa ZT1 ZT2 Ag2130 R1 Zb VIN VOUT C1 C2 DMb For 600Ω application: R1 = 390K ZB1 = 100K ZB2 = 0R ZB3 = NF ZT = 300R ZC = 47k C1, C2 = 100nF C3 = NF Silver TEL EC OM GND GND Figure 3: Line Impedance and Network Balance Components © Silver Telecom 2006 5 Ag2130 V1.4 September 2006 Data Sheet LOW COST PSTN INTERFACE requires a 130V AC varistor (which clamps at 300V which is the maximum rating of the loop switch transistor). A 14mm device should be used to withstand the two 100A 10/560us surges. Ag2130 can receive signals when on-hook, presenting a high impedance to the line. I.e. whilst drawing a very small current (5µA approx) from the line. 3.5 Ringer Load Networks Examples of suitable devices are:Joyin JVR-14N201K; Walsin VZ14D201KBS The “dummy ringer” is usually a capacitive/resistive load which is connected across TIP/RING. During a call it is of sufficiently high impedance not to affect the operation of the interface. The Ag2130 meets the dummy ringer requirements for CTR21 (Europe), USA and Asia. 4.0 Note: If varistors to ground are used for added protection (e.g. more than 1500V) customers should be aware that the FCC test generator for longitudinal tests is rated at up to 1000A. 10Ω, 2W wire wound surge limiting resistors will also be needed. Device Protection. 4.2 Like many of the performance requirements which the Ag2130 must meet, protection for the interface is dependent upon regulatory standards in the market in which the equipment is deployed. Some examples are given below, but these are not exhaustive. To meet the EN/UL60950 mains cross test 22Ω, 2W wire wound surge resistors and 0.35A special fuses (Bussman C515 or Littelfuse 220003) in a balanced configuration are required. Alternatively a Teccor F1250T fuse may be used without surge limiting resistors. For a more comprehensive overview of protection for line interfaces, refer to our Over-voltage Protection Applications Note. This is may be downloaded from the Silver Telecom web-site (www.silvertel.com) or will be provided by our local representative. 4.1 EN/UL60950 Protection. It is also possible to use PTC thermistors to meet these tests. The Raychem TR600-150 is designed for this application. See Raychem Application Notes for further details. A typical application is shown in figure 6a. FCC Pt 68 Requirements. 4.3 To withstand the FCC Pt68 longitudinal voltage surge of 1500V no protection is required, as the barrier will withstand 1500V peak voltage to GND. Other Standards. The Ag2130 has provision for low cost mains cross protection (CCITT K21): a 47Ω, 2W wire wound surge resistor and a PTC thermistor are sufficient to meet regulatory approvals. A suitable device is the Walsin To withstand the FCC Pt68 metallic surges at 800V ZT ZC ZT1 DMa R1 ZT2 Ag2130 DMb VoicePump DSP shown for illustration purposes. Ag2130 can interface to any codec ZB V IN ZB1 C1 V OUT LIN C2 RS LSC Silver TIP PTC X1 RING V REF TR + For 600R line and balance impedance: C6 V CC GND C4 Protection circuit depends upon precise application VoicePump VP140 AGPIO DSP + GND C5 Typical protection: V CC Figure 4: Typical Application © Silver Telecom 2006 Processor Interface V TR REF T OO M T EELLEEC C Protection Circuit LOUT 6 R1 = 390k ZB1 = 100k ZT = 300 Ω ZC = 47K C1, C2, C4 = 100nF C5 = 10uF , C6 = 100uF PTC = TR600 - 150 (Raychem) X1 = TVB200SA (Raychem) Ag2130 V1.4 September 2006 Data Sheet LOW COST PSTN INTERFACE F Ag2130 Ag2130 PTC Central Office Line PTC TIP TIP Central Office Line X1 RING 47R, 2W RING TPP25011 GATE GATE hook ANODE ANODE CA THODE CATHODE Fig 5a: Standard Protection Fig 5b: Off-hook Protection Figure 5: Protection Options In order to maintain this approval when the Ag2130 is incorporated into a host system care must be taken to maintain the user protection provided in the Ag2130 by ensuring adequate separation of the line side circuitry and components from the protected circuit so that the barrier is not compromised. The system should be housed in a fire enclosure made of a suitable flame retardant material. PTD3A350H26. (Metallic protection with a single device is all that is required, as the Ag2130 will withstand longitudinal voltages up to 1000Vrms to ground without additional protection). As an option, for improved off-hook power cross protection, the Ag2130 has been designed to interface directly to the STM TPP25011. This protection arrangement is shown in figure 6b. 5.0 For USA and Canada the line cord connecting the system to the network must have minimum 26AWG conductors. Regulatory Standards There are some aspects of international standards that are not fully met by the Ag2130. These are shown below. It is Silver Telecom’s policy to bring to the attention of customers all known exceptions. User/Network safety from mains power voltage (EN60950 paragraphs 2.1.1 and 6.1) must be provided externally by a power supply with reinforced or double insulation. The Ag2130 meets the requirements of EN60950-1: 2001 paragraph 6.1.2.1 for all countries except Norway, Sweden and Finland. Please contact Silver Telecom if the product is needed for these countries. 6.0 Layout The Ag2130 has been approved to the following safety standards: EN 60950-1:2001 IEC60950-1: First Edition 2001 AS/NZ60950-1: 2003 UL60950-1: 2003 1st Edition CSA 22.2 No.60950-1-03 1st Edition © Silver Telecom 2006 Signal tracks should be kept as short as possible. Special attention should be paid to DMa, DMb and ZB as these are sensitive nodes. 7 Ag2130 V1.4 September 2006 Data Sheet 7.0 LOW COST PSTN INTERFACE Absolute Maximum Ratings* All Voltages are with respect to ground unless otherwise stated. Parameter Sym Min Max Units 1 DC supply voltage VCC -0.3 6.0 V 2 DC battery voltage present between Tip and Ring (on-hook) VTR 300 V 6.0 V 3 Maximum voltage on programmable pin, LSC -0.3 4 Maximum power dissipation @ 25°C PTRUNK 0.75 W 5 Maximum loop current (continuous) ILOOP 90 mA 6 Maximum ringing current (for 0.5 second) IRING 185 mARMS 7 Storage Temperature TS -40 +100 O 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. 8.0 Recommended Operating Conditions* All Voltages are with respect to ground unless otherwise stated. Parameter Symbol Min Typ Max Units 1 DC supply voltage (+5V operation) VCC 4.75 5.0 5.25 V 2 DC supply voltage (+3.3V operation) VCC 3.13 3.3 3.47 V 3 DC battery voltage on Tip and Ring (on-hook) VTIP VRING 0 0 0 -48 -120 -120 V V 4 DC loop current ILOOP 0 25 85 mA 5 Operating Temperature TOP 0 25 70 O *Typical figures are at 25°C with nominal +5V or +3.3V supplies and are for design use only. © Silver Telecom 2006 8 C Ag2130 V1.4 September 2006 Data Sheet LOW COST PSTN INTERFACE 9.0 DC Electrical Characteristics. Characteristic Sym Min 1 Supply current, on-hook3 2 Loop current range 3 Status output, RS Output low voltage Output high voltage VOL VOH Status output, RS Output low voltage Output high voltage VOL VOH 2.8 Control input, LSC Input low voltage Input high voltage VIL VIH 2.5 6 Control input, LSC Input low current Input high current 7 ICC Typ2 Max 2.5 ILOOP 14.0 Units Test Comments1 4.0 mA 85.0 mA +5V operation @ 50µA @ -50µA +3.3V operation @ 50µA @ -50µA 0.4 V V 0.4 V V 0.5 V V +5V operation IIL IIH 200 450 µA µA +5V operation Control input, LSC Input low voltage Input high voltage VIL VIH 0.5 V V +3.3V operation 8 Control input, LSC Input low current Input high current IIL IIH 100 300 µA µA +3.3V operation 9 Off-hook DC voltage 10 Leakage current, Tip and Ring to analog ground ILA 35 µA 100VDC 11 Leakage current on-hook, Tip to Ring ILTR 35 µA 100VDC 4 5 4.5 2.5 5.7 V ILOOP = 20mA DMa-DMb = 390K All DC Electrical Characteristics are over the Recommended Operating Conditions with VCC at +5.0V +5%, unless otherwise stated. 1 For test circuit details please contact Silver Telecom 2 Typical figures are at 25°C with nominal supply and 25mA loop current, unless otherwise stated. These figures are for design aid only. 3 Operating currents are dependent on the users application. © Silver Telecom 2006 9 Ag2130 V1.4 September 2006 Data Sheet LOW COST PSTN INTERFACE 10.0 AC Electrical Characteristics. Characteristic Sym 1 Ringing voltage: detect Ringing voltage: no detect VRD 2 Ringing voltage: detect Ringing voltage: no detect VRD 3 4 5 6 7 Input Impedance at VIN Output impedance at Vout Voltage gain, 2 Wire to VOUT Voltage gain, VIN to 2 Wire On-hook gain, 2 Wire to VOUT 8 Relative gain, referenced to 1kHz. 2Wire - Vout, Vin - 2Wire 9 Total harmonic distortion @ 2Wire and Vout THD 10 Overload distortion @2 Wire and Vout @+3dBm, 1 kHz OD 11 12 Common mode rejection ratio off-hook Common mode overload level off-hook 13 Idle channel noise off-hook 14 CMRR on-hook 15 CMOL on-hook 16 Idle Noise on-hook 17 Power supply rejection ratio At 2 Wire and Vout 18 Return loss, 600R 19 Transhybrid loss, 600R 20 Metallic to longitudinal balance 21 Leakage current, Tip or Ring to analog ground Min Typ* 30 26 26 26 22 22 Max 22 18 0 -0.5 -6.3 Test Comments1 VRMS +5V supply 17 to 68Hz VRMS +3.3V supply 17 to 68Hz kΩ 100 -0.5 -1.0 -6.8 Units 10 +0.5 0 -5.8 Ω dB Off-hook, 1KHz Off-hook, 1KHz On-hook, 1kHz +0.5 dB 300 - 3400 Hz 0.1 1.0 % @0dBm, 1kHz 0.5 5.0 % +5V supply +3.3V supply 50 – 500Hz VCM = 60VRMS -0.5 dB dB CMRR 70 80 dB CMOL 250 300 VRMS 0 NC 40 12 55 300 140 dB VRMS 23 PSRR 25 RL 18 THL 18 21 60 40 dBrnC 35 35 70 70 5 ILA dBrnC 50 – 60Hz @2 Wire & VOUT 50-500Hz +5V supply +3.3V supply @VOUT dB Ripple 0.1V, 1kHz on VCC dB 300-3400Hz dB dB dB dB 300-3400Hz 500-2500Hz 200-1000Hz 1000-4000Hz mARMS 1000V ac All AC Electrical Characteristics are over the Recommended Operating Conditions with VCC at +5.0V +5%, unless otherwise stated. *Typical figures are at 25°C with nominal 5V supply and 25mA loop current unless otherwise stated. These figures are for design aid only. © Silver Telecom 2006 10 Ag2130 V1.4 September 2006 Data Sheet LOW COST PSTN INTERFACE Mechanical Specification and Pin Assignation 11.1 Ag2130S – SIL Package 11.0mm 61mm Ag2130S 1.27mm 12.0mm 1 8.3mm 0.6 ± 0.05 3.0 2.54 ± 0.25 0.6 ± 0.05 Ring (B) Tip (A) Cathode Anode Gate DMb DMa Ag2130S pin 1 12.7 ± 0.25 NC VIN VOUT LSC GND VCC NC ZB ZT2 ZT1 RS VREF VTR Silver Telecom recommends the use of 2.54mm sockets, especially on prototype and pre-production boards. Recommended PCB hole diameter = 1.1 + 0.05mm © Silver Telecom 2006 11 1.27mm