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V1.7 July 2010 Datasheet Ag2130 Low Cost PSTN Interface © Silver Telecom 2010 1 Silvertel
- Approved to: EN 60950-1:2001 IEC60950-1: First Edition 2001 AS/NZ60950-1: 2003 UL60950-1: 2003 1 st Edition CSA 22.2 No.60950-1-03 1st Edition
FEATURES
- 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, line detection and parallel phone detect.
- On-hook reception.
- Meets requirements of FCC Pt68. Low cost power cross protection.
- Programmable d.c. ma sk, line and network impedances, allows use in any market.
- Silvertel “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 feat ures listed, the Ag2130 allows flexible programming of many functions, including the dc voltage mask and impedances. The Ag2130 meets international safety and regulatory requirements. 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. PbPb
V1.7 July 2010 Data Sheet © Silver Telecom 2010 3 Ag2130 LOW COST PSTN INTERFACE
1.0 Pin Description
1.1 SIL Pin-Out
Pin # Name Description 1 RING (B) Ring. Connects to the subscriber line Ring. 2 TIP (A) Tip. Connects to the subscriber line Tip. 3 CATHODE Cathode. For power cross protection connect to protection device cathode. 4 ANODE Anode. For power cross protection connect to protection device anode. 5 GATE Gate. For power cross protection connect to protection device 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 Z T2. 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.
V1.7 July 2010 Data Sheet © Silver Telecom 2010 4 Ag2130 LOW COST PSTN INTERFACE
2.0 Line Interfacing
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. Any equipment terminating a telephone line must present the correct d.c. resi stance 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 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. 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 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. In order to implement ground start applications please contact Silvertel 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 us es 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 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. 2.2.2 Ringing Detection and Sensitivity. 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 sensitivity to ringing is set internally to 22V RMS when VCC is +5V. 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 V OUT and from a ground referenced signal at VIN. V OUT and V IN are normally connected to a codec (via d.c. blocking capacitors) for conversion to and from a Pulse Code Modulated (PCM) stream. 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.
V1.7 July 2010 Data Sheet © Silver Telecom 2010 5 Ag2130 LOW COST PSTN INTERFACE
3.2 The 2 Wire Impedance
The input impedance, Z IN, of the Ag2130 can be programmed. This is achieved by connecting an impedance matching network between Z T1 and Z T2. This network is the line impedance to be matched minus 300. For example to match 600, fit a 300 resistor. Other common line impedances, and the corresponding programming components are listed in Table 2. In addition to the programming network, an impedance, Z C must be fitted between ZT2 and Zb to provide gain and frequency compensation. An alternative method of programming the 2 wire impedance is to choose a codec where the internal filter characteristics ca n be programmed to provide the correct matching. In order to generate the filter coefficients a model of the Ag2130 must be used. This file, in .CIR format is available on request from Silvertel or one of our representatives. 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.
3.4 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 Table 2: Line and Network Balance Impedance Examples eg. 2-wire Impedance ZT Z C Network Balance Impedance Zb1 Z b2 Z b3 C3 Notes 1 600 300 47K 600 100K 0R --- --- USA Short Line, Far East, Middle East
2 CTR21 750R//
680pF 5.1K --- --- Europe 3 900 620 62K 900 220K 0R --- --- USA Long Line, Brazil 4 600 300 47K 100R +1K//100nF 39K 39K 0R 1.5nF Japan For 600 application: R1 = 390K ZB1 = 100K ZB2 = 0R ZB3 = NF ZT = 300R ZC = 47k C1, C2 = 100nF C3 = NF Figure 3: Line Impedance and Network Balance Components VCC ZB1 Ag2130 VIN VOUT DMa VCC Zb DMb GND GND Silver T E L E C O M ZB2 GND ZB3 ZT ZC ZT1 ZT2 VCC ZB1 Ag2130 VIN VOUT DMa VCC Zb DMb GND GND Silver T E L E C O M ZB2 GND ZB3 ZT ZC ZT1 ZT2
V1.7 July 2010 Data Sheet © Silver Telecom 2010 6 Ag2130 LOW COST PSTN INTERFACE Ag2130 can receive signals when on-hook, presenting a high impedance to the line. I.e. whilst drawing a very small current (5A approx) from the line.
3.5 Ringer Load Networks
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 Device Protection. 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. 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 Silvertel web-site (www.s ilvertel.com) or will be provided by our local representative. 4.1 FCC Pt 68 Requirements. To withstand the FCC Pt68 longitudinal voltage surge of 1500V no protection is required, as the barrier will withstand 1500V peak voltage to GND. To withstand the FCC Pt68 metallic surges at 800V 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. Examples of suitable devices are:- Joyin JVR-14N201K; Walsin VZ14D201KBS 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. 10 2W wire wound surge limiting resistors will also be needed. 4.2 EN/UL60950 Protection. To meet the EN/UL60950 mains cross test 22 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. 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. 4.3 Other Standards. The Ag2130 has provision for low cost mains cross protection (CCITT K21): a 47 2W wire wound surge resistor and a PTC thermistor are sufficient to meet regulatory approvals. A suitable device is the Walsin Figure 4: Typical Application VIN VOU T RS LS C ZB DM a DMb TI P RI NG GND LO UT LI N Processor Interface Protection Circuit V CC Pr otecti on circuit depends upon prec ise applicat ion V CC T E L E C O Silver ZB1 C1 PTC X1 Ag2130 AGP IO VoicePump VP140 DSP For 600R line and balance impedance: R1 = 390k Z B1 = 100k Z T = 300 Z C = 47K C1, C2, C4 = 100nF C5 = 10uF Typical pr otecti on: PT C = TR6 00 - 150 (Raychem) X1 = TVB200SA (Raychem) PTC ZC Z T Z T1 Z T2 VoicePump DSP shown for illustration purposes. Ag2130 can i nterface to any codec VREF VTR VIN VOU T RS LS C ZB DM a DMb TI P RI NG GND LO UT LI N Processor Interface Protection Circuit V CC Pr otecti on circuit depends upon prec ise applicat ion V CC T E L E C O M Silver ZB1 C1 PTC X1 Ag2130 AGP IO VoicePump VP140 DSP For 600R line and balance impedance: , C6 = 100uF Typical pr otecti on: PT C = TR6 00 - 150 (Raychem) X1 = TVB200SA (Raychem) PTC ZC Z T Z T1 Z T2 VoicePump DSP shown for illustration purposes. Ag2130can i nterface to any codec VTR VREF GND
V1.7 July 2010 Data Sheet © Silver Telecom 2010 7 Ag2130 LOW COST PSTN INTERFACE 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 Regulatory Standards
There are some aspects of international standards that are not fully met by the Ag2130. These are shown below. It is Silvertel’s policy to bring to the attention of customers all known exceptions. The Ag2130 meets the requirements of EN60950-1: 2001 paragraph 6.1.2.1 for all countries except Norway, Sweden and Finland. Please contact Silvertel if the product is needed for these countries. 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 1 st Edition CSA 22.2 No.60950-1-03 1st Edition 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. For USA and Canada the line cord connecting the system to the network must have minimum 26AWG conductors. 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.
6.0 Layout
Signal tracks should be kept as short as possible. Special attention should be paid to DMa, DMb and ZB as these are sensitive nodes. Fig 5a: Standard Protection Figure 5: Protection Options Fig 5b: Off-hook Protection Ag2130 RING TIP GATE ANODE CATHODE Central Office Line TPP25011 hook PTC 47R, 2W Ag2130 RING TIP GATE ANODE CATHODE Central Office Line TPP25011 hook PTC 47R, 2W Central Office Line Ag2130 RING TIP GATE ANODE CA THODE PTC X1Central Office Line Ag2130 RING TIP GATE ANODE CA THODE PTC
V1.7 July 2010 Data Sheet © Silver Telecom 2010 8 Ag2130 LOW COST PSTN INTERFACE
7.0 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) V TR 300 V
3 Maximum voltage on programmable pin, LSC -0.3 6.0 V 4 Maximum power dissipation @ 25C 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 OC
*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) V CC 4.75 5.0 5.25 V 2 DC supply voltage (+3.3V operation) V CC 3.13 3.3 3.47 V
3 DC battery voltage on Tip and Ring
(on-hook) VTIP VRING -48 -120 -120 V V
4 DC loop current ILOOP 0 25 85 mA
5 Operating Temperature TOP 0 25 70 OC
*Typical figures are at 25°C with nominal +5V or +3.3V supplies and are for design use only.
V1.7 July 2010 Data Sheet © Silver Telecom 2010 9 Ag2130 LOW COST PSTN INTERFACE 9.0 DC Electrical Characteristics. Characteristic Sym Min Typ 2 Max Units Test Comments 1 1 Supply current, on-hook 3 I CC 2.5 4.0 mA 2 Loop current range ILOOP 14.0 85.0 mA Status output, RS Output low voltage Output high voltage V OL VOH 4.5 0.4 V V +5V operation @ 50A @ -50A Status output, RS Output low voltage Output high voltage V OL VOH 2.8 0.4 V V +3.3V operation @ 50A @ -50A Control input, LSC Input low voltage Input high voltage V IL VIH 2.5 0.5 V V +5V operation Control input, LSC Input low current Input high current I IL IIH 200 450 +5V operation Control input, LSC Input low voltage Input high voltage V IL VIH 2.5 0.5 V V +3.3V operation Control input, LSC Input low current Input high current I IL IIH 100 300 +3.3V operation 9 Off-hook DC voltage 5.7 V ILOOP = 20mA DMa-DMb = 390K
10 Leakage current, Tip and Ring to
LA 35 A 100VDC
11 Leakage current on-hook, Tip to
LTR 35 A 100VDC 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 Silvertel
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.
V1.7 July 2010 Data Sheet © Silver Telecom 2010 10 Ag2130 LOW COST PSTN INTERFACE 10.0 AC Electrical Characteristics. Characteristic Sym Min Typ* Max Units Test Comments1
1 Ringing voltage: detect
Ringing voltage: no detect VRD 30 VRMS +5V supply 17 to 68Hz
2 Ringing voltage: detect
Ringing voltage: no detect VRD 26 VRMS +3.3V supply 17 to 68Hz
3 Input Impedance at V IN 100 k
4 Output impedance at V out 10
5 Voltage gain, 2 Wire to V OUT -0.5 0 +0.5 dB Off-hook, 1KHz 6 Voltage gain, V IN to 2 Wire -1.0 -0.5 0 dB Off-hook, 1KHz 7 On-hook gain, 2 Wire to V OUT -6.8 -6.3 -5.8 dB On-hook, 1kHz
8 Relative gain, referenced to
1kHz. 2Wire - V out, Vin - 2Wire -0.5 +0.5 dB 300 - 3400 Hz
9 Total harmonic distortion @
out THD 0.1 1.0 % @0dBm, 1kHz
10 Overload distortion @2 Wire and
V out @+3dBm, 1 kHz OD 0.5 5.0 % +5V supply +3.3V supply
11 Common mode rejection ratio
CMRR 70 80 dB 50 – 500Hz V CM = 60VRMS
12 Common mode overload level
CMOL 250 300 VRMS 50 – 60Hz
13 Idle channel noise off-hook NC 0 12 dBrnC @2 Wire &
V OUT
14 CMRR on-hook 40 55 dB 50-500Hz
15 CMOL on-hook 300
+3.3V supply
16 Idle Noise on-hook 23 dBrnC @VOUT
17 Power supply rejection ratio
out PSRR 25 dB Ripple 0.1V, 1kHz on V CC
18 Return loss, 600R RL 18 35 dB 300-3400Hz
19 Transhybrid loss, 600R THL 18
20 Metallic to longitudinal balance 60
21 Leakage current, Tip or Ring to
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.
V1.7 July 2010 Data Sheet © Silver Telecom 2010 11 Ag2130 LOW COST PSTN INTERFACE Mechanical Specification and Pin Assignation
11.1 Ag2130S – SIL Package
Information published in this datasheet is believed to be correct and accurate. Silver Telecom assumes no liability for errors which may occur or for liability otherwise arising out of use of this information or infringement of patents which may occur as a result of such use. No license is granted by this document under patents owned by Silver Telecom or licensed from third parties by Silver Telecom. The products, their specification and information appearing in this document are subject to change by Silver Telecom without notice. Silver Telecom recommends the use of 2.54mm sockets, especially on prototype and pre-production boards. Recommended PCB hole diameter = 1.1 + 0.05mm Ag2130SAg2130S pin 1 Ring (B) Tip (A) Cathode Anode Gate DMb DMa NC V IN VOUT LSC GND V CC NC Z B ZT2 ZT1 RS VTR VREF Ag2130SAg2130SAg2130SAg2130S pin 1 Ring (B) Tip (A) Cathode Anode Gate DMb DMa NC V IN VOUT LSC GND V CC NC Z B ZT2 ZT1 RS VTR VREF 12.0mm ±0 . 5 m m 61mm ±0 . 5 m m 3.0 Ag2130SAg2130S 1.6mm 0.6 ± 0.05 11.0mm 8.3mm 12.0mm ±0 . 5 m m 61mm ±0 . 5 m m 3.0 Ag2130SAg2130SAg2130SAg2130S 1.6mm 0.6 ± 0.05 11.0mm 8.3mm