AG1110 SILVERTEL

Document overview

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Technical content

V2.7 August 2009 Datasheet Ag1110 LOW COST SLIC © Silver Telecom 2009 Silvertel Figure 1: Single Channel SLIC

FEATURES

  • Single-in-line (SIL) PBX SLIC with integral lead frame.
  • Highly integrated, requiring a minimum of external components.
  • Constant current feed to the line, with constant voltage fold over.
  • Single +5V system side power supply.
  • 16mA minimum loop current into 2000R loop (including telephone set).
  • 600R and 900R impedance options.
  • Works with a battery of up to –72V.
  • Low idle power operation (20mW).
  • Short circuit protection.
  • Loop open function - loop off under logic control.
  • On hook transmission.

DESCRIPTION

The Silver Telecom Ag1110 comprises a single Subscriber Line Interface Circuit (SLIC) in a single-in-line (SIL) 13 pin format. The combination of features and packaging offers extremely efficient use of board area, saving significant system size and cost. The SLIC is highly featured requiring a minimum of external components. Functions such as a relay driver, are provided on board along with precision loop feed resistors. The Ag1110 has been designed to work in private systems where cost is a major concern and advanced public network signalling is not a requirement. The system interface has been designed for direct connection to popular codecs for both audio and signalling. The Ag1110 is ideal for any application where high-density line interfacing is required, such as Computer Telephony Integration (CTI), Small Office Home Office (SOHO) and PABX. Control and Supervision PBX SLIC TIP VIN RING VOUT

V2.7 August 2009 Ag1110 Data Sheet © Silver Telecom 2009 Page 2 LOW COST PBX SLIC

V2.7 August 2009 Data Sheet © Silver Telecom 2009 Page 4 Ag1110 LOW COST PBX SLIC Pin Description Pin # Name Description 1 RING Ring. Connects to the subscriber line Ring through the n/c pole of the ringing relay. 2 TIP Tip. Connects to the subscriber Tip. 3 TC Tip Clamp. A diode must be connected externally between TC and Tip to conduct ringing current. 4 RT Ring Trip. A capacitor is connected externally between RT and GND to filter out the AC component of the ringing signal. Must be switched out during LD dialling. 5 GND Analog Ground. Normally connected to system ground. 6 V IN Audio In. This is the analog input signal from the codec (which is output on Tip and Ring). 7 V CC +5V Positive Supply. This pin must be connected to +5V. 8 V OUT Audio Out. This is the analog output signal (from Tip and Ring) to the codec. 9 V BAT Battery Voltage. The negative supply rail. Typically -48V. 10 SHK Switch Hook Current. Indicates loop current is flowing (such as when off hook) when at logic 1. 11 LO Loop Off. A logic 1 removes loop current, used during fault conditions. 12 RDI Relay Driver Input. A logic 1 activates RDO. 13 RDO Relay Driver Output. Open collector relay driver, connects to the coil of the ringing relay. Figure 4: Pin Connections RING TIP TC RT GND V IN VCC VOUT VBAT SHK LO RDI RDO

V2.7 August 2009 Data Sheet Ag1110 LOW COST PBX SLIC

1.0 Line Interfacing

As well as being in an electrically demanding environment, the needs of di fferent applications and regulatory standards means that the SLIC must allow flexibility, together with fa cilities to ensure robust performance. The Ag1110 SLIC provides a complete and flexible interface to the telephone line.

1.1 Battery Feed

The battery feed to the telephone line used by the Ag1110 can vary between -42V and -72V. For public network applications -48V is the most common. A constant current is fed to t he line, which is preset to 25mA. If the loop length is such that the constant current feed cannot be maintained, then the Ag1110 will revert to a constant voltage source, allowing the loop to be serviced at a reduced loop current. Typically with a 2000R loop, and -48V battery voltage, loop current is 18.5mA. The power dissipated in the Ag1110 SLIC is internally limited to a safe value.

1.3 Ringing

The ringing signal is provided by an external ringing generator and is switched onto the line by the user provided ringing relay. The coil of the ringing relay should be connected to a positive supply voltage (normally +5V) and the open collector driver RDO. The relay is activated by applying a logic high to RDI. Note: a flyback diode must be connected across the coil. Unbalanced ringing is supported on the Ag1110 via the use of a single external relay (with single pole changeover). An application drawing is shown in Fig 5. When the “off-hook” condition occurs during ringing (as indicated when SHK produces a logic level 1), a logic level 0 should be applied to RDI. This will deactivate the relay, and remove the ringing signal from the line. The SLIC will then assume it’s constant current feed condition. 2.0 The 2-4 Wire (hybrid) Conversion. This is also referred to as the hybrid function. The Ag1110 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 input at VIN. VOUT and V IN are normally connected to a Codec for conversion to and from a digital Pulse Code Modulated (PCM) stream. 2.1 Transmit and Receive Gain. The gain in both the transmit direction (TIP/RING to V OUT) and the receive direction (V IN to TIP/RING) is set to -1dB. Normally any gain adjustments required by the user can be made by using the Codec. 2.2 The 2 Wire Impedance. The input impedance, Zin, of the Ag1110 SLIC is set to 600R. For countries where the line impedance is 600R e.g. North America and the Far East, no external adjustment is required. For countries where an alternative line impedance is used the Codec filter characteristics can be programmed to give the required matching. For countries where the impedance is 900R, the Ag1110-900 can be used where the SLIC impedance is internally fixed at 900R. The Codec manufacturer will provide information on how Codec programming is accomplished. Programmable Codecs require information about the transfer characteristics of the SLIC with which they are working, which is contained in a “.CIR” netlist. A “.CIR” netlist can be obtained by c ontacting either Silver Telecom or your local representative, to allow the Codec programming coefficients to be generated. If a simple Codec is being used, the Ag1110 can only accommodate countries where the line impedance is 600R (Ag1110), or 900R (Ag1110-900). 2.3 Network Balance Impedance. The network balance impedance, Zb, is set to 600R for the Ag1110. For countries where the network balance impedance is 600R e.g. North America and the Far East, no external adjustment is required. For 900R balance the Ag1110-900 can be used. For countries where an alternative network balance impedance is used the Codec filter characteristics can be programmed to give the required matching. The “.CIR” netlist is again needed to allow the Codec programming coefficients to be generated. If a simple Codec is being used the Ag1110 can only accommodate countries where the line impedance is 600R or 900R. 2.5 On Hook Transmission. The Ag1110 is capable of on-hook transmission with the addition of a 20k, 0.25W resistor from Tip to Ring. This means analog signals can be transmitted from V IN 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. With the tip-ring resistor fitted, idle current increases by 2.2mA. © Silver Telecom 2009 Page 5

V2.7 August 2009 Data Sheet Ag1110 LOW COST PBX SLIC To M CU TEXAS TCM38C17 C3 0GSX 0A NLGIN- 0PWRO+ 1GSX 1ANLGIN -1PWRO+ 2GSX 2ANLGIN -2PWRO+ 3GSX 3ANLGIN -3PWRO+ +5V -48V0V VIN VOUT VCC TIP RING TC D6 RING TIP -VBAT SHK LO 90Vrms RDI Ag1110 Silver T E L E C O M D1 K1 RDO VBAT -48V GND RT +0V To M CU TEXAS TCM38C17 C3 0GSX 0A NLGIN- 0PWRO+ 1GSX 1ANLGIN -1PWRO+ 2GSX 2ANLGIN -2PWRO+ 3GSX 3ANLGIN -3PWRO+ +5V -48V0V VIN VOUT VCC TIP RING TC D6 RING TIP -VBAT SHK LO 90Vrms RDI Ag1110 Silver T E L E C O M D1 K1 RDO VBAT -48V GND RT +0V Components R1 = 300R, 2W (only one needed per linecard) R2 = PTC eg. Walsin PTD3A220H14 (one needed per system) R3, R4 = 25R and 350mA fuse (eg. Bussman C515) R5 = 20k, 1/4W. Only fitted for on hook transmission C1, C2 = 100nF, 50V, ceramic C3, C4 = 100nF, 50V, ceramic C6 = 1uF electrolytic D1 = 1N4148 D2-D6 = 1N4003 K1 = Relay, 5V (or 6V), 1 form C, 120R Coil (e.g. Omron G2E 184P-H or HKE HRS1H) Figure 5: Ringing Application Diagram with Codec The Ag1110 will provide on hook transmission with a high impedance on Tip/Ring or where specific loads are demanded by Network Operators.

3.0 Loop Current Detect Level

When the subscriber goes “off-hook”, loop current will begin to flow. If this current is above the detection threshold (default 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, to avoid short pulses due to contact bounce, causing a false switch hook output triggering the incorrect system response. During loop disconne ct (pulse) dialling, SHK will pulse between logic 1 and logic 0 to indicate the digits being dialled. Again it is recommended that software de- bouncing is used to avoid false detection of digits.

4.0 Relay Driver

On the SLIC an open collector driver, RDO, is provided to drive the ringing relay. This is activated by connecting a logic 1 to RDI. The coil of the user provided ringing relay must be connected between RDO and a positive supply voltage (normally +5V), with a fly back diode being fitted across the coil. Normally the ringing generator is cadenced, and the ringing relay will only be activated during the off period, as this prolongs the life of the relay contacts.

5.0 Protection

In most ‘off-premise’ applications the 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 to provide primary and secondary protection circuits to prevent damage to the SLIC. The Ag1110 has been designed to be able to use low cost lightning and power cross protection components, and a typical circuit is shown in Figure 5. This circuit will meet UL1459 and 1950 requirements. The series element (R3 and R4) is 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 resist or. The lightning protection is provided by diodes connected to 0V, and the battery voltage. To prevent lightning surges propagating via V BAT, this should be clamped with a Tranzorb device (Motorola or Protek 1.5KE56A for -48V battery). © Silver Telecom 2009 Page 6

V2.7 August 2009 Data Sheet Ag1110 LOW COST PBX SLIC 7.0 Electrical Characteristics. Absolute Maximum Ratings* - All Voltages are with respect to ground unless otherwise stated. Parameter Symbol Min Max Units 1 DC Supply Voltage VCC -0.3 6 V 2 DC Battery Voltage VBAT 0.3 -75 V 3 Relay Driver Voltage VRDO -0.3 15 V

4 Relay Driver Current IDO 100 mA

5 Power Dissipation, Off Hook @

25°C PSLIC 1.35 W

6 Storage Temperature TS -20 +85 °C

  • Exceeding the above ratings may cause pe rmanent damage to the product. Functional operation under these conditions is not i mplied. Maximum ratings assume free air flow. Recommended Operating Conditions* - All Voltages are with respect to ground unless otherwise stated. Parameter Symbol Min Typ Max Units 1 DC Supply Voltage VCC 4.75 5.0 5.25 V

2 DC Battery Voltage VBAT -42 -48 -72 V

3 Relay Driver Voltage VRDO -0.3 5 15 V

4 Operating Temperature TOp 0 25 70 °C

  • Typical figures are at 25°C with nominal +5V supplies and are for design use only. © Silver Telecom 2009 Page 8

V2.7 August 2009 Data Sheet Ag1110 LOW COST PBX SLIC Characteristic Symbol Min Typ† Max Units Test Comments

1 Supply Currents, On-hook

1.75 0.25 2.50 mA Idle Idle 20k Tip-Ring

2 Power Consumption, On-

3 Constant current feed to

18.5 16.5 27 mA R LOOP ‡= 1100R RLOOP ‡=2000R RLOOP ‡=2300R Tip/Gnd or Ring/Gnd or Tip&Ring/Gnd over- current 30 mA VBAT= -48V SHK: Output Low Voltage Output High Voltage V OL VOH 3.15 0.9 V V @0.4mA @-0.4mA SHK: Output Low Voltage Output High Voltage V OL VOH 3.5 0.4 V V @50uA @-50uA RDI, LO: Input Low Voltage Input High Voltage V IL VOH 4.0 0.3. V V RDI, LO: Input Low Current Input High Current I IL IIH -0.5 +1.2 mA mA

9 Switch Hook Detect

10 Relay driver current sink

DO 50 75 mA VRDI = +5V * All DC Electrical Characteristics are with VCC at +5.0V +5% and VBAT at -48V, and at 25°C unless otherwise stated. Typical figures are for design aid only and are not guaranteed. RLOOP includes 300R for telephone set. 1Operating IBAT is dependent upon the users application. © Silver Telecom 2009 Page 9

V2.7 August 2009 Data Sheet Ag1110 LOW COST PBX SLIC Characteristic Symbol Min Typ† Max Units Test Comments

1 Ring Trip Detect Time, REN=5 200 300 ms 70VRMS Ringing

2 Ringer Load REN 5 No false ring trip

3 Input AC Impedance 2-Wire ZIN 600

4 SHK Detect Time 5.0 10 ms No Ringing, No C6

5 Input Impedance at VIN 100 kohm

6 Output Impedance at VOUT 10 ohm

7 Voltage Gain, Tip/Ring to VOUT -1.5 -1.0 -0.5 dB Off-Hook 8 Voltage Gain, VIN to Tip/Ring -1.5 -1.0 -0.5 dB Off-Hook 9 Relative Gain, Ref to 1kHz -0.5 -0.5 dB 300Hz to 3400Hz

10 Total Harmonic Distortion @ 2

Wire and VOUT THD 1.0 % @ 0dBm, 1kHz, Off hook

11 Overload Distortion @ 2 Wire

OUT OD 5.0 % @ +3dBm, 1kHz, Off hook

12 Overload level at 2 Wire 0 dBm

On hook, 1kHz, AC load = 600R, RDC Tip-Ring = 20k

13 Common Mode Rejection Ratio CMRR 40 50 dB 300-3400Hz @ 2 Wire

14 Idle Channel Noise NC 0 12 dBrnC @2 Wire and VOUT

15 Power Supply Rejection Ratio

@ 2 Wire and V OUT PSRR 26 dB Ripple 0.1V, 1kHz on V CC and VBAT

16 Return Loss RL 18 38 dB 200-3400Hz

18 Longitudinal to Metallic Balance LCL 40

† Typical figures are at 25°C with nominal 5V supply and are for design aid only. © Silver Telecom 2009 Page 10

V2.7 August 2009 Data Sheet © Silver Telecom 2009 Page 11 Ag1110 LOW COST PBX SLIC 8.0 Mechanical Specification. Notes: 1. Not to scale. 2. Dimensions in millimeters 3. All figures are typical (unless otherwise stated) 13.5Ag1110Ag1110 4.0 0.6 ± 0.05 5.0 13.5Ag1110Ag1110Ag1110Ag1110 Figure 7: Physical Dimensions 4.0 0.6 ± 0.05 5.0