RT03106

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Description

RT03106 is A highly featured Programmable impedances PSTN Interface (COIC, FXO, DAA, Trunk Interface) , Transformer isolation providing high common-mode rejection (CMRR) for use inun-grounded systems. use of anti-bell impingement circuit , you can make the system safe and reliable docking with various types of PBX.

RT03106 loop trunk interface circuit using a high impedance signal path, in the on-hook state, the circuit will automatically switch to the channel, to achieve the transmission of the audio signal in the on-hook state. The channel has minimal distortion, reliable detection of DTMF signals can hook state and FSK signal.

 

Features:

  • Transformer isolation providing highcommon-mode rejection (CMRR) for use inun-grounded systems.
  • Highly integrated with on-board loop switchand diode bridge.
  • Loop start circuit, ringing detect and loopcurrent detection.
  • +5V or +3.3V supply.
  • Tip-ring polarity detect (for Caller Line IDand remote metering) and
  • on-hook reception FSK DTMF for Caller Line I.D. or for telemetry purposes.
  • High performance with low price
  • Constant current load

.Programmable d.c. mask, line and network impedances, allows use in any market.

 

Applications:

  • PABX,
  • Internet Telephony (VoIP) applications.
  • GSM gateway
  • Call center, voice card

 

  • Recommended Operating Conditions

 

Parameter

Symbol

Min

Typ

Max

Units

1

DC supply voltage (+5V operation)

VCC

4.75

5

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

VTIP

0

0

-120

V

4

(on-hook)

VRING

0

-48

-120

V

5

DC loop current

ILOOP

0

25

85

mA

6

Operating Temperature

TOP

0

25

70

  • DC Electrical Characteristics

 

Characteristic

Sym

Min

TYP

Max

Units

Test Comments

1

Supply current, on-hook

ICC

 

2.5

4

mA

 

2

Loop current range

ILOOP

14

 

85

mA

 

3

Status output, RS

Output low voltage

Output high voltage

VOL  

VOH

4.5

 

0.4

 

 +5V operation

 @50uA

 @-50uA

4

Status output, RS

Output low voltage

Output high voltage

VOL

VOH

2.8

 

0.4

V

V

 +3.3V operation

 @50uA

 @-50uA

5

Control input, LSC

Input low voltage

Input high voltage

VIL

VIH

2.5

 

0.5

V

V

+5V operation

6

Control input, LSC

Input low current

Input high current

IIL

IIH

 

 

200

450

uA

uA

+5V operation

7

Control input, LSC

Input low voltage

 Input high voltage

VIL

VIH

2.5

 

0.5

V

V

+3.3V operation

8

Control input, LSC

Input low current

Input high current

IIL

IIH

 

 

100

300

uA

uA

+3.3V operation

9

Off-hook DC voltage

 

 

5.7

 

V

ILOOP = 20mA

DMa-DMb = 390K

10

Leakage current, Tip and Ring to analog ground

ILA

 

 

35

uA

100Vdc

11

Leakage current on-hook, Tip to Ring

ILTR

 

 

35

uA

100Vdc

All DC Electrical Characteristics are over the Recommended Operating Conditions with VCC at +5.0V +5%, unless otherwise stated.

 

  • AC Electrical Characteristics

 

Characteristic

Sym

Min

Typ*

Max

Units

Test Comments1

1

Ringing voltage: detect

 

30

26

22

 

+5V supply

Ringing voltage: no detect

VRD

30

26

22

VRMS

17 to 68Hz

2

Ringing voltage: detect

 

26

22

18

 

+3.3V supply

Ringing voltage: no detect

VRD

26

22

18

VRMS

17 to 68Hz

3

Input Impedance at VIN

 

 

100

 

kW

 

4

Output impedance at Vout

 

 

 

10

W

 

5

Voltage gain, 2 Wire to VOUT

 

-0.5

0

0.5

dB

Off-hook, 1KHz

6

Voltage gain, VIN to 2 Wire

 

-1

-0.5

0

dB

Off-hook, 1KHz

7

On-hook gain, 2 Wire to VOUT

 

-6.8

-6.3

-5.8

dB

Off-hook, 1KHz

8

Relative gain, referenced to

1kHz. 2Wire - Vout, Vin - 2Wire

 

-0.5

 

0.5

dB

300 - 3400 Hz

9

Total harmonic distortion @ 2Wire and Vout

THD

 

0.1

1

%

@0dBm, 1kHz

10

Overload distortion @2 Wire and Vout @+3dBm, 1 kHz

OD

 

0.5

5

%

 +5V supply

 +3.3V supply

11

Common mode rejection ratio off-hook

CMRR

70

80

 

dB

50 - 500Hz

VCM = 60VRMS

12

Common mode overload level off-hook

CMOL

250

300

 

VRMS

50 - 60Hz

13

Idle channel noise off-hook

NC

 

0

12

dBrnC

 @2 Wire & Vout

14

CMRR on-hook

 

40

55

 

dB

50-500Hz

15

CMOL on-hook

 

 

300

 

VRMS

 +5V supply

 +3.3V supply

16

Idle Noise on-hook

 

 

23

 

dBrnC

@VOUT

17

Power supply rejection ratio At 2 Wire and Vout

PSRR

25

 

 

dB

Ripple 0.1V, 1kHz on VCC

18

Return loss, 600R

RL

18

35

 

dB

300-3400Hz

19

Transhybrid loss, 600R

THL

18

21

35

 

dB

300-3400Hz

500-2500Hz

20

Metallic to longitudinal balance

ILA

60

40

70

70

 

dB

200-1000Hz

1000-4000Hz

21

Leakage current, Tip or Ring to analog ground

 

 

 

5

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.

 

 

  • 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

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

LC

Loop current. A logic 1 Indicates that loop current is flowing.

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

F/R

Forward/reverse. A logic 1 indicates that the Tip and Ring polarities are reversed. i.e. Tip is negative with respect to Ring. NOTE: When no line voltage is present the logic state is indeterminate.

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.

 

  • D.C. Termination.

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 RT03106 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.

 

  • 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 RT03106 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 22VRMS when VCC is +5V, or 14VRMS when VCC is +3.3V

 

  • Reversal Detect

The reversal of the battery polarity is used as a signalling technique. The RT03106 can detect this condition and provides a continuous output on the F/R pin, whether in the on-hook or off-hook state.One example of this type of signalling is in Caller Line ID in the United Kingdom, where a battery polarity reversal precedes the transmission of data before the ringing signal is applied to the line. Another example is in some systems in the US where a reversal is used to indicate far end answer

 

  • The 2-4 Wire (Hybrid) Conversion.

The RT03106 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.

 

  • 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

 

  • The 2 Wire Impedance

The input impedance, ZIN, of the RT03106 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 Table1, In addition to the programming network, an impedance,ZC 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 can be programmed to provide the correct matching. In order to generate the filter coefficients a model of the RT03106 must be used.

 

  • 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.

 

  • 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 RT03106 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.

  • Typical Connection Diagram:

 

 

Table 1

Line and Network Balance Impedance program

 

2-wire

Impedance

ZT

ZC

Balance

Impedance

Zb1

Zb2

Zb3

C3

Notes

1

600 Ω

300 R 

47K

600 Ω  

100K

0R

nc

nc

USA Short Line, Far East, Middle East

2

CTR21

750R// 220nF

68K// 680pF

CTR21

220K// 680pF

5.1K

nc

nc

Europe

3

900 Ω

620 R 

62K

900 Ω  

220K

0R

nc

nc

USA Long Line, Brazil

4

600 Ω  

300 R 

47K

100R

+1K//100nF

39K

39K

0R

1.5nF

Japan

 

  • PackageSize: (mm   ±0.3mm )

 

  • PCB Decal : (mm   ±0.3mm )