KS0835F

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Due to update and improvement of ring&tone products and technologies, information in this document is subjected to change without notice.

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Features

  • Single supply voltagering slic: +3.3V to +5.0V
  • Integral high efficiency DC/DC converter.
  • Highly integrated withringing generator.
  • Tip/Ring polarity reversal.
  • 2 / 4 wire conversion
  • Constant current feed
  • High performance with low price
  • Excellent sound quality
  • On-Hook Transmission for caller line ID.
  • Designed for GSM network
  • Easy to use, with a minimum number of external components.

 

Applications

  • Fixed Cellular Terminals (FCT) applications.
  • POS MODEM applications
  • Internet Telephony (VoIP) applications.
  • Fixed Wireless Terminals (FWT) applications.
  • DVB Terminals applications.
  • Wireless local loop (WLL)applications.
  • GSM gateway

 

Index

  • unbalanced to ground60dB(300Hz-3400Hz)
  • Two-Wire Impedance600R
  • Four-wire return loss>24Db
  • weighted noise -75dB
  • Ringing voltage130VP-P
  • Constant current 23-31mA
  • Supply Voltage3.2V-5.5VDC

 

Description

  • The R-TONE KS0835F is a single Subscriber Line Interface Circuit (SLIC).
  • The combination of features and packaging offers extremely efficient use of board area, saving  significant system size and cost, minimising time to market for Telephony Systems developers.
  • The KS0835F has been designed to work with loop lengths of typically 1.0km
  • The KS0835F has integral dc/dc converter and ringing generation thus providing all the line powering requirements from a single supply.24V(off-hook)and 48V(on-hook)and 75V(ringing).
  • The KS0835F requires a minimum of external components, making it ideal for low line count, short loop length applications, such as WLL Terminal (WLL), Fixed Cellular Terminals (FCT), Fixed Wireless Terminals (FWT) and Internet Telephony (VoIP).
  • The KS0835F has an integral DC/DC converter, which generates the battery voltage in the device.  This means that only a single supply of between +3.3V to +5.0V is needed, unlike conventional SLICs which will also need a battery voltage of anything between 20V and60V ( 75V for ringing).  This confers a significant cost, space and time to market benefit on the equipment designer.

 

Absolute Maximum Ratings

 

Parameter

Symbol

Min

Max

Units

1

DC Supply Voltage

VCC

-0.3

5.5

V

2

Maximum Power Dissipation, Off Hook @ 25oC

PSLIC

 

1.2

W

3

Operating Temperature

TOP

0

70

OC

4

Storage Temperature

TS

-40

+100

OC

 

DC Electrical Characteristics*

Characteristic

Sym

Min

Typ

Max

Units

Test Comments

 

 

 

Supply Current 

 

 

ICC

 

40

50

 

mA

 

5V  (on-hook)

3.3V(on-hook)

 

270

320

 

mA

5V  (off-hook)

3.3V(off-hook)

during ring

 

180

220

 

mA

5V  (during ring)

3.3V(during ring)

 

 

 

 

 

Constant current

Ibat

21

23

35

mA

 

Power Dissipation

Pd

 

30/850

 

 

mW

 

On/off hook (during 23mA Constant current)

Ringing voltage

Ving

 

130

 

VP-P

 

off-hook voltage

Vab

 

48

 

V

 

 

Supply current in power down

 

IPD

 

7

5

 

mA

mA

@ 5.0V

@ 3.3V

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

 

AC Electrical Characteristics*

Characteristic

Sym

Min

Typ

Max

Units

Test Comments

Two- Wire Impedance

Z0

 

600

 

Ω

 

Absolute Voltage Gain

T,R-VX

VR-T,R

-6

-6

0

0

6

6

dB

 

Relative Gain. Referenced to 1kHz

Gf

-0.5

 

+0.5

dB

Over frequency range 300 to

3400 Hz

Two-wire return loss

RL

30

 

 

dB

300-3400HZ,600R load

Four-wire return loss

THL

30

 

 

dB

300-3400HZ, 600R load

unbalanced to ground

 

60

 

 

dB

300-3400HZ,off-hook

common-mode rejection ratio

CMRR

45

55

 

dB

 

weighted noise

 

-75

 

 

dB

 

total harmonic distortion

THD

70

 

 

dB

300-3400HZ,off-hook

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.

 

Pin Description:

Pin #

Name

Description

1

RING

Ring. Connects to the subscriber line Ring.

2

TIP

Tip. Connects to the subscriber line Tip.

3

F/R,25Hz

Forward/Reverse.  A logic (H) will reverse the Tip and Ring voltage polarities.  F/R is toggled to produce the ringing output.

Logic (L) for other modes.

 

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

VR

Audio In Negative. Analog input signal from the Codec (which is output on Tip and Ring).

7

VX

Audio Out. This is the analog output signal (from Tip and Ring)

to the Codec.  

8

NC

No Connection.  Do not connect to this pin.

9

GND

DC/DC Ground.  Ground input for the DC/DC converter.

10

+VDC

DC/DC Supply.  +5.0V or +3.3V input for the DC/DC converter.

 

11

 

PD

Power Down DC/DC Converter. A logic (L) on this pin powers down the module.  DO NOT put logic (H) on this pin.

 

 

 

1 Ringing

The ringing signal is generated by switching the SLIC into ringing mode, by setting the RM pin high, and  then toggling the F/R pin at the required frequency and cadence. The toggling  of  the  F/R  pin  produces  a  balanced  signal  at  Tip  and  Ring.

During ringing the integral DC/DC converter is switched produce a battery voltage of  75V.The  slope of the edges on the ringing waveform is set internally to give the correct waveform with 20Hz to 25Hz ringing frequency.

 

2 Tip & Ring Polarity Reversal

If F/R is held at logic (H) (Forward) the d.c. voltage at Ring is negative with respect to Tip. If F/R is taken to logic (L) (Reverse) the voltage at Ring is positive with respect to Tip.

 

3 Switch Hook Detection

When an “off-hook” condition occurs during ringing, the ring-trip circuit on the KS0835F 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  pulses.  。 

 

KS0835FProduct Selector

Marking

Supply Voltage (V)

Constant current feed to line (mA)

Gain  2 Wire to VOUT

Gain VIN to 2Wire

Ringing voltage (Vp-p)

Supply Current, on-hook (mA)

Supply current, off-hook

(mA)

Ringing Load (REN)

Package

KS0835F

3.2~5.5

23~31

0dB

0dB

120~135

50-35

310-270

3

SIL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PackageSize: (mm   ±3mm )

PCB Decal : (mm   ±3mm )