TFB3869 GSG | Alldatasheet

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GSG 勁力半導体 Gunter Semiconductor GmbH TFB3869 EDITION 09/00 One Chip Subscriber Line Interface (SLIC) For inquiry please contact : China Tel: 0086-755-3200442 Fax: 0086-755-3355520 Hong Kong Tel : 00852-26190748 Fax: 00852-24948080 e-mail sales@gsg-asia.com

Subscriber Line Interface Circuit (SLIC)

Features

  • High balance without external precession devices
  • Low supply current
  • Direct coupling with standard CODECs
  • Subscriber feeding by integrated constant current sources
  • Programmable constant current by external resistor
  • Hybrid function, programmable via external components
  • Logic output for ground key detection
  • Logic output for loop current detection Package
  • SOP 20 TFB3869T Preliminary Technical Data Edition 09/00 0...10 0.27 +0.05-0.04 ‡ 0.3 14 13 12 1120 19 18 17 16 15 567891 03412 12.85 – 0.1 0.42 –0.07 7.4 + 0.2 10.4 – 0.2 1.27£ 0.82 0.25 M 0.15 2.30+ 0.1 - 0.050.2 – 0.1 £ 2.65 09/00 1

1 - HK Negative output for transmitter direction 2 n. c. This pin is internally used. It is not permitted to connect any external components.

3 ISET Control input for loop current

4 ZOUT Output, network for hybrid function

5 ZIN Input, network for hybrid funktion

6 ET Output, ground key detection

7 LD Output, loop current detection

8 LA Line output

9 n. c. This pin is internally used. It is not permitted to connect any external components.

10 VBAT Negative supply voltage

11 LB Line output

12 n. c. This pin is internally used. It is not permitted to connect any external components.

13 GND Ground

14 n.c. This pin is internally used. It is not permitted to connect any external components. 15 +CR External capacitor for AC/DC selction 16 -CR External capacitor for AC/DC selction 17 +MIC Positive input for receive direction 18 -MIC Negative input for receive direction

19 VCC Positive supply voltage

20 +HK Positive output for transmitter direction Pin Description VBAT Supply voltage -24 V VCC Supply voltage +5 V GND Ground ISET Control input for loop current Voltage drop on grounded resistor of 23,3 V. LA, LB Subscriber line, I LA/LB = 120 (ISET) = 120 . The subscriber line current is determined by the ISET current. +MIC; -MIC Differential input for the receive direction The input resistance is 10 kΩ per pin, the output voltage in receive direction line is four times the MIC voltage. +HK; -HK Differential output for the transmitter direction with unit gain of the input signal of the subscriber line with common mode offset voltage of + 2.5 V ZIN Current node input for hybrid amplifier ZNB = 50 (sum) ZOUT Driver output for hybrid function ET Logic output for ground key detection (low-aktiv) LD Logic output for loop current detection (low-aktiv) +CR; -CR External capacitor for hybrid function All Pin are ESD protected except PIN 2, 9, 12 and 14. TFB3869T 23.3 V RSET

-HK VCC GND LD VBAT VCC

3 ISET

4 ZOUT

5 ZIN

+MIC -MIC ET VBAT VCC +HK VCC GND 1 -HK 7L D

3 ISET 8L A

4 ZOUT 11 LB

5 ZIN 17 +MIC

Pin Symbol Circuit Pin Symbol Circuit

Absolute maximum ratings Symbol Min. Max. Unit Ta = 0°C up to 70°C Positive supply voltage +5V 0 5.25 V Negative supply voltage -24V -25.25 0 V All other pins Pin10 - 0.3 Pin19 + 0.3 V Junction temperature T j - 150 °C TFB3869T x CODEC TRANSMIT +5V xx x CODEC RECEIVER +MIC -MIC ISET ZOUT ZIN VBAT LA LB GNDLDET-CR+CRVCC +HK -HK RSET IMITATION LINE IMPEDANCE -24V Hybrid-C +5V TFB 3869 T VBAT 2 8 1376161519 34 5 1 0

Electrical Characteristics

VBAT = -24 V, VCC = +5 V, Ta = 25 °C Parameter Symbol Min. Max. Unit Supply current I CC - 1.0 mA Loop current I SCHL 20 24 mA Supply current I BAT-ISCHL -3 - mA Symmetrical voltage V SYM 11 13 V Biaspoint +HK V +HK 23 V Biaspoint -HK V -HK 23 V Offset HK V +HK - V-HK -250 250 mV LD-detection (low) V LD - 0.4 V ILD = 200 µA LD-detection (high) I LD -2 µ A VLD = 5 V ET-detection (low) V ET - 0.4 V IET = 200 µA ET-detection (high) I ET -2 µ A VET = 5 V AC Characteristics VBAT = -24 V, VCC = +5 V, Ta = 25 °C Parameter Symbol Min. Max. Unit Balance two wire a 2-2 54 - dB Balance two wire to four wire a 2-4 58 - dB Loss MIC/HK aMIC/HK 12 - dB Gain for receiver direction G R 10.5 13.5 dB Gain for transmitter direction G T -7.5 -4.5 dB TFB3869T

Test Circuit, Base Block -HK 20 19 18 17 16 15 14 13 12 11 1234567891 0 N.C. ISET ZOUT ZIN ET LD LA N.C. VBAT +HK VCC -MIC +MIC -CR +CR N.C. GND N.C. LB TFB 3869 T 10k 10k +5V MIC 10m LB 221 909 115n LA -24VLDET 20k 4.7n 5.4k 120k HK 10m -HK 20 19 18 17 16 15 14 13 12 11 1234567891 0 N.C. ISET ZOUT ZIN ET LD LA N.C. VBAT +HK VCC -MIC +MIC -CR +CR N.C. GND N.C. LB TFB 3869 T 10k 10k +5V MIC 10m LB 221 909 115n LA -24VLDET 20k 4.7n 5.4k 120k HK 10m 1 : 1 TFB3869T

Test Circuit, Balance, Two Wire 10 m base block LB LA 300 300 EL VL a2-2 = 20 log EL VL 0.1 f ( kHz ) Balance two wire a2-2 0.2 0.3 0.6 1 2 3 6 10 80a2-2 ( dB ) TFB3869T

Test Circuit, Balance Two Wire To Four Wire 10 m base block LB LA 300 300 EL VHK +HK -HK 5 k a2-4 = 20 log EL VHK 0.1 f ( kHz )0.2 0.3 0.6 1 2 3 6 10 80a2-4 ( dB ) Balance two wire to four wire a2-4 TFB3869T

Test Circuit, Return Loss 115 nbase block LB LA 221 909 EMIC VHK +HK -HK 5 k MIC aR = 20 log EMIC VHK 0.1 f ( kHz )0 . 2 0 . 3 0 . 6 1236 1 0 0aR ( dB ) Return loss aR TFB3869T

Test Circuit, Receiver Gain 115 nbase block LB LA 221 909 EMIC Va/b GR = Va/b EMIC MIC 0.1 f ( kHz )0.2 0.3 0.6 1 2 3 6 10

10 G R ( dB )

Test Circuit, Transmitter Gain 115 nbase block LB LA 221 909 VHK Ea/b +HK GT = VHK Ea/b -HK 0.1 f ( kHz )0.2 0.3 0.6 1 2 3 6 10 -7.5 -6 G T ( dB ) Transmitter gain GT -6.5 -5.5 TFB3869T

Loop connected, no gound key High High Loop connected, ground key aktiv High Low Loop disconnected, no ground key Low High Loop Detection Condition for switching of the logic output LD: ISCHL * RL = VBAT - 5V Status of the logic output LD depending on loop current: LD = Low LD = High ISCHL * RL > VBAT - 5V I SCHL * RL < VBAT - 5V Loop Resistance The useable loop resistance can be calculated as follows: In accordance with the conditions menioned above a reliable loop detection will be guaranteed for a closed loop resistance value lower than 815 Ω . TFB3869T RL < (VBAT - 5V) ISCHL RL < (VBAT - 5V) 120 * 23.3V * RSET

For ground key detection the LA or LB outputs have to be connected to ground. In this case the voltage drop on an internal differential amplifier reaches 1 V in minimum for switching the ET output from high to low. Protection Circuit VBAT LA LB GND TFB 3869 T VBAT GND a b < 1n < 1n 09/00 13 Copying is generally permitted, indicating the source. However, our consent must be obtained in all cases. MEGAXESS reserves the right to make changes in specifications at any time and without notice. The information and suggestions are given without obligation and cannot give rise to any liability, they do not indicate the availability of the components mentioned. The information included herein is believed to be accurate and reliable. However, MEGAXESS assumes no responsibility for its use; nor for any infringements of patents or of other rights of third parties which may result from its use. Megaxess GmbH Deutschland • POB 1370 • 15236 Frankfurt(Oder) • Germany Phone +49 335 2005 • FAX +49 335 3251 • Internet http://www. megaxess.de TFB3869T