U4030B-AFL

U4030B TEMIC | Alldatasheet

Document overview

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Technical content

Features

/C0068Microphone amplifier with – Symmetrical input – Privacy function – Anticlipping /C0068Built in ear protection /C0068Power down input /C0068Mute input /C0068DTMF interface /C0068Low line impedance during pulse dialing Benefits /C0068Independent adjustment of – Transmission gain – Receiving gain – Sidetone suppression – Frequency response /C0068Low-impedance supply voltage for all external blocks /C0068Supply voltage for an electret microphone

Applications

/C0068Standard telephone /C0068Fax machine /C0068Answering machine /C0068Cordless telephone Block Diagram MIC2 MIC1 PRIV DTMF GT MICO ST GR RECO CK VL RDC VC VVSW AMPGNDPDMUTECLIM Limiter Mute Power supply U 4030 B TXA REC.A TT. Ear protection 765911 3 81 7 1 4 1 8 1 2 0 93 7618 eDM Figure 1.

Ordering Information

Extended Type Number Package Remarks U4030B-AFL SO20 U4030B-AFLG3 SO20 Taped and reeled

Rev. A2, 27-Jan-982 (14) Pin Description CK ST GR RECO MUTE V C CLIM PD PRIV ACY V L GND MIC2 MIC1 RDC SWAMP DTMF GT V M V D MICO Pin Symbol Function

1 V M Supply voltage for an elecret

microphone, virtual ground

2 V C The internal inductance of the

circuit is proportional to the value of the capacitor at this pin. A resistor connected to ground may be used to reduce the line voltage

3 CLIM Time constant of anticlipping in

trans. path

4 CK Input of receive amplifier

5 ST Input of sidetone amplifier, must

M

6 G R Input for receive gain control

7 RECO Output of receiving amplifier

8 MUTE Active high input to switch

9 MICO Output of microphone amplifier

10 DTMF Input for DTMF signals (AC-

coupled). In mute condition a small portion of the signal at this pin is monitored to the receive output

11 GT Input for transmit gain control

12 MIC1 Inverting input of microphone

13 MIC2 Non-inverting input of

14 GND Ground (reference point for DC

and AC signals)

15 V L Line voltage

16 PRIV ACY Active high input to disable

17 PD Power down input. Active high input for reducing the current consumption of the circuit. Simultaneously V L is shorted by an internal switch

18 SWAMP A resistor connected from this

point to ground converts the excess line current into heat in order to prevent the IC from thermal destruction at high line currents

19 RDC Input of power supply

20 V D Unregulated supply voltage for

peripheral circuits. Output current capability and output voltage increase with line current

Figure 5. Typical DC characteristics for various

1 V / div

Figure 6. Charge up characteristics at IL = 20 mA being decoupled via an electronic inductance. threshold of the limiter is fixed at 5.5 dBm (typical). the transmit and receive gain.

The receive signal is taken from line via capacitor CCK . impedance at Pin 4 is typically 80 k/C0087. due to clipping by ear protection. and transmit gain are set outside of the sidetone loop. internal power down switches off all internal amplifiers. power down while sending the dial pulses (figure 8). Figure 7. Schematic of the sidetone

Figure 8. Recommended timing diagram for power down diagram

Rev. A2, 27-Jan-98 7 (14)

Electrical Characteristics

f = 1000 Hz, Tamb = 25/C0095C, reference point Pin 14, unless otherwise specified Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit DC characteristics (figure 9) DC voltage in speech modeIL = 19 mA IL = 26 mA IL = 60 mA V L 6.2 10.0 6.5 7.2 10.5 6.8 11.0 V V V Transmit amplifier and sidetone reduction (figure 10) Input resistance R I 45.0 60.0 80.0 k/C0087 Transmit gain IL = 24 mA G T 44.2 44.7 45.2 dB Gain variation 19 mA /C0120IL /C0120 60 mA /C0068G T –0.5 +0.5 dB Noise at line, psophometrically weighted R L = 600 /C0087 ZRECO = 68 nF ZMIC = 68 nF IL = 19 to 60 mA nO –75.0 dBmp Sidetone gain (figure 10) G ST 33.5 dB Max. output voltage R L → /C0082 d /C0120 5% V MIC = 5.4 mV V Omax 5.5 6.3 dBm Common mode rejection ratio CMRR 80.0 dB Mute: reduction of voltage amplification ZRECO = 68 nF 60.0 dB Privacy: reduction of voltage amplification 60.0 dB Receiving amplifier (figure 11) Gain ZRECO = 68 nF IL = 24 mA Gain variation 19 mA /C0120 IL /C0120 60 mA /C0068G R –0.5 0.5 dB Noise at earphone psophometrically weighted IL = 19 to 60 mA Load T, R = 600 /C0087 ZRECO = 68 nF ZMIC = 68 nF nI –78 dBmp Max. output voltage IL = 19 to 60 mA ZRECO = 68 nF d /C0120 2% V Omax 600 650 mVrms Switching threshold of ear protection IL = 19 to 60 mA ZRECO = 68 nF VGEN = 3 Vrms 0.7 1.3 Vrms V oltage amp. from DTMF to RECO Zear = 68 nF –7 –4 –1 dB Output impedance 10 /C0087 Power down (figure 12) PD-off input voltage V I 0.3 V PD-on input voltage V I 2 V Input current V I = 6 V II 130 /C0109A Line voltage PD on, IL = 24 mA V L 1.5 V Input current consumption at VD PD on ID 100 /C0109A

Rev. A2, 27-Jan-988 (14) UnitMax.Typ.Min.SymbolTest Conditions / PinsParameters Mute input, (figure 12) MUTE input current V MUTE = 6 V V MUTE = 0.3 V IMUTE 120 –25 /C0109/C0065 /C0109A MUTE-off input voltage V MUTE 0.3 V MUTE-on input voltage V MUTE 1.5 V Supply voltages (figure 10) Output voltage IL = 19 mA ID = 4.5 mA V MIC = 10 mV IL = 50 mA ID = 15 mA V MIC = 10 mV V D 4.0 5.5 4.5 6.2 V V Output voltage IL = 19 mA ID = 3 mA IM = 300 /C0109A V M 2.2 V Output current IM 300 /C0109A Output resistance R O 300 /C0087 DTMF-amplifier (figure 12) Input resistance R D 22 31 37 k/C0087 DTMF-gain Load = ZR 0 < Rv < 1530 /C0087 G D 24.7 26 27 dB Max. output voltage IL = 19 to 60 mA Load = ZR d /C0120 2%

1.8 V rms

Privacy (figure 12) PRIV-on input voltage V PRIV 2 V PRIV-off input voltage V PRIV 0.8 V Input current V PRIV = 6 V IPRIV 60 /C0109A

Figure 9. Application Circuit

1000 CVD

680 PR 1

Figure 10. Transmit gain

1000 RDC

10 CLIM

680 RR1

Figure 11. Receiving gain and sidetone amplification

Figure 12. DTMF gain

Rev. A2, 27-Jan-9814 (14) Ozone Depleting Substances Policy Statement It is the policy of TEMIC Semiconductor GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances (ODSs). The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC Semiconductor GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency (EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively. TEMIC Semiconductor GmbH can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC Semiconductor GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2831, Fax number: 49 (0)7131 67 2423