Electronic Components Datasheet Search |
|
TEA1085T Datasheet(PDF) 8 Page - NXP Semiconductors |
|
TEA1085T Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 32 page March 1992 8 Philips Semiconductors Preliminary specification Listening-in circuit for line-powered telephone sets TEA1085; TEA1085A Supply amplifier stability (SDC) pin 3 To ensure stability of the TEA1085/TEA1085A, in combination with a transmission IC of the TEA1060 family, a 47 pF capacitor connected between SDC and SUP and a 150 µH coil connected between SUP and the positive line terminal (Fig.16) is required. Loudspeaker amplifier (LSI1/LSI2 and QLS1/QLS2) pins 5/6, 21/22 The TEA1085/TEA1085A have symmetrical inputs at LSI1 and LSI2. The input signal is normally taken from the earpiece output of the transmission circuit via a resistive attenuator (see Fig.3). The amount of attenuation must be chosen in accordance with the receive gain of the transmission IC (which depends on the sensitivity of the earpiece transducer). The maximum input signal level is 450 mV(RMS) at Tamb = +25 °C. The outputs QLS1 and QLS2 can be used for single ended drive (SE) or bridge tied load drive (BTL). The output stages have been optimized for use with a 50 Ω loudspeaker (e.g. Philips type AD2071). The gain of the amplifier is fixed to ≈ 35 dB for the SE drive and ≈ 41 dB for the BTL drive (when the inputs for logic control are left open-circuit or are connected to VSS). The volume control can be obtained by using a potentiometer at the input and/or by the logic control function. Fig.5 Stabilized supply voltage as a function of R38. ndbook, halfpage 5.5 3.5 MGR035 10 102 103 3.9 4.3 4.7 5.1 R38 (k Ω) VBB (V) VBB = 3.60 V Logic gain control (GSC1 and GSC2) pins 7 and 8 The logic inputs GSC1 and GSC2 can be used to reduce the gain of the loudspeaker amplifier by means of the logic gain control function in 3 steps of 6 dB. Table 1 Data for microcontroller drive of logic inputs Where: 0 = connection to VSS or left open-circuit 1 = applying a voltage ≥ VSS + 1.5 V GSC2 GSC1 gain (dB) gain reduction (dB) 0 0 35 0 0 1 28.7 6.3 1 0 22.2 12.2 1 1 17 18 |
Similar Part No. - TEA1085T |
|
Similar Description - TEA1085T |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |