TEA1069N datasheet(10/44 Pages) PHILIPS

10 / 44 page

1998 Jan 08

Philips Semiconductors

Product speciﬁcation

Versatile speech/dialler/ringer with

music-on-hold

TEA1069; TEA1069A

MICROPHONE INPUTS MIC+ AND MIC

− AND GAIN PINS GAS1 AND GAS2

The circuit has symmetrical microphone inputs. Its input impedance is 64 k

Ω (2 × 32 kΩ) and its voltage gain is typically

52 dB (when R7 = 68 k

Ω). Dynamic, magnetic, piezoelectric or electret (with built-in FET source followers) microphones

can be used. Microphone arrangements are illustrated in Fig.7.

Fig.7 Alternative microphone arrangements.

Pin numbers in parenthesis refer to the TEA1069H and TEA1069AH.

(1) Resistor may be connected to reduce the terminating impedance.

a. Magnetic or dynamic

microphone.

b. Electret microphone.

c. Piezoelectric microphone.

handbook, full pagewidth

MBH198

VEE

VCC

(1)

36 (32)

3 (41)

4 (42)

23 (18)

4 (42)

3 (41)

4 (42)

3 (41)

MIC

−

MIC

−

MIC

−

The gain of the microphone amplifier can be adjusted

between 44 dB and 52 dB to suit the sensitivity of the

transducer in use. The gain is proportional to the value of

R7 which is connected between GAS1 and GAS2. Stability

is ensured by two external capacitors, C6 connected

between GAS1 and SLPE and C17 connected between

GAS1 and VEE. The value of C6 is 100 pF but this may be

increased to obtain a first-order low-pass filter. The value

of C17 is 10 times the value of C6. The cut-off frequency

corresponds to the time constant R7

× C6.

RECEIVING AMPLIFIER IR, QR AND GAR

The receiving amplifier has one input (IR) and one output

(QR). Earpiece arrangements are illustrated in Fig.8.

The IR to QR gain is typically 31 dB (when R4 = 100 k

Ω).

It can be adjusted between 20 and 31 dB to match the

sensitivity of the transducer in use.

The gain is set with the value of R4 which is connected

between GAR and QR. The overall receive gain, between

LN and QR, is calculated by subtracting the anti-sidetone

network attenuation (32 dB) from the amplifier gain.

Two external capacitors, C4 and C7, ensure stability. C4 is

normally 100 pF and C7 is 10 times the value of C4.

The value of C4 may be increased to obtain a first-order

low-pass filter. The cut-off frequency will depend on the

time constant R4

× C4.

The output voltage of the receiving amplifier is specified for

continuous-wave drive. The maximum output voltage will

be higher under speech conditions where the peak to RMS

ratio is higher.

TEA1069N Datasheet(PDF) 10 Page - NXP Semiconductors

TEA1069N Datasheet(HTML) 10 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

Datasheet Download

Link URL