MC33219A Datasheet, PDF (6/28 Pages) Motorola, Inc – Voice Switched Speakerphone

Freescale SMeCm33i2c1o9Anductor, Inc.
PIN FUNCTION DESCRIPTION
Pin Symbol
Description
1
CP2 A capacitor at this pin stores voltage representing the transmit background noise and speech levels
for the background noise monitor.
2
XDI Input to the transmit background noise monitor.
3
CPT An RC sets the time constant for the transmit background noise monitor.
4
TLI Input to the transmit level detector.
5
TLO Output of the transmit level detector.
6
VB
A mid–supply reference voltage, and analog ground for the amplifiers. This must be well bypassed for
proper power supply rejection.
7
CT
An RC sets the switching time between transmit, receive and idle modes.
8
CD Chip Disable (Logic Input). When low, the IC is active. When high, the entire IC is powered down and
non–functional, except for VB. Input impedance is nominally 125 kΩ.
9
NC No internal connection.
10
CPR An RC sets the time constant for the receive background noise monitor.
11
RLI Input to the receive level detector.
12
RLO Output of the receive level detector.
13
GND Ground pin for the entire IC.
14
RAO Output of the receive attenuator.
15
RAI Input to the receive attenuator and the dial tone detector. Input impedance is nominally 100 kΩ.
16
RXO Output of the receive amplifier.
17
RXI Inverting input of the receive amplifier. Bias current flows out of the pin.
18
MUTE Mute Input (Logic Input). A logic low sets normal operation. A logic high mutes the microphone
amplifier only. Input impedance is nominally 67 kΩ.
19
VLC Volume control. When VLC = VB, maximum receive gain is set when in the receive mode. When
VLC = VB – 1.0 V, receive gain is down ≈ 40 dB. No effect in the transmit or idle mode. Current flow is
out of the pin. Input impedance is nominally 167 kΩ.
20
MCI Inverting input of the microphone amplifier. Bias current flows out of the pin.
21
MCO Output of the microphone amplifier.
22
TAI Input of the transmit attenuator. Input impedance is nominally 100 kΩ.
23
TAO Output of the transmit attenuator.
24
VCC Power Supply Pin. Operating Range is 2.7 V to 6.5 Vdc. Bypassing is required.
6
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