MC33215B Freescale Semiconductor, MC33215B Datasheet - Page 16

• Manufacturer Part Number: MC33215B
• Manufacturer: Freescale Semiconductor

Specifications of MC33215B

• Max Transmitter Gain: 58dB
• Receiver Gain (max): 27dB
• Operating Temp Range: -20C to 70C
• Package Type: SDIP
• Pin Count: 42
• Operating Current: 15mA
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Lead Free Status / Rohs Status: Not Compliant

capacitively to the pins for dc decoupling, and also to create
a high pass filter to suppress low frequent background noises
like footsteps and 50 Hz.
discharging the C
transmit to receive or vice versa is fast, on the order of
milliseconds, and is proportional to the value of C
switch–over to idle mode is slow, in the order of a few
seconds, and is proportional to the product of the values of
R
behavior when applying transmit and receive stimuli.
SWT
100.0E–3
100.0E–6
16
The resistors for the sensitivity setting have to be coupled
The switch–over timing is performed by charging and
10.0E–3
10.0E–6
1.0E–3
and C
TSE > RSE
100
1
1
0
0
0
SWT
. Figure 16 depicts a typical switch–over
SWT
1000
capacitor. The switch–over from
A. Receive Monitor
Transmit
Receive
TSE > TBN + 13 mV
SWT
R
RSA
Freescale Semiconductor, Inc.
Figure 15. Compression Range of the Signal Monitors
( )
For More Information On This Product,
1
0
X
X
X
10000
Table 3. Logic Table for Switch–Over
Figure 16. Switch–Over Behavior
Go to: www.freescale.com
Upper Limit of
Compression
Dial Tone
Threshold
Lower Limit of
Compression
SWT
. The
MC33215
RSE > V
100000
X
X
1
0
0
100.0E–3
100.0E–6
DDT
10.0E–3
MC33215 are not the only factor in designing a handsfree
speakerphone. During the design the acoustics have to be
taken into account from the beginning. The choice of the
transducers and the design of the cabinet are of great
influence on the speakerphone performance. Also, to
achieve a proper handsfree operation, the fine tuning of the
components around the duplex controller have to be done
with the final choice of the cabinet and the transducers.
1.0E–3
The electrical characteristics and the behavior of the
100
RSE > RBN + 13 mV
MOTOROLA ANALOG IC DEVICE DATA
1000
X
X
X
1
0
B. Transmit Monitor
R
TSA
VMC + 0.5
VMC – 0.5
( )
Transmit
Idle
Receive
Receive
Idle
10000
Upper Limit of
Compression
Lower Limit of
Compression
Mode
100000