U4082B-DEV-BOARD Atmel, U4082B-DEV-BOARD Datasheet - Page 13

• Manufacturer Part Number: U4082B-DEV-BOARD
• Description: WiFi / 802.11 Modules & Development Tools Voice Switched Circuit
• Manufacturer: Atmel

3.14
4. Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Reference point pin 28, T
4743D–CORD–03/06
Parameters
Supply voltage, pin 4
Voltages
Pin 3, 12
Pin 13
Pin 2, 9, 21
Storage temperature range
Junction temperature
Ambient temperature range
Power dissipation
T
Maximum thermal resistance
Junction ambient, SO28
amb
= 60 C, SO28
Power Supply, V
amb
= 25 C, unless otherwise specified.
The power supply voltage at pin 4 (V
reduced operation is possible down to 2.8V (see
page
power-down mode.
The output voltage at V
the system. The output impedance at V
and in conjunction with the external capacitor at V
rejection.
capacitors. The capacitor value depends on whether the circuit is powered by the telephone line
or a power supply.
Since V
outputs is directly related to the rejection at VB, as well as their respective gains.
page 22
The chip disable (CD, pin 3) permits powering down the IC to conserve power and/or for muting
purposes. With CD < 0.8V, normal operation is in effect.
With 2.0V < CD < V
the hybrid amplifiers are disabled, and their outputs reach the high-impedance state. Addition-
ally, the bias is removed from the level detectors.
The bias is not removed from the filter (pins 1 and 2), the attenuators (pins 8, 9, 21 and 22), or
from pins 13, 14, and 15 (the attenuators are disabled, however, and will not pass a signal). The
input impedance at CD is typically 90 k , has a threshold of approximately 1.5V, and the voltage
at this pin must be kept within the range of ground and V
not used, the pin should be grounded.
B
, and Chip Disable
7). The power supply current is shown in
B
depicts this graphically.
biases the microphone and hybrid amplifiers, the amount of supply rejection at their
Figure 7-11 on page 21
S
, the IC is in power-down mode. In power-down mode, the microphone and
B
Symbol
(pin 15) is approximately (V
R
T
T
P
V
amb
T
thJA
stg
tot
S
j
gives an indication of the amount of rejection with different
S
) is between 3.5V and 6.5V for normal operation, but
B
is approximately 400 (see
Figure 7-9 on page 20
–1.0 to (V
–1.0 to (V
–0.5 to (V
Figure 7-6 on page 19
–1.0 to +7.0
–55 to +150
B
–20 to +60
S
, forms a low-pass filter for power supply
– 0.7) / 2, and provides the AC ground for
Value
125
520
120
S
S
S
S
(see
+ 1.0)
+ 0.5)
+ 0.5)
Figure 7-8 on page
Figure 7-10 on page
for both power-up and
and section
U4082B
Figure 8-1 on
20). If CD is
Unit
K/W
mW
V
V
C
C
C
“AGC” on
20),
13