U4080B TEMIC Semiconductors, U4080B Datasheet - Page 11

• Manufacturer Part Number: U4080B
• Description: Voice-Switched Circuit for Handsfree Operation
• Manufacturer: TEMIC Semiconductors

TELEFUNKEN Semiconductors
Rev. A1, 20-May-96
V
5.4 V
V+ is (typically) 80 mV greater than the regulated value
of V
external use. The output impedance is
capacitor indicated for connection to Pin 20 is essential
for stability reasons. It must be located adjacent to the IC.
If the circuit is deselected (see the section on chip select),
the V
If the integrated circuit, U4080B, is to be powered from
a regulated supply (not the Tip and Ring lines) of less than
6.5 V, the configuration of figure 14 may be used so as to
ensure that V
applied to both V+ and V
as to turn off the internal regulator (the Chip Select
function is not available when the circuit is used in this
manner). Figure 15 indicates the supply current by this
configuration, with no signal at the speaker. When a
signal is sent to the speaker the curves of figure 13 apply.
94 7883 e
CC
94 7878 e
CC
CC
"
(Pin 20) is a regulated output voltage of
. Up to 3 mA can be sourced from this supply for
40
30
20
10
voltage will go to 0 V.
0.5 V. Regulation will be maintained as long as
0
4
Figure 14. Regulated power supply
CC
T
amb
U 4080 B
22
is regulated. The regulated voltage is
= 25 C
6
Figure 13.
20
CC
V
, with CS held at a logic 1 so
16
8
( V )
100 mW
18
80 mW
50 mW
20 mW
5 mW
200
Preliminary Information
x
16
m
10
F
20 . The 47 F
12
V+
V
V
2.9 V
holding a value of approximately 54% of V
can be sourced from this supply at a typical output
impedance of 250
connection to the V
and must be adjacent to the IC. If the circuit is deselected
(see section on chip select), the V
Chip Select
The Chip Select pin (Pin 18) allows the chip to be pow-
ered down anytime its functions are not required. A logic
1 level in the range of 1.6 to 11 V deselects the chip, and
the resulting supply current (at V+) is shown in figure 12
The input resistance at Pin 18 is
the V
deselected. Leaving Pin 18 open is equivalent to a logic
O (chip enabled).
B
B
94 7879 e
is a regulated output voltage with a nominal value of
B
"
regulated voltages go to zero when the chip is
40
30
20
10
0
0.4 V. It is derived from V
4
Allowable operating
B
5
T
voltage range
. The 47 F capacitor indicated for
pin is required for stability reasons,
amb
Figure 15.
= 25 C
V+ ( V )
6
y
B
voltage will go to 0 V.
U4080B
75 k . The V
7
CC
and tracks it,
CC
. 1.5 mA
11 (15)
8
CC
and