SAE800XK Infineon Technologies, SAE800XK Datasheet - Page 6

• Manufacturer Part Number: SAE800XK
• Manufacturer: Infineon Technologies

Specifications of SAE800XK

• Lead Free Status / Rohs Status: Compliant

Digital / Analog Converter, Loudness and Junction Control
The DAC converts the 4-bit words from the logic into the appropriate staircase currents with the
particular tone frequency. The sum current
generator produces the DAC reference current
external resistor to ground. The chip temperature is monitored by the junction control. At
temperatures of more then approx. 170 ˚C the stop input will switch the output current
output current is enabled again once the chip has cooled down to approx. 150 ˚C.
Current Amplifier
The current amplifier with a gain of 1600 boosts the current
approx. 750 mA maximum. The output stage consists of an NPN transistor with its emitter on power
GND and collector on pin Q.
The current control insures that the output stage only conducts defined currents. In conjunction with
the integrated thermal shutdown, this makes the configuration shortcircuit-protected within wide
limits. Because of the absence of feedback the circuit is also extremely stable and therefore
uncritical in applications. Resistor
resistive component of the loudspeaker impedance
The output amplitude of the current
(only 3 tone mode), so
The following applies:
I
3 x B x (
the result is:
R
R
Semiconductor Group
Q
L
L
=
=
=
I
R
R
Imax
Q
Q
x 3 x B x (
x K x (
V
x B = (
L
/
R
L
V
)
V
L
S
/ 0.8
0.8
V
–
L
V
/ 0.8
V
sat
V
R
S
) /
S
L
/
)
has to be scaled for this point.
R
V
R
Q
S
Q
)
0.8
R
V
L
I
S
on pin L sets the output voltage swing. This assumes that the
I
reaches the maximum
/
R
Q
I
I
drives the following current amplifier. The loudness
I
6
L
for all three tones. This requires connecting an
R
Q
responds similarly as the resistance
with: B = 1600
with: K = 4800
I
I
Imax
I
from approx. 470 A maximum to
3 x
V
L
/
R
L
at a time
I
I
to zero. The
SAE 800
t
of 2.33 s
R
L
.