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Электронный компонент: U2535B-FP

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U2535B
Rev. A2, 15-Oct-98
1 (6)
Preamplifier for IR Remote Control
Description
The IC U2535B is a complete IR receiver for data com-
munication. The PIN photodiode converts the transmitted
IR telegram into electronic input signals. This is sepa-
rated by a special input circuit. The characteristics (filter,
gain) of the following amplifier are determined by exter-
nal components. The signal detector, consisting of a
comparator, an integrator and a Schmitt trigger, forms the
input signal to an output pulse that can be interfaced to a
microcomputer.
Features
D Low current requirement (typical 260 mA/ 12 V)
D Carrier frequencies 20 to 100 kHz
D Supply voltages:
5 or 7 to 16 V with internal stabilization
D Filter characteristics and gain are specified by few
external components
D Demodulator with Schmitt trigger
D Open collector output
Applications
D Keyless entry
D Remote control
D Wireless data transfer
Ordering Information
Extended Type Number
Package
Remarks
U2535B-FP
SO8
Block Diagram
Integrator
+V
CC
R
1
1
2
3
A1
A0
C3
C
1
C
2
R
2
C
3
5
7
4
V
S
1 k
W
10
mF
V
S1
10
mF
+V
O
SW
6
GND
8
IN
95 9958
+
+
+
Supply voltage
for PIN diode
Figure 1. Block diagram
U2535B
Rev. A2, 15-Oct-98
Preliminary Information
2 (6)
Pin Description
1
2
3
4
8
7
6
5
95 10323
A
I
A
O
C
3
O
SW
IN
V
S1
GND
V
S
Figure 2. Pinning
Pin
Symbol
Function
1
A
I
Inverting input of bandpass
amplifier, pin connection for
external filter function
2
A
O
Output of bandpass amplifier
3
C
3
Capacitor at Pin 3 to reject
(suppress) ripple during trans-
mission, also functions as delay
time for reference voltage of the
comparator
4
O
SW
Switching output
Open collector output which
switches with time delay and
turns to LOW (transistor
switched ON) when the signal is
identified at Pin 2.
5
V
S
Supply voltage
The integrated Z-diode (typically
17 V) protects the circuit against
positive voltage spikes
6
GND
Ground
7
V
S1
Unregulated supply voltage for
5 V operation
8
IN
Input connection for photodiode
with regulated bias voltage
Absolute Maximum Ratings
Reference point Pin 6, unless otherwise specified
Parameters
Symbol
Value
Unit
Supply-voltage range
Pin 5
V
S
0.3 to +16
V
Supply currents:
Pin 5
tp
250 ms
Pin 5
I
S
i
S
20
150
mA
mA
Input voltages
Pin 1
Pin 4
Pin 8
V
A(I)
V
0(SW)
V
IN
0.3 to 5
0.3 to 16
0.3 to 5
V
V
V
Output currents
Pins 2 and 4
I
0
5
mA
Junction temperature
T
j
125
C
Storage-temperature range
T
stg
40 to +125
C
Ambient-temperature range
T
amb
40 to +105
C
Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient
R
thJA
180
K/W
U2535B
Rev. A2, 15-Oct-98
3 (6)
Electrical Characteristics
T
amb
= 25
C, reference point Pin 6, test circuit, unless otherwise specified
Parameters
Test Conditions / Pins
Symbol
Min.
Typ.
Max.
Unit
Supply currents
V
S1
= 5 V, I
IN
= 0, Pin 7
V
S
= 12 V, I
IN
=0, Pin 5
I
S1
I
S
140
200
200
320
mA
mA
Internal stabilization
V
S
= 12 V, I
IN
= 0, Pin 7
V
S1
4.9
5.4
V
Maximum input current
V
S1
= 5 V, V
IN
= 0, Pin 8
I
IN
0.8
1.2
mA
Low-level voltage
V
S1
= 5 V, I
OL
= 0.5 mA
Pin 4
V
OL
0.2
V
Leakage current
V
S1
= 5 V, V
0
= 12 V, Pin 4
I
OH
1
mA
Input stage, amplifier
Cut-off frequency
f
L
f
H
100
15
kHz
kHz
Gain
v
i
= 2 mV
rms
,
f = 40 kHz
f = 100 kHz
G
v
G
v
47
46
50
49
dB
dB
Detector
Threshold voltage
t
d
200
ms, f = 40 kHz,
Pin 2
V
A0
150
mV
rms
Delay time
f = 40 kHz, V
A0
= 1 V
rms
see figure 4
t
d
50
90
ms
Storage time
f = 40 kHz, V
A0
= 1 V
rms
see figure 4
t
s
100
150
ms
Test Circuit
7
47 k
W
4
6
Output
+5 V
3
R
1
300 k
W
C
i
C
3
100 nF
22 nF
1 k
W
R
2
2
1
8
10 nF
C
2
I
IN
300 k
W
R
i
V
i
U2535B
95 9959
5
Figure 3. Test circuit
U2535B
Rev. A2, 15-Oct-98
Preliminary Information
4 (6)
V
V
AO
V
L
t
d
t
s
400 T
t
95 9960
Figure 4. Waveforms for t
d
and t
s
measurement
Application Circuit
8
7
6
5
1
2
3
4
U2535B
1 k
W
10
mF
10
mF
300 k
W
+12 V
R
1
C
1
C
2
680 pF
100 pF
R
2
1.2 k
W
C
3
47 nF
22 k
W
+
95 9961
mC
Figure 5. Application circuit
U2535B
Rev. A2, 15-Oct-98
5 (6)
Bandpass Filter Design
Center frequency
f
O
+
1
2
p R
1
C
1
R
2
C
2
GAIN
[
R
1
C
1
R
2
(C
1
) C
2
)
R
1
>> R
2
C
1
y C
2
Bandwidth
[
C
1
) C
2
2
p R
1
C
1
C
2
BW << f
O
Note: R
1
should be about 300 k
W.
Results can be influenced by feedback (Pin 2
! Pin 8)
Package Information
13034
technical drawings
according to DIN
specifications
Package SO8
Dimensions in mm
5.00
4.85
0.4
1.27
3.81
1.4
0.25
0.10
5.2
4.8
3.7
3.8
6.15
5.85
0.2
8
5
1
4