Features
•
•
•
•
•
•
No External Components Except PIN Diode
Supply-voltage Range: 4.5V to 5.5V
Automatic Sensitivity Adaptation (AGC)
Automatic Strong Signal Adaptation (ATC)
Enhanced Immunity Against Ambient Light Disturbances
Available for Carrier Frequencies between 33 kHz to 40 kHz; Adjusted
by Zener Diode Fusing
•
TTL and CMOS Compatible
•
Suitable Minimum Burst Length
≥
10 Pulses/Burst
Applications
•
Audio Video Applications
•
Home Appliances
•
Remote Control Equipment
IR Receiver
ASSP
ATA2525
Preliminary
1. Description
The IC ATA2525 is a complete IR receiver for data communication that was devel-
oped and optimized for use in carrier-frequency-modulated transmission applications.
Its function can be described using the block diagram (see
Figure 1-1 on page 2).
The
input stage meets two main functions. First, it provides a suitable bias voltage for the
PIN diode. Secondly, the pulsed photo-current signals are transformed into a voltage
by a special circuit which is optimized for low-noise applications. After amplification by
a
Controlled Gain Amplifier
(CGA), the signals have to pass a tuned integrated narrow
bandpass filter with a center frequency f
0
which is equivalent to the chosen carrier fre-
quency of the input signal. The demodulator is used to convert the input burst signal
into a digital envelope output pulse and to evaluate the signal information quality, i.e.,
unwanted pulses will be suppressed at the output pin. All this is done by means of an
integrated dynamic feedback circuit which varies the gain as a function of the present
environmental condition (ambient light, modulated lamps etc.). Other special features
are used to adapt to the current application to secure best transmission quality. The
ATA2525 operates in a supply-voltage range of 4.5V to 5.5V.
Rev. 4854B–AUTO–05/05
ATA2525 [Preliminary]
3. 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.
Parameters
Supply voltage
Supply current
Input voltage
Input DC current at V
S
= 5V
Output voltage
Output current
Operating temperature
Storage temperature
Power dissipation at T
amb
= 25°C
Symbol
V
S
I
S
V
IN
I
IN
V
O
I
O
T
amb
T
stg
P
tot
Value
–0.3 to +6
3
–0.3 to V
S
0.75
–0.3 to V
S
10
–25 to +85
–40 to +125
30
Unit
V
mA
V
mA
V
mA
°C
°C
mW
4. Thermal Resistance
Parameter
Junction ambient TSSOP8
Symbol
R
thJA
Value
110
Unit
K/W
5. Electrical Characteristics
T
amb
= –25°C to +85°C, V
S
= 4.5V to 5.5V unless otherwise specified.
No.
1
1.1
1.2
2
2.1
2.2
2.3
2.4
3
3.1
3.2
Parameters
Supply
Supply-voltage range
Supply current
Output
Internal pull-up resistor
Output voltage low
Output voltage high
Output current
clamping
Input
Input DC current
Input DC current;
Figure 8-1 on page 5
V
IN
= 0; see
Figure 8-7 on page 8
V
IN
= 0; V
s
= 5V,
T
amb
= 25°C
5
5
I
IN_DCMAX
I
IN_DCMAX
–85
–530
–960
µA
µA
C
B
R
2
= 0; see
Figure 8-7 on page 8
T
amb
= 25°C; see
Figure 8-7 on page 8
I
L
= 2 mA; see
Figure 8-7 on page 8
1,3
3,6
3,1
3,6
R
PU
V
OL
V
OH
I
OCL
V
S
– 0.25
8
40
250
V
S
kΩ
mV
V
mA
A
B
B
B
I
IN
= 0
1
1
V
S
I
S
4.5
0.8
5
1.1
5.5
1.4
V
mA
C
B
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes:
1. BER = Bit Error Rate; e.g., BER = 5% means that with P = 20 at the input pin 19...21 pulses can appear at the pin OUT
2. After transformation of input current into voltage
3
4854B–AUTO–05/05
5. Electrical Characteristics (Continued)
T
amb
= –25°C to +85°C, V
S
= 4.5V to 5.5V unless otherwise specified.
No.
Parameters
Test Conditions
Test signal: see
Figure 8-6 on page 7
V
S
= 5V,
T
amb
= 25°C,
I
IN_DC
= 1 µA;
square pp,
burst N = 16,
f = f
0
; t
PER
= 10 ms,
Figure 8-6 on page 7;
BER = 50
(1)
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
3.3
Minimum detection
threshold current;
Figure 8-2 on page 5
3
I
Eemin
–520
pA
B
3.4
Test signal: see
Figure 8-6 on page 7
V
S
= 5V,
Minimum detection
T
amb
= 25°C,
threshold current with
I
= 1 µA,
AC current disturbance
IN_DC
square pp,
IIN_AC100 = 3 µA at
burst N = 16,
100 Hz
f = f
0
; t
PER
= 10 ms,
Figure 8-6 on page 7;
BER = 50%
(1)
Test signal: see
Figure 8-6 on page 7
V
S
= 5V, T
amb
= 25°C,
I
IN_DC
= 1 µA;
square pp,
burst N = 16,
f = f
0
; t
PER
= 10 ms,
Figure 8-6 on page 7;
BER = 5%
(1)
3
I
Eemin
–800
pA
C
3.5
Maximum detection
threshold current with
V
IN
> 0V
3
I
Eemax
–400
µA
D
4
4.1
4.2
4.3
4.4
4.5
4.6
Controlled Amplifier and Filter
Maximum value of
variable gain (CGA)
Minimum value of
variable gain (CGA)
Total internal
amplification
(2)
Center frequency fusing
V
S
= 5V, T
amb
= 25°C
accuracy of bandpass
Overall accuracy center
frequency of bandpass
BPF bandwidth
–3 dB; f
0
= 38 kHz; see
Figure 8-4 on page 6
G
VARMAX
G
VARMIN
G
MAX
f
0_FUSE
f
0
B
–3
–6.7
51
–5
71
f
0
f
0
3.5
+3
+4.1
dB
dB
dB
%
%
kHz
D
D
D
A
C
B
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes:
1. BER = Bit Error Rate; e.g., BER = 5% means that with P = 20 at the input pin 19...21 pulses can appear at the pin OUT
2. After transformation of input current into voltage
4
ATA2525 [Preliminary]
4854B–AUTO–05/05
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