Features
•
No External Components Except PIN Diode
•
Supply-voltage Range: 4.5V to 5.5V
•
High Sensitivity Due to Automatic Sensitivity Adaption (AGC) and Automatic Strong
•
•
•
•
•
Signal Adaption (ATC)
High Immunity Against Disturbances from Daylight and Lamps
Small Size and Innovative Pad Layout
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
IR Receiver
ASSP
ATA2525
Applications
•
Home Entertainment Applications
•
Home Appliances
•
Remote Control Equipment
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.
The IC combines small size with high sensitivity as well as high suppression of noise
from daylight and lamps. An innovative and patented pad layout offers unique flexibil-
ity for assembly of IR receiver modules. The ATA2525 is available with standard
carrier frequencies (33, 36, 37, 38, 40 kHz) and 3 different noise suppression regula-
tion types (standard, lamp, noise) covering requirements of different high-volume
remote control solutions (please refer to selection guide available for
ATA2525/ATA2526). The ATA2525 operates in a supply voltage range of 4.5V to
5.5V.
The function of ATA2525 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 frequency 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 infor-
mation 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.
4854E–AUTO–10/06
ATA2525
2. 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
3. Thermal Resistance
Parameter
Junction ambient TSSOP8
Symbol
R
thJA
Value
110
Unit
K/W
4. 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 6-1 on page 5
V
IN
= 0; see
Figure 6-7 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
T
amb
= 25°C; see
Figure 6-7 on page 8
I
L
= 2 mA; see
Figure 6-7 on page 8
T
amb
= 25°C
R
2
= 0; see
Figure 6-7 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
A
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
4854E–AUTO–10/06
4. 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 6-6 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 6-6 on page 7;
BER = 50
(1)
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
3.3
Minimum detection
threshold current;
Figure 6-2 on page 5
3
I
Eemin
–600
pA
B
3.4
Test signal: see
Figure 6-6 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 6-6 on page 7;
BER = 50%
(1)
Test signal: see
Figure 6-6 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 6-6 on page 7;
BER = 5%
(1)
3
I
Eemin
–850
pA
C
3.5
Maximum detection
threshold current
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)
V
S
= 5V, T
amb
= 25°C
V
S
= 5V, T
amb
= 25°C
V
S
= 5V, T
amb
= 25°C
G
VARMAX
G
VARMIN
G
MAX
f
0_FUSE
f
0
–3 dB; f
0
= 38 kHz; see
Figure 6-4 on page 6
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
Center frequency fusing
V
S
= 5V, T
amb
= 25°C
accuracy of bandpass
Overall accuracy center
frequency of bandpass
BPF bandwidth
*) 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
4854E–AUTO–10/06
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