Features
•
No External Components Except PIN Diode
•
Supply-voltage Range: 2.7V to 5.5V
•
High Sensitivity Due to Automatic Sensitivity Adaption (AGC) and Automatic Strong
•
•
•
•
•
Signal Adaption (ATC)
Automatic Supply Voltage Adaptation
High Immunity against Disturbances from Daylight and Lamps
Small Size and Innovative Pad Layout
Available for Carrier Frequencies between 33 kHz to 40 kHz and 56 kHz; Adjusted by
Zener Diode Fusing ±2.5%
TTL and CMOS Compatible
Applications
•
Home Entertainment Applications
•
Home Appliances
•
Remote Control Equipment
Low-voltage
IR Receiver
ASSP
ATA2526
1. Description
The IC ATA2526 is a complete IR receiver for data communication that has been
developed and optimized for use in carrier-frequency-modulated transmission applica-
tions. The IC combines small size with high sensitivity suppression of noise as caused
by daylight and lamps. An innovative and patented pad layout offers unique flexibility
for IR receiver module assembly. The ATA2526 is available with standard frequencies
(33, 36, 37, 38, 40, 56 kHz) and 3 different noise suppression regulation types (stan-
dard, lamp, short burst), thus covering the requirements of different high-volume
remote control solutions (please refer to selection guide available for
ATA2525/ATA2526). The ATA2526 operates in a supply voltage range of 2.7V to
5.5V.
The function of the ATA2526 can be described using the block diagram of
Figure 1-1
on page 2.
The input stage has 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 first to convert
the input burst signal to a digital envelope output pulse and to evaluate the signal
information quality, i.e., unwanted pulses will be suppressed at the output pin. This is
done by means of an integrated dynamic feedback circuit which varies the gain as a
function of the present environmental conditions (ambient light, modulated lamps
etc.). Other features can be used to adapt the device to the individual application to
ensure best transmission quality.
4905E–AUTO–09/09
Figure 1-1.
Block Diagram
VS
IN
Input
CGA and
filter
OUT
Demodulator
Micro-
controller
Oscillator
Carrier frequency f
0
AGC/ATC and digital
control
ATA2526
Modulated IR signal
min 6 or 10 pulses
GND
2
ATA2526
4905E–AUTO–09/09
ATA2526
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.
Parameter
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
Parameters
Junction ambient TSSOP8
Symbol
R
thJA
Value
110
Unit
K/W
4. Electrical Characteristics, 3-V Operation
T
amb
= –25°C to +85°C, V
S
= 2.7V to 3.3V 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
V
IN
= 0
See
Figure 6-10 on page 10
5
5
I
IN_DCMAX
I
IN_DCMAX
–150
–350
µA
µA
C
B
R
2
= 0
See
Figure 6-10 on page 10
T
amb
= 25°C
See
Figure 6-10 on page 10
R
2
= 1.4 kΩ
See
Figure 6-10 on page 10
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
2.7
0.7
3.0
0.9
3.3
1.3
V
mA
C
B
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
Input DC current
V
IN
= 0; V
S
= 3V
See
Figure 6-3 on page 7
T
amb
= 25°C
*) 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
4905E–AUTO–09/09
4. Electrical Characteristics, 3-V Operation (Continued)
T
amb
= –25°C to +85°C, V
S
= 2.7V to 3.3V unless otherwise specified.
No.
3.3
Parameters
Test Conditions
Pin
3
Symbol
I
Eemin
Min.
Typ.
–800
Max.
Unit
pA
Type*
B
Minimum detection
Test signal:
threshold current
See
Figure 6-9 on page 10
See
Figure 6-1 on page 7
V
S
= 3V
T
amb
= 25°C, I
IN_DC
=1 µA
Minimum detection
square pp
threshold current with AC burst N = 16
current disturbance
f = f
0
; t
PER
= 10 ms
IIN_AC100 =
Figure 6-8 on page 9
3 µA at 100 Hz
BER = 50
(1)
Test signal:
See
Figure 6-9 on page 10
V
S
= 3V, T
amb
= 25°C
I
IN_DC
= 1 µA
square pp
burst N = 16
f = f
0
; t
PER
= 10 ms
Figure 6-8 on page 9
BER = 5%
(1)
3.4
3
I
Eemin
–1600
pA
C
3.5
Maximum detection
threshold current with
V
IN
> 0V
3
I
Eemax
–200
µA
D
4
4.1
4.2
4.3
4.4
4.5
4.6
4.7
Controlled Amplifier and Filter
Maximum value of
variable gain (CGA)
V
S
= 3V, T
amb
= 25°C
G
VARMAX
G
VARMIN
G
MAX
f
03V_FUSE
f
03V
T
amb
= 0 to 70°C
–3 dB; f
0
= 38 kHz;
See
Figure 6-7 on page 9
f
03V
B
–2.5
–5.5
–4.5
50
–6
72
f
0
f
0
f
0
3.8
+2.5
+3.5
+3.0
dB
dB
dB
%
%
%
kHz
D
D
D
A
C
C
C
Minimum value of variable
V
S
= 3V, T
amb
= 25°C
gain (CGA)
Total internal
amplification
(2)
Center frequency fusing
accuracy of bandpass
Overall accuracy center
frequency of bandpass
Overall accuracy center
frequency of bandpass
BPF bandwidth
V
S
= 3V, T
amb
= 25°C
V
S
= 3V, T
amb
= 25°C
*) 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
ATA2526
4905E–AUTO–09/09
ATA2526
5. Electrical Characteristics, 5-V Operation
T
amb
= –25°C to +85°C, V
S
= 4.5V to 5.5V unless otherwise specified.
No.
5
5.1
5.2
6
6.1
Parameters
Supply
Supply-voltage range
Supply current
Output
Internal pull-up resistor
T
amb
= 25°C
See
Figure 6-10 on page
10
R
2
= 2.4 kΩ
See
Figure 6-10 on page
10
R
2
= 0
See
Figure 6-10 on page
10
V
IN
= 0
See
Figure 6-10 on page
10
1, 3
R
PU
40
kΩ
A
I
IN
=0
1
1
V
S
I
S
4.5
0.9
5.0
1.2
5.5
1.6
V
mA
C
B
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
6.2
6.3
6.4
7
7.1
Output voltage low
Output voltage high
Output current clamping
Input
Input DC current
3, 6
3, 1
3, 6
V
OL
V
OH
I
OCL
V
S
– 0.25
8
250
V
S
mV
V
mA
B
B
B
5
I
IN_DCMAX
I
IN_DCMAX
I
Eemin
–400
µA
C
7.2
Input DC current
V
IN
= 0; V
S
= 5V
See
Figure 6-4 on page 8
T
amb
= 25°C
Minimum detection
Test signal:
threshold current
See
Figure 6-9 on page
See
Figure 6-2 on page 7 10
V
S
= 5V
T
amb
= 25°C
Minimum detection
I
IN_DC
= 1 µA
threshold current with AC square pp
current disturbance
burst N = 16
IIN_AC100 = 3 µA at
f = f
0
; t
PER
= 10 ms
100 Hz
Figure 6-8 on page 9
BER = 50
(1)
Test signal:
See
Figure 6-9 on page
10
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 6-8 on page 9
BER = 5%
(1)
5
–700
µA
B
7.3
3
–1000
pA
B
7.4
3
I
Eemin
–2500
pA
C
7.5
Maximum detection
threshold current with
V
IN
> 0V
3
I
Eemax
–500
µA
D
*) 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
5
4905E–AUTO–09/09
