Rev. 4597CAUTO11/03
Features
No External Components Except PIN Diode
Supply-voltage Range: 2.7 V to 5.5 V
Automatic Sensitivity Adaptation (AGC)
Automatic Strong Signal Adaptation (ATC)
Automatic Supply Voltage Adaptation
Enhanced Immunity against Ambient Light Disturbances
Available for Carrier Frequencies between 30 kHz to 76 kHz; adjusted by Zener-Diode
Fusing 2.5%
TTL and CMOS Compatible
Applications
Audio Video Applications
Home Appliances
Remote Control Equipment
Description
The IC T2526 is a complete IR receiver for data communication developed and opti-
mized for use in carrier-frequency-modulated transmission applications. Its function
can be described using the block diagram of Figure 1. 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 Ampli-
fier (CGA) the signals have to pass a tuned integrated narrow bandpass filter with a
center frequency f
0
which is equivalent to the choosen carrier frequency of the input
signal The demodulator is used first to convert the input burst signal to a digital enve-
lope 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 enviromen-
tal conditions (ambient light, modulated lamps etc.). Other special features are used to
adapt to the current application to secure best transmission quality. The T2526 oper-
ates in a supply-voltage range from 2.7 V to 5.5 V. By default, the T2526 is optimized
for best performance within 2.7 V to 3.3 V.
Figure 1. Block Diagram
Input
CGA and
filter
Demo-
dulator
Oscillator
AGC/ATC
and digital control
VS
Modulated IR signal
min 6 or 10 pulses
GND
IN
OUT
T2526
Micro-
controller
Carrier frequency f
0
Low-voltage
IR Receiver
ASSP
T2526
2
T2526
4597CAUTO11/03
Pin Configuration
Figure 2. Pinning SO8 and TSSOP8
1
2
3
4
8
7
6
5
VS
NC
OUT
NC
NC
NC
GND
IN
Pin Description
Pin
Symbol
Function
1
VS
Supply voltage
2
NC
Not connected
3
OUT
Data output
4
NC
Not connected
5
IN
Input PIN-diode
6
GND
Ground
7
NC
Not connected
8
NC
Not connected
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
Symbol
Value
Unit
Supply voltage
V
S
-0.3 to 6
V
Supply current
I
S
3
mA
Input voltage
V
IN
-0.3 to V
S
V
Input DC current at V
S
= 5 V
I
IN
0.75
mA
Output voltage
V
O
-0.3 to V
S
V
Output current
I
O
10
mA
Operating temperature
T
amb
-25 to +85
C
Storage temperature
T
stg
-40 to +125
C
Power dissipation at T
amb
= 25
C
P
tot
30
mW
3
T2526
4597CAUTO11/03
Thermal Resistance
Parameter
Symbol
Value
Unit
Junction ambient SO8
R
thJA
130
k/W
Junction ambient TSSOP8
R
thJA
tbd
K/W
Electrical Characteristics, 3-V Operation
T
amb
= 25C, V
S
= 3 V unless otherwise specified.
No.
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
1
Supply
1.1
Supply-voltage range
1
V
S
2.7
3.0
3.3
V
C
1
.
2
Supply current
I
IN
=0
1
I
S
0.7
0.9
1.3
mA
B
2
Output
2.1
Internal pull-up resistor
(1)
T
amb
= 25
C
See Figure 12 on page 9
1, 3
R
PU
30/40
k
W
A
2.2
Output voltage low
R
2
= 2.4 k
W
See
Figure 12 on page 9
3, 6
V
OL
250
mV
B
2.3
Output voltage high
3, 1
V
OH
V
S
- 0.25
Vs
V
B
2.4
Output current clamping
R
2
= 0
See Figure 12 on page 9
3, 6
I
OCL
8
mA
B
3
Input
3.1
Input DC current
V
IN
= 0
See Figure 12 on page 9
5
I
IN_DCMAX
-150
A
C
3.2
Input DC current
See Figure 5 on page 6
V
IN
= 0; Vs = 3 V
T
amb
= 25C
5
I
IN_DCMAX
-350
A
B
3.3
Minimum detection
threshold current
See Figure 3 on page 6
Test signal:
See Figure 11 on page 9
V
S
= 3 V
T
amb
= 25C, I
IN_DC
=1A
square pp
burst N=16
f = f
0
; t
PER
= 10 ms
Figure 10 on page 8
BER = 50
(2)
3
I
Eemin
-700
pA
B
3.4
Minimum detection
threshold current with AC
current disturbance
IIN_AC100 =
3
A at 100 Hz
3
I
Eemin
-1500
pA
C
3.5
Maximum detection
threshold current with
V
IN
> 0V
Test signal:
See Figure 11 on page 9
V
S
= 3 V, T
amb
= 25C
I
IN_DC
= 1 A
square pp
burst N = 16
f = f
0
; t
PER
= 10 ms
Figure 10 on page 8
BER = 5%
(2)
3
I
Eemax
-200
A
D
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes:
1. Depending on version, see "Ordering Information"
2. 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
3. After transformation of input current into voltage
4
T2526
4597CAUTO11/03
4
Controlled Amplifier and Filter
4.1
Maximum value of
variable gain (CGA)
G
VARMAX
51
dB
D
4.2
Minimum value of variable
gain (CGA)
G
VARMIN
-5
dB
D
4.3
Total internal
amplification
(3)
G
MAX
71
dB
D
4.4
Center frequency fusing
accuracy of bandpass
V
S
= 3 V, T
amb
= 25
C f
03V_FUSE
-2.5
f
0
+2.5
%
A
4.5
Overall accuracy center
frequency of bandpass
f
03V
-5.5
f
0
+3.5
%
C
4.6
Overall accuracy center
frequency of bandpass
T
amb
= 0 to 70
C
f
03V
-4.5
f
0
+3.0
%
C
4.7
BPF bandwidth
-3 dB; f
0
= 38 kHz;
See Figure 9 on page 8
B
3.8
kHz
C
Electrical Characteristics, 3-V Operation (Continued)
T
amb
= 25C, V
S
= 3 V unless otherwise specified.
No.
Parameters
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. Depending on version, see "Ordering Information"
2. 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
3. After transformation of input current into voltage
Electrical Characteristics, 5-V Operation
T
amb
= 25
C, V
S
= 5
V unless otherwise specified.
No.
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
5
Supply
5.1
Supply-voltage range
1
V
S
4.5
5.0
5.5
V
C
5
.
2
Supply current
I
IN
=0
1
I
S
0.9
1.2
1.6
mA
B
6
Output
6.1
Internal pull-up resistor
(1)
T
amb
= 25
C
See Figure 12 on page 9
1, 3
R
PU
30/40
k
W
A
6.2
Output voltage low
R
2
= 2.4 k
W
See Figure 12 on page 9
3, 6
V
OL
250
mV
B
6.3
Output voltage high
3, 1
V
OH
V
S
- 0.25
Vs
V
B
6.4
Output current clamping
R
2
= 0
See Figure 12 on page 9
3, 6
I
OCL
8
mA
B
7
Input
7.1
Input DC current
V
IN
= 0
See Figure 12 on page 9
5
I
IN_DCMAX
-400
A
C
7.2
Input DC-current
See Figure 6 on page 7
V
IN
= 0; Vs = 5 V
T
amb
= 25
C
5
I
IN_DCMAX
-700
A
B
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes:
1. Depending on version, see "Ordering Information"
2. 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
3. After transformation of input current into voltage
5
T2526
4597CAUTO11/03
ESD
All pins
2000V HBM; 200V MM, MIL-STD-883C, Method 3015.7
Reliability
Electrical qualification (1000h) in molded SO8 plastic package
7.3
Min. detection threshold
current
See Figure 4 on page 6
Test signal:
See Figure 11 on page 9
V
S
= 5 V
T
amb
= 25
C
I
IN_DC
= 1A
square pp
burst N = 16
f = f
0
; t
PER
= 10 ms
Figure 10 on page 8
BER = 50
(2)
3
I
Eemin
-890
pA
B
7.4
Min. detection threshold
current with AC current
disturbance IIN_AC100 =
3
A at 100 Hz
3
I
Eemin
-2500
pA
C
7.5
Max. detection threshold
current with V
IN
> 0V
Test signal:
See Figure 11 on page 9
V
S
= 5 V, T
amb
= 25
C
I
IN_DC
= 1A
square pp
burst N = 16
f = f
0
; t
PER
= 10 ms
Figure 10 on page 8
BER = 5%
(2)
3
I
Eemax
-500
A
D
8
Controlled Amplifier and Filter
8.1
Maximum value of
variable gain (CGA)
G
VARMAX
51
dB
D
8.2
Minimum value of variable
gain (CGA)
G
VARMIN
-5
dB
D
8.3
Total internal
amplification
(3)
G
MAX
71
dB
D
8.4
Resulting center
frequency fusing
accuracy
f
0
fused at V
S
= 3 V
V
S
= 5 V, T
amb
= 25
C
f
05V
f
03V-FUSE
+ 0.5
%
A
Electrical Characteristics, 5-V Operation (Continued)
T
amb
= 25
C, V
S
= 5
V unless otherwise specified.
No.
Parameters
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. Depending on version, see "Ordering Information"
2. 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
3. After transformation of input current into voltage
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