Features
•
No External Components Except PIN Diode
•
Supply-voltage Range: 2.7V to 5.5V
•
Highest Sensitivity Due to Automatic Sensitivity Adaption (AGC) and Automatic Strong
•
•
•
•
Signal Adaption (ATC)
Automatic Supply Voltage Adaptation
Highest Immunity against Disturbances from Daylight and Lamps
Available for Carrier Frequencies between 30 kHz to 76 kHz; adjusted by Zener-Diode
Fusing ±2.5%
TTL and CMOS Compatible
Applications
•
Home Entertainment Applications (Audio/Video)
•
Home Appliances
•
Remote Control Equipment
Low-voltage
IR Receiver
ASSP
T2526
1. Description
The IC T2526 is a complete IR receiver for data communication developed and opti-
mized for use in carrier-frequency-modulated transmission applications. The IC offers
highest sensitivity as well as highest suppression of noise from daylight and lamps.
The T2526 is available with broadest range of frequencies (30, 33, 36, 37, 38, 40, 44,
56, 76 kHz) and 5 different noise suppression regulation types (standard, lamp, noise,
short burst, data rate) covering requirements of high-end remote control solutions
(please refer to selection guide available for T2525/T2526). The T2526 operates in a
supply voltage range of 2.7V to 5.5V.
The function of the T2526 can be described using the block diagram of
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 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. All 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 special features are used to adapt to the current application to secure best
transmission quality.
4597G–AUTO–10/06
5. Electrical Characteristics, 3-V Operation
T
amb
= 25°C, V
S
= 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
(1)
Output voltage low
Output voltage high
Output current clamping
Input
Input DC current
V
IN
= 0
See
Figure 7-10 on page 10
5
5
I
IN_DCMAX
I
IN_DCMAX
I
Eemin
–150
–350
µA
µA
C
B
R
2
= 0
See
Figure 7-10 on page 10
T
amb
= 25°C
See
Figure 7-10 on page 10
R
2
= 2.4 kΩ
See
Figure 7-10 on page 10
1, 3
3, 6
3, 1
3, 6
R
PU
V
OL
V
OH
I
OCL
V
S
– 0.25
8
30/40
250
Vs
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; Vs = 3V
See
Figure 7-3 on page 7
T
amb
= 25°C
Minimum detection
Test signal:
threshold current
See
Figure 7-9 on page 10
See
Figure 7-1 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 7-8 on page 9
3 µA at 100 Hz
BER = 50
(2)
Test signal:
See
Figure 7-9 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 7-8 on page 9
BER = 5%
(2)
3.3
3
–700
pA
B
3.4
3
I
Eemin
–1300
pA
C
3.5
Maximum detection
threshold current with
V
IN
> 0V
3
I
Eemax
–200
µA
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
4597G–AUTO–10/06
T2526
5. Electrical Characteristics, 3-V Operation (Continued)
T
amb
= 25°C, V
S
= 3V unless otherwise specified.
No.
4
4.1
4.2
4.3
4.4
4.5
4.6
4.7
Parameters
Maximum value of
variable gain (CGA)
Minimum value of variable
gain (CGA)
Total internal
amplification
(3)
Center frequency fusing
accuracy of bandpass
Overall accuracy center
frequency of bandpass
Overall accuracy center
frequency of bandpass
BPF bandwidth
T
amb
= 0 to 70°C
–3 dB; f
0
= 38 kHz;
See
Figure 7-7 on page 9
V
S
= 3V, T
amb
= 25°C
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
Controlled Amplifier and Filter
G
VARMAX
G
VARMIN
G
MAX
f
03V_FUSE
f
03V
f
03V
B
–2.5
–5.5
–4.5
51
-5
71
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
*) 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
6. Electrical Characteristics, 5-V Operation
T
amb
= 25°C, V
S
= 5V unless otherwise specified.
No.
5
5.1
5.2
6
6.1
6.2
6.3
6.4
Parameters
Supply
Supply-voltage range
Supply current
Output
Internal pull-up
resistor
(1)
Output voltage low
Output voltage high
Output current
clamping
R
2
= 0
See
Figure 7-10 on page 10
T
amb
= 25°C
See
Figure 7-10 on page 10
R
2
= 2.4 kΩ
See
Figure 7-10 on page 10
1, 3
3, 6
3, 1
3, 6
R
PU
V
OL
V
OH
I
OCL
V
S
– 0.25
8
30/40
250
Vs
kΩ
mV
V
mA
A
B
B
B
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*
*) 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
4597G–AUTO–10/06
Embedded System
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