Features
•
No External Components Except PIN Diode
•
Supply-voltage Range: 4.5V to 5.5V
•
Highest Sensitivity Due to Automatic Sensitivity Adaption (AGC) and Automatic Strong
•
•
•
•
Signal Adaption (ATC)
Highest Immunity Against Disturbances from Daylight and Lamps
Available for Carrier Frequencies between 30 kHz to 76 kHz; Adjusted
by Zener Diode Fusing
TTL and CMOS Compatible
Suitable Minimum Burst Length
≥
10 Pulses/Burst
Applications
•
Home Entertainment Applications (Audio/Video)
•
Home Appliances
•
Remote Control Equipment
IR Receiver
ASSP
T2525
1. Description
The IC T2525 is a complete IR receiver for data communication that was developed
and optimized 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 T2525 is available with broadest range of carrier frequencies (30, 33, 36,
37, 38, 40, 44, 56, 76 kHz) and 5 different noise suppression regulation types (stan-
dard, lamp, noise, short burst, data rate) covering requirements of high-end remote
control solutions (please refer to selection guide available for T2525/ATA2526). The
T2525 operates in a supply voltage range of 4.5V to 5.5V.
The function of T2525 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.
4657G–AUTO–09/09
5. Electrical Characteristics
T
amb
= 25°C, V
S
= 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
(1)
Output voltage low
Output voltage high
Output current
clamping
Input
Input DC current
Input DC current;
Figure 6-2 on page 6
V
IN
= 0;
see
Figure 6-7 on page 8
V
IN
= 0; V
s
= 5V,
T
amb
= 25°C
Test signal:
see
Figure 6-6 on page 8
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 8;
BER = 50
(2)
5
5
I
IN_DCMAX
I
IN_DCMAX
–85
–530
–960
µA
µA
C
B
R
2
= 0;
see
Figure 6-7 on page 8
T
amb
= 25°C;
see
Figure 6-7 on page 8
I
L
= 2 mA;
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
30/40
250
Vs
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*
3.3
Minimum detection
threshold current;
Figure 6-1 on page 6
3
I
Eemin
–500
pA
B
3.4
Test signal:
see
Figure 6-6 on page 8
V
S
= 5V,
Minimum detection
T
amb
= 25°C,
threshold current with
= 1 µA,
I
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 8;
BER = 50%
(2)
1. Depending on version, see “Ordering Information”
3
I
Eemin
–750
pA
C
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes:
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
T2525
4657G–AUTO–09/09
T2525
5. Electrical Characteristics (Continued)
T
amb
= 25°C, V
S
= 5V unless otherwise specified.
No.
Parameters
Test Conditions
Test signal:
see
Figure 6-6 on page 8
V
S
= 5 V, 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 8;
BER = 5%
(2)
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
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
Controlled Amplifier and Filter
Maximum value of
variable gain (CGA)
Minimum value of
variable gain (CGA)
Total internal
amplification
(3)
Center frequency fusing
V
S
= 5V, T
amb
= 25°C
accuracy of bandpass
Overall accuracy center
frequency of bandpass
BPF bandwidth:
type N0 - N3
BPF bandwidth:
type N6, N7
–3 dB; f
0
= 38 kHz; see
Figure 6-4 on page 7
–3 dB; f
0
= 38 kHz
Figure 6-4 on page 7
G
VARMAX
G
VARMIN
G
MAX
f
0_FUSE
f
0
B
B
–3
–6.7
51
-5
71
f
0
f
0
3.5
5.4
+3
+4.1
dB
dB
dB
%
%
kHz
kHz
D
D
D
A
C
C
C
4.6
*) 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
5.1
ESD
All pins
⇒
2000V HBM; 200V MM, MIL-STD-883C, Method 3015.7
5.2
Reliability
Electrical qualification (1000h) in molded SO8 plastic package
5
4657G–AUTO–09/09
PCB Design
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