Contents
Features ..................................................................1
Applications .............................................................1
Functions.................................................................1
Block Diagram .........................................................1
Terminals.................................................................2
Absolute Maximum Ratings (Ta=25
°C)..................3
Recommended Operating Conditions......................3
Electrical Characteristics (Ta=25 °C, VDD=3.0 V) ...4
Electrical Characteristic Curves ...............................4
RECEIVER IC FOR INFRARED REMOTE CONTROLLER
S-8270A
The S-8270A is a CMOS IC developed for infrared remote control
System. A photodetecting PIN diode can be directly connected. An
input amplifier, limiter amplifier,band-pass filter, detector and an output
waveform shaper are contained in a one-chip.
n
Features
Characteristics
•
Power supply voltage : 2. 4 to 6. 0 V (I
IN
=30
µ
A)
•
Current consumption: 0.13 mA typ. 0. 25 mA max. at 3. 0 V
Hardware functions
•
Incorporates band-pass filter
(possible to adjust resonance frequency by
external resistance: f0=30 to 46KHz)
•
Incorporates trap filter
Possible to connect input terminal directly to
photodetecting PIN diode
•
Output logic is active “LOW”
•
Output is generated N-channel open drain with pull-up
resistor (Possible to connect output terminal directly to
TTL or CMOS)
Package
•
8-pin SOP: S-8270AFE
•
8-pin DIP : S-8270ADP
n
Applications
•
Infrared remote control encoder for
TVs, VCRs, audio devices
•
Infrared remote control TOYs
n
Functions
The S-8270A amplifies the voltage converted from the current signal of the PIN diode , which is coupled directly to S-
8270A, at the reception of the infrared.
The signal, then, goes through the band-pass filter for noise reduction before being input to the discriminator. The
discriminator recovers the transmitted data out of a burst signal. Finally the data are shaped by the signal shaping
circuit.
n
Block diagram
VDD
IN
AMP
LIMI
B.P.F.
+
TRAP
DETECTOR
RE-SHAPER
DOU
ABLC
CG
F0
CD
GND
Figure 1
Seiko Instruments Inc.
1
RECEIVER IC FOR INFRARED REMOTE CONTROLLER
S-8270A
n
Terminals
1.Pin assignment (Top view)
8-pin SOP
NC
IN
CG
GND
1
2
3
4
8
7
6
5
VDD
DOUT
CD
F0
NC
IN
CG
GND
1
2
3
4
8-pin DIP
8
7
6
5
VDD
DOUT
CD
F0
Figure 2
2.Dimensions
8-Pin SOP
5.2 (5.5 max.)
8
5
0.4
4.4
6.2±0.3
1
4
1.5±0.1
0 min.
1.7 max.
0.15
+0.1
−0.05
1.27 0.4±0.1
Unit : mm
Figure 3
8-Pin DIP
9.3 (9.6 max.)
8
5
6.5
1
1.0
4
1.5
3.4±0.1 4.5 max.
0.4 min. 3.1 min.
7.62
2.54
0.5±0.1
+0.1
0.3
−0.05
0 to 15
Unit : mm
Figure 4
2
Seiko Instruments Inc.
RECEIVER IC FOR INFRARED REMOTE CONTROLLER
S-8270A
3. Terminal Description
Table 1
Terminal
No.
1
2
Symbol
NC
IN
External parts
Description
•
No connection
•
Input terminal which connects photodetecting PIN diode.
•
Internal impedance is 50 kΩ typ. Therefore a photodetecting
PIN diode can be directly connected.
•
ABLC (Automatic Bias Level Control) prevent from satulation
of input level
•
Input terminal which connects condenser to AMP gain control.
•
•E GND potential terminal.
•
Input terminal which connects resistance to adjust resonance
frequency of band-pass filter (f0=30 to 46KHZ)
•
TRAP AMP. prevent from illigal action which is caused by
high frequency noise of fluore scent lamp.
•
Input terminal which connects condenser to adjust detector
circuit.
•
Output terminal which output logic is active “LOW”.
•
Output is generated at N-channel open drain with pull-up
resistor, which is easily interfaced to next stage circuit.
•
Positive power supply
Photodetecting PIN diode
3
4
5
CG
VSS
F0
1500pF to 0.01µF
24K
Ω
6
7
CD
DOUT
200pF
8
VDD
n
Absolute Maximum Ratings (Ta=25
°
C)
Table 2
Item
Storage temperature
Operating ambient temperature
Power supply voltage
Input voltage
Output voltage
Power dissipation
Symbol
Tstg
Topr
V
DD
V
IN
V
OUT
Pd
Rating
-40 to +125
-30 to +85
-0.3 to +7.0
0 to V
DD
0 to V
DD
200
Unit
C
C
V
V
V
mW
n
Recommended Operating Conditions
Table 3
Item
Power supply voltage
Input frequency
Condenser for AMP gain control
Resistor to sdjust resonance
frequency of band-pass filter
Condenser to adjust detector
circuit
Symbol
V
DD
f
in
CG
F0
CD
Conditions
I
IN
=30
µA
I
IN
=300
µA
Min.
2.4
2.7
30
2000
24
200
Typ.
Max.
6.0
6.0
46
Unit
V
V
KHz
pF
KΩ
pF
f
IN
=38 KHz
Seiko Instruments Inc.
3
RECEIVER IC FOR INFRARED REMOTE CONTROLLER
S-8270A
n
Electrical Characteristics (Ta=25
°C,
V
DD
=3.0 V)
Table 4
Item
Operating current consumption
AMP gain
Resonance frequency
of band-pass filter
Band width of band-pass filter
Output pulse width
Low level output voltage
High level output current
Input resistance
Input voltage 1
Input voltage 2
Output pull-up resistance
(*1) V
IN
is input voltage
(*2) Input (burst wave)
Symbol
I
DD
AV
f0
fBW
tpw
V
OL
I
OH
RIN
V
IN1
V
IN2
R
OUT
Conditions
V
IN
=V
SS
fin=38 KH
Z
V
IN
=30
µVp-p
(*1)
V
IN
=300
µVp-p
(*1)
-3dB band width
f0=38 KHz
fin=38 KHz BW
V
IN
=50 mVp-p (*2)
I
OL
=0.1 mA
V
OH
=V
DD
I
IN
=300
µA
(*3)
I
IN
=0
µA
I
IN
=300
µA
V
DD
=3.0V
Min.
Typ.
0.13
80
38
2.5
Max.
0.25
83
Unit
mA
dB
KHz
KHz
µS
V
µA
KΩ
V
V
KΩ
77
2.0
440
3.0
770
0.4
1
70
50
0
1.2
100
0.5
50
-1
30
1.8
200
600
µS
Output wave
600
µS
38 KHz
tpw
(*3) V
IN
: Input voltage, Vr : Measurement voltage
RIN=
50
V
IN
/Vr-1
[KΩ]
n
Electrical Characteristic Curves
(1) Voltage Gain - Frequency
1000
<CONDITIONS>
f
IN
=38 KHz
V
IN
=100
µVp-p
V
DD
=3.0 V
Ta=25
°C
GAIN
[dB]
(2)AMP Gain - External Condenser
0
-1
-2
-3
-4
<CONDITIONS>
V
DD
=3.0 V
Ta=25
°C
100
CD
[mV]
10
1
-5
-6
1000P
10K
FREQUENCY [Hz]
100K
0.01µ
CG [F]
0.1µ
0.1
4
Seiko Instruments Inc.
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