KSI-W025-001 1
SL2055
PREAMPLIFIER FOR REMOTE CONTROL USE
Description
• The SL 2055 is bipolar IC for receiving preamplifier of infrared remote control system. It
consists of a head amplifier, a limiter, a band pass filter, a signal waveform detector, and a
waveform rectifier, etc.
Features
• Built-in filter enable to vary center frequency by an external resistance
(fo=30KHz to 80KHz, 38KHz typ.)
• Possible to direct connection to a photo diode.
• Open collector output(directly connectable to TTL and CMOS)
• Internal pull-up resistance and power filter resistance(low-capacitance)
• Less chances of malfunction associated with a high frequency lighting floure internal trap
circuit
Ordering Information
Type NO. Marking Package Code
SL2055 SL2055 SOP-8
Outline Dimensions unit : mm
S
Se
em
mi
ic
co
on
nd
du
uc
ct
to
or
r
KSI-W025-001 2
Maximum Ratings (Ta = 25°C)
Characteristics Symbol Rating Unit
Supply Voltage Vcc 17 V
Input Voltage VIN 5 Vp-p
Operating Temperature Tope -20 ~ 75 °C
Storage Temperature Tstg -55 ~ 150 °C
Allowable Power Dissipation Pd 270 mW
Block Diagram
PIN Description
Pin. No Symbol Pin Voltage Description
1 Vcc1 5.0 The Power Supply Voltage
2 Out 5.0 Active Low Output Terminal and an Open Collector Output
3 Vcc2 The Power Output Voltage
4 fo 1.4 Setting the Center Frequency of the Built-in BPF
5 GND - Ground
6 Cd 1.5
The Detection Capacitor for the most Output Pulse Width
Variation and Noise Reduction
7 IN- 2.5
Setting the Frequency Characteristics and Gain of the Head
Amplifier
8 IN+ 2.5 The input Signal Internal Impedance : 75KΩ (typ.)
SL2055
1
2
34
5
7
8
IN+
WAVEFORM
SHAPER
ABLC
BP F
+
TRAP
VCC2
fo
6
RS VCC1
RL
OUT
Cd
GNDIN-
HEAD
AMP LIMITER DETECTOR
KSI-W025-001 3
Electrical Characteristics(VCC=5V, Ta=25 °C)
Test Condition Tes t Rating
Item Symbol
Input Signal ON-SW Pin Min. Typ. Max.
Unit Remark
Input Pin Vol1 Vin1 1 8 2.0 2.5 3.1 V
Input Pin Vol2 Vin2 Iin=300µA 1,4,6 8 0.6 0.9 1.7 V
Output Voltage
(Low Level) VOL VP6=1V 3,5 2 - 0.2 0.4 V
Consumption
Current ICC 1,5 1 1.0 1.9 2.8 mA
Input Impedance Zin fin=38KHz,CW,
Vin=0.2VPP 1,4,8 8 45 75 125
KΩ Note1
Voltage Gain Av fin=38KHz
Vin=30µVpp 2,4,7,8 6 68 - 82 dB
BPF Bandwidth fBW
-3dB
Bandwidth
Vin=30µVPP
2,4,7,8 6 1.0 - 2.0 KHz
Detecting Ability(1) TPW1
fin=38KHz
Vin=60µVPP,
Burst Wave
1,4,7,8 2 440 540 770 µSec Note2
Detecting Ability(1) TPW2
fin=38KHz
Vin=50mVPP,
Burst Wave
1,4,7,8 2 440 660 770
µSec Note2
Note)
1.Zin =75/[(Vi/Vx)-1] Vi : Input Level, Vx : Measured Value
2.Input a Burst Wave Signal of 1.2mSec Cycle, 38kHz
SL2055
KSI-W025-001 4
Test Circuit
Application Circuit
SL2055
SL 2055
1234
5 7 86
VP6
R4 OUT
C3
47μF
SW1 SW2 SW3
SW4
SW6
SW5
SW7
SW8
VCC
5V
C9
470nF
R9
50Ω
C8
470㎋
R8
75K
IN
300μA
R7
100Ω
C7
1800pF
R6
290K
C6
0.01μF
SIGNAL
GENERATOR
130K
+
SL 2055
1 2 3 4
578 6
R4
OUT
C3
47μF
C7
1800pF
R0
0 ~ 1KΩ
C6
0.01μF
130K
POWER
SUPPLY
PHOTO
DIODE
+
SL2055
SL2055
R7
+
KSI-W025-001 5
Terminal Functions
IN + (input pin)
Connect a photodiode with pin structure between the pin8 and GND.
An ABLC (Automatic Bias Level Control)circuit is built into the input section to prevent the
input level from being saturated by the external disturbing lights, such that this circuit is
actuated by a strong external disturbing light to fix the bias level of the input terminal.
IN – (head amplifier gain setting pin)
Connect a resistor and a capacitor in series between the pin7 and GND for setting the
frequency characteristics and gain of the head amplifier.
Increasing the value of a resistor or decreasing the value of a capacitor, the gain becomes
small.
When the capacitance is large the sensitivity is lowered against the transient response.
Cd (detector capacitor connector pin)
Connect the capacitor to detect between the pin6 to GND.
When capacitance is large detected value is to the average, when it is small detected value
is closer to the peak and output pulse width became, so that the most proper output pulse
width variation and noise reduction characteristics can be obtained.
GND (ground pin)
Fo (BPF central or frequency setting pin)
Connect a resistor between the pin3 (VCC2) and the pin4
When the resistance is large, the central frequency of the built-in BPF is lowered.
VCC2 (power output pin)
As the power is output to pin3 through the internal power filter resistance, connect
An electrolytic capacitor to pin3
OUT (output pin)
Open collector output width pull-up resistance.
Its capability to drive a CMOS or TTL makes for easy connection with a receiving
microcomputer.
The SL2055 has an active low output.
VCC1 (power supply pin)
Supply voltage of 5V±10% is applied to this terminal
SL2055
KSI-W025-001 6
I/O Waveforms Description
I/O Pin Waveform Operation
Input
(Pin8)
Converts the Signal Current of Photodiode
Voltage and amplifies it.
BPF Output
(Pin6)
Suppresses the Noise Component with BPF
Output
(Pin2)
Integrates the Signal Component and make it as
Rectangular Wave Output from Comparator.
SL2055
5V
0.2V
Standard
40uV p-p to
2.5 V p-p
standard
38 KHz
600uS S ta n dard
KSI-W025-001 7
Typical Characteristics
SL2055
V cc - Supply V oltage - V
0
1
2
3
4
5
Ics - Supply Current - mA
3.5 4 4.5 5 5.5 6 6.5
Supply Current V S. Supply Voltage
90
20
30
40
50
60
70
40 80 100 120 140 160 180 20060
80
Frequency V S. Resistance(R4)
R4 = Resistance-KΩ
fc - Frequency - KHz
Vcc = 5V
90
20
30
40
50
60
70
30 35 40 45 50
80
V oltage Gain V S. Input Frequency
Iin - in pu t Frequ en c y - KHz
Av - Voltage Gain - dB
Vcc = 5V
R2 = 130KΩ
V i = 30uV p-p
10
0
100
KSI-W025-001 8
SL2055
These AUK products are intended for usage in general electronic equipments(Office and
communication equipment, measuring equipment, domestic electrification, etc.).
Please make sure that you consult with us before you use these AUK products in equipm-
ents which require high quality and/or reliability, and in equipments which could have
major impact to the welfare of human life(atomic energy control, airplane, spaceship, traffic
signal, combustion central, all types of safety device, etc.).
AUK cannot accept liability to any damage which may occur in case these AUK products
were used in the mentioned equipments without prior consultation with AUK.
