Obsolescence Notice
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ADVANCE INFORMATION
DS3630 - 1.1
SL610, SL611 & SL612
RF/IF AMPLIFIER
The SL610C, SL611C and SL612C are RF voltage
amplifier with AGC facilities. The voltage gain is 10, 20 and
50 times respectively and the upper frequency response
varies from 15MHz to 120MHz according to type .
FEATURES
Wide AGC Range: 50dB
Easy Interfacing
Integral Power Supply RF Decoupling
CM8
Fig.1 Pin connections (top view)
APPLICATIONS
RF Amplifiers
IF Amplifiers
ABSOLUTE MAXIMUM RATINGS
Supply voltage:
Storage temperature:
Operating temperature range
Chip-to-ambient
Chip-to-case
12V
-65°C to +150°C
-30°C to +85°C
225°C/W
65°C/W
QUICK REFERENCE DATA
Supply Voltage: 6V
Voltage Gain: 20dB to 34dB
ORDERING INFORMATION
SL610/1/2 C CM
SL610 NA 1C
SL612 NA 1C
VCC
AGC
7
2
INPUT
5
3
OUTPUT
6
INPUT
BIAS
4
8
Fig.2 Block diagram
Fig.3 Input admittance with o/c output (G
11
)
SL610/611 & 612
ELECTRICAL CHARACTERISTICS
These characteristics are guaranteed over the following conditions (unless otherwise stated)
Supply voltage VCC: 6V
Ambient temperature: 22°C
±
2°C
Test frequency: SL610C 30MHz
SL611C 30MHz
SL612C 1.75MHz
Value
Characteristics
Supply current
Circuit
SL610C
SL611C
SL612C
SL610C
SL611C
SL612C
SL610C
SL611C
SL612C
Min.
Typ.
15
15
3.3
20
26
34
120
80
15
1.0
Max.
20
20
5
22
28
36
Units
mA
mA
mA
dB
dB
dB
MHz
MHz
MHz
V rms
Conditions
No signal, Pin 3 open circuit
R
S
= 50Ω
R
L
= 22°C
T
amb
= 22°C
Voltage gain
Cut-off frequency (-3dB)
18
24
32
85
50
10
Max. output signal (max. AGC)
Max.input signal (max. AGC)
AGC range
SL610C
SL611C
SL612C
AGC current
40
40
60
RL = 150Ω (SL610C/611C)
RL = 1.2kΩ (SL612C)
250
50
50
70
0.15
0.6
mV rms
dB
dB
dB
mA
Pin 7 0V to 5.1V
Current into pin 7 at 5.1V
APPLICATION NOTES
Input circuit
The SL610C, SL611C and SL612C are normally used with
pins 5 and 6 connected together and with the input connected
via a capacitor as shown in Fig.2.
The input impedance is negative between 30MHz and
100MHz (SL610C, SL611C only) and is shown in Fig.3. The
source and inductive is should be shunted by a 1kΩ resistor to
prevent oscillation.
An alternative circuit with improved noise figure is shown in
Fig.4.
AGC
When pin 7 is open circuit or connected to a voltage less
than 2V the voltage gain is normal. As the AGC voltage is
increased there is a reduction in gain as shown in Fig.6. This
reduction varies with temperature.
5
3
6
4
8
Fig.4 Alternative input circuit
Output circuit
The output stage is an emitter follower and has a negative
output impedance at certain frequencies as shown in Fig.5.
To prevent oscillation when the load is capacitive a 47Ω
resistor should be conncted in series with the output.
Fig.5 Typical output impedance with s/c input (G22)
SL610/611 & 612
Typical applications
The circuit of Fig.7 is a general purpose RF preamplifier.
The voltage gain (from pin 5 to pin 3) is shown in Fig.8.
Fig.9 is the IF section of a simple SSB transceiver. At 9MHz
it has a gain of 100dB.
+6V
0.1µ
RI
47
OUTPUT
0.01µ
5
6
2
3
8
7
4
INPUT
0.01µ
Fig.6 AGC characteristics (typical)
Fig.7 RF preamplifier
Fig.8 Typical voltage gain (RS = 50
Ω
)
Fig.9 IF amplifier using SL1612
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