SL6440
HIGH LEVEL MIXER
The SL6440 is a double balanced mixer intended for use in
radio systems up to 150MHz. A special feature of the circuit
allows external selection of the DC operating conditions by
means of a resistor connected between pin 11 (bias) and Vcc
When biased for a supply current of 50mA the SL6440 offers
a 3rd order intermodulation intercept point of typically
+30dBm, a value previously unobtainable with integrated
circuits. This makes the device suitable for many applications
where diode ring mixers had previously been used and offers
the advantages of a voltage gain, low local oscillator drive
requirement and superior isolation.
FEATURES
s +30dBm Input Intercept Point
s +15dBm Compression Point (1dB)
s Programmable Performance
s Full Military Temperature Range (SL644A)
APPLICATIONS
s Mixers in Radio Transceivers
s Phase Comparators
s Modulators
ORDERING INFORMATION
SL6440 A DG
SL6440 C DP
Fig.1 Pin connections - top view
DG16
DP16
ABSOLUTE MAXIMUM RATINGS
Supply voltage and output pins
Maximum power dissipation
(Derate above 25°C: 8mW/°C)
Storage temperature range
Programming current into pin 11
15V
1200mW
-65°C to +150°C
50mA
THERMAL CHARACTERISTICS
Thermal resistance: 0JA
0JC
Time constant: Junction-Ambient
Maximum chip temperature
125°C/W
1.9 mins
150°C
ELECTRICAL CHARACTERISTICS
Test condltions (unless otherwise stated):
VCC1 = 12V; VCC2 = 10V; IP = 25mA; Tamb = -55°C to +125°C (SL64440A), -30°C to +85°C (SL6440C)
Local oscillator input level = 0dBm; Test circuit Fig.2.
Characteristic
Value
Min. Typ.
Max.
Units
Conditions
Signal frequency 3dB point
100 150
Oscillator frequency 3dB point
100 150
3rd order input intercept point
+30
Third order intermodulation distortion
-60
Second order intermodulation distortion
-75
1dB compression point
15
Noise figure
11
Conversion gain
-1
Carrier leak to signal input
-40
Level of carrier at IF output
-25
Supply current
7
Supply current (total from VCC1 & VCC2)
60
Local oscillator input
100 250 500
Local oscillator input impedance
1.5
Signal input impedance
500
1000
MHz
MHz
dBm
dB
dB
dBm
dB
dB
dB
dBm
mA
mA
mV rms
kΩ
Ω
Ω
Two 0dBm input
Signals
VCC1 = 15V VCC2 = 12V
VCC1 = 12V VCC2 = 10V
Fig.8 test circuit
50Ω load Fig.2
Test circuit Fig.8
See applications information
IP = 0
IP = 35mA
Single ended
Differential
NOTE Supply current in Pin 3 is equal to that in Pin 14 and is equal to IP See over. Vpin11 3Vbe 2.1V.