SL6440 Plessey Semiconductors, SL6440 Datasheet - Page 4

• Manufacturer Part Number: SL6440
• Description: High Level Mixer
• Manufacturer: Plessey Semiconductors

APPLICATIONS
inputs and outputs. A balanced input will give bettercarrier
leak The high input impedanceallowsstepup transformers to
be used if desired, whilst high output impedance allows a
choice of output impedance and conversion gain.
output are single-ended and Ip is supplied from V
resistor. Increasing RL will increase the conversion gain, care
being taken to choose a suitable value for V
improved carrier leak, and balanced output for increased
conversion gain. A lower V
can be used with this arrangement.
The SL6440 can be used with differential or singleended
Fig. 2 shows the simplest application circuit. The input and
Fig. 8 shows an application with balanced input, for
Fig.5 Intermodulation v. programming current
Fig.7 Device dissipation v. I
CC
1 giving lower device dissipation
P
CC
1.
CC
1 via a
DESIGN PROCEDURE
1.
If using transformer on input, decide on ratio from noise
considerations.
2.
gain required.
3.
compression point graphs.
4.
already chosen, decide on value of V
5.
heatsink is required from maximum operating temperature
conslderatlons.
Fig.8 Typical application circuit for highest performance
Decide on input configuration using local oscillator data.
Decide on output configuration and value of conversion
Decide on value of l
Using values of conversion gain, V
Calculate device dissipation and decide whether
Fig.6 Supply current v. V
P
and V
CC
2 using intermodulation and
CC
CC
2 (I
1.
P
CC
= 0)
2, load and Ip
SL6440