MA4AGSW8-1 Datasheet, PDF (4/6 Pages) Tyco Electronics – AlGaAs SP8T PIN Diode Series Switch

MA4AGSW8-1
SP8T AlGaAs PIN Diode Switch
RoHS Compliant
Rev. V2
Operation of the MA4AGSW8-1 Switch
The application of either a +15 mA or -15 mA DC bias current to the selected output port will provide the low
insertion loss state. Typically this low loss, “ON” bias voltage through (3) series diodes is 4.5 Volts maximum. All
isolated ports are set to 0V at 0 mA, or, to improve switching speed and isolation, a back bias of 5V/0 mA may also
be applied. RF to DC bias networks are required on all RF ports. To switch the individual RF ports on and off, a
simple single +5V, PIN diode supply, with a TTL gate driver can be used to supply current for the low loss state or
0 V back bias for isolation . In this bias scheme, +5V through a current limiting resistor would be applied at the
common port, J1 and each RF port would be connected to a TTL gate. Low loss would occur when the selected
gate voltage, TTL0, at the output port is 5V/+15 mA and isolation would occur when the selected gate
voltage,TTL1, is -5V/0mA. For faster switching speeds,< 20 nS, a ± 5V ,PIN diode TTL driver should be employed
to help remove the diode stored charge with back bias.
MA4AGSW8-1 Schematic and Driver Bias Connections
TYPICAL DRIVER CONNECTIONS
Input Port
J1
J1
J1
J1
J1
J1
J1
J1
Output Ports
-15mA @ J2 -15mA @ J3 -15mA @ J4 -15mA @ J5 -15 mA @ J6 -15mA @ J7 -15mA @ J8 -15mA @ J9
Low Loss Isolation Isolation Isolation
Isolation
Isolation Isolation Isolation
Isolation Low Loss Isolation Isolation
Isolation
Isolation Isolation Isolation
Isolation Isolation Low Loss Isolation
Isolation
Isolation Isolation Isolation
Isolation Isolation Isolation Low Loss Isolation
Isolation Isolation Isolation
Isolation Isolation Isolation Isolation Low Loss Isolation Isolation Isolation
Isolation Isolation Isolation Isolation
Isolation Low Loss Isolation Isolation
Isolation Isolation Isolation Isolation
Isolation
Isolation Low Loss Isolation
Isolation Isolation Isolation Isolation
Isolation
Isolation Isolation Low Loss
Notes:
Low Loss = -15mA applied at the specified Output Port. (A dc ground return at port J1 must be provided)
Isolation = 0 Volts applied at the specified Output Ports.
4
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