TA32305EVKIT-433 Toshiba, TA32305EVKIT-433 Datasheet - Page 11

• Manufacturer Part Number: TA32305EVKIT-433
• Description: KIT EVALUATION 433MHZ TA32305
• Manufacturer: Toshiba
• Type: Transceiverr

Specifications of TA32305EVKIT-433

• Contents: 2 Transceiver Modules, 2 Antennas and CD-ROM
• For Use With/related Products: TA32305 Transceiver Module 433 MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Cautions for Designing Circuit Board Patterns
Cautions for mounting
Observe the following cautions when designing circuit patterns for this product.
Local Oscillator Circuit (pin 1)
mixer input.
IF Input and Output Block (pin 8, 10)
Demodulator Circuit Block (pin 11)
Data Output Block (pin 30)
RF Amp Circuit Block
IC Mounting Area
a stage subsequent to the output will not affect them.
Isolate the local oscillator circuit block sufficiently from the RF amp block.
Isolate the local oscillator circuit block securely so that its output will not get in the IF input, IF filter, or
Do not place the local oscillator circuit block too close to the ceramic filter.
Isolate the output pattern of the data output block from other circuits as much as possible, so any noise from
1)
2)
3)
Subdivide the ground pattern for the local oscillator circuit block, and connect the subdivisions with thin
lines.
Isolate the input from output patterns of the IF filter and detector block securely from each other.
Isolate the demodulator circuit block sufficiently from the IF input block (pin 8).
Do not place the LC too close to the IC device.
Isolate the data output block sufficiently from the IF input block (pin 8).
Provide a ground pattern under the IC device, and prepare relatively many through holes.
Mount better accurate constants of capacitance in IF filter block and detector block.
Preventing RF amp oscillation
Do not place the patterns connected to pins 16 and 17 too close to each other.
Isolate the patterns connected to the input block (pin 16) and output block (pin 19) from each other.
Make the RF input signal line relatively thin.
Place a relatively wide ground pattern between the RF-IN pin (pin 16) and RF-DEC pin (pin 17).
Connect the RF-OUT pin (pin 19) and MIX-IN pin (pin 20) with the shortest possible pattern.
Attaining a sufficient gain
To attain a sufficient RF amp gain, select an optimum value for the input matching circuit block (pin 16)
according to the board circuit pattern.
Sharing antenna with receiver and transmitter
Using hi power application, place the patterns connected to SAW filter and pin 15 close.
11
TA32305FN/FNG
2003-12-04