TA31275FNG Toshiba, TA31275FNG Datasheet - Page 10

• Manufacturer Part Number: TA31275FNG
• Description: IC RF/IF DETECTOR 450MHZ 24-SSOP
• Manufacturer: Toshiba

Specifications of TA31275FNG

• Frequency: 240MHz ~ 450MHz
• Rf Type: AM, FM
• Voltage - Supply: 2.4 V ~ 5.5 V
• Current - Supply: 7.3mA
• Package / Case: 24-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Accuracy: -
• Input Range: -
• Other names: TA31275FNGTR

Cautions for Designing Circuit Board Patterns
Observe the following cautions when designing circuit patterns for this product.
Local Oscillator Circuit (pin 1)
mixer input.
lines.
Mixer Output Block (pin 4) to IF Input Block (pin 6)
Demodulator Circuit Block (pin 10)
Data Output Block (pin 12)
a stage subsequent to the output will not affect them.
RF Amp Circuit Block
IC Mounting Area
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.
Subdivide the ground pattern for the local oscillator circuit block, and connect the subdivisions with thin
Isolate the input and output patterns of the IF filter securely from each other.
Isolate the demodulator circuit block sufficiently from the IF input block (pin 6).
Do not place the LC too close to the IC device.
Isolate the data output block sufficiently from the IF input block (pin 6).
Isolate the output pattern of the data output block from other circuits as much as possible, so any noise from
Provide a ground pattern under the IC device, and prepare relatively many through holes.
(1)
(2)
Preventing RF amp oscillation
Attaining a sufficient gain
(pin 13) according to the board circuit pattern.
Do not place the patterns connected to pins 13 and 14 too close to each other.
Isolate the patterns connected to the input block (pin 13) and output block (pin 16) from each other.
Make the RF input signal line relatively thin.
Place a relatively wide ground pattern between the RF-IN pin (pin 13) and RF-DEC pin (pin 14).
Connect the RF-OUT pin (pin 16) and MIX-IN pin (pin 18) with the shortest possible pattern.
To attain a sufficient RF amp gain, select an optimum value for the input matching circuit block
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TA31275FN/ TA31275FNG
03-01-23