TCA440 查看數據表（PDF） - Gunter Seniconductor GmbH.
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TCA440 Datasheet PDF : 12 Pages
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Functional Description
It contains several function units, which enable designing and assembling of efficient AM tuners. Caused by
internal voltage stabilization characteristics are rather independent from supply voltage.
The RF input signal reaches via a controllable and overdriving proof preselector stage a balanced mixer. By
means of a RF - signal generated by a separated oscillator the input signal is transported into IF. Multiplicative
mixing causes only few harmonic content. Gain control is carried out by means of two separated feedback control
loops for preselector stage and IF amplifier. By these a loop bandwidth of approximately 100 dB is obtained. The
control voltage of the IF - amplifier can be used to drive a moving - coil instrument (field strength indicator). The IF
amplifier consists of 4 amplifier stages, the first, second and third can be controlled. The bandwidth of the IF
amplifier is approximately 2 MHz and on that account sufficient for usual IF frequencies in the AM range of
approximately 460 kHz.
The symmetrical arrangement of the entire circuitry guarantees well oscillating. The bridge of the mixer avoids
direct breakdown.
Absolute Maximum Ratings
Supply voltage
Junction temperature
Ambient operating temperature
Storage temperature
Total thermal resistance
VCC
Tj
Ta
Ts
Rthja
min
max
unit
4.5
15.0
V
150
°C
-15
80
°C
-40
125
°C
120
K/W
Recommended Operational Conditions
Supply voltage
VCC
Ambient operating temperature
Ta
min
max
unit
4.5
15
V
-10
70
°C
09/00
3
TCA440/T
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