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TDA8040T Datasheet(PDF) 2 Page - NXP Semiconductors |
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TDA8040T Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 16 page 1996 Oct 08 2 Philips Semiconductors Objective specification Quadrature demodulator TDA8040T FEATURES • +5 V supply voltage • Bandgap internal reference voltage • Low crosstalk between I (in-phase) and Q (quadrature) channel outputs • High operating input sensitivity • High Carrier-to-Noise Ratio (CNR) of the VCO. APPLICATIONS • Quadrature Phase Shift Keying (QPSK) demodulation. GENERAL DESCRIPTION The TDA8040T is a monolitic bipolar IC dedicated for quadrature demodulation. It has been designed to operate in conjunction with the TDA8041H to provide a complete QPSK demodulator. The design of this circuit has been optimized to provide the best quadrature accuracy necessary for digital receiver applications and particularly for digital television. The TDA8040T includes two matched mixers, an RF amplifier, a symmetrical Voltage Controlled Oscillator (VCO), a frequency divider and two matched amplifiers. Two external filters are required for the baseband filtering. The VCO requires an external LC tank circuit with two varicap diodes. This oscillator operates at twice the IF carrier frequency and can be used in a carrier recovery AFC loop. QUICK REFERENCE DATA ORDERING INFORMATION SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT VCC supply voltage 4.5 5.0 5.5 V ICC(tot) total supply current VCC = 5 V 70 79 90 mA Vi(RF) operating input voltage level 64 67 70 dB µV fi(RF) RF input signal frequency 10.7 − 150 MHz VolQ(p-p) I and Q output voltage (peak-to-peak value) − 0.5 − V E φ(IQ) phase error between the I and Q channels −− 3 deg EG(IQ) gain error between the I and Q channels −− 1dB EG(tilt) gain tilt error in the I and Q channels −− 1dB α ct(IQ) crosstalk between the I and Q channels 30 −− dB IM3 intermodulation distortion in the I and Q channels 40 −− dB TYPE NUMBER PACKAGE NAME DESCRIPTION VERSION TDA8040T SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1 |
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