U4468B-MG19

U4468B-MG19 Datasheet


The U4468B is an integrated bipolar circuit for full multistandard sound IF signal processing in TV/VTR and multimedia applications. It supplies AM signals as well as FM/NICAM sound IF signals and thus allows the design of a universal sound IF module for various applications.

Part Datasheet
U4468B-MG19 U4468B-MG19 U4468B-MG19 (pdf)
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• 5-V Supply Voltage
• Gain-controlled 3-stage Wide-band IF Amplifier
• Active Carrier Generation by FPLL Principle Frequency-Phase-Locked-Loop for True

Quadrature Demodulation
• Complete Alignment-free AM Demodulator
• Switchable Amplitude Detector for Gain Control, which Operates as a

Peak Detector for FM Sound and as a Mean Level Detector for AM Sound
• Pb-free Package, which is Compliant with Requirements of RoHS

The U4468B is an integrated bipolar circuit for full multistandard sound IF signal processing in TV/VTR and multimedia applications. It supplies AM signals as well as FM/NICAM sound IF signals and thus allows the design of a universal sound IF module for various applications.

Quasi-split Sound Circuit and AM Demodulator IC

U4468B

Figure Block Diagram

IFFM IFAM
2 IF-amp 1

Loop filter

FPLL
05 905 VCO 9

Intercarrier FM
3 AGC

Mean

Peak level

IF AGC Mean/peak

AM-det
6 AF AM
10 Mute S2

Circuit Description

IF Amplifier and AGC

The symmetrical IF input signal from the external SAW filter is fed to the pins 1 and In case of FM/NICAM applications, a SAW filter with double band-pass characteristic is required for the vision and sound carrier. In case of the L-standard, a band-pass filter with the center frequency at the L-sound carrier is used.

The amplifier consists of three AC-coupled wide-band IF stages. Each differential amplifier stage is gain controlled by the AGC Automatic Gain Control voltage, available at pin The output signal of the IF amplifier is then applied to the FPLL carrier generation, to the mixer for FM/NICAM signals and to the AM demodulator.

The IF-AGC is derived from the average level of the AM carrier L-standard or from the peak value of the FM carrier e.g., B/G standard . It controls the three-stage wide-band amplifier to provide a constant SIF signal to the AM demodulator or to the QSS quasi-split sound mixer.

Standard Switch

If the standard switch pin 7 is in position “low” for AM sound , the AGC is operating as an average level detector. In position “open” or “high” for FM/NICAM sound , the AGC acts as a peak value detector.

Internal Voltage Stabilizer

The internal band gap reference voltage 4.25V at pin 4 ensures constant performance, independent of supply voltage and temperature.

FPLL, VCO

The FPLL frequency-phase-locked loop circuit consists of a frequency detector and a phase detector to generate a control voltage for the VCO tuning. In locked mode, the VCO is controlled by the phase detector while in unlocked mode, the frequency detector is superimposed. The VCO operates with an external resonance circuit L and C parallel and is controlled by integrated varicaps.

A practicable VCO alignment of the external coil is the adjustment of the loop filter voltage pin 5 to V. At this value, the capture and hold range are centered.

AM Demodulator

The alignment-free AM demodulator is realized by a synchronous detector. The modulated IF signal from the wide-band IF amplifier output is multiplied in phase with the limited SIF signal to remove the AM. Then, the resulting AF signal of the demodulator output is fed to the output amplifier and to the AGC stage.

Quasi-Split-Sound QSS Mixer

The QSS mixer is realized by a multiplier circuit. The IF signal FM/NICAM is converted to the intercarrier frequency by means of a quadrature signal from the generated picture carrier provided by the PLL. The intercarrier signal is fed via an output amplifier to pin

Mute Switch

The AM sound output pin 6 can be muted by switching the pulling mute switch pin 10 to “low”.
2 U4468B

Pin Configuration

Figure Pinning DIP16
Ordering Information

Extended Type Number U4468B-MG

Package DIP16, Pb-free

Package Information

Package DIP16

Dimensions in mm

Remarks Tube

U4468B

Standard Package Quantity 1,400

Alternative 16
technical drawings according to DIN specifications

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Datasheet ID: U4468B-MG19 519499