STV0042A/Z STMicroelectronics, STV0042A/Z Datasheet - Page 6

• Manufacturer Part Number: STV0042A/Z
• Description: Video ICs Analog Sound/Video
• Manufacturer: STMicroelectronics
• Type: Audio DSPr

Specifications of STV0042A/Z

• Maximum Operating Temperature: + 70 C
• Package / Case: PDIP-42
• Minimum Operating Temperature: 0 C
• Mounting Style: Through Hole
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

General Information
1.1.1.4 FM PLL Filters
1.1.1.5 FM PLL Charge Pump Capacitors
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Pins DETL and DETR (pins 28 and 36, respectively) are the left and right outputs of their respective
FM phase detectors. These pins are used to connect an external PLL loop filter. The output is a
push-pull current source.
Pins CPUMPL and CPUMPR (pins 27 and 38, respectively) are the FM PLL Charge Pump
Capacitors. The output from the frequency synthesizer is a push-pull current source which requires
capacitors to pull each VCO to the target frequency. The output is ±100 µA to achieve lock and
±2 µA during lock to provide a tracking time constant of approximately 10 Hz.
In order to prevent a false locking in certain marginal conditions, it is best to add a 8.2 V
Zener diode to pins CPUMPL and CPUMPR.
Figure 3: FM Demodulation
STV0042A/Z