ADV7182ABCPZ datasheet(14/102 Pages) AD

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ADV7182A

Data Sheet

Rev. 0 | Page 14 of 102

CRYSTAL OSCILLATOR DESIGN

The ADV7182A requires a stable and accurate clock source to

guarantee operation. This clock is typically provided by a crystal

resonator (XTAL), but can also be provided by a clock oscillator.

The required circuitry for an XTAL is shown in Figure 50. A

damping resistor (RDAMP) is required on the output of the

ADV7182A XTAL amplifier (XTALP). The purpose of this

damping resistor is to limit the current flowing through the

XTAL and to limit the voltage across the XTAL amplifier. To

define the appropriate value of the damping resistor, RDAMP

(see the Typical Circuit Connection section), consult the

accompanying calculator tool (visit the design resources

section at www.analog.com/ADV7182A to download).

The other components in the XTAL circuit must be chosen

carefully; for example, incorrectly selected load capacitors may

result in an offset to the crystal oscillation frequency. For more

information on such considerations, refer to the AN-1260

Application Note, Crystal Design Considerations for Video

Decoders, HDMI Receivers, and Transceivers. After the XTAL

circuit is defined, it is recommended to consult the XTAL

vendor to ensure that the design operates with a sufficient

margin across all conditions.

The evaluation of the ADV7182A was completed using an

XTAL with typical characteristics, as described in Table 9.

Table 9. Reference XTAL Characteristics

Characteristic

Value

Unit

Package

3.2 × 2.5 ×

0.8

Nominal Frequency

28.63636

MHz

Mode of Oscillation

Fundamental

Not

applicable

Frequency Calibration (at 25°C)

±20

ppm

Frequency Temperature Stability

Tolerance

±50

ppm

Operating Temperature Range

−40 to +125

°C

Maximum Equivalent Series

Resistance

Load Capacitance

Drive Level

200

μW

Maximum Shunt Capacitance

Aging per Year

±3

ppm

The values in Table 9 are provided for reference only. It is

recommended to characterize the operation of the XTAL circuit

thoroughly across the operating temperature range of the

application, in conjunction with the XTAL vendor, prior to

releasing any new design.

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