AD9380SLASHPCB datasheet(15/60 Pages) AD

15 / 60 page

AD9380

Rev. 0 | Page 15 of 60

Power Management

The AD9380 uses the activity detect circuits, the active interface

bits in the serial bus, the active interface override bits, the

power-down bit, and the power-down pin to determine the

correct power state. There are four power states: full-power,

seek mode, auto power-down, and power-down.

Table 8 summarizes how the AD9380 determines the power

mode and the circuitry that is powered on/off in each of these

modes. The power-down command has priority and then the

automatic circuitry. The power-down pin (Pin 81—polarity set

by Register 0x26[3]) can drive the chip into four power-down

options. Bit 2 and Bit 1 of Register 0x26 control these four

options. Bit 0 controls whether the chip is powered down or the

outputs are placed in high impedance mode (with the exception

of SOG). Bit 7 to Bit 4 of Register 0x26 control whether the

outputs, SOG, Sony Philips digital interface (SPDIF ) or I2S

(IIS or Inter-IC Sound bus) outputs are in high impedance

mode or not. (See the 2-Wire Serial Control Register Detail

section for more detail.)

Table 8. Power-Down Mode Descriptions

Inputs

Mode

Power-Down1

Sync Detect2

Auto PD Enable3

Power-On or Comments

Full Power

Everything

Seek Mode

Everything

Seek Mode

Serial bus, sync activity detect, SOG, band gap

reference

Power-Down

Serial bus, sync activity detect, SOG, band gap

reference

1 Power-down is controlled via Bit 0 in Serial Bus Register 0x26.

2 Sync detect is determined by OR’ing Bit 7 to Bit 2 in Serial Bus Register 0x15.

3 Auto power-down is controlled via Bit 7 in Serial Bus Register 0x27.

Table 9. Recommended VCO Range and Charge Pump Current Settings for Standard Display Formats

Standard

Resolution

Refresh

Rate (Hz)

Horizontal

Frequency (kHz)

Pixel

Rate (MHz)

VCO Range1

Current1

VGA

640 × 480

31.5

25.175

101

37.7

31.500

011

37.5

31.500

100

43.3

36.000

100

SVGA

800 × 600

35.1

36.000

100

37.9

40.000

101

48.1

50.000

110

46.9

49.500

110

53.7

56.250

110

XGA

1024 × 768

48.4

65.000

011

56.5

75.000

100

60.0

78.750

100

64.0

85.500

101

68.3

94.500

110

SXGA

1280 × 1024

64.0

108.000

110

1280 × 1024

80.0

135.000

110

480i

15.75

13.51

010

480p

31.47

101

720p

74.25

100

1035i

33.75

74.25

100

1080i

33.75

74.25

100

1080p

67.5

148.5

110

1 These are preliminary recommendations for the analog PLL and are subject to change without notice.

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