AD9880SLASHPCB datasheet(15/64 Pages) AD

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AD9880

Rev. 0 | Page 15 of 64

Power Management

The AD9880 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 7 summarizes how the AD9880 determines which power

mode to be in and which circuitry 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. Bits 2 and 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). Bits 7 to 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

the details.

Table 7. 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 Bits 7 to 2 in Serial Bus Register 0x15.

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

Table 8. Recommended VCO Range and Charge Pump Current Settings for Standard Display Formats

Standard

Resolution

Refresh Rate

Horizontal Frequency

Pixel Rate

VCO Range1

Current

VGA

640 × 480

60 Hz

31.5 kHz

25.175 MHz

101

72 Hz

37.7 kHz

31.500 MHz

011

75 Hz

37.5 kHz

31.500 MHz

100

85 Hz

43.3 kHz

36.000 MHz

100

SVGA

800 × 600

56 Hz

35.1 kHz

36.000 MHz

100

60 Hz

37.9 kHz

40.000 MHz

101

72 Hz

48.1 kHz

50.000 MHz

110

75 Hz

46.9 kHz

49.500 MHz

110

85 Hz

53.7 kHz

56.250 MHz

110

XGA

1024 × 768

60 Hz

48.4 kHz

65.000 MHz

011

70 Hz

56.5 kHz

75.000 MHz

100

75 Hz

60.0 kHz

78.750 MHz

100

80 Hz

64.0 kHz

85.500 MHz

101

85 Hz

68.3 kHz

94.500 MHz

110

SXGA

1280 × 1024

60 Hz

64.0 kHz

108.000 MHz

110

1280 × 1024

75 Hz

80.0 kHz

135.000 MHz

110

480i

60 Hz

15.75 kHz

13.51 MHz

010

480p

60 Hz

31.47 kHz

27 MHz

101

720p

60 Hz

45 kHz

74.25 MHz

100

1035i

60 Hz

33.75 kHz

74.25 MHz

100

1080i

60 Hz

33.75 kHz

74.25 MHz

100

1080p

60 Hz

67.5 KHz

148.5 MHz

110

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

AD9880/PCB Datasheet(PDF) 15 Page - Analog Devices

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