Datasheet > AD9984A

AD9984A

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
亚德诺 - ADI		显示器
页数	文件大小	规格书
44页	616K
描述
High Performance 10-Bit Display Interface

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中文翻译

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数据手册

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AD9984A 数据手册

AD9984A

0x25—Bit[6] HSYNC1 Polarity

HSYNC COUNT

This bit indicates the polarity of HSYNC1 input.

0x26—Bits[7:0] Hsyncs per Vsync MSBs

This register contains the 8 MSBs of the 12-bit counter that

reports the number of Hsyncs per Vsync on the active input. It

is useful for determining the mode and is an aid in setting the

PLL divide ratio.

Table 71. HSYNC1 Polarity Bit

Value

Result

HSYNC1 polarity is negative.

HSYNC1 polarity is positive.

0x27—Bits[7:4] Hsyncs per Vsync LSBs

0x25—Bit[5] VSYNC0 Polarity

This register contains the four LSBs of the 12-bit counter that

reports the number of Hsyncs per Vsync on the active input.

This bit indicates the polarity of VSYNC0 input.

Table 72. VSYNC0 Polarity Bit

TEST REGISTERS

0x28—Bits[7:0] Test Register 1

Value

Result

VSYNC0 polarity is negative.

VSYNC0 polarity is positive.

Must be written to 0xBF for proper operation.

0x29—Bits[7:0] Test Register 2

Must be written to 0x02 for proper operation.

0x2A—Bits[7:0] Test Register 3

Read only bits for future use.

0x25—Bit[4] VSYNC1 Polarity

This bit indicates the polarity of VSYNC1 input.

Table 73. VSYNC1 Polarity Bit

Value

Result

0x2B—Bits[7:0] Test Register 4

Read only bits for future use.

VSYNC1 polarity is negative.

VSYNC1 polarity is positive.

0x25—Bit[3] COAST Polarity

0x2C—Bits[7:5] Offset Hold

This bit indicates the polarity of the external COAST signal.

Must be written to default 0x00 for proper operation.

0x2C—Bit[4] Auto-Offset Hold

Table 74. COAST Polarity Bit

Value

Result

This bit controls whether the auto-offset function runs

COAST polarity is negative.

COAST polarity is positive.

continuously or only once and holds the result. Continuous

updates are recommended because they allow the AD9984A to

compensate for drift over time, temperature, and so on. If one-

time updates are preferred, they should be performed every

time the part is powered up and when there is a mode change.

To perform a one-time update, auto-offset must first be enabled

(Register 0x1B, Bit 5). Next, this bit (auto-offset hold) must first

be set to 0 to let the auto-offset function operate and settle to a

final value. Auto-offset hold should then be set to 1 to hold the

offset values that the auto circuitry calculates. The AD9984A

auto-offset circuit’s maximum settle time is 10 updates. For

example, if the update frequency is set to once every 192 Hsyncs,

the maximum settling time is 1920 Hsyncs (10 × 192 Hsyncs).

0x25—Bit[2] CLAMP Polarity

This bit indicates the polarity of the CLAMP signal.

Table 75. CLAMP Polarity Bit

Value

Result

CLAMP polarity is negative.

CLAMP polarity is positive.

0x25—Bit[1] Extraneous Pulse Detection

A second output from the Hsync filter, this status bit tells

whether extraneous pulses are present on the incoming sync

signal. Often, extraneous pulses are used for copy protection, so

this status bit can be used for this purpose.

Table 77. Auto-Offset Hold Bit

Value

Result

Table 76. Extraneous Pulse Detection Bit

Value

Allows auto-offset to continuously update.

Disables auto-offset updates and holds the current

auto-offset values.

Result

No extraneous pulses detected during active Hsync.

Extraneous pulses detected during active Hsync.

0x2C—Bits[3:0]

0x25—Bit[0] Sync Filter Lock

Must be written to 0x0 for proper operation.

0x2D—Bits[7:0] Test Register 5

When this bit is set to 1, the sync filter is locked. When set to 0,

the sync filer is unlocked.

Read/write bits for future use. Must be written to 0xE8 for

proper operation.

Rev. 0 | Page 38 of 44

1...35 36 373839 40 41...44

中文翻译

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与AD9984A相关器件

型号	品牌	获取价格	描述	数据表
AD9984AKCPZ-140	ADI	获取价格	High Performance 10-Bit Display Interface
AD9984AKCPZ-170	ADI	获取价格	High Performance 10-Bit Display Interface
AD9984AKSTZ-140	ADI	获取价格	High Performance 10-Bit Display Interface
AD9984AKSTZ-170	ADI	获取价格	High Performance 10-Bit Display Interface
AD9984APCBZ	ADI	获取价格	High Performance 10-Bit Display Interface
AD9984KSTZ-110	ROCHESTER	获取价格	SPECIALTY INTERFACE CIRCUIT, PQFP80, LEAD FREE,PLASTIC,MS-026BEC,LQFP-80
AD9984KSTZ-110	ADI	获取价格	IC SPECIALTY INTERFACE CIRCUIT, PQFP80, LEAD FREE,PLASTIC,MS-026BEC,LQFP-80, Interface IC:
AD9984KSTZ-140	ADI	获取价格	IC SPECIALTY INTERFACE CIRCUIT, PQFP80, LEAD FREE,PLASTIC,MS-026BEC,LQFP-80, Interface IC:
AD9984KSTZ-140	ROCHESTER	获取价格	SPECIALTY INTERFACE CIRCUIT, PQFP80, LEAD FREE,PLASTIC,MS-026BEC,LQFP-80
AD9984KSTZ-170	ROCHESTER	获取价格	SPECIALTY INTERFACE CIRCUIT, PQFP80, LEAD FREE,PLASTIC,MS-026BEC,LQFP-80

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