Analog Devices AD8389 Service Manual

Triple, 6-Channel LCD Timing

PRODUCT FEATURES

High speed Up to 85 MHz clock rate Triple (R, G, B) output Matched delay lines Low power dissipation: 40 mW Reference to rising or falling edge of MONITI input Selectable loop delay Available in 48-lead 7 mm × 7 mm LFCSP

APPLICATIONS

LCD microdisplay horizontal timing

FUNCTIONAL BLOCK DIAGRAM

Delay-Locked Loop

AD8389

PRODUCT DESCRIPTION

The AD8389 is a triple 6-channel LCD microdisplay delaylocked timing loop. As part of a closed-loop system, the AD8389 maintains a constant delay between the common input, DXI, and each independent feedback reference, MONITxI.

The AD8389 consists of a selectable fixed delay element, a phase detector, a charge pump, and six matched variable delay lines per color. The phase detector, charge pump, and master delay line form a closed loop when connected to a compatible LCD microdisplay. Five additional delay lines track the master for a complete set of matched timing signals.

The AD8389 dissipates 40 mW nominal power. The AD8389 is offered in a 48-lead 7 mm × 7 mm LFCSP package and operates over the commercial temperature range of 0°C to 85°C.

AVDD(4) AVSS(4) DRVDD(2) DRVSS(2)

COMPEDGE

SLOW

DXI ENBX1I ENBX2I ENBX3I ENBX4I

CLXI

CLK

DXI

INTERNAL

TIMING

SELECTABLE

DELAY

PHASE

DETECTOR

MATCHED VARIABLE

DELAY LINES (6-CHANNEL)

PHASE

DETECTOR

MATCHED VARIABLE

DELAY LINES (6-CHANNEL)

PHASE

DETECTOR

MATCHED VARIABLE

DELAY LINES (6-CHANNEL)

CHARGE

PUMP

CHARGE

PUMP

CHARGE

PUMP

Figure 1.

AD8389

VCONTR

MONITRI DXRO

ENBX1RO ENBX2RO ENBX3RO ENBX4RO CLXRO

VCONTG

MONITGI DXGO

ENBX1GO ENBX2GO ENBX3GO ENBX4GO CLXGO

VCONTB

MONITBI DXBO

ENBX1BO ENBX2BO ENBX3BO ENBX4BO CLXBO

04515-0-001

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

AD8389

TABLE OF CONTENTS

Specifications..................................................................................... 3

Absolute Maximum Ratings............................................................ 4

Exposed Paddle............................................................................. 4

Maximum Power Dissipation ..................................................... 4

Pin Configuration and Function Descriptions............................. 5

REVISION HISTORY

Revision 0: Initial Version

Timing.................................................................................................6

Operating Principles .........................................................................7

Operation .......................................................................................7

Outline Dimensions..........................................................................9

Ordering Guide .............................................................................9

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AD8389

SPECIFICATIONS

Table 1. @ 25°C, AVDD = DRVDD = 3.3 V, T

Parameter Conditions Min Typ Max Unit

LOGIC INPUTS

OUTPUTS

TIMING SPECIFICATIONS

Operating Frequency

CLK, f

CLK

CLXI, ENBX(1–4)I (2t1) DXI, MONITxI (2t1)

Input Low Pulse Width, t1—All Inputs except CLK

DXI, MONITxI 280 ns

ENBX(1–4)I, CLXI t5 ≤ 230ns 30 ns CLK High Pulse Width, t CLK Low Pulse Width, t CLK to DXI Setup Time, t Output Rise, Fall Times—tr, t Delay t

Output Skew, t

t5 ≤ 130 ns 0.3 2.5 ns

t5 ≤ 170ns 0.45 3.4 ns

t5 ≤ 230ns 0.7 5 ns Loop Delay, t

COMPEDGE = H, SLOW = H 9/(f

COMPEDGE = H, SLOW = L 15/(f

COMPEDGE = L, SLOW = H 26/(f

COMPEDGE = L, SLOW = L 32/(f

POWER SUPPLIES

AVDD Operating Range 3 3.6 V DRVDD Operating Range 3 3.6 V Total Operating Current f Power Dissipation f Operating Temperature 0 85 °C

= 0°C, T

MIN

= 85°C, unless otherwise noted

MAX

pF –2 +2 µA

2.0 AVDD V AGND 0.8 V

1.5 V

IO = –2 µA DRVDD – 0.4 V IO = +2 µA DVRSS + 0.4 V

60 75 85 MHz

–1

Hz Hz

4.7 ns

4.7 ns 2 ns CL = 30 pF 5 ns DXI to DXxO 22 350 ns CL = 30 pF

) + t

CLK

) + t4 ns

CLK

) + t4 ns

CLK

) + t4 ns

CLK

= 75 MHz, CL = 30 pF 11 mA

CLK

= 75 MHz, CL = 30 pF 40 mW

CLK

Rev. 0 | Page 3 of 12

AD8389

ABSOLUTE MAXIMUM RATINGS

Table 2. AD8389 Stress Ratings

Parameter Rating

Supply Voltages

AVDDx – AVSSx 3.9 V DRVDDx – DRVSSx 3.9 V

Input Voltages

Maximum Digital Input Voltage AVDD + 0.3 V Minimum Digital Input Voltage AVSS – 0.3 V

Internal Power Dissipation

LFCSP Package @ TA = 25°C 4.8 W Operating Temperature Range 0°C to 85°C Storage Temperature Range –65°C to +125°C Lead Temperature Range (Soldering 10 sec) 300°C

Stresses above those listed under the Absolute Maximum Ratings may cause

permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to the absolute maximum ratings for extended periods may reduce device reliability.

48-Lead LFCSP Package:

= 26°C/W (JEDEC Standard 4-layer PCB in still air)

= 20°C/W

EXPOSED PADDLE

To ensure high reliability, the exposed paddle must be soldered to GND.

MAXIMUM POWER DISSIPATION

The maximum power that can be safely dissipated by the AD8389 is limited by its junction temperature. The maximum

safe junction temperature for plastic encapsulated devices as determined by the glass transition temperature of the plastic is approximately 150°C. Exceeding this limit temporarily may cause a shift in the parametric performance due to a change in the stresses exerted on the die by the package. Exceeding a junction temperature of 175°C for an extended period can result in device failure.

To ensure operation within the specified operating temperature range, it is necessary to limit the maximum power dissipation as follows:

5.0

DMAX

= (T

JMAX

– TA)/θ

4.5

4.0

3.5

3.0

POWER DISSIPATION (W)

2.5

2.0 25 35 45 55 65 75 85 95

AMBIENT TEMPERATURE (°C)

Figure 2. Maximum Power Dissipation vs. Ambient Temperature

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

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