ANALOG DEVICES AD8644 Service Manual

Single and Quad 18 V

www.BDTIC.com/ADI

FEATURES

Unity-gain bandwidth: 5.5 MHz Low voltage offset: 1.0 mV Slew rate: 7.5 V/μs Single-supply operation: 5 V to 18 V High output current: 70 mA Low supply current: 800 μA/amplifier Stable with large capacitive loads Rail-to-rail inputs and outputs

APPLICATIONS

LCD gamma and V Modems Portable instrumentation Direct access arrangement

GENERAL DESCRIPTION

The AD8614 (single) and AD8644 (quad) are single-supply,

5.5 MHz bandwidth, rail-to-rail amplifiers optimized for LCD monitor applications.

They are processed using the Analog Devices, Inc. high voltage, extra fas proprietary process includes trench-isolated transistors that lower internal parasitic capacitance, which improves gain bandwidth, phase margin, and capacitive load drive. The low supply current of 800 μA (typical) per amplifier is critical for portable or densely packed designs. In addition, the rail-to-rail output swing provides greater dynamic range and control than standard video amplifiers provide.

These products operate from supplies of 5 V to as high as 18 V. T slew rates, and high capacitive drive capability makes the AD8614/AD8644 an ideal choice for LCD applications.

The AD8614 and AD8644 are specified over the temperature ra 14-lead TSSOP, and 14-lead SOIC surface-mount packages in tape and reel.

t complementary bipolar (HV XFCB) process. This

he unique combination of an output drive of 70 mA, high

nge of –20°C to +85°C. They are available in 5-lead SOT-23,

COM

drivers

Operational Amplifiers

AD8614/AD8644

PIN CONFIGURATIONS

1

OUT A

V–

+IN

AD8614

2

TOP VIEW

(Not to Scale)

3

Figure 1. 5-Lead SOT-23

(RJ-5)

1

OUT A

2

–IN A

3

V+

AD8644

TOP VIEW

4

(Not to Scale)

5

6

7

+IN A

+IN B

–IN B

OUT B

Figure 2. 14-Lead TSSOP

(R

U-14)

OUT A

1

–IN A

2

+IN A

3

AD8644

TOP VIEW

4

V+

(Not to Scale)

5

+IN B

–IN B

6

OUT B

7

Figure 3. 14-Lead Narrow Body SOIC

(R

-14)

14

13

12

11

10

14

13

12

11

10

9

8

9

8

V+

5

4

–IN

OUT D

–IN D

+IN D

V–

+IN C

–IN C

OUT C

OUT D

–IN D

+IN D

V–

+IN C

–IN C

OUT C

06485-001

6485-002

06485-003

Rev. B

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her 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.

AD8614/AD8644

www.BDTIC.com/ADI

REVISION HISTORY

9/07—Rev. A to Rev B

Change to Current Noise Density in Table 1 ................................ 3

12/06—Rev. 0 to Rev. A

Updated Format..................................................................Universal

Deleted SPICE Model Availability Section.................................. 12

Updated Outline Dimensions....................................................... 13

Changes to Ordering Guide.......................................................... 14

10/99—Revision 0: Initial Version

Output Short-Circuit Protection.................................................9

Input Overvoltage Protection................................................... 10

Output Phase Reversal............................................................... 10

Power Dissipation....................................................................... 10

Unused Amplifiers ..................................................................... 10

Capacitive Load Drive ............................................................... 11

Direct Access Arrangement...................................................... 11

A One-Chip Headphone/Microphone Preamplifier

Solution........................................................................................ 11

Outline Dimensions....................................................................... 13

Ordering Guide .......................................................................... 14

Rev. B | Page 2 of 16

AD8614/AD8644

www.BDTIC.com/ADI

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

5 V ≤ VS ≤ 18 V, VCM = VS/2, TA = 25°C, unless otherwise noted.

Table 1.

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage VOS 1.0 2.5 mV

−20°C ≤ TA ≤ +85°C 3 mV Input Bias Current IB 80 400 nA

−20°C ≤ TA ≤ +85°C 500 nA Input Offset Current IOS 5 100 nA

−20°C ≤ TA ≤ +85°C 200 nA Input Voltage Range 0 VS V Common-Mode Rejection Ratio CMRR VCM = 0 V to VS 60 75 dB Voltage Gain AVO V

OUTPUT CHARACTERISTICS

Output Voltage High VOH I Output Voltage Low VOL I Output Short-Circuit Current ISC 35 70 mA

−20°C ≤ TA ≤ +85°C 30 mA

POWER SUPPLY

Power Supply Rejection Ratio PSRR VS = ±2.25 V to ±9.25 V 80 110 dB Supply Current/Amplifier ISY 0.8 1.1 mA

−20°C ≤ TA ≤ +85°C 1.5 mA

DYNAMIC PERFORMANCE

Slew Rate SR CL = 200 pF 7.5 V/μs Gain Bandwidth Product GBP 5.5 MHz Phase Margin Φo 65 Degrees Settling Time tS 0.01%, 10 V step 3 μs

NOISE PERFORMANCE

Voltage Noise Density en f = 1 kHz 12 nV/√Hz e Current Noise Density in f = 10 kHz 1 pA/√Hz

1

All typical values are for VS = 18 V.

f = 10 kHz 11 nV/√Hz

n

OUT

LOAD

1

= 0.5 V to VS – 0.5 V, RL = 10 kΩ 10 150 V/mV

= 10 mA VS − 0.15 V = 10 mA 65 150 mV

Rev. B | Page 3 of 16

AD8614/AD8644

www.BDTIC.com/ADI

ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

Supply Voltage 20 V Input Voltage GND to VS Storage Temperature Range −65°C to +150°C Operating Temperature Range −20°C to +85°C Junction Temperature Range −65°C to +150°C Lead Temperature Range (Soldering, 60 sec) 300°C

Stresses above those listed under 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 absolute maximum rating conditions for extended periods may affect device reliability.

THERMAL RESISTANCE

θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages.

Table 3. Thermal Resistance

Package Type θJA θ

5-Lead SOT-23 (RJ) 230 140 °C/W 14-Lead TSSOP (RU) 180 35 °C/W 14-Lead SOIC (R) 120 56 °C/W

Unit

JC

ESD CAUTION

Rev. B | Page 4 of 16

AD8614/AD8644

www.BDTIC.com/ADI

TYPICAL PERFORMANCE CHARACTERISTICS

50

VS=18V R

=2kΩ

45

L

T

=25°C

A

40

35

30

25

20

15

10

SMALL SIGNAL OVERSHOOT (%)

5

0

10 100 1k 10k

+OS

–OS

CAPACITANCE (p F)

Figure 4. Small Signal Overshoot vs. Load Capacitance

06485-004

7.5 VS=5V R

=2kΩ

6.5

L

C

=200pF

L

A

=1

V

5.5 T

=25°C

A

4.5

3.5

2.5

1.5

VOLTAGE (1V/DIV)

0.5

–0.5

–1.5

–2.5

TIME (1µs/DIV)

Figure 7. Large Signal Transient Response, V

= 5 V

S

06485-007

12

8

0.1%

4

0

–4

OUTPUT SWING FROM 0 TO ±V

–8

–12

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5

0.1%

SETTLING TIME (µs)

0.01%

Figure 5. Output Swing vs. Settling Time

80

60

40

5V ≤ VS≤ 18V

=1MΩ

R

20

L

=40pF

C

L

= 25°C

T

0

A

GAIN (dB)

45

90

135

180

29

VS=18V R

=2kΩ

25

L

C

=200pF

L

A

=1

V

21

T

= 25°C

A

17

13

9

5

VOLTAGE (4V/DIV)

1

–3

–7

06485-005

–11

TIME (1µs/DIV)

06485-008

PHASE SHIFT (Degrees)

Figure 8. Large Signal Transient Response, V

V

S

2

VS=5V≤ VS≤ 18V R

=2kΩ

L

C

= 200pF A T

L

=1

V

= 25°C

A

VOLTAGE (50mV/DIV)

= 18 V

S

1k 10k 100k 1M 10M 100M

FREQUENCY ( Hz)

Figure 6. Open-Loop Gain and Phase Shift vs. Frequency

06485-006

Figure 9. Small Signal Transient Response

Rev. B | Page 5 of 16

TIME (500ns/DIV)

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ANALOG DEVICES AD8644 Service Manual

FEATURES

APPLICATIONS

GENERAL DESCRIPTION

PIN CONFIGURATIONS

TABLE OF CONTENTS

REVISION HISTORY

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

ABSOLUTE MAXIMUM RATINGS

THERMAL RESISTANCE

ESD CAUTION

TYPICAL PERFORMANCE CHARACTERISTICS