Analog Devices AD8568, AD8569, AD8570 Service Manual

16 V Rail-to-Rail

a

FEATURES
Single-Supply Operation: 4.5 V to 16 V
Input Capability Beyond the Rails
Rail-to-Rail Output Swing
Continuous Output Current: 35 mA
Peak Output Current: 250 mA
Offset Voltage: 10 mV Max
Slew Rate: 6 V/s
Stable with 1 F Loads
Supply Current

APPLICATIONS
LCD Reference Drivers
Portable Electronics
Communications Equipment

GENERAL DESCRIPTION

The AD8568, AD8569, and AD8570 are low-cost, single-supply
buffer amplifiers with rail-to-rail input and output capability. They
are optimized for LCD monitor applications and built on an
advanced high voltage CBCMOS process. The AD8568 includes
two buffers, the AD8569 includes four buffers, and the AD8570
includes eight buffers.

These LCD buffers have high slew rates, 35 mA continuous
output drive, and high capacitive load drive capability. They
have a wide supply range and offset voltages below 10 mV.

The AD8568, AD8569, and AD8570 are specified over the –40°C
to +85°C temperature range. They are available on tape and reel,
with the AD8568 packaged in a 6-lead SOT-23, the AD8569
in a 10-lead MSOP, and the AD8570 in a 32-lead LFCSP and
20-lead TSSOP.

Buffer Amplifiers

AD8568/AD8569/AD8570

PIN CONFIGURATIONS

6-Lead SOT-23

(RT Suffix)

1

OUT B

V+ 1

NC 2
IN C 3
IN D 4
IN E 5
IN F 6

NC 7

V+ 8

OUT A

2

IN A

GND

3

AD8568

10-Lead MSOP

(RM Suffix)

OUT A

1

2

IN A

V+

3

AD8569

4

IN B

56

32-Lead LFCSP

(CP Suffix)

32 NC

31 IN B

30 IN A

29 NC

PIN 1
INDICATOR

AD8570

TOP VIEW

28 NC

27 OUT A

6

OUT B

V+

5

IN B

4

10

OUT D

9

IN D

8

GND

IN C

7

OUT C

26 OUT B

25 NC

24 GND
23 NC
22 OUT C
21 OUT D
20 OUT E
19 OUT F
18 NC
17 GND

REV. C

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use, nor for any infringements of patents or other rights of third parties that
may result from its use. 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.

NC 9

NC 12

NC 13

OUT H 14

OUT G 15

NC 16

IN H 11

IN G 10

NC = NO CONNECT

20-Lead TSSOP

1

IN 1

2

IN 2

3

V+

4

AD8570-ARU

IN 3

IN 4

IN 5

IN 6

V+

IN 7

IN 8

TOP VIEW

5

6

7

8

9

10

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] © 2003 Analog Devices, Inc. All rights reserved.

20

OUT 1

19

OUT 2

18

V–

17

OUT 3

16

OUT 4

15

OUT 5

14

OUT 6

13

V–

12

OUT 7

11

OUT 8

AD8568/AD8569/AD8570–SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

(4.5 V ≤ VS ≤ 16 V, VCM = VS/2, TA = 25C, unless otherwise noted.)

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage V
Offset Voltage Drift ∆V
Input Bias Current I

B

OS

/∆T –40°C ≤ TA ≤ +85°C5µV/°C

OS

210mV

80 600 nA

–40°C ≤ TA ≤ +85°C 800 nA

Input Voltage Range –0.5 –V
Input Impedance Z
Input Capacitance C

IN

IN

400 kΩ
1pF

+ 0.5 V

S

OUTPUT CHARACTERISTICS

Output Voltage High V

Output Voltage Low V

Continuous Output Current I
Peak Output Current I

OH

OL

OUT

PK

IL = 100 µAV

= 16 V, IL = 5 mA 15.85 15.95 V

V

S

–40°C ≤ T

= 4.5 V, IL = 5 mA 4.2 4.38 V

V

S

–40°C ≤ T

≤ +85°C 15.75 V

A

≤ +85°C 4.1 V

A

– 0.005 V

S

IL = 100 µA5mV

= 16 V, IL = 5 mA 42 150 mV

V

S

–40°C ≤ T
V

= 4.5 V, IL = 5 mA 95 300 mV

S

–40°C ≤ T

≤ +85°C 250 mV

A

≤ +85°C 400 mV

A

35 mA

VS = 16 V 250 mA

TRANSFER CHARACTERISTICS

Gain A

VCL

RL = 2 kΩ 0.995 0.9985 1.005 V/V
–40°C ≤ T

≤ +85°C 0.995 0.9980 1.005 V/V

A

Gain Linearity NL RL = 2 kΩ, VO = 0.5 to (VS – 0.5 V) 0.01 %

POWER SUPPLY

Supply Voltage V

S

Power Supply Rejection Ratio PSRR V

Supply Current/Amplifier I

SY

= 4 V to 17 V

S

–40°C ≤ T

≤ +85°C7090 dB

A

VO = VS/2, No Load 700 850 µA

4.5 16 V

–40°C ≤ TA ≤ +85°C1mA

DYNAMIC PERFORMANCE

Slew Rate SR RL = 10 kΩ, CL = 200 pF 4 6 V/µs
Bandwidth BW –3 dB, R
Phase Margin Øo R

L

= 10 kΩ, CL = 10 pF 6 MHz

L

= 10 kΩ, CL = 10 pF 65 Degrees

Channel Separation 75 dB

NOISE PERFORMANCE

Voltage Noise Density e

Current Noise Density i

Specifications subject to change without notice.

n

e

n

n

f = 1 kHz 26 nV/√Hz
f = 10 kHz 25 nV/√Hz
f = 10 kHz 0.8 pA/√Hz

–2–

REV. C

AD8568/AD8569/AD8570

ABSOLUTE MAXIMUM RATINGS*

Supply Voltage (VS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V

Input Voltage . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V

Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . V

+ 0.5 V

S

S

Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C

Operating Temperature Range . . . . . . . . . . . –40°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 perma-

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

ORDERING GUIDE

Temperature Package Package Branding

Model Range Description Option Information

AD8568ART-R2 –40°C to +85°C 6-Lead SOT-23 RT-6 AWA
AD8568ART-REEL –40°C to +85°C 6-Lead SOT-23 RT-6 AWA
AD8568ART-REEL7 –40°C to +85°C 6-Lead SOT-23 RT-6 AWA
AD8569ARM-R2 –40°C to +85°C 10-Lead MSOP RM-10 AXA
AD8569ARM-REEL –40°C to +85°C 10-Lead MSOP RM-10 AXA
AD8569ARMZ-REEL* –40°C to +85°C 10-Lead MSOP RM-10 AXA
AD8570ACP-R2 –40°C to +85°C 32-Lead LFCSP CP-32-2
AD8570ACP-REEL –40°C to +85°C 32-Lead LFCSP CP-32-2
AD8570ACP-REEL7 –40°C to +85°C 32-Lead LFCSP CP-32-2
AD8570ARU –40°C to +85°C 20-Lead TSSOP RU-20
AD8570ARU-REEL –40°C to +85°C 20-Lead TSSOP RU-20

*Z = Pb-free part.

Package Type 

1

JA



JC



2

Unit

JB

6-Lead SOT-23 (RT) 250 140 °C/W
10-Lead MSOP (RM) 200 44 °C/W
20-Lead TSSOP (RU) 72 45 °C/W
32-Lead LFCSP (CP) 35 13 °C/W

NOTES

1

θJA is specified for worst-case conditions, i.e., θ

onto a circuit board for surface-mount packages.

2

⌿JB is applied for calculating the junction temperature by reference to the board

temperature.

is specified for a device soldered

JA

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
the AD8568/AD8569/AD8570 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.

WARNING!

ESD SENSITIVE DEVICE

REV. C

–3–

AD8568/AD8569/AD8570

–Typical Performance Characteristics

100

TA = 25C

90

4.5V < V

< 16V

S

80

70

60

50

40

30

QUANTITY (Amplifiers)

20

10

0

12 9

6 3

INPUT OFFSET VOLTAGE (mV)

0 36912

TPC 1. Input Offset Voltage Distribution

300

4.5V < VS < 16V

250

200

150

100

QUANTITY (Amplifiers)

50

0

0 10010

20 30 40 50 60 70 80 90

TCVOS (V/C)

TPC 2. Input Offset Voltage Drift Distribution

0

VCM = VS/2

50

100

150

200

250

INPUT BIAS CURRENT (nA)

300

350

40

VS = 16V

VS = 4.5V

25 85

TEMPERATURE (C)

TPC 4. Input Bias Current vs. Temperature

5

4

3

2

1

0

1

2

INPUT OFFSET CURRENT (nA)

3

4

5

40

VS = 4.5V

VS = 16V

25 85

TEMPERATURE (C)

TPC 5. Input Offset Current vs. Temperature

0

VCM = VS/2

0.25

0.50

0.75

1.00

INPUT OFFSET VOLTAGE (mV)

1.25

1.50

40

VS = 16V

VS = 4.5V

25 85

TEMPERATURE (C)

TPC 3. Input Offset Voltage vs. Temperature

–4–

15.96

15.95

15.94

15.93

15.92

15.91

15.90

15.89

OUTPUT VOLTAGE SWING (V)

15.88

15.87

15.86

VS = 16V

VS = 4.5V

40

25 85

TEMPERATURE (C)

I

LOAD

= 5mA

TPC 6. Output Voltage Swing vs. Temperature

4.46

4.45

4.44

4.43

4.42

4.41

4.40

4.39

4.38

4.37

4.36

REV. C