Analog Devices AD8531 2 4 d Datasheet

Low Cost, 250 mA Output

1

2

3

5

4

ⴚIN A

+IN A

V+

OUT A

AD8531

Vⴚ

a

FEATURES
Single-Supply Operation: 2.7 Volts to 6 Volts
High Output Current: ⴞ250 mA
Low Supply Current: 750 ␮A/Amplifier
Wide Bandwidth: 3 MHz
Slew Rate: 5 V/␮s
No Phase Reversal
Low Input Currents
Unity Gain Stable
Rail-to-Rail Input and Output

APPLICATIONS
Multimedia Audio
LCD Driver
ASIC Input or Output Amplifier
Headphone Driver

GENERAL DESCRIPTION

The AD8531, AD8532, and AD8534 are single, dual and quad
rail-to-rail input and output single-supply amplifiers featuring
250 mA output drive current. This high output current makes
these amplifiers excellent for driving either resistive or capacitive
loads. AC performance is very good with 3 MHz bandwidth,
5 V/ms slew rate and low distortion. All are guaranteed to oper­ate from a 3 volt single supply as well as a 5 volt supply.

The very low input bias currents enable the AD853x to be used
for integrators, diode amplification and other applications requiring
low input bias current. Supply current is only 750 mA per amplifier
at 5 volts, allowing low current applications to control high
current loads.

Applications include audio amplification for computers, sound
ports, sound cards and set-top boxes. The AD853x family is
very stable and capable of driving heavy capacitive loads, such as
those found in LCDs.

The ability to swing rail-to-rail at the inputs and outputs enables
designers to buffer CMOS DACs, ASICs or other wide output
swing devices in single-supply systems.

The AD8531, AD8532, and AD8534 are specified over the
extended industrial (–40∞C to +85∞C) temperature range. The
AD8531. The AD8532 is available in 8-lead SOIC, MSOP,
TSSOP surface-mount packages. The AD8534 is available in
narrow SO-14 and 14-lead TSSOP surface-mount packages.
All TSSOP, SOT, and SC70 versions are available in tape
and reel only.

Single-Supply Amplifiers

AD8531/AD8532/AD8534

PIN CONFIGURATIONS

5-Lead SC70 and SOT-23

(KS and RT Suffixes)

8-Lead SOIC, TSSOP, and MSOP

(R, RU, and RM Suffixes)

1

NULL

AD8531

2

–IN A

3

+IN A

4

V–

8-Lead SOIC, TSSOP, and MSOP

(R, RU, and RM Suffixes)

OUT A

1

–IN A

2

3

+IN A

4

V–

14-Lead SOIC, and TSSOP

(R, and RU Suffixes)

1

OUT A

2

–IN A

3

+IN A

4

V+

5

+IN B

6

–IN B

7

OUT B

AD8532

AD8534

8

NC

V+

7

OUT A

6

5

NULL

8

V+

7

OUT B

6

–IN B

5

+IN B

14

OUT D

–IN D

13

12

+IN D

11

V–

10

+IN C

9

–IN C

8

OUT C

REV. D

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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] © Analog Devices, Inc., 2002

AD8531/AD8532/AD8534–SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

(@ VS = 3.0 V, VCM = 1.5 V, TA = 25ⴗC unless otherwise noted)

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage V

Input Bias Current I

Input Offset Current I

B

OS

OS

–40∞C £ T

–40∞C £ T

–40∞C £ T

£ +85∞C30mV

A

550 pA

£ +85∞C60pA

A

125 pA

£ +85∞C30pA

A

25 mV

Input Voltage Range 0 3 V
Common-Mode Rejection Ratio CMRR V
Large Signal Voltage Gain A
Offset Voltage Drift DV
Bias Current Drift DI

VO

/DT20mV/∞C

OS

/DT50fA/∞C

B

= 0 V to 3 V 38 45 dB

CM

RL = 2 kW, VO = 0.5 V to 2.5 V 25 V/mV

Offset Current Drift DIOS/DT20fA/∞C

OUTPUT CHARACTERISTICS

Output Voltage High V

Output Voltage Low V

Output Current I
Closed-Loop Output Impedance Z

OH

OL

OUT

OUT

IL = 10 mA 2.85 2.92 V
–40∞C £ T

£ +85∞C 2.8 V

A

IL = 10 mA 60 100 mV
–40∞C £ T

£ +85∞C 125 mV

A

± 250 mA

f = 1 MHz, AV = 1 60 W

POWER SUPPLY

Power Supply Rejection Ratio PSRR V
Supply Current/Amplifier I

SY

= 3 V to 6 V 45 55 dB

S

VO = 0 V 0.70 1 mA
–40∞C £ TA £ +85∞C1.25 mA

DYNAMIC PERFORMANCE

Slew Rate SR RL = 2 kW 3.5 V/ms
Settling Time t

S

To 0.01% 1.6 ms

Gain Bandwidth Product GBP 2.2 MHz
Phase Margin fo70Degrees
Channel Separation CS f = 1 kHz, RL = 2 kW 65 dB

NOISE PERFORMANCE

Voltage Noise Density e

n

f = 1 kHz 45 nV/÷Hz
f = 10 kHz 30 nV/÷Hz

Current Noise Density i

Specifications subject to change without notice.

n

f = 1 kHz 0.05 pA/÷Hz

–2–

REV. D

AD8531/AD8532/AD8534

ELECTRICAL CHARACTERISTICS

(@ VS = 5.0 V, VCM = 2.5 V, TA = 25ⴗC unless otherwise noted)

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage V

Input Bias Current I

Input Offset Current I

B

OS

OS

–40∞C £ T

–40∞C £ T

–40∞C £ T

£ +85∞C30mV

A

550 pA

£ +85∞C60pA

A

125 pA

£ +85∞C30pA

A

25 mV

Input Voltage Range 0 5 V
Common-Mode Rejection Ratio CMRR V
Large Signal Voltage Gain A
Offset Voltage Drift DV
Bias Current Drift DI

VO

/DT –40∞C £ TA £ +85∞C20mV/∞C

OS

/DT50fA/∞C

B

= 0 V to 5 V 38 47 dB

CM

RL = 2 kW, VO = 0.5 V to 4.5 V 15 80 V/mV

Offset Current Drift DIOS/DT20fA/∞C

OUTPUT CHARACTERISTICS

Output Voltage High V

Output Voltage Low V

Output Current I
Closed-Loop Output Impedance Z

OH

OL

OUT

OUT

IL = 10 mA 4.9 4.94 V
–40∞C £ T

£ +85∞C4.85 V

A

IL = 10 mA 50 100 mV
–40∞C £ T

£ +85∞C 125 mV

A

± 250 mA

f = 1 MHz, AV = 1 40 W

POWER SUPPLY

Power Supply Rejection Ratio PSRR V
Supply Current/Amplifier I

SY

= 3 V to 6 V 45 55 dB

S

VO = 0 V 0.75 1.25 mA
–40∞C £ TA £ +85∞C1.75 mA

DYNAMIC PERFORMANCE

Slew Rate SR RL = 2 kW 5V/ms
Full-Power Bandwidth BW
Settling Time t

S

p

1% Distortion 350 kHz
To 0.01% 1.4 ms

Gain Bandwidth Product GBP 3 MHz
Phase Margin fo70Degrees
Channel Separation CS f = 1 kHz, RL = 2 kW 65 dB

NOISE PERFORMANCE

Voltage Noise Density e

n

f = 1 kHz 45 nV/÷Hz
f = 10 kHz 30 nV/÷Hz

Current Noise Density i

Specifications subject to change without notice.

n

f = 1 kHz 0.05 pA/÷Hz

REV. D

–3–

AD8531/AD8532/AD8534

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS

1

PACKAGE INFORMATION

Supply Voltage (VS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V

Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND to V

S

Differential Input Voltage2 . . . . . . . . . . . . . . . . . . . . . . . ± 6 V

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

NOTES

1

Stresses above those listed under Absolute Maximum Ratings may cause perma-

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

2

For supplies less than +6 volts, the differential input voltage is equal to ± VS.

Package Type ␪JA* ␪

JC

5-Lead SC70 (KS) 376 126 ∞C/W
5-Lead SOT-23 (RT) 230 146 ∞C/W
8-Lead SOIC (RN) 158 43 ∞C/W
8-Lead MSOP (RM) 210 45 ∞C/W
8-Lead TSSOP (RU) 240 43 ∞C/W
14-Lead SOIC (RN) 120 36 ∞C/W
14-Lead TSSOP (RU) 240 43 ∞C/W

*qJA is specified for the worst case conditions, i.e., qJA is specified for device in socket

for P-DIP packages; qJA is specified for device soldered onto a circuit board for
surface-mount packages.

Unit

ORDERING GUIDE

Model Temperature Range Package Description Package Option Branding Information

AD8531AKS* –40∞C to +85∞C 5-Lead SC70 KS-5 A7B
AD8531AR –40∞C to +85∞C 8-Lead SOIC RN-8
AD8531ART* –40∞C to +85∞C 5-Lead SOT-23 RT-5 A7A

AD8532AR –40∞C to +85∞C 8-Lead SOIC RN-8
AD8532ARM* –40∞C to +85∞C 8-Lead MSOP RM-8 ARA
AD8532ARU* –40∞C to +85∞C 8-Lead TSSOP RU-8

AD8534AR –40∞C to +85∞C 14-Lead SOIC RN-14
AD8534ARU* –40∞C to +85∞C 14-Lead TSSOP RU-14

*Available in reels only.

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 AD8531/AD8532/AD8534 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.

2.5

–V

OL

2

+V

OH

1.5

OUT

ⴞV

1

0.5

0

020406080100 120 140 160 180 200

R

LOAD –

⍀

Figure 1. Output Voltage vs. Load. VS = ±2.5 V, RL Is Connected to GND (0 V)

–4–

REV. D

Typical Performance Characteristics–AD8531/AD8532/AD8534

g

VS = 2.7V

V

= 1.35V

500

400

300

200

QUANTITY – Amplifiers

100

–12

–10 –8 –6 –4 –2 0 2 4

INPUT OFFSET VOLTAGE – mV

T

CM

= 25ⴗC

A

Figure 2. Input Offset Voltage
Distribution

VS = 5V, 3V

8

V

= VS/2

CM

7

6

5

4

3

INPUT BIAS CURRENT – pA

2

–35 –15 5 25 45 65

TEMPERATURE – ⴗC

Figure 5. Input Bias Current vs.
Temperature

VS = 5V

= 2.5V

V

500

400

300

200

QUANTITY – Amplifiers

100

–12

–10 –8 –6 –4 –2 0 2 4

INPUT OFFSET VOLTAGE – mV

T

CM

= 25ⴗC

A

Figure 3. Input Offset Voltage
Distribution

VS = 5V

T

= 25ⴗC

A

8

7

6

5

4

3

2

INPUT BIAS CURRENT – pA

1

85

01234 5

COMMON-MODE VOLTAGE – Volts

Figure 6. Input Bias Current vs.
Common-Mode Voltage

–2

–3

–4

–5

–6

–7

INPUT OFFSET VOLTAGE – mV

–8

–35 –15 5 25 45 65

TEMPERATURE – ⴗC

Figure 4. Input Offset Voltage
vs. Temperature

6

VS = 5V, 3V

5

V

= VS/2

CM

4

3

2

1

0

INPUT OFFSET CURRENT – pA

–1

–2

–35 –15 5 25 45 65 85

TEMPERATURE – ⴗC

Figure 7. Input Offset Current vs.
Temperature

VS = 5V

V

= 2.5V

CM

85

1000

VS = 2.7V

TA = 25ⴗC

100

SOURCE

10

1

⌬OUTPUT VOLTAGE – mV

0.1

0.01 0.1 1000110100
LOAD CURRENT – mA

SINK

Figure 8. Output Voltage to Supply
Rail vs. Load Current

10000

VS = 5V

T

= 25ⴗC

A

1000

100

10

⌬OUTPUT VOLTAGE – mV

1

0.01

0.01 0.1 1000110100

SOURCE

SINK

LOAD CURRENT – mA

Figure 9. Output Voltage to Supply
Rail vs. Load Current

VS = 2.7V

R

= NO LOAD

L

T

= 25ⴗC

A

80

60

40

20

GAIN – dB

0

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

FREQUENCY – Hz

Figure 10. Open-Loop Gain and
Phase vs. Frequency

rees

45

90

135

180

PHASE SHIFT – De

REV. D

–5–