Analog Devices AD8544, AD8542, AD8541 Datasheet

General Purpose CMOS

a

FEATURES
Single Supply Operation: +2.7 V to +5.5 V
Low Supply Current: 45 ␮A/Amplifier
Wide Bandwidth: 1 MHz
No Phase Reversal
Low Input Currents: 4 pA
Unity Gain Stable
Rail-to-Rail Input and Output

APPLICATIONS
ASIC Input or Output Amplifier
Sensor Interface
Piezo Electric Transducer Amplifier
Medical Instrumentation
Mobile Communication
Audio Output
Portable Systems

GENERAL DESCRIPTION

The AD8541/AD8542/AD8544 are single, dual and quad rail­to-rail input and output single supply amplifiers featuring very
low supply current and 1 MHz bandwidth. All are guaranteed to
operate from a +2.7 V single supply as well as a +5 V supply.
These parts provide 1 MHz bandwidth at low current consump­tion of 45 µA per amplifier.

Very low input bias currents enable the AD8541/AD8542/AD8544
to be used for integrators, photodiode amplifiers, piezo electric
sensors and other applications with high source impedance. Supply
current is only 45 µA per amplifier, ideal for battery operation.

Rail-to-rail inputs and outputs are useful to designers buffering
ASICs in single supply systems. The AD8541/AD8542/AD8544
are optimized to maintain high gains at lower supply voltages,
making them useful for active filters and gain stages.

The AD8541/AD8542/AD8544 are specified over the extended
industrial (–40°C to +125°C) temperature range. The AD8541
is available in 8-lead SO and 5-lead SOT-23 packages. The
AD8542 is available in 8-lead SO, 8-lead MSOP, and 8-lead
TSSOP surface mount packages. The AD8544 is available in
14-lead narrow SO-14 and 14-lead TSSOP surface mount pack­ages. All TSSOP, MSOP, and SOT versions are available in tape
and reel only.

Rail-to-Rail Amplifiers

AD8541/AD8542/AD8544

PIN CONFIGURATIONS

SO-8 (R) SOT-23-5 (RT)

Vⴚ

V+

1

2

3

1

2

3

4

5

6

7

AD8541

AD8544

5

4

14

13

12

11

10

V+

ⴚIN A

9

8

OUT D

ⴚIN D

+IN D

Vⴚ

+IN C

ⴚIN C

OUT C

NC

1

ⴚIN A

2

+IN A

3

Vⴚ

4

NC = NO CONNECT

AD8541

8

7

6

5

NC

V+

OUT A

NC

OUT A

+IN A

SO-8 (R), RM-8, and RU-8 SO-14 (R) and RU-14

OUT A

ⴚIN A

+IN A

Vⴚ

1

2

3

4

AD8542

8

7

6

5

V+

OUT B

ⴚIN B

+IN B

OUT A

ⴚIN A

+IN A

+IN B

ⴚIN B

OUT B

REV. A

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reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.

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Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 2000

AD8541/AD8542/AD8544–SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

(VS = +2.7 V, VCM = +1.35 V, TA = +25ⴗC unless otherwise noted)

Parameter Symbol Conditions Min Typ Max Units

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

–40°C ≤ T
–40°C ≤ T

≤ +125°C7mV

A

≤ +85°C 100 pA

A

≤ +125°C 1,000 pA

A

≤ +85°C50pA

A

≤ +125°C 500 pA

A

16 mV

460 pA

0.1 30 pA

Input Voltage Range 0 +2.7 V
Common-Mode Rejection Ratio CMRR V

Large Signal Voltage Gain A

Offset Voltage Drift ∆V
Bias Current Drift ∆I

VO

/∆T –40°C ≤ TA ≤ +125°C4µV/°C

OS

/∆T –40°C ≤ TA ≤ +85°C 100 fA/°C

B

= 0 V to +2.7 V 40 45 dB

CM

–40°C ≤ T

≤ +125°C38 dB

A

RL = 100 kΩ , VO = +0.5 V to +2.2 V 100 500 V/mV
–40°C ≤ T
–40°C ≤ T

–40°C ≤ T

≤ +85°C 50 V/mV

A

≤ +125°C 2 V/mV

A

≤ +125°C 2,000 fA/°C

A

Offset Current Drift ∆IOS/∆T –40°C ≤ TA ≤ +125°C 25 fA/°C

OUTPUT CHARACTERISTICS

Output Voltage High V

Output Voltage Low V

Output Current I

Closed Loop Output Impedance Z

OUT

±I

OH

OL

SC

OUT

IL = 1 mA +2.575 +2.65 V
–40°C ≤ T

≤ +125°C +2.550 V

A

IL = 1 mA 35 100 mV
–40°C ≤ T
V

OUT

≤ +125°C 125 mV

A

= VS – 1 V 15 mA

±20 mA

f = 200 kHz, AV = 1 50 Ω

POWER SUPPLY

Power Supply Rejection Ratio PSRR VS = +2.5 V to +6 V 65 76 dB

Supply Current/Amplifier I

SY

–40°C ≤ T
VO = 0 V 38 55 µA

≤ +125°C60 dB

A

–40°C ≤ TA ≤ +125°C75µA

DYNAMIC PERFORMANCE

Slew Rate SR RL = 100 kΩ 0.4 0.75 V/µs
Settling Time t

S

To 0.1% (1 V Step) 5 µs

Gain Bandwidth Product GBP 980 kHz
Phase Margin Φo 63 Degrees

NOISE PERFORMANCE

Voltage Noise Density e

Current Noise Density i

Specifications subject to change without notice.

n

e

n

n

f = 1 kHz 40 nV/√Hz
f = 10 kHz 38 nV/√Hz

<0.1 pA/√Hz

–2–

REV. A

AD8541/AD8542/AD8544

ELECTRICAL CHARACTERISTICS

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

Parameter Symbol Conditions Min Typ Max Units

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

–40°C ≤ T
–40°C ≤ T

≤ +125°C7mV

A

≤ +85°C 100 pA

A

≤ +125°C 1,000 pA

A

≤ +85°C50pA

A

≤ +125°C 500 pA

A

16 mV

460 pA

0.1 30 pA

Input Voltage Range 0+3V
Common-Mode Rejection Ratio CMRR V

Large Signal Voltage Gain A

Offset Voltage Drift ∆V
Bias Current Drift ∆I

VO

/∆T –40°C ≤ TA ≤ +125°C4µV/°C

OS

/∆T –40°C ≤ TA ≤ +85°C 100 fA/°C

B

= 0 V to +3 V 40 45 dB

CM

–40°C ≤ T

≤ +125°C38 dB

A

RL = 100 kΩ , VO = +0.5 V to +2.2 V 100 500 V/mV
–40°C ≤ T
–40°C ≤ T

–40°C ≤ T

≤ +85°C 50 V/mV

A

≤ +125°C 2 V/mV

A

≤ +125°C 2,000 fA/°C

A

Offset Current Drift ∆IOS/∆T –40°C ≤ TA ≤ +125°C 25 fA/°C

OUTPUT CHARACTERISTICS

Output Voltage High V

Output Voltage Low V

Output Current I

Closed Loop Output Impedance Z

OUT

±I

OH

OL

SC

OUT

IL = 1 mA +2.875 +2.955 V
–40°C ≤ T

≤ +125°C +2.850 V

A

IL = 1 mA 32 100 mV
–40°C ≤ T
V

OUT

≤ +125°C 125 mV

A

= VS – 1 V 18 mA

±25 mA

f = 200 kHz, AV = 1 50 Ω

POWER SUPPLY

Power Supply Rejection Ratio PSRR VS = +2.5 V to +6 V 65 76 dB

≤ +125°C60 dB

A

Supply Current/Amplifier I

SY

–40°C ≤ T
VO = 0 V 40 60 µA
–40°C ≤ TA ≤ +125°C75µA

DYNAMIC PERFORMANCE

Slew Rate SR RL = 100 kΩ 0.4 0.8 V/µs
Settling Time t

S

To 0.01% (1 V Step) 5 µs

Gain Bandwidth Product GBP 980 kHz
Phase Margin Φo 64 Degrees

NOISE PERFORMANCE

Voltage Noise Density e

Current Noise Density i

Specifications subject to change without notice.

n

e

n

n

f = 1 kHz 42 nV/√Hz
f = 10 kHz 38 nV/√Hz

<0.1 pA/√Hz

–3–REV. A

AD8541/AD8542/AD8544–SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

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

Parameter Symbol Conditions Min Typ Max Units

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

–40°C ≤ T
–40°C ≤ T

≤ +125°C7mV

A

≤ +85°C 100 pA

A

≤ +125°C 1,000 pA

A

≤ +85°C50pA

A

≤ +125°C 500 pA

A

16 mV

460 pA

0.1 30 pA

Input Voltage Range 0+5V
Common-Mode Rejection Ratio CMRR V

Large Signal Voltage Gain A

Offset Voltage Drift ∆V
Bias Current Drift ∆I

VO

/∆T –40°C ≤ TA ≤ +125°C4µV/°C

OS

/∆T –40°C ≤ TA ≤ +85°C 100 fA/°C

B

= 0 V to +5 V 40 48 dB

CM

–40°C ≤ T

≤ +125°C38 dB

A

RL = 100 kΩ , VO = +0.5 V to +2.2 V 20 40 V/mV
–40°C ≤ T
–40°C ≤ T

–40°C ≤ T

≤ +85°C 10 V/mV

A

≤ +125°C 2 V/mV

A

≤ +125°C 2,000 fA/°C

A

Offset Current Drift ∆IOS/∆T –40°C ≤ TA ≤ +125°C 25 fA/°C

OUTPUT CHARACTERISTICS

Output Voltage High V

Output Voltage Low V

Output Current I

Closed Loop Output Impedance Z

OUT

±I

OH

OL

SC

OUT

IL = 1 mA +4.9 +4.965 V
–40°C ≤ T

≤ +125°C +4.875 V

A

IL = 1 mA 25 100 mV
–40°C ≤ T
V

OUT

≤ +125°C 125 mV

A

= VS – 1 V 30 mA

±60 mA

f = 200 kHz, AV = 1 45 Ω

POWER SUPPLY

Power Supply Rejection Ratio PSRR VS = +2.5 V to +6 V 65 76 dB

Supply Current/Amplifier I

SY

–40°C ≤ T
VO = 0 V 45 65 µA

≤ +125°C60 dB

A

–40°C ≤ TA ≤ +125°C85µA

DYNAMIC PERFORMANCE

Slew Rate SR RL = 100 kΩ, CL = 200 pF 0.45 0.92 V/µs
Full-Power Bandwidth BW
Settling Time t

S

P

1% Distortion 70 kHz
To 0.1% (1 V Step) 6 µs

Gain Bandwidth Product GBP 1,000 kHz
Phase Margin Φo 67 Degrees

NOISE PERFORMANCE

Voltage Noise Density e

Current Noise Density i

Specifications subject to change without notice.

n

e

n

n

f = 1 kHz 42 nV/√Hz
f = 10 kHz 38 nV/√Hz

<0.1 pA/√Hz

–4–

REV. A