ANALOG DEVICES AD8031 Service Manual

2.7 V, 800 μA, 80 MHz

–

V

FEATURES

Low power

Supply current 800 μA/amplifier Fully specified at +2.7 V, +5 V, and ±5 V supplies

High speed and fast settling on 5 V

80 MHz, −3 dB bandwidth (G = +1) 30 V/μs slew rate 125 ns settling time to 0.1%

Rail-to-rail input and output

No phase reversal with input 0.5 V beyond supplies Input CMVR extends beyond rails by 200 mV Output swing to within 20 mV of either rail

Low distortion

−62 dB @ 1 MHz, V

−86 dB @ 100 kHz, V Output current: 15 mA High grade option: VOS (maximum) = 1.5 mV

APPLICATIONS

High speed, battery-operated systems High component density systems Portable test instruments A/D buffers Active filters High speed, set-and-demand amplifiers

GENERAL DESCRIPTION

= 2 V p-p

O

= 4.6 V p-p

O

Rail-to-Rail I/O Amplifiers

AD8031/AD8032

CONNECTION DIAGRAMS

1

NC

–IN

+IN

V

–

2

+

3

4

AD8031

S

NC = NO CONNECT

Figure 1. 8-Lead PDIP (N) and

SOIC_N (R)

OUT

–V

+IN

NC

8

7

6

5

+V

OUT

NC

OUT1

–IN1

S

+IN1

–V

S

01056-001

Figure 2. 8-Lead PDIP (N),

SOIC_N (R), and MSOP (RM)

AD8031

1

2

S

3

–

+

Figure 3. 5-Lead SOT-23 (RJ-5)

Operating on supplies from +2.7 V to +12 V and dual supplies up to ±6 V, the AD8031/AD8032 are ideal for a wide range of applications, from battery-operated systems with large bandwidth requirements to high speed systems where component density requires lower power dissipation. The AD8031/AD8032 are available in 8-lead PDIP and 8-lead SOIC_N packages and operate over the industrial temperature range of −40°C to +85°C. The AD8031A is also available in the space-saving 5-lead SOT-23 package, and the AD8032A is available in an 8-lead MSOP package.

VIN=4.85Vp-p

AD8032

1

2

3

4

+V

5

S

–IN

4

+–

01056-003

8

+V

S

7

OUT2

6

–IN2

5

+IN2

01056-002

V

=4.65Vp-p

OUT

G=+1

The AD8031 (single) and AD8032 (dual) single-supply, voltage feedback amplifiers feature high speed performance with 80 MHz of small signal bandwidth, 30 V/µs slew rate, and 125 ns settling time. This performance is possible while consuming less than 4.0 mW of power from a single 5 V supply. These features increase the operation time of high speed, battery-powered systems without compromising dynamic performance.

The products have true single-supply capability with rail-to-rail input and output characteristics and are specified for +2.7 V, +5 V, and ±5 V supplies. The input voltage range can extend to 500 mV beyond each rail. The output voltage swings to within 20 mV of each rail providing the maximum output dynamic range.

The AD8031/AD8032 also offer excellent signal quality for only 800 µA of supply current per amplifier; THD is −62 dBc with a 2 V p-p, 1 MHz output signal, and –86 dBc for a 100 kHz,

4.6 V p-p signal on +5 V supply. The low distortion and fast settling time make them ideal as buffers to single-supply ADCs.

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. 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.

1V/DIV

2µs/DIV

1V/DI

01056-004

2µs/DIV

Figure 4. Input VIN Figure 5. Output V

+5V

–

V

IN

+

1kΩ 1.7pF

V

OUT

+2.5V

Figure 6. Rail-to-Rail Performance at 100 kHz

01056-005

OUT

01056-006

AD8031/AD8032

REVISION HISTORY

Input Stage Operation ................................................................ 13

Overdriving the Input Stage ...................................................... 13

Output Stage, Open-Loop Gain and Distortion vs. Clearance

from Power Supply ..................................................................... 14

Output Overdrive Recovery ...................................................... 14

Driving Capacitive Loads .......................................................... 15

Applications ..................................................................................... 16

A 2 MHz Single-Supply, Biquad Band-Pass Filter ................. 16

High Performance, Single-Supply Line Driver........................... 16

Outline Dimensions ....................................................................... 18

Ordering Guide .......................................................................... 20

11/08—Rev. C to Rev. D

Change to Table 3 Column Heading .............................................. 5

Change to Ordering Guide ............................................................ 20

7/06—Rev. B to Rev. C

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

Updated Outline Dimensions ....................................................... 18

Change to Ordering Guide ............................................................ 20

9/99—Rev. A to Rev. B

Rev. D | Page 2 of 20

AD8031/AD8032

SPECIFICATIONS

+2.7 V SUPPLY

@ TA = 25°C, VS = 2.7 V, RL = 1 k to 1.35 V, RF = 2.5 k, unless otherwise noted.

Table 1.

AD8031A/AD8032A AD8031B/AD8032B Parameter Conditions Min Typ Max Min Typ Max Unit

DYNAMIC PERFORMANCE

–3 dB Small Signal Bandwidth G = +1, VO < 0.4 V p-p 54 80 54 80 MHz Slew Rate G = −1, VO = 2 V step 25 30 25 30 V/µs Settling Time to 0.1% G = −1, VO = 2 V step, CL = 10 pF 125 125 ns

DISTORTION/NOISE PERFORMANCE

Total Harmonic Distortion fC = 1 MHz, VO = 2 V p-p, G = +2 −62 −62 dBc f Input Voltage Noise f = 1 kHz 15 15 nV/√Hz Input Current Noise f = 100 kHz 2.4 2.4 pA/√Hz f = 1 kHz 5 5 pA/√Hz Crosstalk (AD8032 Only) f = 5 MHz −60 −60 dB

DC PERFORMANCE

Input Offset Voltage VCM = VCC/2; V T Offset Drift VCM = VCC/2; V Input Bias Current VCM = VCC/2; V T Input Offset Current 50 500 50 500 nA

Open-Loop Gain VCM = VCC/2; V T INPUT CHARACTERISTICS

Common-Mode Input Resistance 40 40 MΩ

Differential Input Resistance 280 280 kΩ

Input Capacitance 1.6 1.6 pF

Input Voltage Range

Input Common-Mode Voltage Range

Common-Mode Rejection Ratio VCM = 0 V to 2.7 V 46 64 46 64 dB V

Differential Input Voltage 3.4 3.4 V OUTPUT CHARACTERISTICS

Output Voltage Swing Low RL = 10 kΩ 0.05 0.02 0.05 0.02 V

Output Voltage Swing High 2.6 2.68 2.6 2.68 V

Output Voltage Swing Low RL = 1 kΩ 0.15 0.08 0.15 0.08 V

Output Voltage Swing High 2.55 2.6 2.55 2.6 V

Output Current 15 15 mA

Short Circuit Current Sourcing 21 21 mA

Sinking −34 −34 mA

Capacitive Load Drive G = +2 (See Figure 46) 15 15 pF POWER SUPPLY

Operating Range 2.7 12 2.7 12 V

Quiescent Current per Amplifier 750 1250 750 1250 A

Power Supply Rejection Ratio

= 100 kHz, VO = 2 V p-p, G = +2 −86 −86 dBc

C

= 135 V ±1 ±6 ±0.5 ±1.5 mV

OUT

to T

MIN

CM

− = 0 V to −1 V or

V

S

+ = +2.7 V to +3.7 V

V

S

±6 ±10 ±1.6 ±2.5 mV

MAX

= 135 V 10 10 µV/°C

OUT

= 135 V 0.45 2 0.45 2 µA

OUT

to T

2.2 2.2 µA

MAX

= 0.35 V to 2.35 V 76 80 76 80 dB

OUT

to T

74 74 dB

MAX

−0.5 to +3.2

−0.2 to +2.9

−0.5 to +3.2

−0.2 to +2.9

V

= 0 V to 1.55 V 58 74 58 74 dB

75 86 75 86 dB

Rev. D | Page 3 of 20

AD8031/AD8032

+5 V SUPPLY

= 25°C, VS = 5 V, RL = 1 k to 2.5 V, RF = 2.5 kΩ, unless otherwise noted.

@ T

A

Table 2.

AD8031A/AD8032A AD8031B/AD8032B Parameter Conditions Min Typ Max Min Typ Max Unit

DYNAMIC PERFORMANCE

−3 dB Small Signal Bandwidth G = +1, VO < 0.4 V p-p 54 80 54 80 MHz Slew Rate G = −1, VO = 2 V step 27 32 27 32 V/µs Settling Time to 0.1% G = −1, VO = 2 V step, CL = 10 pF 125 125 ns

DISTORTION/NOISE PERFORMANCE

Total Harmonic Distortion fC = 1 MHz, VO = 2 V p-p, G = +2 −62 −62 dBc f Input Voltage Noise f = 1 kHz 15 15 nV/√Hz Input Current Noise f = 100 kHz 2.4 2.4 pA/√Hz f = 1 kHz 5 5 pA/√Hz Differential Gain RL = 1 kΩ 0.17 0.17 % Differential Phase RL = 1 kΩ 0.11 0.11 Degrees Crosstalk (AD8032 Only) f = 5 MHz −60 −60 dB

DC PERFORMANCE

Input Offset Voltage VCM = VCC/2; V T Offset Drift VCM = VCC/2; V Input Bias Current VCM = VCC/2; V T Input Offset Current 50 350 50 250 nA

Open-Loop Gain VCM = VCC/2; V T INPUT CHARACTERISTICS

Common-Mode Input Resistance 40 40 MΩ

Differential Input Resistance 280 280 kΩ

Input Capacitance 1.6 1.6 pF

Input Voltage Range

Input Common-Mode Voltage Range

Common-Mode Rejection Ratio VCM = 0 V to 5 V 56 70 56 70 dB

V

Differential Input Voltage 3.4 3.4 V OUTPUT CHARACTERISTICS

Output Voltage Swing Low RL = 10 kΩ 0.05 0.02 0.05 0.02 V

Output Voltage Swing High 4.95 4.98 4.95 4.98 V

Output Voltage Swing Low RL = 1 kΩ 0.2 0.1 0.2 0.1 V

Output Voltage Swing High 4.8 4.9 4.8 4.9 V

Output Current 15 15 mA

Short Circuit Current Sourcing 28 28 mA

Sinking −46 −46 mA

Capacitive Load Drive G = +2 (See Figure 46) 15 15 pF POWER SUPPLY

Operating Range 2.7 12 2.7 12 V

Quiescent Current per Amplifier 800 1400 800 1400 µA

Power Supply Rejection Ratio

= 100 kHz, VO = 2 V p-p, G = +2 −86 −86 dBc

C

= 2.5 V ±1 ±6 ±0.5 ±1.5 mV

OUT

to T

MIN

CM

− = 0 V to −1 V or

V

S

+ = +5 V to +6 V

V

S

±6 ±10 ±1.6 ±2.5 mV

MAX

= 2.5 V 5 5 µV/°C

OUT

= 2.5 V 0.45 1.2 0.45 1.2 µA

OUT

to T

2.0 2.0 µA

MAX

= 1.5 V to 3.5 V 76 82 76 82 dB

OUT

to T

74 74 dB

MAX

−0.5 to +5.5

−0.2 to +5.2

−0.5 to +5.5

−0.2 to +5.2

V

= 0 V to 3.8 V 66 80 66 80 dB

75 86 75 86 dB

Rev. D | Page 4 of 20

AD8031/AD8032

±5 V SUPPLY

= 25°C, VS = ±5 V, RL = 1 kΩ to 0 V, RF = 2.5 kΩ, unless otherwise noted.

@ T

A

Table 3.

AD8031A/AD8032A AD8031B/AD8032B Parameter Conditions Min Typ Max Min Typ Max Unit

DYNAMIC PERFORMANCE

−3 dB Small Signal Bandwidth G = +1, VO < 0.4 V p-p 54 80 54 80 MHz Slew Rate G = −1, VO = 2 V step 30 35 30 35 V/µs Settling Time to 0.1% G = −1, VO = 2 V step, CL = 10 pF 125 125 ns

DISTORTION/NOISE PERFORMANCE

Total Harmonic Distortion fC = 1 MHz, VO = 2 V p-p, G = +2 −62 −62 dBc f Input Voltage Noise f = 1 kHz 15 15 nV/√Hz Input Current Noise f = 100 kHz 2.4 2.4 pA/√Hz f = 1 kHz 5 5 pA/√Hz Differential Gain RL = 1 kΩ 0.15 0.15 % Differential Phase RL = 1 kΩ 0.15 0.15 Degrees Crosstalk (AD8032 Only) f = 5 MHz −60 −60 dB

DC PERFORMANCE

Input Offset Voltage VCM = 0 V; V T Offset Drift VCM = 0 V; V Input Bias Current VCM = 0 V; V T Input Offset Current 50 350 50 250 nA Open-Loop Gain VCM = 0 V; V T

INPUT CHARACTERISTICS

Common-Mode Input Resistance 40 40 MΩ Differential Input Resistance 280 280 kΩ Input Capacitance 1.6 1.6 pF Input Voltage Range

Input Common-Mode Voltage Range

Common-Mode Rejection Ratio VCM = −5 V to +5 V 60 80 60 80 dB V Differential/Input Voltage 3.4 3.4 V

OUTPUT CHARACTERISTICS

Output Voltage Swing Low RL = 10 kΩ −4.94 −4.98 −4.94 −4.98 V Output Voltage Swing High +4.94 +4.98 +4.94 +4.98 V Output Voltage Swing Low RL = 1 kΩ −4.7 −4.85 −4.7 −4.85 V Output Voltage Swing High +4.7 +4.75 +4.7 +4.75 V Output Current 15 15 mA Short Circuit Current Sourcing 35 35 mA Sinking −50 −50 mA Capacitive Load Drive G = +2 (See Figure 46) 15 15 pF

POWER SUPPLY

Operating Range ±1.35 ±6 ±1.35 ±6 V Quiescent Current per Amplifier 900 1600 900 1600 µA Power Supply Rejection Ratio

= 100 kHz, VO = 2 V p-p, G = +2 −86 −86 dBc

C

= 0 V ±1 ±6 ±0.5 ±1.5 mV

OUT

to T

MIN

CM

− = −5 V to −6 V or

V

S

+ = +5 V to +6 V

V

S

±6 ±10 ±1.6 ±2.5 mV

MAX

= 0 V 5 5 µV/°C

OUT

= 0 V 0.45 1.2 0.45 1.2 µA

OUT

to T

2.0 2.0 µA

MAX

= ±2 V 76 80 76 80 dB

OUT

to T

74 74 dB

MAX

−5.5 to +5.5

−5.2 to +5.2

−5.5 to +5.5

−5.2 to +5.2

V

= −5 V to +3.5 V 66 90 66 90 dB

76 86 76 86 dB

Rev. D | Page 5 of 20

AD8031/AD8032

ABSOLUTE MAXIMUM RATINGS

Table 4.

Parameter Rating

Supply Voltage 12.6 V Internal Power Dissipation1

8-Lead PDIP (N) 1.3 W

8-Lead SOIC_N (R) 0.8 W

8-Lead MSOP (RM) 0.6 W

5-Lead SOT-23 (RJ) 0.5 W Input Voltage (Common Mode) ±VS ± 0.5 V Differential Input Voltage ±3.4 V Output Short-Circuit Duration

Observe Power

Derating Curves Storage Temperature Range (N, R, RM, RJ) −65°C to +125°C Lead Temperature (Soldering 10 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.

MAXIMUM POWER DISSIPATION

The maximum power that can be safely dissipated by the AD8031/AD8032 is limited by the associated rise in junction temperature. The maximum safe junction temperature for plastic encapsulated devices is determined by the glass transition temperature of the plastic, approximately 150°C. Exceeding this limit temporarily can cause a shift in 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.

While the AD8031/AD8032 are internally short-circuit protected, this may not be sufficient to guarantee that the maximum junction temperature (150°C) is not exceeded under all conditions. To ensure proper operation, it is necessary to observe the maximum power derating curves shown in Figure 7.

2.0

1.5

8-LEAD PDIP

8-LEAD SOIC

TJ = +150°C

1

Specification is for the device in free air:

8-Lead PDIP: θJA = 90°C/W. 8-Lead SOIC_N: θJA = 155°C/W. 8-Lead MSOP: θJA = 200°C/W. 5-Lead SOT-23: θJA = 240°C/W.

MAXIMUM POW ER DISSIPAT ION (W)

8-LEAD MSOP

1.0

0.5

0

–50 –40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90

Figure 7. Maximum Power Dissipation vs. Temperature

5-LEAD SOT-23

AMBIENT TEMPERATURE (°C)

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.

01056-007

Rev. D | Page 6 of 20

ANALOG DEVICES AD8031 Service Manual

FEATURES

APPLICATIONS

GENERAL DESCRIPTION

CONNECTION DIAGRAMS

TABLE OF CONTENTS

REVISION HISTORY

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

MAXIMUM POWER DISSIPATION

ESD CAUTION