ANALOG DEVICES ADA4860-1 Service Manual

High Speed, Low Cost,

V

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FEATURES

High speed

800 MHz, −3 dB bandwidth 790 V/μs slew rate

8 ns settling time to 0.5% Wide supply range: 5 V to 12 V Low power: 6 mA

0.1 dB flatness: 125 MHz Differential gain: 0.02% Differential phase: 0.02° Low voltage offset: 3.5 mV (typ) High output current: 25 mA Power down

APPLICATIONS

Consumer video Professional video Broadband video ADC buffers Active filters

GENERAL DESCRIPTION

The ADA4860-1 is a low cost, high speed, current feedback op amp that provides excellent overall performance. The 800 MHz,

−3 dB bandwidth, and 790 V/μs slew rate make this amplifier well suited for many high speed applications. With its combination of low price, excellent differential gain (0.02%), differential phase (0.02°), and 0.1 dB flatness out to 125 MHz, this amplifier is ideal for both consumer and professional video applications.

The ADA4860-1 is designed to operate on supply voltages as

w as +5 V and up to ±5 V using only 6 mA of supply current.

lo To further reduce power consumption, the amplifier is equipped with a power-down feature that lowers the supply current to 0.25 mA.

The ADA4860-1 is available in a 6-lead SOT-23 package and

ned to work over the extended temperature range of

is desig

−40°C to +105°C.

Op Amp

ADA4860-1

PIN CONFIGURATION

1

OUT

–V

2

S

3

+IN

Figure 1. 6-Lead SOT-23 (RJ-6)

6.3 G = +2

6.2

V

= 2V p-p

OUT

R

= RG = 499Ω

F

6.1

6.0

5.9

5.8

5.7

5.6

CLOSED-LOOP GAIN (dB)

5.5

5.4

5.3

0.1 1 10 100 1000

Figure 2. 0.1 dB Flatness

6

+V

S

5

+–

FREQUENCY (MHz )

POWER DOW N

4

–IN

VS = +5V

5709-001

= ±5V

V

S

05709-003

Rev. 0

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.

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REVISION HISTORY

4/06—Revision 0: Initial Version

Feedback Resistor Selection...................................................... 14

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

Power Down Pin......................................................................... 15

Video Amplifier.......................................................................... 15

Single-Supply Operation........................................................... 15

Optimizing Flatness and Bandwidth....................................... 16

Layout and Circuit Board Parasitics........................................ 17

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

Ordering Guide .......................................................................... 18

Rev. 0 | Page 2 of 20

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SPECIFICATIONS

VS = +5 V (@ TA = 25°C, G = +2, RL = 150 Ω referred to midsupply, CL = 4 pF, unless otherwise noted). For G = +2, RF = RG = 499 Ω and for G = +1, R

Table 1.

Parameter Conditions Min Typ Max Unit

DYNAMIC PERFORMANCE

–3 dB Bandwidth VO = 0.2 V p-p 460 MHz V V G = +1, VO = 0.2 V p-p 650 MHz

Bandwidth for 0.1 dB Flatness VO = 2 V p-p 58 MHz

V

+Slew Rate (Rising Edge) VO = 2 V p-p 695 V/μs

−Slew Rate (Falling Edge) VO = 2 V p-p 560 V/μs

Settling Time to 0.5% VO = 2 V step 8 ns NOISE/DISTORTION PERFORMANCE

Harmonic Distortion HD2/HD3 fC = 1 MHz, VO = 2 V p-p −90/−102 dBc

f

Input Voltage Noise f = 100 kHz 4.0 nV/√Hz

Input Current Noise f = 100 kHz, +IN/−IN 1.5/7.7 pA/√Hz

Differential Gain RL = 150 Ω 0.02 %

Differential Phase RL = 150 Ω 0.03 Degrees DC PERFORMANCE

Input Offset Voltage −13 −4.25 +13 mV

+Input Bias Current

−Input Bias Current −7 +1.0 +10 μA

Open-Loop Transresistance 400 650 kΩ INPUT CHARACTERISTICS

Input Resistance +IN 10 MΩ

−IN 85 Ω

Input Capacitance +IN 1.5 pF

Input Common-Mode Voltage Range 1.2 to 3.7 V

Common-Mode Rejection Ratio VCM = 2 V to 3 V −52 −56 dB POWER DOWN PIN

Input Voltage Enabled 0.5 V

Power down 1.8 V

Bias Current Enabled −200 nA

Power down 60 μA

Turn-On Time 200 ns

Turn-Off Time 3.5 μs OUTPUT CHARACTERISTICS

Output Overdrive Recovery Time (Rise/Fall) VIN = +2.25 V to −0.25 V 60/100 ns

Output Voltage Swing RL = 75 Ω 1.2 to 3.8 V

R

Short-Circuit Current Sinking and sourcing 45 mA POWER SUPPLY

Operating Range 5 12 V

Total Quiescent Current Enabled 4.5 5.2 6.5 mA

Quiescent Current POWER DOWN pin = +VS 0.2 0.5 mA

Power Supply Rejection Ratio

+PSR +VS = 4 V to 6 V, −VS = 0 V −60 −62 dB

= 550 Ω.

F

= 2 V p-p 165 MHz

O

= 0.2 V p-p, RL = 75 Ω 430 MHz

O

= 2 V p-p, RL = 75 Ω 45 MHz

O

= 5 MHz, VO = 2 V p-p −70/−76 dBc

C

−2 −1 +1 μA

= 150 Ω 1.2 to 3.8 1 to 4 V

L

= 1 kΩ 0.9 to 4.1 0.8 to 4.2 V

L

Rev. 0 | Page 3 of 20

ADA4860-1

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VS = ±5 V (@ TA = 25°C, G = +2, RL = 150 Ω, CL = 4 pF, unless otherwise noted). For G = +2, RF = RG = 499 Ω and for G = +1, RF = 550 Ω.

Table 2.

Parameter Conditions Min Typ Max Unit

DYNAMIC PERFORMANCE

–3 dB Bandwidth VO = 0.2 V p-p 520 MHz

V

V G = +1, VO = 0.2 V p-p 800 MHz Bandwidth for 0.1 dB Flatness VO = 2 V p-p 125 MHz V +Slew Rate (Rising Edge) VO = 2 V p-p 980 V/μs

−Slew Rate (Falling Edge) VO = 2 V p-p 790 V/μs Settling Time to 0.5% VO = 2 V step 8 ns

NOISE/DISTORTION PERFORMANCE

Harmonic Distortion HD2/HD3 fC = 1 MHz, VO = 2 V p-p −90/−102 dBc f Input Voltage Noise f = 100 kHz 4.0 nV/√Hz Input Current Noise f = 100 kHz, +IN/−IN 1.5/7.7 pA/√Hz Differential Gain RL = 150 Ω 0.02 % Differential Phase RL = 150 Ω 0.02 Degrees

DC PERFORMANCE

Input Offset Voltage −13 −3.5 +13 mV +Input Bias Current

−Input Bias Current −7 +1.5 +10 μA Open-Loop Transresistance 400 700 kΩ

INPUT CHARACTERISTICS

Input Resistance +IN 12 MΩ

−IN 90 Ω Input Capacitance +IN 1.5 pF Input Common-Mode Voltage Range −3.8 to +3.7 V Common-Mode Rejection Ratio VCM = ±2 V −55 −58 dB

POWER DOWN PIN

Input Voltage Enabled −4.4 V Power down −3.2 V Bias Current Enabled −250 nA Power down 130 μA Turn-On Time 200 ns Turn-Off Time 3.5 μs

OUTPUT CHARACTERISTICS

Output Overdrive Recovery Time (Rise/Fall) VIN = ±3.0 V 45/90 ns Output Voltage Swing RL = 75 Ω ±2 V R R Short-Circuit Current Sinking and sourcing 85 mA

POWER SUPPLY

Operating Range 5 12 V Total Quiescent Current Enabled 5 6 8 mA Quiescent Current POWER DOWN pin = +VS 0.25 0.5 mA Power Supply Rejection Ratio

+PSR +VS = +4 V to +6 V, −VS = −5 V −62 −64 dB

−PSR

= 2 V p-p 230 MHz

O

= 0.2 V p-p, RL = 75 Ω 480 MHz

O

= 2 V p-p, RL = 75 Ω 70 MHz

O

= 5 MHz, VO = 2 V p-p −77/−94 dBc

C

−2 −1.0 +1 μA

= 150 Ω ±2.5 ±3.1 V

L

= 1 kΩ ±3.9 ±4.1 V

L

= +5 V, −VS = −4 V to −6 V,

+V

S

POWER DOWN pin = −V

S

−58 −61 dB

Rev. 0 | Page 4 of 20

ADA4860-1

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ABSOLUTE MAXIMUM RATINGS

Table 3.

Parameter Rating

Supply Voltage 12.6 V Power Dissipation See Figure 3 Common-Mode Input Voltage −VS + 1 V to +VS − 1 V Differential Input Voltage ±VS Storage Temperature Range −65°C to +125°C Operating Temperature Range −40°C to +105°C Lead Temperature JEDEC J-STD-20 Junction Temperature 150°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, θJA is specified for device soldered in circuit board for surface-mount packages.

Table 4. Thermal Resistance

Package Type θJA Unit

6-lead SOT-23 170 °C/W

Maximum Power Dissipation

The maximum safe power dissipation for the ADA4860-1 is limited by the associated rise in junction temperature (T the die. At approximately 150°C, which is the glass transition temperature, the plastic changes its properties. Even temporarily exceeding this temperature limit can change the stresses that the package exerts on the die, permanently shifting the parametric performance of the amplifiers. Exceeding a junction temperature of 150°C for an extended period can result in changes in silicon devices, potentially causing degradation or loss of functionality.

) on

J

The power dissipated in the package (P resistor load is the total power consumed from the supply minus the load power.

= Total Power Consumed − Load Power

P

D

IVP

RMS output voltages should be considered.

Airflow across the ADA4860-1 helps remove heat from the

ackage, effectively reducing θ

p

. In addition, more metal

JA

directly in contact with the package leads and through holes under the device reduces θ

.

JA

Figure 3 shows the maximum safe power dissipation in the

ackage vs. the ambient temperature for the 6-lead SOT-23

p (170°C/W) on a JEDEC standard 4-layer board. θ approximations.

2.0

1.5

1.0

0.5

MAXIMUM POWER DISSIPATION (W)

0

–40 –30 –20 –10 0 110100908070605040302010

AMBIENT TEMPERAT URE (°C)

Figure 3. Maximum Power Dissipation vs. Temperature for a 4-Layer Board

) for a sine wave and a

D

V

OUT

)

CURRENTSUPPLYVOLTAGESUPPLY

–×=

R

L

JA

2

values are

05709-002

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.

Rev. 0 | Page 5 of 20

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TYPICAL PERFORMANCE CHARACTERISTICS

RL = 150 Ω and CL = 4 pF, unless otherwise noted.

2

1

VS = ±5V V

= 0.2V p-p

OUT

G = +1, RF = 550Ω

2

1

VS = 5V V

OUT

= 0.2V p-p

G = +1, RF = 550Ω

0

–1

–2

–3

NORMALIZED GAIN (dB)

–4

–5

–6

0.1 1 10 100 1000

G = +5, RF = 348Ω, RG = 86.6Ω

G = +10, R

= RG = 499Ω

G = +2, R

F

= RG = 499Ω

G = –1, R

F

= 348Ω, RG = 38.3Ω

F

FREQUENCY (MHz)

Figure 4. Small Signal Frequency Response for Various Gains

2

VS = ±5V V

= 2V p-p

OUT

1

0

G = +5, R

–1

–2

–3

NORMALIZED GAIN (dB)

–4

–5

–6

0.1 1 10 100 1000

G = +10, R

= 348Ω, RG = 86.6Ω

F

G = +2, R

= 348Ω, RG = 38.3Ω

F

FREQUENCY (MHz )

G = –1, RF = RG = 499Ω

= RG = 499Ω

F

G = +1, RF = 550Ω

Figure 5. Large Signal Frequency Response for Various Gains

6.3 G = +2

6.2

V

= 2V p-p

OUT

R

= RG = 499Ω

F

6.1

6.0

5.9

5.8

5.7

5.6

CLOSED-LOOP GAIN (dB)

5.5

5.4

5.3

0.1 1 10 100 1000

FREQUENCY (MHz )

VS = +5V

V

= ±5V

S

Figure 6. Large Signal 0.1 dB Flatness

0

–1

–2

–3

NORMALIZED GAIN (dB)

–4

–5

05709-008

–6

0.1 1 10 100 1000

G = +5, RF = 348Ω, RG = 86.6Ω

G = +10, R

= RG = 499Ω

G = +2, R

F

= RG = 499Ω

G = –1, R

F

= 348Ω, RG = 38.3Ω

F

FREQUENCY (MHz)

05709-007

Figure 7. Small Signal Frequency Response for Various Gains

2

VS = 5V V

= 2V p-p

OUT

1

0

–1

–2

–3

NORMALIZED GAIN (dB)

–4

–5

05709-012

–6

0.1 1 10 100 1000

G = +5, RF = 348Ω, RG = 86.6Ω

G = +2, RF = RG = 499Ω

G = +10, RF = 348Ω, RG = 38.3Ω

G = +1, RF = 550Ω

FREQUENCY (MHz)

G = –1, RF = RG = 499Ω

05709-013

Figure 8. Large Signal Frequency Response for Various Gains

7

6

5

4

3

2

CLOSED-LOOP GAIN (dB)

1

VS = ±5V G = +2 R

= RG = 499Ω

05709-003

F

0

0.1 1 10 100 1000

V

= 4V p-p

OUT

= 2V p-p

V

OUT

V

OUT

FREQUENCY (MHz)

= 1V p-p

05709-014

Figure 9. Large Signal Frequency Response for Various Output Levels

Rev. 0 | Page 6 of 20

ANALOG DEVICES ADA4860-1 Service Manual

FEATURES

APPLICATIONS

GENERAL DESCRIPTION

PIN CONFIGURATION

TABLE OF CONTENTS

REVISION HISTORY

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

THERMAL RESISTANCE

Maximum Power Dissipation

ESD CAUTION

TYPICAL PERFORMANCE CHARACTERISTICS