ANALOG DEVICES ADA4899-1 Service Manual

Unity-Gain Stable, Ultralow Distortion,

–

www.BDTIC.com/ADI

1 nV/√Hz Voltage Noise, High Speed Op Amp

FEATURES

Unity-gain stable Ultralow noise: 1 nV/√Hz, 2.6 pA/√Hz Ultralow distortion −117 dBc at 1 MHz High speed

−3 dB bandwidth: 600 MHz (G = +1)

Slew rate: 310 V/μs Offset voltage: 230 μV maximum Low input bias current: 100 nA Wide supply voltage range: 5 V to 12 V Supply current: 14.7 mA High performance pinout Disable mode

APPLICATIONS

Analog-to-digital drivers Instrumentation Filters IF and baseband amplifiers DAC buffers Optical electronics

ADA4899-1

CONNECTION DIAGRAMS

ADA4899-1

DISABLE

FEEDBACK

1

2

3

–IN

4

+IN

NC = NO CONNECT

Figure 1. 8-Lead LFCSP_VD (CP-8-2)

ADA4899-1

–V

–IN

+IN

1

2

3

4

S

FEEDBACK

Figure 2. 8-Lead SOIC_N_EP (RD-8-1)

8

+V

7

V

6

NC

5

–V

8

DISABLE

7

+V

6

V

5

–V

OUT

S

05720-001

05720-002

GENERAL DESCRIPTION

The ADA4899-1 is an ultralow noise (1 nV/√Hz) and distortion (<−117 dBc @1 MHz) unity-gain stable voltage feedback op amp, the combination of which makes it ideal for 16-bit and 18-bit systems. The ADA4899-1 features a linear, low noise input stage and internal compensation that achieves high slew rates and low noise even at unity gain. The Analog Devices, Inc. proprietary next-generation XFCB process and innovative circuit design enable such high performance amplifiers.

The ADA4899-1 drives 100 Ω loads at breakthrough performance l

evels with only 15 mA of supply current. With the wide supply voltage range (4.5 V to 12 V), low offset voltage (230 μV maximum), wide bandwidth (600 MHz), and slew rate (310 V/μs), the ADA4899-1 is designed to work in the most demanding applications. The ADA4899-1 also features an input bias current cancellation mode that reduces input bias current by a factor of 60.

The ADA4899-1 is available in a 3 mm × 3 mm LFCSP and an

-lead SOIC package. Both packages feature an exposed metal

8 paddle that improves heat transfer to the ground plane, which is a significant improvement over traditional plastic packages. The ADA4899-1 is rated to work over the extended industrial temperature range, −40°C to +125°C.

40

G = +1

= ±5V

V

S

–50

= 1kΩ

R

L

= 2V p-p

V

OUT

–60

–70

–80

HD3

05720-071

1001010.1

HARMONIC DISTORTION (dBc)

–90

–100

–110

–120

–130

HD2

FREQUENCY (MHz )

Figure 3. Harmonic Distortion vs. Frequency

Rev. B

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.

ADA4899-1

www.BDTIC.com/ADI

REVISION HISTORY

6/07—Rev. A to Rev. B

Changes to Table 1............................................................................ 3

Changes to Table 2............................................................................ 4

Changes to Figure 21 and Figure 22............................................... 8

Changes to Packaging Innovation Section.................................. 13

Changes to Figure 49 and Figure 50............................................. 15

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

4/06—Rev. 0 to Rev. A

hanges to Figure 2.......................................................................... 1

C

10/05—Revision 0: Initial Version

Packaging Innovation ................................................................ 13

DISABLE

Applications..................................................................................... 14

Unity Gain Operation................................................................ 14

Recommended Values for Various Gains................................ 14

Noise ............................................................................................ 15

ADC Driver................................................................................. 15

DISABLE

ADA4899-1 Mux........................................................................ 16

Circuit Considerations .............................................................. 16

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

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

Pin ..............................................................................13

Pin Operation ........................................................... 16

Rev. B | Page 2 of 20

ADA4899-1

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SPECIFICATIONS WITH ±5 V SUPPLY

TA = 25°C, G = +1, RL = 1 kΩ to ground, unless otherwise noted.

Table 1.

Parameter Conditions Min Typ Max Unit

DYNAMIC PERFORMANCE

–3 dB Bandwidth V

V

Bandwidth for 0.1 dB Flatness G = +2, V Slew Rate V Settling Time to 0.1% V

NOISE/DISTORTION PERFORMANCE

Harmonic Distortion, HD2/HD3 (dBc) fC = 500 kHz, V

f

Input Voltage Noise f = 100 kHz 1.0 nV/√Hz Input Current Noise

DC PERFORMANCE

Input Offset Voltage 35 230 μV Input Offset Voltage Drift 5 μV/°C Input Bias Current

Input Bias Current Drift 3 nA/°C Input Bias Offset Current 0.05 0.7 μA Open-Loop Gain 82 85 dB

INPUT CHARACTERISTICS

Input Resistance Differential mode 4 kΩ Common mode 7.3 MΩ Input Capacitance 4.4 pF Input Common-Mode Voltage Range −3.7 to +3.7 V Common-Mode Rejection Ratio 98 130 dB

DISABLE PIN

DISABLE Input Threshold Voltage Turn-Off Time

Turn-On Time

Input Bias Current

OUTPUT CHARACTERISTICS

Output Overdrive Recovery Time (Rise/Fall) VIN = −2.5 V to +2.5 V, G = +2 30/50 ns Output Voltage Swing RL = 1 kΩ −3.65 to +3.65 −3.7 to +3.7 V R Short-Circuit Current Sinking/sourcing 160/200 mA Off Isolation

POWER SUPPLY

Operating Range 4.5 12 V Quiescent Current 14.7 16.2 mA Quiescent Current (Disabled)

Positive Power Supply Rejection Ratio +VS = 4 V to 6 V (input referred) 84 90 dB Negative Power Supply Rejection Ratio −VS = −6 V to −4 V (input referred) 87 93 dB

= 25 mV p-p 600 MHz

OUT

= 2 V p-p 80 MHz

OUT

= 2 V p-p 35 MHz

OUT

= 5 V step 310 V/μs

OUT

= 2 V step 50 ns

OUT

= 2 V p-p −123/−123 dBc

OUT

= 10 MHz, V

C

f = 100 kHz, DISABLE f = 100 kHz, DISABLE

DISABLE pin floating DISABLE

pin = +V

= 2 V p-p −80/−86 dBc

OUT

pin floating pin = +V

S

2.6 pA/√Hz

5.2 pA/√Hz

−6 −12 μA

S

−0.1 −1 μA

Output disabled <2.4 V 50% of DISABLE

VIN = 0.5 V

50% of DISABLE

voltage to 10% of V

voltage to 90% of V

100 ns

,

OUT

40 ns

,

OUT

VIN = 0.5 V DISABLE DISABLE

f = 1 MHz, DISABLE

DISABLE

= +VS (enabled) = −VS (disabled)

= 100 Ω −3.13 to +3.15 −3.25 to +3.25 V

L

= −V

S

= −V

S

17 21 μA

−35 −44 μA

−48 dB

1.8 2.1 mA

Rev. B | Page 3 of 20

ADA4899-1

www.BDTIC.com/ADI

SPECIFICATIONS WITH +5 V SUPPLY

VS = 5 V @ TA = 25°C, G = +1, RL = 1 kΩ to midsupply, unless otherwise noted.

Table 2.

Parameter Conditions Min Typ Max Unit

DYNAMIC PERFORMANCE

–3 dB Bandwidth V

V

Bandwidth for 0.1 dB Flatness G = +2, V Slew Rate V Settling Time to 0.1% V

NOISE/DISTORTION PERFORMANCE

Harmonic Distortion, HD2/HD3 (dBc) fC = 500 kHz, V

f

Input Voltage Noise f = 100 kHz 1.0 nV/√Hz Input Current Noise

DC PERFORMANCE

Input Offset Voltage 5 210 μV Input Offset Voltage Drift 5 μV/°C Input Bias Current

Input Bias Offset Current 0.05 μA Input Bias Offset Current Drift 2.5 nA/°C Open-Loop Gain 76 80 dB

INPUT CHARACTERISTICS

Input Resistance Differential mode 4 kΩ Common mode 7.7 MΩ Input Capacitance 4.4 pF Input Common-Mode Voltage Range 1.3 to 3.7 V Common-Mode Rejection Ratio 90 114 dB

DISABLE PIN

DISABLE Input Threshold Voltage Turn-Off Time

Turn-On Time

Input Bias Current

OUTPUT CHARACTERISTICS

Overdrive Recovery Time (Rise/Fall) VIN = 0 V to 2.5 V, G = +2 50/70 ns Output Voltage Swing RL = 1 kΩ 1.25 to 3.75 1.2 to 3.8 V R Short-Circuit Current Sinking/sourcing 60/80 mA Off Isolation

POWER SUPPLY

Operating Range 4.5 12 V Quiescent Current 14.3 16 mA Quiescent Current (Disabled)

Positive Power Supply Rejection Ratio +VS = 4.5 V to 5.5 V, −VS = 0 V (input referred) 84 90 dB Negative Power Supply Rejection Ratio +VS = 5 V, −VS = −0.5 V to +0.5 V (input referred) 86 90 dB

= 25 mV p-p 535 MHz

OUT

= 2 V p-p 60 MHz

OUT

= 2 V p-p 25 MHz

OUT

= 2 V step 185 V/μs

OUT

= 2 V step 50 ns

OUT

= 1 V p-p −100/−113 dBc

OUT

= 10 MHz, V

C

f = 100 kHz, DISABLE f = 100 kHz, DISABLE

DISABLE DISABLE

pin floating pin = +V

= 1 V p-p −89/−100 dBc

OUT

pin floating pin = +V

S

2.6 pA/√Hz

5.2 pA/√Hz

−6 −12 μA

S

−0.2 −1.5 μA

Output disabled <2.4 V 50% of DISABLE

voltage to 10% of V

OUT

,

100 ns

VIN = 0.5 V

50% of DISABLE

voltage to 90% of V

OUT

,

60 ns

VIN = 0.5 V DISABLE DISABLE

f = 1 MHz, DISABLE

DISABLE

= +VS (enabled) = −VS (disabled)

= 100 Ω 1.4 to 3.6 1.35 to 3.65 V

L

= −V

S

= −V

S

16 18 μA

−33 −42 μA

−48 dB

1.5 1.7 mA

Rev. B | Page 4 of 20

ADA4899-1

(

www.BDTIC.com/ADI

ABSOLUTE MAXIMUM RATINGS

Table 3.

Parameter Rating

Supply Voltage 12.6 V Power Dissipation See Figure 4 Differential Input Voltage ±1.2 V Differential Input Current ±10 mA Storage Temperature Range –65°C to +150°C Operating Temperature Range –40°C to +125°C Lead Temperature (Soldering 10 sec) 300°C 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.

MAXIMUM POWER DISSIPATION

The maximum safe power dissipation in the ADA4899-1 package is limited by the associated rise in junction temperature (T

) on the die. The plastic encapsulating the die locally reaches

J

the junction temperature. At approximately 150°C, which is the glass transition temperature, the plastic changes its properties. Even temporarily exceeding this temperature limit may change the stresses that the package exerts on the die, permanently shifting the parametric performance of the ADA4899-1. Exceeding a junction temperature of 150°C for an extended period can result in changes in silicon devices, potentially causing failure.

The still-air thermal properties of the package and PCB (θ the ambient temperature (T the package (P

) determine the junction temperature of the die.

D

), and the total power dissipated in

A

The junction temperature is calculated as

T

= TA + (PD × θJA)

J

The power dissipated in the package (P

) is the sum of the

D

quiescent power dissipation and the power dissipated in the package due to the load drive for all outputs. The quiescent power is the voltage between the supply pins (V quiescent current (I midsupply, the total drive power is V

). Assuming the load (RL) is referenced to

S

/2 × I

S

dissipated in the package and some in the load (V

) times the

S

, some of which is

OUT

× I

OUT

),

JA

).

The difference between the total drive power and the load

ower is the drive power dissipated in the package.

p

P

= Quiescent Power + (Total Drive Power – Load Power)

D

⎛

()

D

⎜

IVP

SS

⎜ ⎝

V

2

⎞

V

OUTS

⎟

×+×=

⎟

R

L

⎠

RMS output voltages should be considered. If R V

–, as in single-supply operation, the total drive power is VS ×

S

. If the rms signal levels are indeterminate, consider the

I

OUT

worst case, when V

()

D

= VS/4 for RL to midsupply

OUT

2

)

4

/V

S

+×=

IVP

SS

R

L

In single-supply operation with R is V

= VS/2.

OUT

Airflow increases heat dissipation, effectively reducing θ

2

V

OUT

–

referenced to VS–, worst case

L

R

L

is referenced to

L

. In

JA

addition, more metal directly in contact with the package leads from metal traces, through holes, ground, and power planes reduces the θ

. Soldering the exposed paddle to the ground

JA

plane significantly reduces the overall thermal resistance of the package.

Figure 4 shows the maximum safe power dissipation in the

ackage vs. the ambient temperature for the exposed paddle

p (EPAD) 8-lead SOIC (70°C/W) and 8-lead LFCSP (70°C/W) packages on a JEDEC standard 4-layer board. θ

values are

JA

approximations.

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

MAXIMUM POWER DISSIPATION (W)

0.0

Figure 4. Maximum Power Dissipation vs. Ambient Temperature

LFCSP AND SOIC

120–40–200 20406080100

AMBIENT TEMPERATURE (°C)

ESD CAUTION

05720-003

Rev. B | Page 5 of 20

ADA4899-1

www.BDTIC.com/ADI

TYPICAL PERFORMANCE CHARACTERISTICS

3

0

VS = ±5V R

= 1kΩ

L

V

= 25mV p-p

OUT

G = +1

G = –1

3

0

G = +1 R

= 100Ω

L

V

OUT

= 25mV p-p

–3

–6

–9

NORMALIZ ED CLOSED-L OOP GAI N (dB)

–12

G = +10

FREQUENCY (MHz)

Figure 5. Small Signal Frequency Response for Various Gains, R

G = +2

G = +5

= 1 kΩ

L

3

VS = ±5V R

= 100Ω

L

V

= 25mV p-p

OUT

0

–3

–6

–9

NORMALIZ ED CLOSED- LOOP G AIN (dB)

–12

G = +10

FREQUENCY (MHz)

Figure 6. Small Signal Frequency Response for Various Gains, R

G = +2

G = +5

G = +1

G = –1

= 100 Ω

L

3

0

G = +1 V

= ±5V

S

R

= 1kΩ

–3

L

V

= 25mV p-p

OUT

–6

CLOSED-LOOP GAIN (dB)

–9

–12

FREQUENCY (MHz)

T = +125°C

T = –40°C

Figure 7. Small Signal Frequency Response for Various Temperatures

–3

–6

CLOSED-LOOP GAIN (dB)

–9

05720-004

10001 10010

–12

FREQUENCY (MHz)

V

= +5V

S

VS = ±5V

05720-007

100010 100

Figure 8. Small Signal Frequency Response for Various Supply Voltages

6

G = +1 R

= 1kΩ

L

V

= 25mV p-p

OUT

3

0

–3

–6

CLOSED-LOOP GAIN (dB)

–9

05720-005

10001 10010

–12

CL = 15pF R

= 10Ω

SNUB

C

= 2pF

L

FREQUENCY (MHz)

C

= 0pF

L

C

L

C

= 15pF

= 5pF

L

05720-032

100010010

Figure 9. Small Signal Frequency Response for Capacitive Loads

5.0 VS = ±5V

V

= 25mV p-p

OUT

4.5

G = +1

4.0

R

= 1kΩ

L

3.5

3.0

2.5

2.0

PEAKING (d B)

1.5

1.0

0.5

05720-006

100010 100

0

G = +1 R

= 100Ω

L

G = +2 R

= 1kΩ

L

CAPACITIVE L OAD (pF)

G = +1 R

= 1kΩ

L

R

SNUB

= 10Ω

05720-031

454035302520151050

Figure 10. Small Signal Frequency Response Peaking vs.

citive Load for Various Gains

Capa

Rev. B | Page 6 of 20

ANALOG DEVICES ADA4899-1 Service Manual

FEATURES

APPLICATIONS

CONNECTION DIAGRAMS

GENERAL DESCRIPTION

TABLE OF CONTENTS

REVISION HISTORY

SPECIFICATIONS WITH ±5 V SUPPLY

SPECIFICATIONS WITH +5 V SUPPLY

ABSOLUTE MAXIMUM RATINGS

MAXIMUM POWER DISSIPATION

ESD CAUTION

TYPICAL PERFORMANCE CHARACTERISTICS