ANALOG DEVICES ADA4851-1, ADA4851-2, ADA4851-4 Service Manual

V

查询ADA4850-1供应商

Low Cost, High Speed,

FEATURES

High speed

130 MHz, −3 dB bandwidth
375 V/μs slew rate
55 ns settling time to 0.1%

Excellent video specifications

0.1 dB flatness: 11 MHz
Differential gain: 0.08%

Differential phase: 0.09°
Fully specified at +3 V, +5 V, and ±5 V supplies
Rail-to-rail output

Output swings to within 60 mV of either rail
Low voltage offset: 0.6 mV
Wide supply range: 3 V to 10 V
Low power: 2.5 mA/amplifier
Power-down mode
Available in space-saving packages

SOT-23-6, TSSOP-14, and MSOP-8

APPLICATIONS

Consumer video
Professional video
Video switchers
Active filters

Rail-to-Rail Output Op Amps

ADA4851-1/ADA4851-2/ADA4851-4

PIN CONFIGURATIONS

ADA4851-1

1

V

OUT

2

–V

S

3

+IN

TOP VIEW (Not to Scale)

Figure 1. ADA4851-1, 6-Lead SOT-23 (RJ-6)

ADA4851-2

1

OUT1

–IN1

2
3

+IN1

–V

4

S

TOP VIEW

(Not to Scale)

Figure 2. ADA4851-2, 8-Lead MSOP (RM-8)

1

V

1

OUT

2

–IN 1

3

+IN 1

+V
+IN 2
–IN 2

OUT

S

2

ADA4851-4

4

(Not to Scale)

5

6

7

TOP VIEW

Figure 3. ADA4851-4, 14-Lead TSSOP (RU-14)

+V

6

S

5

POWER DOWN

4

–IN

8

+V
OUT

7
6

–IN2
+IN2

5

14

V

13

–IN 4

12

+IN 4

11

–V
+IN 3

10

9

–IN 3

8

V

S

OUT

OUT

S

05143-058

4

3

05143-001

05143-054

GENERAL DESCRIPTION

The ADA4851-1 (single)/ADA4851-2 (dual)/ADA4851-4
(quad) are low cost, high speed, voltage feedback rail-to-rail
output op amps. Despite their low price, these parts provide
excellent overall performance and versatility. The 130 MHz,

−3 dB bandwidth and high slew rate make these amplifiers well­suited for many general-purpose, high speed applications.

The ADA4851 family is designed to operate at supply voltages
as low as +3 V and up to ±5 V. These parts provide true single­supply capability, allowing input signals to extend 200 mV
below the negative rail and to within 2.2 V of the positive rail.
On the output, the amplifiers can swing within 60 mV of either
supply rail.

With their combination of low price, excellent differential gain
(0.08%), differential phase (0.09º), and 0.1 dB flatness out to
11 MHz, these amplifiers are ideal for consumer video
applications.

Rev. C

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 Anal og Devices. Trademarks and
registered trademarks are the property of their respective owners.

The ADA4851 family is designed to work over the extended
temperature range (−40°C to +125°C).

4

G = +1
V

= 5V

3

S

R

= 1kΩ

L

C

= 5pF

2

L

1

0

–1

–2

–3

CLOSED-LOOP GAIN (dB)

–4

–5

–6

1 10010 1k

FREQUENCY (MHz)

Figure 4. Small S ignal Freq uency Respons e

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] ©2005 Analog Devices, Inc. All rights reserved.

05143-004

ADA4851-1/ADA4851-2/ADA4851-4

TABLE OF CONTENTS

Specifications..................................................................................... 3

Typical Perform anc e C ha r a cte ristics ..............................................7

Specifications with +3 V Supply................................................. 3

Specifications with +5 V Supply................................................. 4

Specifications with ±5 V Supply................................................. 5

Absolute Maximum Ratings............................................................ 6

Thermal Resistance ...................................................................... 6

ESD Caution.................................................................................. 6

REVISION HISTORY

5/05—Rev. B to Rev. C

Changes to General Description .................................................... 1

Changes to Input Section............................................................... 14

4/05—Rev. A to Rev. B

Added ADA4851-2.............................................................Universal

Added 8-Lead MSOP ......................................................... Universal

Changes to Features.......................................................................... 1

Changes to General Description .................................................... 1

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

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

Changes to Table 3............................................................................ 5

Changes to Table 4 and Figure 5..................................................... 6

Changes to Figure 12, Figure 15, and Figure 17 ........................... 8

Changes to Figure 18........................................................................ 9

Changes to Figure 28 Caption....................................................... 10

Changes to Figure 33...................................................................... 11

Changes to Figure 36 and Figure 38............................................. 12

Added Figure 39.............................................................................. 12

Changes to Circuit Description Section...................................... 13

Changes to Headroom Considerations Section ......................... 13

Changes to Overload Behavior and Recovery Section ..............14

Added Single-Supply Video Amplifier Section .......................... 15

Updated Outline Dimensions....................................................... 16

Changes to Ordering Guide.......................................................... 17

Circuit Description......................................................................... 13

Headroom Considerations........................................................ 13

Overload Behavior and Recovery ............................................ 14

Single-Supply Video Amplifier................................................. 15

Outline Dimensions ....................................................................... 16

Ordering Guide .......................................................................... 17

1/05—Rev. 0 to Rev. A

Added ADA4851-4.............................................................Universal

Added 14-Lead TSSOP...................................................... Universal

Changes to Features ..........................................................................1

Changes to General Description .....................................................1

Changes to Figure 3...........................................................................1

Changes to Specifications.................................................................3

Changes to Figure 4...........................................................................6

Changes to Figure 8...........................................................................7

Changes to Figure 11.........................................................................8

Changes to Figure 22.........................................................................9

Changes to Figure 23, Figure 24, and Figure 25......................... 10

Changes to Figure 27 and Figure 28............................................. 10

Changes to Figure 29, Figure 30, and Figure 31......................... 11

Changes to Figure 34...................................................................... 11

Added Figure 37 ............................................................................. 12

Changes to Ordering Guide.......................................................... 15

Updated Outline Dimensions....................................................... 15

10/04—Revision 0: Initial Version

Rev. C | Page 2 of 20

ADA4851-1/ADA4851-2/ADA4851-4

SPECIFICATIONS

SPECIFICATIONS WITH +3 V SUPPLY

TA = 25°C, RF = 0 Ω for G = +1, RF = 1 kΩ for G > +1, RL = 1 kΩ, unless otherwise noted.

Table 1.

Parameter Conditions Min Typ Max Unit

DYNAMIC PERFORMANCE

−3 dB Bandwidth G = +1, VO = 0.1 V p-p 104 130 MHz

G = +1, VO = 0.5 V p-p 80 105 MHz

G = +2, VO = 1.0 V p-p, RL = 150 Ω 40 MHz
Bandwidth for 0.1 dB Flatness G = +2, VO = 1 V p-p, RL = 150 Ω 15 MHz
Slew Rate G = +2, VO = 1 V step 100 V/μs
Settling Time to 0.1% G = +2, VO = 1 V step, RL = 150 Ω 50 ns

NOISE/DISTORTION PERFORMANCE

Harmonic Distortion (dBc) HD2/HD3 fC = 1 MHz, VO = 1 V p-p, G = −1 −73/−79 dBc
Input Voltage Noise f = 100 kHz 10 nV/√Hz
Input Current Noise f = 100 kHz 2.5 pA/√Hz
Differential Gain G = +3, NTSC, RL = 150 Ω, VO = 2 V p-p 0.44 %
Differential Phase G = +3, NTSC, RL = 150 Ω, VO = 2 V p-p 0.41 Degrees
Crosstalk (RTI)—ADA4851-2/ADA4851-4 f = 5 MHz, G = +2, VO = 1.0 V p-p −70/−60 dB

DC PERFORMANCE

Input Offset Voltage 0.6 3.3 mV
Input Offset Voltage Drift 4 μV/°C
Input Bias Current
Input Bias Current Drift 6 nA/°C
Input Bias Offset Current 20 nA
Open-Loop Gain VO = 0.25 V to 0.75 V 80 105 dB

INPUT CHARACTERISTICS

Input Resistance Differential/common-mode 0.5/5.0 MΩ
Input Capacitance 1.2 pF
Input Common-Mode Voltage Range −0.2 to +0.8 V
Input Overdrive Recovery Time (Rise/Fall) VIN = +3.5 V, −0.5 V, G = +1 60/60 ns
Common-Mode Rejection Ratio VCM = 0 V to 0.5 V −81 −103 dB

POWER-DOWN

Power-Down Input Voltage Power-down <1.1 V

Enabled >1.6 V

Turn-Off Time 0.7 μs
Turn-On Time 60 ns
Power-Down Bias Current

Enabled Power-down = 3 V 4 6 μA
Power-Down Power-down = 0 V −14 −20 μA

OUTPUT CHARACTERISTICS

Output Overdrive Recovery Time (Rise/Fall) VIN = +0.7 V, −0.1 V, G = +5 70/100 ns
Output Voltage Swing 0.05 to 2.91 0.03 to 2.94 V
Short-Circuit Current Sinking/sourcing 90/70 mA

POWER SUPPLY

Operating Range 2.7 12 V
Quiescent Current per Amplifier 2.4 2.7 mA
Quiescent Current (Power-Down) Power-down = low 0.2 0.3 mA
Positive Power Supply Rejection +VS = +2.5 V to +3.5 V, −VS = −0.5 V −81 −100 dB
Negative Power Supply Rejection +VS = +2.5 V, −VS = −0.5 V to –1.5 V −80 −100 dB

2.3 4.0 μA

Rev. C | Page 3 of 20

ADA4851-1/ADA4851-2/ADA4851-4

SPECIFICATIONS WITH +5 V SUPPLY

TA = 25°C, RF = 0 Ω for G = +1, RF = 1 kΩ for G > +1, RL = 1 kΩ, unless otherwise noted.

Table 2.

Parameter Conditions Min Typ Max Unit

DYNAMIC PERFORMANCE

−3 dB Bandwidth G = +1, VO = 0.1 V p-p 96 125 MHz

G = +1, VO = 0.5 V p-p 72 96 MHz

G = +2, VO = 1.4 V p-p, RL = 150 Ω 35 MHz
Bandwidth for 0.1 dB Flatness G = +2, VO = 1.4 V p-p, RL = 150 Ω 11 MHz
Slew Rate G = +2, VO = 2 V step 200 V/μs
Settling Time to 0.1% G = +2, VO = 2 V step, RL = 150 Ω 55 ns

NOISE/DISTORTION PERFORMANCE

Harmonic Distortion (dBc) HD2/HD3 fC = 1 MHz, VO = 2 V p-p, G = +1 −80/−100 dBc
Input Voltage Noise f = 100 kHz 10 nV/√Hz
Input Current Noise f = 100 kHz 2.5 pA/√Hz
Differential Gain G = +2, NTSC, RL = 150 Ω, VO = 2 V p-p 0.08 %
Differential Phase G = +2, NTSC, RL = 150 Ω, VO = 2 V p-p 0.11 Degrees
Crosstalk (RTI)—ADA4851-2/ADA4851-4 f = 5 MHz, G = +2, VO = 2.0 V p-p −70/−60 dB

DC PERFORMANCE

Input Offset Voltage 0.6 3.4 mV
Input Offset Voltage Drift 4 μV/°C
Input Bias Current
Input Bias Current Drift 6 nA/°C
Input Bias Offset Current 20 nA
Open-Loop Gain VO = 1 V to 4 V 97 107 dB

INPUT CHARACTERISTICS

Input Resistance Differential/common-mode 0.5/5.0 MΩ
Input Capacitance 1.2 pF
Input Common-Mode Voltage Range −0.2 to +2.8 V
Input Overdrive Recovery Time (Rise/Fall) VIN = +5.5 V, −0.5 V, G = +1 50/45 ns
Common-Mode Rejection Ratio VCM = 0 V to 2 V −86 −105 dB

POWER-DOWN

Power-Down Input Voltage Power-down <1.1 V

Enabled >1.6 V

Turn-Off Time 0.7 μs
Turn-On Time 50 ns
Power-Down Bias Current

Enabled Power-down = 5 V 33 40 μA
Power-Down Power-down = 0 V −22 −30 μA

OUTPUT CHARACTERISTICS

Output Overdrive Recovery Time (Rise/Fall) VIN = +1.1 V, −0.1 V, G = +5 60/70 ns
Output Voltage Swing 0.09 to 4.91 0.06 to 4.94 V
Short-Circuit Current Sinking/sourcing 110/90 mA

POWER SUPPLY

Operating Range 2.7 12 V
Quiescent Current per Amplifier 2.5 2.8 mA
Quiescent Current (Power-Down) Power-down = low 0.2 0.3 mA
Positive Power Supply Rejection +VS = +5 V to +6 V, −VS = 0 V −82 −101 dB
Negative Power Supply Rejection +VS = +5 V, −VS = −0 V to −1 V −81 −101 dB

2.2 3.9 μA

Rev. C | Page 4 of 20

ADA4851-1/ADA4851-2/ADA4851-4

SPECIFICATIONS WITH ±5 V SUPPLY

TA = 25°C, RF = 0 Ω for G = +1, RF = 1 kΩ for G > +1, RL = 1 kΩ, unless otherwise noted.

Table 3.

Parameter Conditions Min Typ Max Unit

DYNAMIC PERFORMANCE

−3 dB Bandwidth G = +1, VO = 0.1 V p-p 83 105 MHz

G = +1, VO = 1 V p-p 52 74 MHz

G = +2, VO = 2 V p-p, RL = 150 Ω 40 MHz
Bandwidth for 0.1 dB Flatness G = +2, VO = 2 V p-p, RL = 150 Ω 11 MHz
Slew Rate G = +2, VO = 7 V step 375 V/μs
G = +2, VO = 2 V step 190 V/μs
Settling Time to 0.1% G = +2, VO = 2 V step, RL = 150 Ω 55 ns

NOISE/DISTORTION PERFORMANCE

Harmonic Distortion (dBc) HD2/HD3 fC = 1 MHz, VO = 2 V p-p, G = +1 −83/−107 dBc
Input Voltage Noise f = 100 kHz 10 nV/√Hz
Input Current Noise f = 100 kHz 2.5 pA/√Hz
Differential Gain G = +2, NTSC, RL = 150 Ω, VO = 2 V p-p 0.08 %
Differential Phase G = +2, NTSC, RL = 150 Ω, VO = 2 V p-p 0.09 Degrees
Crosstalk(RTI)—ADA4851-2/ADA4851-4 f = 5 MHz, G = +2, VO = 2.0 V p-p −70/−60 dB

DC PERFORMANCE

Input Offset Voltage 0.6 3.5 mV
Input Offset Voltage Drift 4 μV/°C
Input Bias Current
Input Bias Current Drift 6 nA/°C
Input Bias Offset Current 20 nA
Open-Loop Gain

INPUT CHARACTERISTICS

Input Resistance Differential/common-mode 0.5/5.0 MΩ
Input Capacitance 1.2 pF
Input Common-Mode Voltage Range −5.2 to +2.8 V
Input Overdrive Recovery Time (Rise/Fall) VIN = ±6 V, G = +1 50/25 ns
Common-Mode Rejection Ratio VCM = 0 V to 4 V −90 −105 dB

POWER-DOWN

Power-Down Input Voltage Power-down < −3.9 V
Enabled > −3.4 V
Turn-Off Time 0.7 μs
Turn-On Time 30 ns
Power-Down Bias Current

Enabled Power-down = +5 V 100 130 μA
Power-Down Power-down = −5 V −50 −60 μA

OUTPUT CHARACTERISTICS

Output Overdrive Recovery Time (Rise/Fall) VIN = ±1.2 V, G = +5 80/50 ns
Output Voltage Swing −4.87 to +4.88 −4.92 to +4.92 V
Short-Circuit Current Sinking/sourcing 125/110 mA

POWER SUPPLY

Operating Range 2.7 12 V
Quiescent Current per Amplifier 2.9 3.2 mA
Quiescent Current (Power-Down) Power-down = low 0.2 0.3 mA
Positive Power Supply Rejection +VS = +5 V to +6 V, −VS = −5 V −82 −101 dB
Negative Power Supply Rejection +VS = +5 V, −VS = −5 V to −6 V −81 −102 dB

2.2 4.0 μA

= ±2.5 V

V

O

99 106 dB

Rev. C | Page 5 of 20

ADA4851-1/ADA4851-2/ADA4851-4

(

)

ABSOLUTE MAXIMUM RATINGS

Table 4.

Parameter Rating

Supply Voltage 12.6 V
Power Dissipation See Figure 5
Common-Mode Input Voltage −VS − 0.5 V to +VS + 0.5 V
Differential Input Voltage +VS to −V

S

Storage Temperature −65°C to +125°C
Operating Temperature Range −40°C to +125°C
Lead Temperature Range 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 5. Thermal Resistance

Package Type θ

JA

Unit

6-lead SOT-23 170 °C/W
14-lead TSSOP 120 °C/W
8-lead MSOP 150 °C/W

Maximum Power Dissipation

The maximum safe power dissipation for the ADA4851-1/
ADA4851-2/ADA4851-4 is limited by the associated rise in
junction temperature (T

) on the die. At approximately 150°C,

J

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
amplifiers. Exceeding a junction temperature of 150°C for an
extended period of time can result in changes in silicon devices,
potentially causing degradation or loss of functionality.

The power dissipated in the package (P

) is the sum of the

D

quiescent power dissipation and the power dissipated in the die

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.

due to the amplifiers’ drive at the output. The quiescent power

is the voltage between the supply pins (V

current (I

).

S

= Quiescent Power + (Tot a l Dr i v e Pow e r − Load Power)

P

D

()

D

IVP

SS

VV

⎛

S

×+×=

⎜

2

⎝

OUT

R

V

⎞

–

⎟

L

⎠

RMS output voltages should be considered. If RL is referenced

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

to −V

S

× I

V

worst case, when V

In single-supply operation with R

is V

. If the rms signal levels are indeterminate, consider the

S

OUT

= VS/4 for RL to midsupply.

OUT

2

V

4/

()

D

= VS/2.

OUT

S

IVP

+×=

SS

R

L

referenced to −VS, worst case

L

Airflow increases heat dissipation, effectively reducing θ

Also, more metal directly in contact with the package leads and

through holes under the device reduces θ

Figure 5 shows the maximum safe power dissipation in the

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

(170°C/W), the 8-lead MSOP (150°C/W), and the 14-lead

TSSOP (120°C/W) on a JEDEC standard 4-layer board. θ

values are approximations.

2.0

TSSOP

1.5

MSOP

1.0

0.5

MAXIMUM POWER DISSIPATION (W)

0

–55 125

Figure 5. Maximum Power Dissipation vs. Temperature for a 4-Layer Board

SOT-23-6

–45 –35 –25 –15 –5 5 15 25 35 45 55 65 75 85 95 105 115

AMBIENT TEMPERATURE (°C)

) times the quiescent

S

2

OUT

R

L

.

JA

.

JA

JA

05143-057

Rev. C | Page 6 of 20

ADA4851-1/ADA4851-2/ADA4851-4

TYPICAL PERFORMANCE CHARACTERISTICS

TA = 25°C, RF = 0 Ω for G = +1, RF = 1 kΩ for G > +1, RL = 1 kΩ, unless otherwise noted.

1

0

–1

–2

–3

–4

CLOSED-LOOP GAIN (dB)

–5

–6

–7

1 10010

G = +10

FREQUENCY (MHz)

G = +2

VS = ±5V
R

= 150Ω

L

V

OUT

G = –1

Figure 6. Small Signal Frequency Response for Various Gains

= 0.1V p-p

05143-006

4

G = +1
V

= 5V

3

S

R

= 1kΩ

L

V

= 0.1V p-p

2

OUT

1

0

–1

–2

–3

CLOSED-LOOP GAIN (dB)

–4

–5

–6

1 10010 300

FREQUENCY (MHz)

5pF

0pF

10pF

Figure 9. Small Signal Frequency Response for Various Capacitor Loads

05143-010

1

0

VS = ±5V

–1

G = +1
V

= 0.1V p-p

OUT

–2

–3

–4

CLOSED-LOOP GAIN (dB)

–5

–6

1 10010 300

FREQUENCY (MHz)

R

L

RL = 150Ω

= 1kΩ

Figure 7. Small Signal Frequency Response for Various Loads

2

G = +1
R

= 150Ω

L

1

V

= 0.1V p-p

OUT

0

–1

–2

–3

CLOSED-LOOP GAIN (dB)

–4

–5

–6

1 10010 300

FREQUENCY (MHz)

V

= ±5V

S

V

= +5V

S

Figure 8. Small Signal Frequency Response for Various Supplies

05143-009

05143-007

1

0

VS = ±5V

–1

G = +1
V

= 0.1V p-p

OUT

–2

–3

–4

CLOSED-LOOP GAIN (dB)

–5

–6

1 10010

–40°C

+25°C

FREQUENCY (MHz)

+125°C

+85°C

300

Figure 10. Small Signal Frequency Response for Various Temperatures

1

0

–1

–2

–3

–4

CLOSED-LOOP GAIN (dB)

–5

–6

–7

1 10010

G = +10

FREQUENCY (MHz)

G = –1

VS = ±5V
R

= 150Ω

L

V

= 1V p-p

OUT

G = +2

Figure 11. Large Signal Frequency Response for Various Gains

05143-008

05143-012

Rev. C | Page 7 of 20