Datasheet ADA4851-1 Datasheet (Analog Devices)

Low Cost, High Speed,

FEATURES

High speed

130 MHz, −3 dB bandwidth 375 V/µs slew rate 85 ns settling time to 0.1%

Excellent video specifications

0.1 dB flatness: 14 MHz Differential gain: 0.04%

Differential phase: 0.06° Fully specified at +3 V, +5 V, and ±5 V supplies Rail-to-rail output

Output swings to within 70 mV of either rail Low voltage offset: 0.6 mV Wide supply range: 3 V to 10 V Low power: 2.5 mA Power-down mode Available in space-saving packages: SOT-23-6 and TSSOP-14

APPLICATIONS

Consumer video Professional video Video switchers Active filters

Rail-to-Rail Output Op Amps

ADA4851-1/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)

V

1

OUT

–IN 1

2

+IN 1

3

ADA4851-4

4

+V

S

5

+IN 2

6

–IN 2

V

2

7

OUT

Figure 2. ADA4851-4, 14-Lead TSSOP (RU-14)

6

5

4

+V

S

POWER DOWN

–IN

14

V

4

OUT

–IN 4

13

+IN 4

12

11

–V

S

10

+IN 3

9

–IN 3

8

3

V

OUT

05143-001

05143-054

GENERAL DESCRIPTION

The ADA4851-1 (single)/ADA4851-4 (quad) are low cost, high speed, voltage feedback rail-to-rail output op amps. Despite their low price, the ADA4851-1/ADA4851-4 provide excellent overall performance and versatility. The 130 MHz, −3 dB bandwidth and 375 V/µs slew rate make these amplifiers wellsuited for many general-purpose, high speed applications.

The ADA4851-1/ADA4851-4 are designed to operate at supply voltages as low as 3 V and up to ±5 V, using only 2.5 mA of supply current. To further reduce power consumption, the amplifier is equipped with a power-down mode, which lowers the supply current to 0.2 mA.

The ADA4851-1/ADA4851-4 provide users with a 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 amplifier can swing within 70 mV of either supply rail.

With their combination of low price, excellent differential gain (0.04%), differential phase (0.06º), and 0.1 dB flatness out to 12 MHz, these amplifiers are ideal for consumer video applications.

Rev. A

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 ADA4851-1 is available in a 6-lead SOT-23 package, and the ADA4851-4 is available in a 14-lead TSSOP package. Both are designed to work in the extended temperature range (−40°C to +125°C).

4

G = +1

= 5V

V

3

S

= 1kΩ

R

L

= 5pF

C

2

L

1

0

–1

–2

–3

CLOSED-LOOP GAIN (dB)

–4

–5

–6

1 10010 1k

FREQUENCY (MHz)

Figure 3. Small Signal Frequency Respon se

www.analog.com

05143-004

ADA4851-1/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 = 0.5 V p-p, RL = 150 Ω 18 MHz Slew Rate G = +2, VO = 1 V step 100 V/µs

NOISE/DISTORTION PERFORMANCE

Harmonic Distortion (dBc) HD2/HD3 fC = 1 MHz, VO = 0.2 V p-p, G = +2 −85/−113 dBc Input Voltage Noise f = 100 kHz 10

Input Current Noise f = 100 kHz 2.5 Crosstalk f = 5 MHz, G = +2, VO = 1.0 V p-p −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 80 102 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 −106 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 −102 dB Negative Power Supply Rejection +VS = +2.5 V, −VS = −0.5 V to –1.5 V −80 −102 dB

2.3 4.0 µA

nV/√Hz pA/√Hz

Rev. A | Page 3 of 16

ADA4851-1/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 12 MHz Slew Rate G = +2, VO = 3 V step 200 V/µs Settling Time to 0.1% G = +2, VO = 1 V step, RL = 150 Ω 85 ns

NOISE/DISTORTION PERFORMANCE

Harmonic Distortion (dBc) HD2/HD3 fC = 1 MHz, VO = 0.2 V p-p, G = +2 −98/−113 dBc Input Voltage Noise f = 100 kHz 10

Input Current Noise f = 100 kHz 2.5 Differential Gain G = +2, NTSC, RL = 150 Ω 0.05 % Differential Phase G = +2, NTSC, RL = 150 Ω 0.09 Degrees Crosstalk f = 5 MHz, G = +2, VO = 2.0 V p-p −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 −88 −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

nV/√Hz pA/√Hz

Rev. A | Page 4 of 16

ADA4851-1/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 10 MHz Slew Rate G = +2, VO = 7 V p-p step 375 V/µs G = +2, VO = 2 V p-p step 190 V/µs Settling Time to 0.1% G = +2, VO = 2 V step, RL = 150 Ω 90 ns

NOISE/DISTORTION PERFORMANCE

Harmonic Distortion (dBc) HD2/HD3 fC = 1 MHz, VO = 1 V p-p, G = +1 −90/−117 dBc Input Voltage Noise f = 100 kHz 10

Input Current Noise f = 100 kHz 2.5 Differential Gain G = +2, NTSC, RL = 150 Ω 0.04 % Differential Phase G = +2, NTSC, RL = 150 Ω 0.06 Degrees Crosstalk f = 5 MHz, G = +2, VO = 2.0 V p-p −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 0.1 0.13 mA Power-Down Power-down = −5 V −0.05 −0.06 mA

OUTPUT CHARACTERISTICS

Output Overdrive Recovery Time (Rise/Fall) VIN = ±1.2 V, G = +5 80/50 ns Output Voltage Swing −4.88 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 −102 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

nV/√Hz pA/√Hz

Rev. A | Page 5 of 16

ADA4851-1/ADA4851-4

(

ABSOLUTE MAXIMUM RATINGS

Table 4.

Parameter Rating

Supply Voltage 12.6 V Power Dissipation See Figure 4 Common-Mode Input Voltage −VS − 0.5 V to +VS + 0.5 V Differential Input Voltage +VS to −V Storage Temperature −65°C to +125°C Operating Temperature Range −40°C to +125°C Lead Temperature Range

300°C

(Soldering 10 sec) 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, i.e., θJA is specified

for device soldered in circuit board for surface-mount packages.

Table 5. Thermal Resistance

Package Type θ

6-Lead SOT-23 170 °C/W 14-Lead TSSOP 120 °C/W

Maximum Power Dissipation

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

) on the die. At approximately 150°C, which is

J

S

JA

Unit

The power dissipated in the package (P

) is the sum of the

D

quiescent power dissipation and the power dissipated in the die

due to the ADA4851-1/ADA4851-4 drive at the output. The

quiescent power is the voltage between the supply pins (V

times the quiescent current (I

= Quiescent Power + (Tot a l D r iv e P o w e r − Load Power)

P

D

()

D

⎛

IVP

⎜

SS

⎝

RMS output voltages should be considered. If R

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

to −V

S

× I

V

worst case, when V

. If the rms signal levels are indeterminate, consider the

S

OUT

= VS/4 for RL to midsupply.

OUT

()

D

V

+×=

IVP

SS

In single-supply operation with R

= VS/2.

is V

OUT

).

S

2

VV

S

×+×=

2

)

4/

S

R

L

V

⎞

OUT

R

OUT

–

⎟

L

⎠

R

L

is referenced

L

referenced to −VS, worst case

L

Airflow increases heat dissipation, effectively reducing θ

)

S

.

JA

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

exposed paddle from metal traces, through holes, ground, and

power planes, reduces θ

.

JA

Figure 4 shows the maximum safe power dissipation in the

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

(170°C/W) package and the 14-lead TSSOP (120°C/W) on a

JEDEC standard 4-layer board. θ

2.0

1.5

1.0

0.5

MAXIMUM POWER DISSIPATION (W)

values are approximations.

JA

TSSOP

SOT-23

0

–30 –20 –10 0 10 20 40 8030 50 60 70 10090 120110

–40

AMBIENT TEMPERATURE (°C)

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

05143-057

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. A | Page 6 of 16

ADA4851-1/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

= 150Ω

R

L

V

OUT

G = –1

Figure 5. 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 8. 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 6. 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 7. 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 9. 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

= 1V p-p

V

OUT

G = +2

Figure 10. Large Signal Frequency Response for Various Gains

05143-008

05143-012

Rev. A | Page 7 of 16

ADA4851-1/ADA4851-4

–

6.2

6.1

6.0

5.9

5.8 = 1V p-p

V

5.7

CLOSED-LOOP GAIN (dB)

5.6

5.5

5.4

0.1 101 100

Figure 11. 0.1 dB Flatness Response

OUT

= 100mV p-p

V

OUT

V

= 2V p-p

OUT

FREQUENCY (MHz)

VS = ±5V G = +2 R

= 150Ω

L

05143-021

–50

G = +2 RL = 1kΩ

–60

V

= 200mV p-p

OUT

–70

–80

–90

–100

HARMONIC DISTORTION (dBc)

–110

–120

VS = ±5V HD2

0.1 101 100

= +3V HD2

V

S

V

= ±5V HD3

V

S

FREQUENCY (MHz)

= +3V HD3

S

Figure 14. Harmonic Distortion vs. Frequency for Various Supplies

05143-014

1

0

–1

–2

–3

–4

CLOSED-LOOP GAIN (dB)

–5

–6

1 10010 300

FREQUENCY (MHz)

R

L

= 150Ω

VS = ±5V G = +1 V

R

Figure 12. Large Frequency Response for Various Loads

140

120

100

80

60

40

OPEN-LOOP GAIN (dB)

20

0

PHASE

GAIN

OUT

= 1kΩ

L

= 1V p-p

VS = ±5V

0

–30

–60

–90

–120

–150

–180

–210

05143-015

OPEN-LOOP PHASE (Degrees)

50

G = +2 V

= ±5V

S

–60

R

= 1kΩ

L

f = 2MHz

–70

–80

–90

–100

HARMONIC DISTORTION (dBc)

–110

–120

012345678910

HD2

HD3

OUTPUT AMPLITUDE (V p-p)

Figure 15. Harmonic Distortion vs. Output Voltage

–50

G = +1 V

= ±5V

S

–60

–70

–80

–90

–100

HARMONIC DISTORTION (dBc)

–110

V

OUT

= 1V p-p

= 1kΩ HD2

R

L

R

= 150Ω HD2

L

= 150Ω

R

L

HD3

= 1kΩ HD3

R

L

05143-017

–20

100k10k100 1k10 1M 10M 100M 1G

FREQUENCY (Hz)

Figure 13. Open-Loop Gain and Phase vs. Frequency

–240

05143-029

–120

0.1 101 FREQUENCY (MHz)

Figure 16. Harmonic Distortion vs. Frequency for Various Loads

05143-016

Rev. A | Page 8 of 16

ADA4851-1/ADA4851-4

–50

G = +1 VS = ±5V

–60

R

= 1kΩ

L

–70

V

–80

–90

–100

HARMONIC DISTORTION (dBc)

–110

–120

= 2V p-p HD3

OUT

0.1 101 100

= 2V p-p HD2

V

OUT

FREQUENCY (MHz)

V

= 200mV p-p HD2

OUT

= 200mV p-p HD3

V

OUT

Figure 17. Harmonic Distortion vs. Frequency for Various V

OUT

05143-013

0.075 G = +1 OR +2

= 1kΩ

R

L

0.050

0.025

0

–0.025

–0.050

OUTPUT VOLTAGE FOR ±5V SUPPLY (V)

–0.075

VS = +5V

500 100 150 200

TIME (ns)

V

Figure 20. Small Signal Transient Response for Various Supplies

= ±5V

S

2.575

2.550

2.525

2.500

2.475

2.450

2.425

OUTPUT VOLTAGE FOR 5V SUPPLY (V)

05143-024

6 5 4 3 2 1

0 –1 –2 –3

INPUT AND OUTPUT VOLTAGE (V)

–4 –5 –6

0 100 200 300 400 500 600 700 800 900 1k

5 × INPUT

OUTPUT

TIME (ns)

Figure 18. Output Overdrive Recovery

6

5

4

3

2

1

0 –1 –2 –3

INPUT AND OUTPUT VOLTAGE (V)

–4 –5 –6

OUTPUT

0 100 200 300 400 500 600 700 800 900 1k

INPUT

TIME (ns)

Figure 19. Input Overdrive Recovery

G = +5 V

= ±5V

S

R

= 150Ω

L

f = 1MHz

G = +1 V

= ±5V

S

= 150Ω

R

L

f = 1MHz

05143-019

05143-022

2.575 G = +1

= 5V

V

S

= 150Ω

R

L

2.550

2.525

2.500

2.475

OUTPUT VOLTAGE (V)

2.450

2.425

0 20 40 60 80 100 120 140 160 180 200

10pF

0pF

TIME (ns)

Figure 21. Small Signal Transient Response for Capacitive Load

1.5 G = +2

= 150Ω

R

L

1.0

= ±5V

V

S

0.5

0

–0.5

–1.0

OUTPUT VOLTAGE FOR ±5V SUPPLY (V)

–1.5

VS = +5V

500 100 150 200

TIME (ns)

Figure 22. Large Signal Transient Response for Various Supplies

3.0

2.5

2.0

1.5

1.0

0.5

0

05143-026

OUTPUT VOLTAGE FOR 5V SUPPLY (V)

05143-028

Rev. A | Page 9 of 16

ADA4851-1/ADA4851-4

1.5 G = +1

= 150Ω

R

L

1.0

= ±5V

0.5

–0.5

V

S

0

VS = +5V

3.0

2.5

2.0

1.5

1.0

6

5

V

4

3

2

VOLTAGE (V)

1

DISABLE

G = +2

= 5V

V

S

= 400kHz

f

IN

–1.0

OUTPUT VOLTAGE FOR ±5V SUPPLY (V)

–1.5

500 100 150 200

TIME (ns)

Figure 23. Large Signal Transient Response for Various Supplies

0.5

(V)

S

0.4

0.3

0.2

0.1

DC VOLTAGE DIFFERENTIAL FROM V

0

0 5 10 15 20 25 30 35

LOAD CURRENT (mA)

+VS– V

VS = +3V

OUT

V

–V

– V

S

Figure 24. Output Saturation Voltage vs. Load Current

600

G = +2

= ±5V

V

S

= 1kΩ

R

L

500

400

300

200

SLEW RATE (V/µs)

100

25% TO 75% OF V

NEGATIVE SLEW RATE

O

POSITIVE SLEW RATE

= ±5V

S

OUT

0.5

0

OUTPUT VOLTAGE FOR 5V SUPPLY (V)

05143-027

05143-049

0

–1

03015 45

V

OUT

TIME (µs)

Figure 26. Enable/Disable Time

3.5

3.0

2.5

2.0

1.5

1.0

SUPPLY CURRENT (mA)

0.5

0

–5 –4 –3 –2 –1 0 1 2 3 4 5

300

200

100

0

–100

–200

INPUT OFFSET VOLTAGE (µV)

–300

VS = ±5V

V

= +5V

S

DISABLE VOLTAGE (V)

Figure 27. Supply Current vs.

VS = ±5V

VS = +5V

POWER DOWN

VS = +3V

V

= +3V

S

Pin Voltage

05143-033

05143-034

0

0123456789

OUTPUT VOLTAGE STEP (V p-p)

Figure 25. Slew Rate vs. Output Voltage

10

05143-032

Rev. A | Page 10 of 16

–400

–40 –25 –10 5 20 35 50 65 80 95 110 125

TEMPERATURE (°C)

Figure 28. Input Offset Voltage vs. Temperature for Various Supplies

05143-035

ADA4851-1/ADA4851-4

2.2

2.0

1k

G = +10

+, VS = ±5V

I

1.8

IB+, VS = +5V

1.6

INPUT BIAS CURRENT (µA)

1.4

1.2

–40 –25 –10 5 20 35 50 65 80 95 110 125

B

–, VS = +5V

I

B

TEMPERATURE (°C)

–, VS = ±5V

I

B

Figure 29. Input Bias Current vs. Temperature for Various Supplies

0.09

(V)

S

0.08

+VS– V

OUT

0.07

–V

0.06

0.05

DC VOLTAGE DIFFERENTIAL FROM V

0.04 –40 –25 –10 5 20 35 50 65 80 95 110 125

– V

S

OUT

VS = ±5V

+VS– V

OUT

–VS– V

TEMPERATURE (°C)

OUT

V

= +5V

S

Figure 30. Output Saturation vs. Temperature for Various Supplies

05143-036

05143-037

100

10

VOLTAGE NOISE (nV/ Hz)

1

100

10

CURRENT NOISE (pA/ Hz)

1

10 100

1k 10k 100k 1M 10M

FREQUENCY (Hz)

Figure 32. Voltage Noise vs. Frequency

G = +2

100 1k 10k 100k 1M 10M 100M

10

FREQUENCY (Hz)

Figure 33. Current Noise vs. Frequency

05143-044

05143-045

3.2 VS = ±5V

3.0

2.8

V

= +5V

2.6

2.4

SUPPLY CURRENT (mA)

2.2

2.0

–40 –25 –10 5 20 35 50 65 80 95 110 125

TEMPERATURE (°C)

S

VS = +3V

Figure 31. Supply Current vs. Temperature for Various Supplies

05143-038

Rev. A | Page 11 of 16

80

VS = ±5V N = 420

70

x = –260µV σ = 780µV

60

50

40

COUNT

30

20

10

0

–4 –3 –2 –1 0 1 2 3 4

V

(mV)

OFFSET

Figure 34. Input Offset Voltage Distribution

05143-047

ADA4851-1/ADA4851-4

–30

VS = ±5V

–40

–50

–60

–70

–80

–90

–100

COMMON-MODE REJECTION (dB)

–110

–120

1k 10k 100k 1M 10M 100M 1G

FREQUENCY (Hz)

Figure 35. Common-Mode Rejection Ratio (CMRR) vs. Frequency

05143-020

0

–10

–20

–30

–40

–50

–60

CROSSTALK (dB)

–70

–80

–90

–100

G = +2 V

= 5V

S

R

= 1kΩ

L

V

= 1V p-p

IN

DRIVE AMPS 1, 2, AND 4 LISTEN AMP 3

DRIVE AMP 1 LISTEN AMP 2

1 10 100 1k

FREQUENCY (MHz)

Figure 37. ADA4851-4 Crosstalk vs. Frequency

05143-055

0

VS = ±5V

–10 –20 –30 –40 –50 –60 –70 –80 –90

POWER SUPPLY REJECTION (dB)

–100 –110

100 1k 10k 100k 1M 10M 100M 1G

+PSR

–PSR

FREQUENCY (Hz)

Figure 36. Power Supply Rejection (PSR) vs. Frequency

05143-023

Rev. A | Page 12 of 16

ADA4851-1/ADA4851-4

CIRCUIT DESCRIPTION

The ADA4851-1/ADA4851-4 feature a high slew rate input stage that is a true single-supply topology, capable of sensing signals at or below the minus supply rail. The rail-to-rail output stage can pull within 70 mV of either supply rail when driving light loads and within 0.17 V when driving 150 Ω. High speed performance is maintained at supply voltages as low as 2.7 V.

HEADROOM CONSIDERATIONS

This amplifier is designed for use in low voltage systems. To obtain optimum performance, it is useful to understand the behavior of the amplifier as input and output signals approach the amplifier’s headroom limits. The ADA4851-1/ADA4851-4’s input common-mode voltage range extends from the negative supply voltage (actually 200 mV below this), or ground for single-supply operation, to within 2 V of the positive supply voltage. Therefore, at a gain of 3, the ADA4851-1/ADA4851-4 can provide full rail-to-rail output swing for supply voltages as low as 3.3 V, assuming the input signal swing is from −V ground) to +V

/2. At a gain of 4, the ADA4851-1/ADA4851-4

S

can provide a rail-to-rail output range down to 3 V total supply voltage.

Exceeding the headroom limit is not a concern for any inverting gain on any supply voltage, as long as the reference voltage at the amplifier’s positive input lies within the amplifier’s input common-mode range.

(or

S

440

460

480

500

(µV)

520

OS

V

540

560

580

600

–6 –5 –4 –3 –2 –1 0 1 2 3 4

VCM (V)

Figure 38. V

2

G = +1

= 1k

R

L

1

VS = 5V

0

–1

–2

GAIN (dB)

–3

–4

vs. Common-Mode Voltage, VS = ±5 V

OS

Ω

VCM = 3.0V

V

= 3.1V

CM

V

= 3.2V

CM

V

= 3.3V

CM

05143-046

The input stage is the headroom limit for signals when the amplifier is used in a gain of 1 for signals approaching the positive rail. Figure 38 shows a typical offset voltage vs. the input common-mode voltage for the ADA4851-1/ADA4851-4 amplifiers on a ±5 V supply. Accurate dc performance is maintained from approximately 200 mV below the minus supply to within 2 V of the positive supply. For high speed signals, however, there are other considerations. Figure 39 shows

−3 dB bandwidth vs. dc input voltage for a unity-gain follower. As the common-mode voltage approaches the positive supply, the amplifier responds well, but the bandwidth begins to drop at 2 V within +V

.

S

–5

–6

0.1 101 100 FREQUENCY (MHz)

1000

Figure 39. Unity-Gain Follower Bandwidth vs. Input Common-Mode

This can manifest itself in increased distortion or settling time. Higher frequency signals require more headroom than the lower frequencies to maintain distortion performance. Figure 40 illustrates how the rising edge settling time for the amplifier configured as a unity-gain follower stretches out as the top of a 1 V step input approaches and exceeds the specified input common-mode voltage limit.

For signals approaching the minus supply and inverting gain and high positive gain configurations, the headroom limit is the output stage. The ADA4851-1/ADA4851-4 amplifiers use a common emitter output stage. This output stage maximizes the available output range, limited by the saturation voltage of the output transistors. The saturation voltage increases with the drive current the output transistor is required to supply, due to the output transistors’ collector resistance.

05143-050

Rev. A | Page 13 of 16

ADA4851-1/ADA4851-4

3.6 G = +1

= 1k

Ω

R

3.4

L

VS = 5V

3.2

3.0

V

V V V

STEP

= 2V TO 3V = 2.1V TO 3.1V

= 2.2V TO 3.2V = 2.3V TO 3.3V = 2.4V TO 3.4V

TIME (ns)

2.8

2.6

2.4

OUTPUT VOLTAGE (V)

2.2

2.0

1.8

0 102030405060708090100

Figure 40. Output Rising Edge for 1 V Step at Input Headroom Limits

As the saturation point of the output stage is approached, the output signal shows increasing amounts of compression and clipping. As in the input headroom case, higher frequency signals require a bit more headroom than the lower frequency signals. Figure 15 illustrates this point by plotting the typical distortion vs. the output amplitude.

OVERLOAD BEHAVIOR AND RECOVERY

Input

The specified input common-mode voltage of the ADA4851-1/ ADA4851-4 is 200 mV below the negative supply to within 2 V of the positive supply. Exceeding the top limit results in lower bandwidth and increased settling time, as seen in Figure 39 and Figure 40. Pushing the input voltage of a unity-gain follower less than 2 V from the positive supply leads to the behavior shown in Figure 41—an increasing amount of output error as well as much increased settling time. The recovery time from input voltages 2 V or closer to the positive supply is approximately 85 ns, which is limited by the settling artifacts caused by transistors in the input stage coming out of saturation.

The ADA4851-1/ADA4851-4 do not exhibit phase reversal, even for input voltages beyond the voltage supply rails. Going more than 0.6 V beyond the power supplies turns on protection diodes at the input stage, which greatly increase the current draw of the devices.

05143-052

3.50 G = +1

= 1k

Ω

R

L

VS = 5V

3.25

V

= 2.25V TO 3.25V

3.00

2.75

2.50

OUTPUT VOLTAGE (V)

2.25

2.00

0 100 200 300 400 500 600 700 800 900 1k

STEP

V

= 2.25V TO

STEP

3.5V, 4V, AND 5V

TIME (ns)

Figure 41. Pulse Response of G = 1 Follower,

Input Step Overloading the Input Stage

Output

Output overload recovery is typically within 35 ns after the amplifier’s input is brought to a nonoverloading value. Figure 42 shows output recovery transients for the amplifier recovering from a saturated output from the top and bottom supplies to a point at midsupply.

7

6

5

4

3

INPUT VOLTAGE EDGES

2

1

0

INPUT AND OUTPUT VOLTAGE (V)

–1

–2

0 102030405060708090100

V

OUT

TIME (ns)

= 5V TO 2.5V

V

OUT

Figure 42. Overload Recovery

G = –1

= 1k

R

L

VS = 5V

= 0V TO 2.5V

Ω

05143-051

05143-053

Rev. A | Page 14 of 16

ADA4851-1/ADA4851-4

OUTLINE DIMENSIONS

2.90 BSC

4526

1.60 BSC

PIN 1

INDICATOR

1.30

1.15

0.90

0.15MAX

1 3

1.90 BSC

0.50

0.30

2.80 BSC

0.95 BSC

1.45 MAX

SEATING PLANE

0.22

0.08 10°

4° 0°

0.60

0.45

0.30

COMPLIANT TO JEDEC STANDARDS MO-178AB

Figure 43. 6-Lead Small Outline Transistor Package [SOT-23]

(RJ-6)

Dimensions shown in millimeters

5.10

5.00

4.90

1.05

1.00

0.80

4.50

4.40

4.30

PIN 1

14

0.65 BSC

0.15

0.05

COMPLIANT TO JEDEC STANDARDS MO-153AB-1

0.30

0.19

8

6.40

BSC

71

1.20 MAX

SEATING PLANE

0.20

0.09

COPLANARITY

0.10

8° 0°

0.75

0.60

0.45

Figure 44. 14-Lead Thin Shrink Small Outline Package [TSSOP]

(RU-14)

Dimensions shown in millimeters

ORDERING GUIDE

Model Temperature Range Package Description Package Outline Branding

ADA4851-1YRJZ-R2 ADA4851-1YRJZ-RL1 −40°C to +125°C 6-Lead Small Outline Transistor Package (SOT-23) RJ-6 HHB ADA4851-1YRJZ-RL71 −40°C to +125°C 6-Lead Small Outline Transistor Package (SOT-23) RJ-6 HHB ADA4851-4YRUZ1 –40°C to +125°C 14-Lead Thin Shrink Small Outline Package (TSSOP) RU-14 ADA4851-4YRUZ-RL1 –40°C to +125°C 14-Lead Thin Shrink Small Outline Package (TSSOP) RU-14 ADA4851-4YRUZ-R71 –40°C to +125°C 14-Lead Thin Shrink Small Outline Package (TSSOP) RU-14

1

Z = Pb-free part.

1

−40°C to +125°C 6-Lead Small Outline Transistor Package (SOT-23) RJ-6 HHB

Rev. A | Page 15 of 16

ADA4851-1/ADA4851-4

NOTES

D05143–0−1/05(A)

Rev. A | Page 16 of 16

Datasheet ADA4851-1 Datasheet (Analog Devices)

Specifications and Main Features

Frequently Asked Questions

User Manual

FEATURES

APPLICATIONS

PIN CONFIGURATIONS

GENERAL DESCRIPTION

TABLE OF CONTENTS

SPECIFICATIONS

SPECIFICATIONS WITH +3 V SUPPLY

SPECIFICATIONS WITH +5 V SUPPLY

SPECIFICATIONS WITH ±5 V SUPPLY

ABSOLUTE MAXIMUM RATINGS

THERMAL RESISTANCE

Maximum Power Dissipation

ESD CAUTION

TYPICAL PERFORMANCE CHARACTERISTICS

CIRCUIT DESCRIPTION

HEADROOM CONSIDERATIONS

OVERLOAD BEHAVIOR AND RECOVERY

Input

Output

OUTLINE DIMENSIONS

ORDERING GUIDE