Analog Devices AD8024 Datasheet

Quad 350 MHz

a

FEATURES
Quad High-Speed Current Feedback Amplifier

with Disable
–3 dB Bandwidth 350 MHz @ G = 1
Slew Rate 2400 V/s, V

Drives High Capacitive Loads

Settling Time to 0.1% in 35 ns; 300 pF Load, 6 V Step
Settling Time to 0.1% in 18 ns; 5 pF Load, 2 V Step

Low Power

Operates on +5 V to 12 V (+24 V)
4 mA/Amplifier Supply Current

Excellent Video Specs (R

Gain Flatness 0.1 dB to 70 MHz

0.04% Differential Gain

0.09 Differential Phase
Crosstalk –58 dB @ 5 MHz
THD –72 dBc @ 5 MHz
Outstanding DC Accuracy

is 2 mV (Typ)

V

OFFSET

is 3 A (Max)

I

BIAS

16-Lead SOIC Package

= 12 V

S

= 150 , G = 2)

L

24 V Amplifier

AD8024

FUNCTIONAL BLOCK DIAGRAM

V

DIS

1

2

3

4

CC

5

6

7

8

AD8024AR

16

15

14

13

12

11

10

9

V

EE

DGND

APPLICATIONS
LCD Column Drivers
High-Performance Test Equipment
Video Line Driver
ATE

PRODUCT DESCRIPTION

The AD8024 is a low settling time, high-speed, high output
voltage quad current feedback operational amplifier. Manu­factured on ADI’s proprietary XFHV high-speed bipolar process,
the AD8024 is capable of driving to within 1.3 V of its 24 V
supply rail. Each amplifier has high-output current capability
and can drive high capacitive loads.

The AD8024 outputs settle to 0.1% within 35 ns into a 300 pF
load (6 V swing). The AD8024 can run on both +5 V as well as
± 12 V rails. Slew rate on ± 12 V supplies is 2400 V/µs. DC
Characteristics are outstanding with typical 2 mV offset, and
3 µA maximum input bias current. High-speed disable pin
allows the AD8024 to be shut down when not in use. Low-power
operation is assured with the 4 mA/Amplifier supply current draw.

The high voltage drive capability, low settling time, high slew
rate, low offset, and high bandwidth make the AD8024 ideally
suited as an LCD column driver, a video line driver, and for
use in high-performance test equipment.

The AD8024 is available in a 16-lead SOIC package.

1V 20ns

V

IN

V

OUT

2V

Figure 1. Pulse Response Driving a Large Load Capaci­tance, C
R

L

= 300 pF, G = 3, RFB = 2.32 kΩ, RS = 10.5 Ω,

L

= 1 kΩ, VS = ±7.5 V

REV. B

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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 2000

AD8024–SPECIFICATIONS

(@ TA = 25C, VS = 7.5 V, C

= 10 pF, RL = 150 , unless otherwise noted)

LOAD

Model Conditions Min Typ Max Unit

DYNAMIC PERFORMANCE

Bandwidth (3 dB) R

= 800 Ω, No Peaking, G = 3 160 200 MHz

FB

Bandwidth (0.1 dB) No Peaking, G = 3 25 MHz
Slew Rate 6 V Step, G = 3, C
Settling Time to 0.1% T

= 25°C to 85°C, ±3 V (6 V Step) 30 ns

A

= 300 pF, RS = 10.5 Ω, R

C

LOAD

R

= 2.32 kΩ

FB

±1 V (2 V Step), C
RS = 0 Ω, R

LOAD

= 300 pF 370 390 V/µs

LOAD

> 1 kΩ,

LOAD

= 5 pF, 18 ns

LOAD

> 1 kΩ, RFB = 750 kΩ

NOISE/HARMONIC PERFORMANCE

Total Harmonic Distortion f

= 5 MHz, RL = 1 kΩ –72 dBc

C

f

= 5 MHz, RL = 150 Ω –67 dBc

C

Input Voltage Noise f = 10 kHz 3 nV/√Hz
Input Current Noise f = 10 kHz (–I
Differential Gain (R

= 150 Ω) f = 3.58 MHz, G = 2 0.04 %

L

) 8 pA/√Hz

IN

Differential Phase (RL = 150 Ω) f = 3.58 MHz, G = 2 0.09 Degrees

DC PERFORMANCE

Input Offset Voltage T

MIN

to T

MAX

25 mV

Offset Drift 1.5 µV/°C
+Input Bias Current 1 7.5 µA
–Input Bias Current 13 µA
Open-Loop Transresistance 0.850 1.2 MΩ

T

MIN

to T

MAX

0.840 MΩ

INPUT CHARACTERISTICS

Input Resistance

+Input T
–Input T

MIN

MIN

to T
to T

MAX

MAX

1MΩ
135 Ω

Input Capacitance 2pF
Input Common-Mode Voltage –V

+ 1.2 +VS – 2 V

S

Common-Mode Rejection Ratio

Input Offset Voltage 62 66 dB
–Input Current 0.2 µA/V
+Input Current 1 µA/V

OUTPUT CHARACTERISTICS

Output Voltage Swing

R

= 1 kΩ VOL – V

L

V

R

= 150 Ω VOL – V

L

V

CC

CC

– V

– V

EE

OH

EE

OH

0.8 1.0 V

1.1 1.3 V

1.0 1.35 V

1.3 1.55 V

Linear Output Current Error <3%, R1 = 50 Ω 35 50 mA
Max Dynamic Output Current 300 mA
Capacitive Load Drive 1000 pF

MATCHING CHARACTERISTICS

Dynamic

Crosstalk (Worst Between Any 2) G = 2, f = 5 MHz –58 dB

DC

Input Offset Voltage Match 0.4 1.5 mV
Input Current Match 0.1 2.0 µA

POWER SUPPLY

Operating Range Single Supply 5 24 V

Dual Supply ±2.5 ± 12 V

Total Quiescent Current 16 17 mA

T

MIN to TMAX

19.5 mA

Disable = HIGH 0.5 1 mA

Power Supply Rejection Ratio

Input Offset Voltage V

= ±6.5 V to ±8.5 V 64 70 dB

S

–Input Current 0.03 µA/V
+Input Current 0.07 µA/V

–2–

REV. B

AD8024

WARNING!

ESD SENSITIVE DEVICE

Model Conditions Min Typ Max Unit

DISABLE CHARACTERISTICS

Off Isolation f = 6 MHz 49 dB
Off Output Impedance 20 pF
Turn-On Time 25 ns
Turn-Off Time 20 ns
Switching Threshold VTH – DGND 1.3 1.6 1.9 V

OPERATING TEMPERATURE RANGE –40 +85 °C

Specifications subject to change without notice.

ABSOLUTE MAXIMUM RATINGS*

Supply Voltage VCC – VEE................... 26 V Total

Internal Power Dissipation

Small Outline (R) ..... 1.0Watts (Observe Derating Curve)

Input Voltage (Common Mode) ................... ±V

S

Differential Input Voltage ............... ± 3 V (Clamped)

Output Voltage Limit

Maximum .................................. +V

Minimum ................................... –V

S

S

Output Short Circuit Duration

...................... Observe Power Derating Curve

Storage Temperature Range

R Package ........................ –65°C to +125°C

Operating Temperature Range

AD8024A .......................... –40°C to +85°C

Lead Temperature Range (Soldering 10 sec) ......... 300°C

*Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent 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.

ORDERING GUIDE

Model Range Description Option

AD8024AR-16 –40°C to +85°C 16-Lead Narrow-Body R-16A

Temperature Package Package

SOIC

Maximum Power Dissipation

The maximum power that can be safely dissipated by the AD8024
is limited by the associated rise in junction temperature. The
maximum safe junction temperature for the plastic encapsulated
parts is determined by the glass transition temperature of the
plastic, about 150°C. Temporarily exceeding this limit may
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.

Output Short Circuit Limit

The AD8024’s internal short circuit limitation is not sufficient
to protect the device in the event of a direct short circuit be­tween a video output and a power supply voltage rail (V

). Temporary short circuits can reduce an output’s ability to

V

EE

CC

or

source or sink current and therefore impact the device’s ability
to drive a load. Short circuits of extended duration can cause
metal lines to fuse open, rendering the device nonfunctional.

To prevent these problems, it is recommended that a series
resistor be placed as close as possible to the outputs. This will
serve to substantially reduce the magnitude of the fault currents
and protect the outputs from damage caused by intermittent
short circuits. This may not be enough 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 curve in Figure 2.

It must also be noted that in (noninverting) gain configurations
(with low values of gain resistor), a high level of input overdrive
can result in a large input error current, which may then result
in a significant power dissipation in the input stage. This power
must be included when computing the junction temperature rise
due to total internal power.

2.5

2.0

1.5

16-LEAD SOIC

1.0

MAXIMUM POWER DISSIPATION – Watts

0.5
–50 90–40 –30 –20 0 10 20 30 40 50 60 70 80

–10

AMBIENT TEMPERATURE – C

TJ = 150C

Figure 2. Maximum Power Dissipation vs. Ambient
Temperature

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
the AD8024 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. B

–3–

AD8024

–Typical Performance Characteristics

12

= 25C

T

A

10

8

–V

CM

6

+V

4

COMMON-MODE VOLTAGE – Volts

2

0

2

4 6 8 10 12

SUPPLY VOLTAGE – Volts

CM

Figure 3. Input Common-Mode Voltage Range vs.
Supply Voltage

OUTPUT VOLTAGE SWING – V

7.0

6.5

6.0

5.5

5.0

4.5

4.0

3.5

VS = 7.5V

–SWING

+SWING

25

TA = 25C

20

15

10

5

TOTAL SUPPLY CURRENT – mA

0

2

4681012
SUPPLY VOLTAGE – Volts

140

Figure 6. Total Supply Current vs. Supply Voltage

24

22

20

VS = 12V

VS = 7.5V

TOTAL SUPPLY CURRENT – mA

18

16

14

12

3.0
10

100 1k 10k

LOAD RESISTANCE – 

Figure 4. Output Voltage Swing vs. Load Resistance

25

20

15

10

5

OUTPUT VOLTAGE SWING – V p-p

0

2

TA = 25C

4681012

SUPPLY VOLTAGE – Volts

SWING

(NO LOAD)

SWING

= 150)

(R

L

1335 7911

Figure 5. Output Voltage Swing vs. Supply Voltage

10

–40

–20 0 20 40 60 100–60

TEMPERATURE – C

80

Figure 7. Total Supply Current vs. Temperature

3

VS = 7.5V

2

1

0

INPUT BIAS CURRENT – A

–1

–20 0 20 40 60 100–60 80

–40

–I

B

+I

B

TEMPERATURE – C

Figure 8. Input Bias Current vs. Temperature

–4–

REV. B