ANALOG DEVICES AD818 Service Manual

Low Cost, Low Power

Video Op Amp

AD818

FEATURES
Low Cost
Excellent Video Performance

55 MHz 0.1 dB Bandwidth (Gain = +2)

0.01% and 0.05ⴗ Differential Gain and Phase Errors

High Speed

130 MHz Bandwidth (3 dB, G = +2)
100 MHz Bandwidth (3 dB, G+ = –1)
500 V/␮s Slew Rate
80 ns Settling Time to 0.01% (V

= 10 V Step)

O

High Output Drive Capability

50 mA Minimum Output Current
Ideal for Driving Back Terminated Cables

Flexible Power Supply

Specified for Single (+5 V) and Dual (ⴞ5 V to ⴞ15 V)

Power Supplies

Low Power: 7.5 mA Max Supply Current

Available in 8-Lead SOIC and 8-Lead PDIP

GENERAL DESCRIPTION

The AD818 is a low cost video op amp optimized for use in
video applications that require gains equal to or greater than +2
or –1. The AD818’s low differential gain and phase errors,
single supply functionality, low power, and high output drive
make it ideal for cable driving applications such as video
cameras and professional video equipment.

With video specs like 0.1 dB flatness to 55 MHz and low differ­ential gain and phase errors of 0.01% and 0.05∞, along with
50 mA of output current, the AD818 is an excellent choice for

+15V

CONNECTION DIAGRAM

8-Lead Plastic Mini-DIP (N) and SOIC (R) Packages

NULL

–IN

+IN

–V

1

2

3

4

S

NC = NO CONNECT

AD818

TOP VIEW

8

7

6

5

NULL

+V

S

OUTPUT

NC

any video application. The 130 MHz 3 dB bandwidth (G = +2)
and 500 V/ms slew rate make the AD818 useful in many high speed
applications including video monitors, CATV, color copiers,
image scanners, and fax machines.

The AD818 is fully specified for operation with a single +5 V
power supply and with dual supplies from ±5 V to ±15 V. This
power supply flexibility, coupled with a very low supply current
of 7.5 mA and excellent ac characteristics under all power sup­ply conditions, make the AD818 the ideal choice for many
demanding yet power sensitive applications.

The AD818 is a voltage feedback op amp and excels as a gain
stage in high speed and video systems (gain ≥ 2, or gain £ –1). It
achieves a settling time of 45 ns to 0.1%, with a low input offset
voltage of 2 mV max.

The AD818 is available in low cost, small 8-lead PDIP and
SOIC packages.

0.01␮F 2.2␮F

R

V

IN

AD818

0.1␮F

–15V

1k⍀

1k⍀

2.2␮F

75⍀

BT

75⍀

R

T

75⍀

Figure 1. Video Line Driver

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. 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 companies.

0.02

DIFF GAIN

0.06

0.05

0.04

0.03

DIFFERENTIAL PHASE (Degrees)

510

DIFF PHASE

SUPPLY VOLTAGE (ⴞV)

0.01

0.00

DIFFERENTIAL GAIN (%)

15

Figure 2. Differential Gain and Phase vs. Supply

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] © 2003 Analog Devices, Inc. All rights reserved.

AD818–SPECIFICATIONS

(@ TA = 25ⴗC, unless otherwise noted.)

AD818A

Parameter Conditions V

S

Min Typ Max Unit

DYNAMIC PERFORMANCE

–3 dB Bandwidth Gain = +2 ±5 V 70 95 MHz

±15 V 100 130 MHz
0 V, +5 V 40 55 MHz

Gain = –1 ±5 V 50 70 MHz

±15 V 70 100 MHz
0 V, +5 V 30 50 MHz

Bandwidth for 0.1 dB Flatness Gain = +2 ±5 V 20 43 MHz

= 2 pF ± 15 V 40 55 MHz

C

C

0 V, +5 V 10 18 MHz

Gain = –1 ±5 V 18 34 MHz

= 2 pF ± 15 V 40 72 MHz

C

C

0 V, +5 V 10 19 MHz

Full Power Bandwidth* V

Slew Rate R

= 5 V p-p

OUT

R

= 500 W±5 V 25.5 MHz

LOAD

= 20 V p-p

V

OUT

R

= 1 kW±15 V 8.0 MHz

LOAD

= 1 kW±5 V 350 400 V/ms

LOAD

Gain = –1 ±15 V 450 500 V/ms

0 V, +5 V 250 300 V/ms

Settling Time to 0.1% –2.5 V to +2.5 V ±5 V 45 ns

0 V–10 V Step, A

= –1 ±15 V 45 ns

V

Settling Time to 0.01% –2.5 V to +2.5 V ±5 V 80 ns

= –1 ±15 V 80 ns

V

Total Harmonic Distortion F

0 V–10 V Step, A

= 1 MHz ±15 V 63 dB

C

Differential Gain Error NTSC ±15 V 0.005 0.01 %

= 150 W)Gain = +2 ±5 V 0.01 0.02 %

(R

L

0 V, +5 V 0.08 %

Differential Phase Error NTSC ±15 V 0.045 0.09 Degrees

= 150 W)Gain = +2 ±5 V 0.06 0.09 Degrees

(R

L

0 V, +5 V 0.1 Degrees

Cap Load Drive 10 pF

INPUT OFFSET VOLTAGE ±5 V to ± 15 V 0.5 2 mV

T

MIN

to T

MAX

3mV

Offset Drift 10 mV/∞C

INPUT BIAS CURRENT ±5 V, ± 15 V 3.3 6.6 mA

T
T

MIN

MAX

10 mA

4.4 mA

INPUT OFFSET CURRENT ±5 V, ± 15 V 25 300 nA

T

MIN

to T

MAX

500 nA

Offset Current Drift 0.3 nA/∞C

OPEN-LOOP GAIN V

= ±2.5 V ±5 V

OUT

R

= 500 W 35 V/mV

LOAD

to T

T
R
V
R
T
V
R

MIN

LOAD

OUT

LOAD

MIN

OUT

LOAD

MAX

= 150 W 24 V/mV

= ±10 V ±15 V

= 1 kW 69 V/mV

to T

MAX

= ±7.5 V ±15 V

= 150 W

2 V/mV

3 V/mV

(50 mA Output) 3 5 V/mV

COMMON-MODE REJECTION V

= ±2.5 V ±5 V 82 100 dB

CM

= ±12 V ±15 V 86 120 dB

V

CM

T

MIN

to T

MAX

±15 V 84 100 dB

REV. C–2–

AD818

AD818A

Parameter Conditions V

POWER SUPPLY REJECTION V

= ±5 V to ± 15 V 80 90 dB

S

T

to T

MIN

MAX

S

INPUT VOLTAGE NOISE f = 10 kHz ±5 V, ± 15 V 10 nV/÷Hz
INPUT CURRENT NOISE f = 10 kHz ±5 V, ± 15 V 1.5 pA/÷Hz

INPUT COMMON-MODE
VOLTAGE RANGE ±5 V +3.8 +4.3 V

±15 V +13 +14.3 V

0 V, +5 V +3.8 +4.3 V

OUTPUT VOLTAGE SWING R

= 500 W±5 V 3.3 3.8 ±V

LOAD

= 150 W±5 V 3.2 3.6 ±V

R

LOAD

R

= 1 kW±15 V 13.3 13.7 ±V

LOAD

R

= 500 W±15 V 12.8 13.4 ±V

LOAD

= 500 W 0 V, +5 V 1.5, 3.5 V

R

LOAD

Output Current ±15 V 50 mA

±5 V 50 mA
0 V, +5 V 30 mA

Short-Circuit Current ±15 V 90 mA

INPUT RESISTANCE 300 kW

INPUT CAPACITANCE 1.5 pF
OUTPUT RESISTANCE Open Loop 8 W

POWER SUPPLY

Operating Range Dual Supply ±2.5 ± 18 V

Single Supply +5 +36 V

Quiescent Current ±5 V 7.0 7.5 mA

T

MIN

to T

MAX

±5 V 7.5 mA
±15 V 7.5 mA

T

*Full power bandwidth = slew rate/(2p V

Specifications subject to change without notice.

PEAK

).

MIN

to T

MAX

±15 V 7.0 7.5 mA

Min Typ Max Unit

80 dB

–2.7 –3.4 V

–12 –13.4 V

+1.2 +0.9 V

REV. C

–3–

AD818

ABSOLUTE MAXIMUM RATINGS

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V

Internal Power Dissipation

2

1

Plastic (N) . . . . . . . . . . . . . . . . . . . . . . See Derating Curves

Small Outline (R) . . . . . . . . . . . . . . . . . See Derating Curves

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

S

Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . ±6 V

Output Short-Circuit Duration . . . . . . . . See Derating Curves

Storage Temperature Range (N, R) . . . . . . . . –65∞C to +125∞C

Operating Temperature Range . . . . . . . . . . . .–40∞C to +85∞C

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

NOTES

1

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.

2

Specification is for device in free air: 8-lead plastic package, ␪JA = 90∞C/W; 8-lead
SOIC package, ␪JA = 155∞C/W.

ORDERING GUIDE

Model Temperature Range Package Description Package Option

AD818AN –40∞C to +85∞C 8-Lead Plastic PDIP N-8
AD818AR –40∞C to +85∞C 8-Lead Plastic SOIC R-8
AD818AR-REEL –40∞C to +85∞C 13" Tape and Reel R-8
AD818AR-REEL7 –40∞C to +85∞C 7" Tape and Reel R-8

2.0

8-LEAD MINI-DIP PACKAGE

1.5

1.0

0.5

MAXIMUM POWER DISSIPATION (W)

0

–30

–50 90

AMBIENT TEMPERATURE (ⴗC)

8-LEAD SOIC PACKAGE

50 703010–10

TJ = 150 C

80–40 40 60200–20

Figure 3. Maximum Power Dissipation vs. Temperature
for Different Package Types

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
AD818 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.

METALLIZATION PHOTOGRAPH

Dimensions shown in inches and (mm)

OFFSET

–INPUT 2

+INPUT 3

OFFSET

NULL

1

NULL

8

+V

S

7

0.0523
(1.33)

6 OUTPUT

0.0559 (1.42)

4

–V

S

REV. C–4–

Typical Performance Characteristics–AD818

–40ⴗC

8.0

6.0
020

7.5

6.5

5

7.0

10

15

SUPPLY VOLTAGE (ⴞV)

QUIESCENT SUPPLY CURRENT (mA)

+25ⴗC

+85ⴗC

100

1

0.01
1k 10k 100M10M1M100k

0.1

10

FREQUENCY (Hz)

CLOSED-LOOP OUTPUT IMPEDANCE (⍀)

20

15

+V

CM

10

–V

CM

5

INPUT COMMON-MODE RANGE (ⴞV)

0

020

5

SUPPLY VOLTAGE (ⴞV)

10

15

TPC 1. Common-Mode Voltage Range vs. Supply

30

25

20

15

VS = ⴞ15V

20

15

10

5

OUTPUT VOLTAGE SWING (ⴞV)

0

020

TPC 4. Output Voltage Swing vs. Supply

RL = 500

5

SUPPLY VOLTAGE (ⴞV)

10

RL = 150

⍀

⍀

15

10

OUTPUT VOLTAGE SWING (V p-p)

5

0

10 10k

TPC 2. Output Voltage Swing vs. Load Resistance

600

500

400

SLEW RATE (V/␮s)

300

200

020

5

TPC 3. Slew Rate vs. Supply Voltage

VS = ⴞ5V

LOAD RESISTANCE (⍀)

10

SUPPLY VOLTAGE (ⴞV)

1k100

TPC 5. Quiescent Supply Current vs. Supply Voltage

15

TPC 6. Closed-Loop Output Impedance vs. Frequency

REV. C

–5–