Analog Devices AD783 Datasheet

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2

3

45

6

7

8

AD783

V

CC

IN

COMMON

NC

OUT

S/H

NC

V

EE

NC = NO CONNECT

X1

Complete Very High Speed

a

FEATURES
Acquisition Time to 0.01%: 250 ns Typical
Low Power Dissipation: 95 mW
Low Droop Rate: 0.02 mV/ms
Fully Specified and Tested Hold Mode Distortion
Total Harmonic Distortion: –85 dB
Aperture Jitter: 50 ps Maximum
Internal Hold Capacitor
Self-Correcting Architecture
8-Pin Mini Cerdip and SOIC Packages

PRODUCT DESCRIPTION

The AD783 is a high speed, monolithic sample-and-hold
amplifier (SHA). The AD783 offers a typical acquisition time
of 250 ns to 0.01%. The AD783 is specified and tested for hold
mode total harmonic distortion with input frequencies up to
100 kHz. The AD783 is configured as a unity gain amplifier
and uses a patented self-correcting architecture that minimizes
hold mode errors and ensures accuracy over temperature. The
AD783 is self-contained and requires no external components
or adjustments.

The AD783 retains the held value with a droop rate of 0.02 µV/
µs. Excellent linearity and hold mode dc and dynamic perfor­mance make the AD783 ideal for high speed 12- and 14-bit
analog-to-digital converters.

The AD783 is manufactured on Analog Devices’ ABCMOS
process which merges high performance, low noise bipolar
circuitry with low power CMOS to provide an accurate, high
speed, low power SHA.

The J grade device is specified for operation from 0°C to +70°C
and the A grade from –40°C to +85°C. The J and A grades are
available in 8-pin cerdip and SOIC packages. The military
temperature range version is specified for operation from –55°C
to +125°C and is available in an 8-pin cerdip package. For
details refer to the Analog Devices Military Products Databook or
AD783/883B data sheet.

*Protected by U.S. Patent Number 4,962,325.

Sample-and-Hold Amplifier

AD783*

FUNCTIONAL BLOCK DIAGRAM

PRODUCT HIGHLIGHTS

1. Fast acquisition time (250 ns), low aperture jitter (20 ps) and
fully specified hold mode distortion make the AD783 an
ideal SHA for sampling systems.

2. Low droop (0.02 µV/µs) and internally compensated hold
mode error result in superior system accuracy.

3. Low power (95 mW typical), complete functionality and
small size make the AD783 an ideal choice for a variety of
high performance applications.

4. The AD783 requires no external components or adjustments.

5. The AD783 is an excellent choice as a front-end SHA for
high speed analog-to-digital converters such as the AD671,
AD7586, AD674B, AD774B, AD7572 and AD7672.

6. Fully specified and tested hold mode distortion guarantees
the performance of the SHA in sampled data systems.

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
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] Fax: [phone]

AD783–SPECIFICA TIONS

(T

to T

DC SPECIFICATIONS

Parameter Min Typ Max Units

SAMPLING CHARACTERISTICS

Acquisition Time

5 V Step to 0.01% 250 375 ns

5 V Step to 0.1% 200 350 ns
Small Signal Bandwidth 15 MHz
Full Power Bandwidth 2 MHz

HOLD CHARACTERISTICS

Effective Aperture Delay (+25°C) –30 15 30 ns
Aperture Jitter (+25°C) 20 50 ps
Hold Settling (to 1 mV, +25°C) 150 200 ns
Droop Rate 0.02 1 µV/µs
Feedthrough (+25°C)

(VIN = ±2.5 V, 500 kHz) –80 dB

ACCURACY CHARACTERISTICS

Hold Mode Offset –5 0 +5 mV
Hold Mode Offset Drift 10 µV/°C
Sample Mode Offset 50 200 mV
Nonlinearity ±0.005 % FS
Gain Error ±0.03 ±0.1 % FS

MIN

with VCC = +5 V 6 5%, VEE = –5 V 6 5%, CL = pF, unless otherwise noted)

MAX

AD783J/A

1

OUTPUT CHARACTERISTICS

Output Drive Current –5 +5 mA
Output Resistance, DC 0.3 0.6 Ω
Total Output Noise (DC to 5 MHz) 150 µV rms
Sampled DC Uncertainty 85 µV rms
Hold Mode Noise (DC to 5 MHz) 125 µV rms
Short Circuit Current

Source 20 mA

Sink 13 mA

INPUT CHARACTERISTICS

Input Voltage Range –2.5 +2.5 V
Bias Current 100 250 nA
Input Impedance 10 MΩ
Input Capacitance 2 pF

DIGITAL CHARACTERISTICS

Input Voltage Low 0.8 V
Input Voltage High 2.0 V
Input Current High (VIN = 5 V) 2 10 µA

POWER SUPPLY CHARACTERISTICS

Operating Voltage Range ±4.75 ±5 ±5.25 V
Supply Current 9.5 17 mA
+PSRR (+5 V ± 5%) 45 65 dB
–PSRR (–5 V ± 5%) 45 65 dB
Power Consumption 95 175 mW

TEMPERATURE RANGE

Specified Performance (J) 0 +70 °C

Specified Performance (A) –40 +85 °C

NOTES

1

Specified and tested over an input range of ±2.5 V.

Specifications subject to change without notice.

–2–

REV. A

AD783

WARNING!

ESD SENSITIVE DEVICE

HOLD MODE AC SPECIFICATIONS

(T

to T

MIN

with VCC = +5 V 6 5%, VEE = –5 V 6 5%, CL = 50 pF, unless otherwise noted)

MAX

AD783J/A

Parameter Min Typ Max Units

TOTAL HARMONIC DISTORTION

f

= 100 kHz –85 –80 dB

IN

fIN = 500 kHz –72 dB

SIGNAL-TO-NOISE AND DISTORTION

f

= 100 kHz 77 dB

IN

fIN = 500 kHz 70 dB

INTERMODULATION DISTORTION

(F1 = 99 kHz, F2 = 100 kHz)
Second Order Products –80 dB
Third Order Products –85 dB

NOTES

1

fIN amplitude = 0 dB and f

Specifications subject to change without notice.

ABSOLUTE MAXIMUM RATINGS*

= 300 kHz unless otherwise indicated.

SAMPLE

PIN CONFIGURATION

With

Spec Respect to Min Max Units

V

CC

V

EE

COM –0.5 +6.5 V

COM –6.5 +0.5 V
Analog Input COM –6.5 +6.5 V
Digital Input COM –0.5 +6.5 V
Output Short Circuit to

Ground, V

CC

, or V

EE

Indefinite

Maximum Junction

Temperature +175 °C

CC

COMMON

NC

1

2

IN

3

4

NC = NO CONNECT

AD783

TOP VIEW

(Not to Scale)

8

OUT

7

S/H

6

NC

V

5

EE

V

Storage –65 +150 °C
Lead Temperature

(10 sec max) +300 °C

*Stresses above those listed under “Absolute Maximum Ratings” may cause

permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in the
operational section of this specification is not implied.

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 AD783 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

ORDERING GUIDE

Temperature Package
Range Description Options

2

Model

1

AD783JQ 0°C to +70°C 8-Pin Cerdip Q-8
AD783AQ –40°C to +85°C 8-Pin Cerdip Q-8
AD783JR 0°C to +70°C 8-Pin SOIC R-8
AD783AR –40°C to +85°C 8-Pin SOIC R-8

NOTES

1

For details on grade and package offerings screened in accordance with MIL-STD-883, refer to the

1

Analog Devices Military Products Databook or current AD783/883B data sheet.

2

Q = Cerdip, R = SOIC.

–3–