Analog Devices AD834 Datasheet

500 MHz Four-Quadrant Multiplier

AD834

FEATURES DC to >500 MHz Operation Differential ⴞ1 V Full-Scale Inputs Differential ⴞ4 mA Full-Scale Output Current Low Distortion (≤0.05% for 0 dBm Input) Supply Voltages from ⴞ4 V to ⴞ9 V Low Power (280 mW typical at V

APPLICATIONS High Speed Real Time Computation Wideband Modulation and Gain Control Signal Correlation and RF Power Measurement Voltage Controlled Filters and Oscillators Linear Keyers for High Resolution Television Wideband True RMS

PRODUCT DESCRIPTION

The AD834 is a monolithic laser-trimmed four-quadrant analog multiplier intended for use in high frequency applications, having a transconductance bandwidth (R 500 MHz from either of the differential voltage inputs. In multiplier modes, the typical total full-scale error is 0.5%, dependent on the application mode and the external circuitry. Performance is relatively insensitive to temperature and supply variations, due to the use of stable biasing based on a bandgap reference generator and other design features.

To preserve the full bandwidth potential of the high speed bipolar process used to fabricate the AD834, the outputs appear as a differential pair of currents at open collectors. To provide a single ended ground referenced voltage output, some form of external current to voltage conversion is needed. This may take the form of a wideband transformer, balun, or active circuitry such as an op amp. In some applications (such as power measurement) the subsequent signal processing may not need to have high bandwidth.

The transfer function is accurately trimmed such that when X = Y = ±1 V, the differential output is ±4 mA. This absolute calibration allows the outputs of two or more AD834s to be summed with precisely equal weighting, independent of the accuracy of the load circuit.

The AD834J is specified for use over the commercial temperature range of 0°C to +70°C and is available in an 8-lead DIP package and an 8-lead plastic SOIC package. AD834A is available in cerdip and 8-lead plastic SOIC packages for operation over the industrial temperature range of –40°C to +85°C. The AD834S/883B is specified for operation over the military temperature range of –55°C to +125°C and is available in the 8-lead cerdip package. S-Grade chips are also available.

= ⴞ5 V)

= 50 Ω) in excess of

FUNCTIONAL BLOCK DIAGRAM

(W)

Two application notes featuring the AD834 (AN-212 and AN-216) can now be obtained by calling 1-800-ANALOG-D. For additional applications circuits consult the AD811 data sheet.

PRODUCT HIGHLIGHTS

l. The AD834 combines high static accuracy (low input and

output offsets and accurate scale factor) with very high bandwidth. As a four-quadrant multiplier or squarer, the response extends from dc to an upper frequency limited mainly by packaging and external board layout considerations. A large signal bandwidth of over 500 MHz is attainable under optimum conditions.

2. The AD834 can be used in many high speed nonlinear operations, such as square rooting, analog division, vector addition and rms-to-dc conversion. In these modes, the bandwidth is limited by the external active components.

3. Special design techniques result in low distortion levels (better than –60 dB on either input) at high frequencies and low signal feedthrough (typically –65 dB up to 20 MHz).

4. The AD834 exhibits low differential phase error over the input range—typically 0.08° at 5 MHz and 0.8° at 50 MHz. The large signal transient response is free from overshoot, and has an intrinsic rise time of 500 ps, typically settling to within 1% in under 5 ns.

5. The nonloading, high impedance, differential inputs simplify the application of the AD834.

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 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: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000

AD834–SPECIFICATIONS

(TA = +25ⴗC and ⴞVS = ⴞ5 V, unless otherwise noted; dBm assumes 50 ⍀ load.)

Model Conditions Min Typ Max Min Typ Max Units

AD834J AD834A, S

MULTIPLIER PERFORMANCE

Transfer Function

Total Error1 (Figure 6) –1 V ≤ X, Y < +1 V ±0.5 ⴞ2 ±0.5 ⴞ2 % FS

vs. Temperature T

vs. Supplies Linearity Bandwidth

to T

MIN

MAX

±4 V to ±6 V 0.1 0.3 0.1 0.3 % FS/V

See Figure 5 500 500 MHz

W =

±0.5 ⴞ1 ± 0.5 ⴞ1 % FS

(1V )

× 4 mA

W =

(1V )

× 4 mA

±1.5 ⴞ3 % FS

Feedthrough, X X = ±1 V, Y = Nulled 0.2 0.3 0.2 0.3 % FS Feedthrough, Y X = Nulled, Y = ± 1 V 0.1 0.2 0.1 0.2 % FS AC Feedthrough, X

X = 0 dBm, Y = Nulled f = 10 MHz –65 –65 dB

AC Feedthrough, Y

f = 100 MHz –50 –50 dB X = Nulled, Y = 0 dBm f = 10 MHz –70 –70 dB f = 100 MHz –50 –50 dB

INPUTS (X1, X2, Y1, Y2)

Full-Scale Range Differential ±1 ±1V Clipping Level Differential ⴞ1.1 ±1.3 ⴞ1.1 ±1.3 V Input Resistance Differential 25 25 kΩ Offset Voltage 0.5 3 0.5 3 mV

vs. Temperature T

vs. Supplies

MIN

to T

MAX

10 10 µV/°C

44mV

±4 V to ±6 V 100 300 100 300 µV/V Bias Current 45 45 µA Common-Mode Rejection f ≤ 100 kHz; 1 V p-p 70 70 dB Nonlinearity, X Y = 1 V; X = ±1 V 0.2 0.5 0.2 0.5 % FS Nonlinearity, Y X = 1 V; Y = ± 1 V 0.1 0.3 0.1 0.3 % FS Distortion, X X = 0 dBm, Y = 1 V

f = 10 MHz –60 –60 dB

f = 100 MHz –44 –44 dB Distortion, Y X = 1 V, Y = 0 dBm

f = 10 MHz –65 –65 dB

f = 100 MHz –50 –50 dB

OUTPUTS (W1, W2)

Zero Signal Current Each Output 8.5 8.5 mA Differential Offset X = 0, Y = 0 ±20 ⴞ60 ±20 ⴞ60 µA

vs. Temperature T

MIN

to T

MAX

40 40 nA/°C

ⴞ60 µA

Scaling Current Differential 3.96 4 4.04 3.96 4 4.04 mA Output Compliance 4.75 9 4.75 9 V Noise Spectral Density f = 10 Hz to 1 MHz 16 16 nV/√Hz

Outputs into 50 Ω Load

POWER SUPPLIES

Operating Range ±4 ±9 ±4 ±9V Quiescent Current

–V

to T

MIN

MAX

11 14 11 14 mA 28 35 28 35 mA

TEMPERATURE RANGE

Operating, Rated Performance

Commercial (0°C to +70°C) AD834J Military (–55°C to +125°C) AD834S Industrial (–40°C to +85°C) AD834A

PACKAGE OPTIONS

8-Pin SOIC (R) AD834JR, REEL, REEL7 AD834AR 8-Pin Cerdip (Q) AD834AQ, SQ/883B 8-Pin Plastic DIP (N) AD834JN

NOTES

Error is defined as the maximum deviation from the ideal output, and expressed as a percentage of the full-scale output.

Both supplies taken simultaneously; sinusoidal input at f ≤ 10 kHz.

Linearity is defined as residual error after compensating for input offset voltage, output offset current and scaling current errors.

Bandwidth is guaranteed when configured in squarer mode. See Figure 5.

Sine input; relative to full-scale output; zero input port nulled; represents feedthrough of the fundamental.

Negative supply current is equal to the sum of positive supply current, the signal currents into each output, W1 and W2, and the input bias currents.

Specifications in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. Specifications subject to c

hange without notice.

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AD834

ABSOLUTE MAXIMUM RATINGS*

Supply Voltage (+VS to –VS) . . . . . . . . . . . . . . . . . . . . . . 18 V

Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . 500 mW

Input Voltages (X1, X2, Y1, Y2) . . . . . . . . . . . . . . . . . . . .+V

Operating Temperature Range

AD834J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C

AD834A . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C

AD834S/883B . . . . . . . . . . . . . . . . . . . . . –55°C to +125°C

Storage Temperature Range (Q) . . . . . . . . . –65°C to +150°C

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

Lead Temperature (Soldering 60 sec) . . . . . . . . . . . . .+300°C

ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 V

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

nent damage to the devices. 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 CHARACTERISTICS

␪

8-Pin Cerdip Package (Q) 30°C/W 110°C/W 8-Pin Plastic SOIC (R) 45°C/W 165°C/W 8-Pin Plastic Mini-DIP (N) 50°C/W 99°C/W

ORDERING GUIDE

Temperature Package

Model Range Option*

AD834JN 0°C to +70°C N-8 AD834JR 0°C to +70°C SO-8 AD834JR-REEL 0°C to +70°C SO-8 AD834JR-REEL7 0°C to +70°C SO-8 AD834AR –40°C to +85°C SO-8 AD834AQ –40°C to +85°C Q-8 AD834SQ/883B –55°C to +125°C Q-8 AD834S CHIPS –55°C to +125°C DIE

*N = Plastic DIP; Q = Cerdip; SO = Small Outline IC (SOIC) Package.

CONNECTION DIAGRAM

Small Outline (R) Package

Plastic DIP (N) Package

Cerdip (Q) Package

METALIZATION PHOTOGRAPH

CHIP DIMENSIONS AND BONDING DIAGRAM

Dimensions shown in inches and (mm).

Contact factory for latest dimensions.

0.0098 (0.25)

0.0040 (0.10)

REV. C

0.1574 (4.00)

0.1497 (3.80)

PIN 1

SEATING

PLANE

Small Outline (SO-8) Package

0.1968 (5.00)

0.1890 (4.80)

0.0500 (1.27)

0.2440 (6.20)

0.2284 (5.80)

BSC

0.0192 (0.49)

0.0138 (0.35)

0.0688 (1.75)

0.0532 (1.35)

0.0098 (0.25)

0.0075 (0.19)

0.0196 (0.50)

0.0099 (0.25)

8ⴗ

0.0500 (1.27)

0ⴗ

0.0160 (0.41)

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

Cerdip (Q) Package

ⴛ 45ⴗ

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