AD734 Analog Devices, AD734 Datasheet

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AD734

Manufacturer Part Number
AD734
Description
10 MHz, 4-Quadrant Multiplier/Divider
Manufacturer
Analog Devices
Datasheet

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a
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.
PRODUCT DESCRIPTION
The AD734 is an accurate high speed, four-quadrant analog
multiplier that is pin-compatible with the industry-standard
AD534 and provides the transfer function W = XY/U. The
AD734 provides a low-impedance voltage output with a full-
power (20 V pk-pk) bandwidth of 10 MHz. Total static error
(scaling, offsets, and nonlinearities combined) is 0.1% of full
scale. Distortion is typically less than –80 dBc and guaranteed.
The low capacitance X, Y and Z inputs are fully differential. In
most applications, no external components are required to
define the function.
The internal scaling (denominator) voltage U is 10 V, derived
from a buried-Zener voltage reference. A new feature provides
the option of substituting an external denominator voltage,
allowing the use of the AD734 as a two-quadrant divider with a
1000:1 denominator range and a signal bandwidth that remains
10 MHz to a gain of 20 dB, 2 MHz at a gain of 40 dB and
200 kHz at a gain of 60 dB, for a gain-bandwidth product of
200 MHz.
The advanced performance of the AD734 is achieved by a
combination of new circuit techniques, the use of a high speed
complementary bipolar process and a novel approach to laser-
trimming based on ac signals rather than the customary dc
methods. The wide bandwidth (>40 MHz) of the AD734’s
input stages and the 200 MHz gain-bandwidth product of the
multiplier core allow the AD734 to be used as a low distortion
FEATURES
High Accuracy
High Speed
Low Distortion
Low Noise
Direct Division Mode
APPLICATIONS
High Performance Replacement for AD534
Multiply, Divide, Square, Square Root
Modulator, Demodulator
Wideband Gain Control, RMS-DC Conversion
Voltage-Controlled Amplifiers, Oscillators, and Filters
Demodulator with 40 MHz Input Bandwidth
0.1% Typical Error
10 MHz Full-Power Bandwidth
450 V/ s Slew Rate
200 ns Settling to 0.1% at Full Power
–80 dBc from Any Input
Third-Order IMD Typically –75 dBc at 10 MHz
94 dB SNR, 10 Hz to 20 kHz
70 dB SNR, 10 Hz to 10 MHz
2 MHz BW at Gain of 100
demodulator with input frequencies as high as 40 MHz as long
as the desired output frequency is less than 10 MHz.
The AD734AQ and AD734BQ are specified for the industrial
temperature range of –40 C to +85 C and come in a 14-lead
ceramic DIP. The AD734SQ/883B, available processed to
MIL-STD-883B for the military range of –55 C to +125 C, is
available in a 14-lead ceramic DIP.
PRODUCT HIGHLIGHTS
The AD734 embodies more than two decades of experience in
the design and manufacture of analog multipliers, to provide:
1. A new output amplifier design with more than twenty times
2. Very low distortion, even at full power, through the use of
3. Direct control of the denominator, resulting in higher
4. Very clean transient response, achieved through the use of a
5. Superior noise performance by careful choice of device
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
the slew-rate of the AD534 (450 V/ s versus 20 V/ s) for a
full power (20 V pk-pk) bandwidth of 10 MHz.
circuit and trimming techniques that virtually eliminate all of
the spurious nonlinearities found in earlier designs.
multiplier accuracy and a gain-bandwidth product at small
denominator values that is typically 200 times greater than
that of the AD534 in divider modes.
novel input stage design and wide-band output amplifier,
which also ensure that distortion remains low even at high
frequencies.
geometries and operating conditions, which provide a
guaranteed 88 dB of dynamic range in a 20 kHz bandwidth.
DENOMINATOR
INTERFACE
X INPUT
Y INPUT
(Q Package and N Package)
CONNECTION DIAGRAM
X1
X2
U0
U1
U2
Y1
Y2
World Wide Web Site: http://www.analog.com
7
1
2
3
4
5
6
10 MHz, 4-Quadrant
(Not to Scale)
14-Lead DIP
TOP VIEW
AD734
Multiplier/Divider
14
13
12
11
10
9
8
VP POSITIVE SUPPLY
DD DENOMINATOR DISABLE
W OUTPUT
Z1
Z2
ER REFERENCE VOLTAGE
VN NEGATIVE SUPPLY
© Analog Devices, Inc., 1999
Z INPUT
AD734

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AD734 Summary of contents

Page 1

... The internal scaling (denominator) voltage derived from a buried-Zener voltage reference. A new feature provides the option of substituting an external denominator voltage, allowing the use of the AD734 as a two-quadrant divider with a 1000:1 denominator range and a signal bandwidth that remains 10 MHz to a gain of 20 dB, 2 MHz at a gain and 200 kHz at a gain of 60 dB, for a gain-bandwidth product of 200 MHz ...

Page 2

... AD734–SPECIFICATIONS TRANSFER FUNCTION Parameter Conditions MULTIPLIER PERFORMANCE Transfer Function 1 Total Static Error –10 V Over MIN MAX vs. Temperature T MIN vs. Either Supply V Peak Nonlinearity –10 V – THD rms + MIN rms + MIN Feedthrough rms nulled rms nulled, f Noise (RTO Spectral Density 100 MHz ...

Page 3

... X, Y and Z Input Voltages . . . . . . . . . . . . . . . . . . . . Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite Storage Temperature Range – +150 C Operating Temperature Range AD734A, B (Industrial – +85 C AD734S (Military – +125 C Lead Temperature Range (soldering 60 sec +300 C Transistor Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 V NOTES 1 Stresses above those listed under Absolute Maximum Ratings may cause perma- nent damage to the device. This is a stress rating only ...

Page 4

... The common-mode range of the X, Y and Z inputs does not A O fully extend to the supply rails. Nevertheless often possible AD734 to operate the AD734 with one terminal of an input pair con- nected to either the positive or negative supply, unlike previous Z1 multipliers. The common-mode resistance is several megohms. ZIF – ...

Page 5

... Full details of the operation in these modes is provided in the appropriate section of this data sheet. Direct Denominator Control A valuable new feature of the AD734 is the provision to replace the internal denominator voltage, U, with any value from + +10 V. This can be used (1) to simply alter the multiplier scaling, thus improve accuracy and achieve reduced noise levels when operating with small input signals ...

Page 6

... Specifications table). OPERATION AS A MULTIPLIER All of the connection schemes used in this section are essentially identical to those used for the AD534, with which the AD734 is pin-compatible. The only precaution to be noted in this regard is that in the AD534, Pins and 13 are not internally connected and Pin 4 has a slightly different purpose ...

Page 7

... S C OPERATION AS A DIVIDER The AD734 supports two methods for performing analog division. The first is based on the use of a multiplier in a feed- back loop. This is the standard mode recommended for multipliers having a fixed scaling voltage, such as the AD534, and will be described in this Section. The second uses the AD734’ ...

Page 8

... DIVISION BY DIRECT DENOMINATOR CONTROL The AD734 may be used as an analog divider by directly vary- ing the denominator voltage. In addition to providing much higher accuracy and bandwidth, this mode also provides greater flexibility, because all inputs remain available. Figure 10 shows ...

Page 9

... This occurs when there is sufficient gain to raise the amplitude of E required to establish an output amplitude +10 V. The X input of the AD734, which has finite offset voltage, could be troublesome at the output at high gains. The output offset is reduced to that of the X input (one or two millivolts) by the offset loop comprising R3, C3, and buffer A1 ...

Page 10

... MHz. Thus, provided that the desired output signal is less than 10 MHz, as would typically be the case in demodulation, the AD734 can be used with both its X and Y input signals as high as 40 MHz. One test of mixer performance is to linearly combine two closely spaced, equal-amplitude sinusoidal signals and then mix them with a third signal to determine the mixer’ ...

Page 11

... Figure 24. PSRR vs. Frequency 0 TEST INPUT = 7V RMS –20 OTHER INPUT = 10V LOAD –40 X INPUT –60 Y INPUT –80 1k 10k 100k 1M 10M FREQUENCY – Hz Figure 27. THD vs. Frequency –11– AD734 V = 15V 1.4V RMS 0 10V R = 500 LOAD 0 20pF LOAD 0.1 0 –0.1 –0.2 –0.3 –0.4 100k 1M 10M FREQUENCY – ...

Page 12

... AD734–Typical Characteristics 15V 1.4V rms Y = 10V 500 LOAD 20pF, 47pF, LOAD INCREASING 100pF 1 C LOAD 0 –1 –2 –3 –4 –5 100k 1M 10M FREQUENCY – Hz Figure 29. Gain vs. Frequency vs. C LOAD –5 –10 –15 – SUPPLY VOLTAGE – V Figure 32. Output Swing vs. Supply ...

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