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PDF AD834 Data sheet ( Hoja de datos )
| Número de pieza | AD834 | |
| Descripción | 500 MHz Four-Quadrant Multiplier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
500 MHz Four-Quadrant Multiplier
AD834
FEATURES
DC to >500 MHz operation
Differential ±1 V full-scale inputs
Differential ±4 mA full-scale output current
Low distortion (≤0.05% for 0 dBm input)
Supply voltages from ±4 V to ±9 V
Low power (280 mW typical at VS = ±5 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
GENERAL DESCRIPTION
The AD834 is a monolithic, laser-trimmed four-quadrant analog
multiplier intended for use in high frequency applications, with
a transconductance bandwidth (RL = 50 Ω) in excess of 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 band gap 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 measure-
ment), 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 AD834 devices
to be summed with precisely equal weighting, independent of
the accuracy of the load circuit.
The AD834J, available in 8-lead PDIP and plastic SOIC packages, is
specified over the commercial temperature range of 0°C to 70°C.
The AD834A is also available in 8-lead CERDIP and plastic SOIC
packages operating over the industrial temperature range of
−40°C to +85°C. The AD834SQ/883B, available in an 8-lead
X1 7
X2 8
Y2 2
Y1 1
FUNCTIONAL BLOCK DIAGRAM
V TO I
AD834
8.5mA
5 W1
DISTORTION
CANCELLATION
DISTORTION
CANCELLATION
V TO I
CURRENT
AMPLIFIER
(W)
±4mA
FS
8.5mA
4
W2
Figure 1.
CERDIP, operates over the military temperature range of −55°C
to +125°C. S-grade chips are also available.
Two application notes featuring the AD834 (AN-212 and AN-216)
can be found at www.analog.com. For additional applications
circuits, consult the AD811 data sheet.
PRODUCT HIGHLIGHTS
1. 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 by packaging
and external board layout considerations. Obtains a large
signal bandwidth of >500 MHz under optimum conditions.
2. 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. 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. F
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2012 Analog Devices, Inc. All rights reserved.
1 page  
AD834
Parameters
POWER SUPPLIES
Operating Range
Quiescent Current6
+VS
–VS
Conditions
TMIN to TMAX
Data Sheet
Min Typ Max Unit
±4 ±9 V
11 14 mA
28 35 mA
1 Error is defined as the maximum deviation from the ideal output, and expressed as a percentage of the full-scale output. See Figure 16.
2 Both supplies taken simultaneously; sinusoidal input at f ≤10 kHz.
3 Linearity is defined as residual error after compensating for input offset voltage, output offset current, and scaling current errors.
4 Bandwidth is guaranteed when configured in squarer mode. See Figure 12.
5 Sine input; relative to full-scale output; zero input port nulled; represents feedthrough of the fundamental.
6 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.
Rev. F | Page 4 of 20
5 Page 
AD834
EXPLANATION OF TYPICAL PERFORMANCE
CHARACTERISTICS AND TEST CIRCUITS
Figure 4 is a plot of the mean-square output vs. frequency for
the test circuit of Figure 8. Note that the rising response is due
to package resonances.
For frequencies above 1 MHz, ac feedthrough is dominated by
static nonlinearities in the transfer function and the finite offset
voltages. The offset voltages cause a small fraction of the funda-
mental to appear at the output, and can be nulled out (see
Figure 5).
THD data represented in Figure 6 is dominated by the second
harmonic, and is generated with 0 dBm input on the ac input
and 1 V on the dc input. For a given amplitude on the ac input,
THD is relatively insensitive to changes in the dc input ampli-
tude. Varying the ac input amplitude while maintaining a
constant dc input amplitude affects THD performance.
Data Sheet
The squarer configuration shown in Figure 8 is used to determine
wideband performance because it eliminates the need for (and
the response uncertainties of) a wideband measurement device
at the output. The wideband output of a squarer configuration
is a fluctuating current at twice the input frequency with a mean
value proportional to the square of the input amplitude.
By placing the capacitors, C3/C5 and C4/C6, across the load
resistors, R1 and R2, a simple low-pass filter is formed, and the
mean-square value is extracted. The mean-square response can
be measured using a DVM connected across R1 and R2.
Care should be taken when laying out the board. When using
the DIP package, mount the IC socket on a ground plane with a
clear area in the rectangle formed by the pins. This is important
because significant transformer action can arise if the pins pass
through individual holes in the board; improperly constructed test
jigs have caused oscillation at 1.3 GHz.
Rev. F | Page 10 of 20
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet AD834.PDF ] | |
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