Wideband Dual-Channel
Linear Multiplier/Divider
AD539
FEATURES
APPLICATIONS
Precise high bandwidth AGC and VCA systems
Voltage-controlled filters
Video signal processing
High speed analog division
Automatic signal-leveling
Square-law gain/loss control
FUNCTIONAL BLOCK DIAGRAM
AD539
VY1
×
6kΩ
W1
CHAN1 OUTPUT
6kΩ
Z1
VX
6kΩ
VY2
×
Z2
CHAN2 OUTPUT
6kΩ
W2
09679-001
2-quadrant multiplication/division
2 independent signal channels
Signal bandwidth of 60 MHz (IOUT)
Linear control channel bandwidth of 5 MHz
Low distortion (to 0.01%)
Fully calibrated, monolithic circuit
Figure 1.
GENERAL DESCRIPTION
The AD539 is a low distortion analog multiplier having two
identical signal channels (Y1 and Y2), with a common X input
providing linear control of gain. Excellent ac characteristics up
to video frequencies and a −3 dB bandwidth of over 60 MHz are
provided. Although intended primarily for applications where
speed is important, the circuit exhibits good static accuracy in
computational applications. Scaling is accurately determined by
a band-gap voltage reference and all critical parameters are
laser-trimmed during manufacture.
The full bandwidth can be realized over most of the gain range
using the AD539 with simple resistive loads of up to 100 Ω.
Output voltage is restricted to a few hundred millivolts under
these conditions.
The two channels provide flexibility. In single-channel applications,
they can be used in parallel to double the output current, in
series to achieve a square-law gain function with a control range of
over 100 dB, or differentially to reduce distortion. Alternatively,
they can be used independently, as in audio stereo applications,
with low crosstalk between channels. Voltage-controlled filters
and oscillators using the state-variable approach are easily
designed, taking advantage of the dual channels and common
control. The AD539 can also be configured as a divider with
signal bandwidths up to 15 MHz.
Power consumption is only 135 mW using the recommended
±5 V supplies. The AD539 is available in three versions: the J
and K grades are specified for 0 to 70°C operation and S grade is
guaranteed over the extended range of −55°C to +125°C. The J and
K grades are available in either a hermetic ceramic SBDIP (D-16)
or a low cost PDIP (N-16), whereas the S grade is available in
ceramic SBDIP (D-16) or LCC (E-20-1). The S grade is available in MIL-STD-883 and Standard Military Drawing (DESC)
Number 5962-8980901EA versions.
Rev. B
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