AD831AP Analog Devices Inc, AD831AP Datasheet - Page 7

LOW DISTORTION 500 MHZ MIXER IC

AD831AP

Manufacturer Part Number
AD831AP
Description
LOW DISTORTION 500 MHZ MIXER IC
Manufacturer
Analog Devices Inc
Series
AD831r
Datasheet

Specifications of AD831AP

Peak Reflow Compatible (260 C)
No
Leaded Process Compatible
No
Rohs Status
RoHS non-compliant
Rf Type
HF, VHF
Frequency
500MHz
Number Of Mixers
1
Gain
0dB
Noise Figure
14dB
Secondary Attributes
Down Converter
Current - Supply
125mA
Voltage - Supply
4.5 V ~ 5.5 V
Package / Case
20-LCC (J-Lead)
Operating Temperature (min)
-40C
Operating Temperature (max)
85C
Operating Temperature Classification
Industrial
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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THEORY OF OPERATION
The AD831 consists of a mixer core, a limiting amplifier, a low
noise output amplifier, and a bias circuit (Figure 1).
The mixer’s RF input is converted into differential currents by
a highly linear, Class A voltage-to-current converter, formed by
transistors Q1, Q2 and resistors R1, R2. The resulting currents
drive the differential pairs Q3, Q4 and Q5, Q6. The LO input is
through a high gain, low noise limiting amplifier that converts the
–10 dBm LO input into a square wave. This square wave drives
the differential pairs Q3, Q4 and Q5, Q6 and produces a high
level output at IFP and IFN—consisting of the sum and differ-
ence frequencies of the RF and LO inputs—and a series of lower
level outputs caused by odd harmonics of the LO frequency mix-
ing with the RF input.
An on-chip network supplies the bias current to the RF and LO
inputs when these are ac-coupled; this network is disabled when
the AD831 is dc-coupled.
REV. C
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Figure 1. Simplified Schematic Diagram
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When the integral output amplifier is used, pins IFN and IFP
are connected directly to pins AFN and AFP; the on-chip load
resistors convert the output current into a voltage that drives
the output amplifier. The ratio of these load resistors to resistors
R1, R2 provides nominal unity gain (0 dB) from RF-to-IF. The
expression for the gain, in decibels, is
where:
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is the amplitude of the fundamental component of a
squarewave.
is the conversion loss.
is the small signal dc gain of the AD831 when the LO input
is driven fully positive or negative.
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AD831
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