AD831AP Analog Devices Inc, AD831AP Datasheet

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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PRODUCT DESCRIPTION
The AD831 is a low distortion, wide dynamic range, monolithic
mixer for use in such applications as RF to IF downconversion
in HF and VHF receivers, the second mixer in DMR base sta-
tions, direct-to-baseband conversion, quadrature modulation and
demodulation, and doppler shift detection in ultrasound imaging
applications. The mixer includes an LO driver and a low noise
output amplifier and provides both user-programmable power
consumption and third order intercept point.
The AD831 provides a +24 dBm third order intercept point for
–10 dBm LO power, thus improving system performance and
reducing system cost compared to passive mixers, by eliminating
the need for a high power LO driver and its attendant shielding
and isolation problems.
The RF, IF, and LO ports may be dc or ac coupled when the
mixer is operating from ±5 V supplies or ac coupled when oper-
ating from a single-supply of 9 V minimum. The mixer operates
with RF and LO inputs as high as 500 MHz.
The mixer’s IF output is available as either a differential current
output or a single-ended voltage output. The differential output is
from a pair of open collectors and may be ac coupled via a trans-
former or capacitor to provide a 250 MHz output bandwidth. In
downconversion applications, a single capacitor connected across
these outputs implements a low-pass filter to reduce harmonics
directly at the mixer core, simplifying output filtering. When
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
that may result from its use. No license is granted by implication or oth-
erwise under any patent or patent rights of Analog Devices.Trademarks
and registered trademarks are the property of their respective companies.
FEATURES
Doubly Balanced Mixer
Low Distortion
Low LO Drive Required: –10 dBm
Bandwidth
Single- or Dual-Supply Operation
DC Coupled Using Dual Supplies
User-Programmable Power Consumption
APPLICATIONS
High Performance RF/IF Mixer
Direct to Baseband Conversion
Image-Reject Mixers
I/Q Modulators and Demodulators
All Ports May Be DC Coupled
+24 dBm Third Order Intercept (IP3)
+10 dBm 1 dB Compression Point
500 MHz RF and LO Input Bandwidths
250 MHz Differential Current IF Output
DC to >200 MHz Single-Ended Voltage IF Output
No Lower Frequency Limit—Operation to DC
building a quadrature-amplitude modulator or image reject mixer,
the differential current outputs of two AD831s may be summed
by connecting them together.
An integral low noise amplifier provides a single-ended voltage
output and can drive such low impedance loads as filters, 50 
amplifier inputs, and A/D converters. Its small signal bandwidth
exceeds 200 MHz. A single resistor connected between pins
OUT and FB sets its gain. The amplifier’s low dc offset allows
its use in such direct-coupled applications as direct-to-baseband
conversion and quadrature-amplitude demodulation.
The mixer’s SSB noise figure is 10.3 dB at 70 MHz using its
output amplifier and optimum source impedance. Unlike passive
mixers, the AD831 has no insertion loss and does not require an
external diplexer or passive termination.
A programmable-bias feature allows the user to reduce power
consumption, with a reduction in the 1 dB compression point and
third-order intercept.This permits a tradeoff between dynamic
range and power consumption. For example, the AD831 may be
used as a second mixer in cellular and two-way radio base stations
at reduced power while still providing a substantial performance
improvement over passive solutions.
PRODUCT HIGHLIGHTS
1. –10 dBm LO Drive for a +24 dBm Output Referred Third
2. Single-Ended Voltage Output
3. High Port-to-Port Isolation
4. No Insertion Loss
5. Single- or Dual-Supply Operation
6. 10.3 dB Noise Figure
One Technology Way, P .O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
Order Intercept Point
FUNCTIONAL BLOCK DIAGRAM
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Low Distortion Mixer
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www.analog.com

AD831AP Summary of contents

Page 1

FEATURES Doubly Balanced Mixer Low Distortion +24 dBm Third Order Intercept (IP3) +10 dBm 1 dB Compression Point Low LO Drive Required: –10 dBm Bandwidth 500 MHz RF and LO Input Bandwidths 250 MHz Differential Current IF Output DC to ...

Page 2

AD831–SPECIFICATIONS Parameter RF INPUT Bandwidth 1 dB Compression Point Common-Mode Range Bias Current DC Input Resistance Capacitance IF OUTPUT Bandwidth Conversion Gain Output Offset Voltage Slew Rate Output Voltage Swing Short Circuit Current LO INPUT Bandwidth Maximum Input Level Common-Mode ...

Page 3

... Operating Temperature Range AD831A . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C Storage Temperature Range . . . . . . . . . . . . . . –65°C to +150°C Lead Temperature Range (Soldering 60 sec 300°C Model AD831AP AD831AP-REEL7 AD831AP-EB PIN CONFIGURATION 20-Lead PLCC � � � �� �� ...

Page 4

AD831–Typical Performance Characteristics �� �� �� �� �� � � �� ��� ��������������� TPC 1.Third Order Intercept vs. Frequency, IF Held Constant at 10.7 MHz 100 FREQUENCY (MHz) TPC 2. ...

Page 5

FREQUENCY (MHz) TPC Compression Point vs. Frequency, Gain = 100 FREQUENCY (MHz) TPC Compression Point vs. ...

Page 6

AD831 �� �� �� ����������������� ������������ ���������� �� � �� ��� ��� ��� ��� ��� ��������������� TPC 13. InputThird Order Intercept Single Supply ���� � � � ����� ���� � ���� ���� � � � ����� � ���� ...

Page 7

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 ...

Page 8

AD831 The mixer has two open-collector outputs (differential currents) at pins IFN and IFP.These currents may be used to provide nominal unity gain by connecting a center-tapped transformer (1:1 turns ratio) to pins IFN and IFP as ...

Page 9

For gains other than unity, the amplifier’s output at OUT is connected via an attenuator network to VFB; this determines the overall gain. Using resistors R1 and R2 (Figure 6), the gain setting expression is Ê + ˆ ...

Page 10

AD831 APPLICATIONS Careful component selection, circuit layout, power supply dc coupling, and shielding are needed to minimize the AD831’s susceptibility to interference from radio and TV stations, etc. In bench evaluation, we recommend placing all of the components in a ...

Page 11

Single-Supply Operation Figure 10 is similar to the dual-supply circuit in Figure 9. Supplies may be as low but should not be higher than 11 V, due to power dissipation Figure 9, both the RF ...

Page 12

AD831 Connections Quadrature Demodulation Two AD831 mixers may have their RF inputs connected in parallel and have their LO inputs driven in phase quadrature (Figure 11) to provide demodulated in-phase (I) and quadrature (Q) outputs. �� ����� ����� Figure 11. ...

Page 13

Table I. AD831 Mixer Table, 4.5 V Supplies –9 dBm LO Level –9.0 dBm, LO Frequency 130.7 MHz, Data File imdTB10771 RF Level 0.0 dBm, RF Frequency 120 MHz Temperature Ambient Dut Supply ±4.50 V VPOS Current 90 ...

Page 14

AD831 Table III. AD831 Mixer Table, 3.5 V Supplies –20 dBm LO Level –20.0 dBm, LO Frequency 130.7 MHz, Data File G1T1K 0771 RF Level 0.0 dBm, RF Frequency 120 MHz Temperature Ambient Dut Supply ±3.50 V VPOS ...

Page 15

Figure 12. Third Order Intercept Characterization Setup �������� ����������� ���������������� REV. C �������� ������������ ������������ ��� ��� ����� ��� ∑ �������� ������������ �������� �� ����������� ������� ����������� ��������������� ���������������� ������� ���������� �������� �������� ������������ ...

Page 16

AD831 0.048 (1.21) 0.042 (1.07) 3 0.048 (1.21) 4 0.042 (1.07) TOP VIEW (PINS DOWN 0.020 (0.50) 0.356 (9.04) R 0.350 (8.89) SQ 0.395 (10.02) 0.385 (9.78) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF ...

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