AD831AP-REEL

AD831AP-REEL Datasheet


AD831

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AD831AP-REEL AD831AP-REEL AD831AP-REEL (pdf)
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Low Distortion Mixer

AD831

FEATURES Doubly Balanced Mixer Low Distortion
+24 dBm Third Order Intercept IP3 +10 dBm 1 dB Compression Point Low LO Drive Required dBm Bandwidth 500 MHz RF and LO Input Bandwidths 250 MHz Differential Current IF Output DC to >200 MHz Single-Ended Voltage IF Output Single- or Dual-Supply Operation DC Coupled Using Dual Supplies All Ports May Be DC Coupled No Lower Frequency to DC User-Programmable Power Consumption

APPLICATIONS High Performance RF/IF Mixer Direct to Baseband Conversion Image-Reject Mixers I/Q Modulators and Demodulators

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 stations, 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 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 operating 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 transformer 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

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FUNCTIONAL BLOCK DIAGRAM
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 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 dBm LO Drive for a +24 dBm Output Referred Third

Order Intercept Point

Single-Ended Voltage Output

High Port-to-Port Isolation

No Insertion Loss

Single- or Dual-Supply Operation
dB Noise Figure

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TA = and = V unless otherwise noted all values in dBm assume 50 load.

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 Range Minimum Switching Level Bias Current Resistance Capacitance ISOLATION BETWEEN PORTS LO-to-RF LO-to-IF RF-to-IF DISTORTION AND NOISE Third Order Intercept Second Order Intercept 1 dB Compression Point Noise Figure, SSB

POWER SUPPLIES Recommended Supply Range

Quiescent Current*
*Quiescent current is programmable. Specifications subject to change without notice.

Conditions
dBm Signal Level, IP3 +20 dBm MHz IF and High Side Injection See Figure 1

DC Coupled Differential or Common Mode

Single-Ended Voltage Output, dB Level = 0 dBm, RL = 100 Terminals OUT and VFB Connected DC Measurement LO Input Switched ±1

RL = 100 Unity Gain
dBm Input Signal Level MHz IF and High Side Injection
ORDERING GUIDE

Temperature Range

Package Description
to +85°C to +85°C
20-Lead PLCC 20-Lead PLCC Evaluation Board

Package Option

P-20A P-20A

PIN CONFIGURATION 20-Lead PLCC

Pin No.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

PIN DESCRIPTION

Mnemonic

VP IFN AN GND VN RFP RFN VN VP LON LOP VP GND BIAS VN OUT VFB COM AP IFP

Positive Supply Input Mixer Current Output Amplifier Negative Input Ground Negative Supply Input RF Input RF Input Negative Supply Input Positive Supply Input Local Oscillator Input Local Oscillator Input Positive Supply Input Ground Bias Input Negative Supply Input Amplifier Output Amplifier Feedback Input Amplifier Output Common Amplifier Positive Input Mixer Current Output

CAUTION ESD electrostatic discharge sensitive device. Electrostatic charges as high as 4000V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD831 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

Performance Characteristics

SECOND ORDER INTERCEPT dBm

TPC Third Order Intercept vs. Frequency, IF Held Constant at MHz
60 10
100 FREQUENCY MHz
1000

TPC Second Order Intercept vs. Frequency

ISOLATION dB
1000

FREQUENCY MHz

TPC IF-to-RF Isolation vs. Frequency

ISOLATION dB
40 30
100 FREQUENCY MHz
1000

TPC LO-to-RF Isolation vs. Frequency

ISOLATION dB
2 x LO IF 50
3 x LO IF 40

LO 30
1000

FREQUENCY MHz

TPC LO-to-IF Isolation vs. Frequency

FREQUENCY dB
80 3 x RF IF
70 2 x RF IF
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Datasheet ID: AD831AP-REEL 517753