Analog Devices AD8342 User Manual

Active Receive Mixer

FEATURES

Broadband RF port: LF to 500 MHz Conversion gain: 3.7 dB Noise figure: 12.2 dB Input IP3: 22.7 dBm Input P LO drive: 0 dBm Differential high impedance RF input port Single-ended, 50 Ω LO input port Single-supply operation: 5 V @ 98 mA Power-down mode Exposed paddle LFCSP: 3 mm × 3 mm

APPLICATIONS

Cellular base station receivers ISM receivers Radio links RF instrumentation

: 8.3 dBm

1dB

LF to 500 MHz

AD8342

FUNCTIONAL BLOCK DIAGRAM

VPDC PWDN EXRB COMM

COMM

RFCM

RFIN

VPMX

VPLO LOCM LOIN COMM

AD8342

BIAS

Figure 1.

COMM

IFOP

IFOM

COMM

05352-001

GENERAL DESCRIPTION

The AD8342 is a high performance, broadband active mixer. It is well suited for demanding receive-channel applications that require wide bandwidth on all ports and very low intermodulation distortion and noise figure.

The AD8342 provides a typical conversion gain of 3.7 dB with an RF frequency of 238 MHz. The integrated LO driver presents a 50 Ω input impedance with a low LO drive level, helping to minimize the external component count.

The differential high impedance broadband RF port allows for easy interfacing to both active devices and passive filters. The RF input accepts input signals as large as 1.6 V p-p or 8 dBm (relative to 50 Ω) at P

1dB

The open-collector differential outputs provide excellent balance and can be used with a differential filter or IF amplifier, such as the AD8369 or AD8351. These outputs can also be converted to a single-ended signal through the use of a matching network or a transformer (balun). When centered on the VPOS supply voltage, the outputs may swing ±2 V differentially.

The AD8342 is fabricated on an Analog Devices proprietary, high performance SiGe IC process. The AD8342 is available in a 16-lead LFCSP. It operates over a −40°C to +85°C temperature range. An evaluation board is also available.

Rev. 0

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 Anal og Devices. Trademarks and registered trademarks are the property of their respective owners.

www.analog.com

AD8342

TABLE OF CONTENTS

Specifications..................................................................................... 3

AC Performance ............................................................................... 4

Spur Table .......................................................................................... 5

Absolute Maximum Ratings............................................................ 6

ESD Caution.................................................................................. 6

Pin Configuration and Function Descriptions............................. 7

Typical Performance Characteristics ............................................. 8

Circuit Description......................................................................... 14

REVISION HISTORY

4/05—Revision 0: Initial Version

AC Interfaces................................................................................... 15

IF Port.......................................................................................... 16

LO Considerations ..................................................................... 17

High IF Applications.................................................................. 18

Evaluation Board ............................................................................ 19

Outline Dimensions ....................................................................... 20

Ordering Guide .......................................................................... 20

Rev. 0 | Page 2 of 20

AD8342

SPECIFICATIONS

VS = 5 V, TA = 25°C, fRF = 238 MHz, fLO = 286 MHz, LO power = 0 dBm, ZO = 50 Ω, R nated into 100 Ω through a 2:1 ratio balun, unless otherwise noted.

Table 1.

Parameter Conditions Min Typ Max Unit

RF INPUT INTERFACE

Return Loss Hi-Z input terminated with 100 Ω off-chip resistor 10 dB Input Impedance

DC Bias Level Internally generated; port must be ac-coupled 2.4 V

OUTPUT INTERFACE

Output Impedance Differential impedance, frequency = 48 MHz 10||0.5 kΩ||pF DC Bias Voltage Supplied externally 4.75 VS 5.25 V Power Range Via a 2:1 impedance ratio transformer 13 dBm

LO INTERFACE

Return Loss 10 dB DC Bias Voltage Internally generated; port must be ac-coupled VS − 1.6 V

POWER-DOWN INTERFACE

PWDN Threshold 3.5 V PWDN Response Time Device enabled, IF output to 90% of its final level 0.4 µs Device disabled, supply current <5 mA 4 µs

PWDN Input Bias Current Device enabled −80 µA Device disabled +100 µA POWER SUPPLY

Positive Supply Voltage 4.75 5 5.25 V

Quiescent Current

VPDC Supply current for bias cells 5 mA VPMX, IFOP, IFOM Supply current for mixer, R

VPLO Supply current for LO limiting amplifier 35 mA Total Quiescent Current VS = 5 V 85 98 113 mA Power-Down Current Device disabled 500 µA

Frequency = 238 MHz (measured at RFIN with RFCM acgrounded)

= 1.82 kΩ 58 mA

BIAS

= 1.82 kΩ, RF termination = 100 Ω, IF termi-

BIAS

1||0.4 kΩ||pF

Rev. 0 | Page 3 of 20

AD8342

AC PERFORMANCE

VS = 5 V, TA = 25°C, LO power = 0 dBm, ZO = 50 Ω, R unless otherwise noted.

Table 2.

Parameter Conditions Min Typ Max Unit

RF FREQUENCY RANGE LO FREQUENCY RANGE IF FREQUENCY RANGE

50 500 MHz High side LO 60 850 MHz

10 350 MHz CONVERSION GAIN fRF = 460 MHz, fLO = 550 MHz, fIF = 90 MHz 3.2 dB f

= 238 MHz, fLO = 286 MHz, fIF = 48 MHz 3.7 dB

SSB NOISE FIGURE fRF = 460 MHz, fLO = 550 MHz, fIF = 90 MHz 12.5 dB f INPUT THIRD-ORDER INTERCEPT

INPUT SECOND-ORDER INTERCEPT

= 238 MHz, fLO = 286 MHz, fIF = 48 MHz 12.2 dB

= 460 MHz, f

RF1

= 90 MHz, f

IF1

= 238 MHz, f

RF1

= 48MHz, f

IF1

= 460 MHz, f

RF1

= 140 MHz

IF2

= 238 MHz, f

RF1

= 98 MHz

IF2

INPUT 1 dB COMPRESSION POINT fRF = 460 MHz, fLO = 550 MHz, fIF = 90 MHz 8.5 dBm f

= 238 MHz, fLO = 286 MHz, fIF = 48 MHz 8.3 dBm

LO TO IF OUTPUT LEAKAGE LO power = 0 dBm, fLO = 286 MHz −27 dBc LO TO RF INPUT LEAKAGE LO power = 0 dBm, fLO = 286 MHz −55 dBc 2× LO TO IF OUTPUT LEAKAGE

LO power = 0 dBm, f

IF terminated into 100 Ω and measured with a differential probe RF TO IF OUTPUT LEAKAGE RF power = −10 dBm, fRF = 238 MHz, fLO = 286 MHz −32 dBc IF/2 SPURIOUS RF power = −10 dBm, fRF = 238 MHz, fLO = 286 MHz −70 dBc

Frequency ranges are those that were extensively characterized; this device can operate over a wider range. See the H section for details. igh IF Applications

= 1.82 kΩ, RF termination 100 Ω, IF terminated into 100 Ω via a 2:1 ratio balun,

BIAS

= 461 MHz, fLO = 550 MHz,

RF2

= 89 MHz each RF tone −10 dBm

IF2

= 239 MHz, fLO = 286MHz,

RF2

= 47MHz each RF tone −10 dBm

IF2

= 410 MHz, fLO = 550 MHz, f

RF2

= 188 MHz, fLO = 286 MHz, f

RF2

= 238 MHz, fLO = 286 MHz

= 90 MHz,

IF1

= 48MHz,

IF1

22.2 dBm

22.7 dBm

50 dBm

44 dBm

−47

dBm

Rev. 0 | Page 4 of 20

AD8342

SPUR TABLE

VS = 5 V, TA = 25°C, RF and LO power = 0 dBm, fRF = 238MHz, fLO = 286MHz, ZO = 50 Ω, R IF terminated into 100 Ω via a 2:1 ratio balun.

Note: Measured using standard test board. Typical noise floor of measurement system = −100 dBm.

Table 3.

nfRF − mf

0 <−100 −25 −54 −28 −45 −35 −39 −36 −42 −57 −44 −42 −41 −46 −59 1 −39 3.5 −42 −6 −48 −16 −50 −28 −57 −37 −68 −45 −54 −37 −61 2 −52 −47 −51 −49 −54 −56 −56 −62 −62 −66 −71 −80 −80 −67 −79 3 −81 −57 −79 −61 −82 −61 −74 −69 −94 −85 −89 −86 −86 −90 −81 4 −78 −70 −80 −79 −80 −85 −87 −92 −93 −96 −95 <−100 −97 <−100 −95 5 −98 −79 −95 −87 −96 −94 −95 −88 −98 −94 <−100 <−100 <−100 <−100 <−100 6 <−100 <−100 <−100 −99 <−100 −96 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100

7 <−100 <−100 <−100 <−100 −96 <−100 −98 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 8 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 −97 <−100 <−100 <−100 <−100 <−100 <−100 9 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 −99 <−100 <−100 <−100 10 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 −99 <−100 <−100 <−100 <−100 11 <−100 <−100 <−100 <−100 <−100 <−100 <−100 −96 <−100 −97 <−100 −96 <−100 <−100 <−100 12 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 −99 <−100 −98 <−100 <−100 <−100 <−100 13 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 −97 <−100 −97 −99 <−100 <−100 14 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 −98 −98 <−100 <−100 <−100 15 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

= 1.82 kΩ, RF termination 100 Ω,

BIAS

Rev. 0 | Page 5 of 20

AD8342

ABSOLUTE MAXIMUM RATINGS

Table 4.

Parameter Rating

Supply Voltage, VS 5.5 V RF Input Level 12 dBm LO Input Level 12 dBm PWDN Pin VS + 0.5 V IFOP, IFOM Bias Voltage 5.5 V Minimum Resistor from EXRB to COMM 1.8 kΩ Internal Power Dissipation 650 mW θJA 77°C/W Maximum Junction Temperature 135°C Operating Temperature Range −40°C to +85°C Storage Temperature Range −65°C to +150°C

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product 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.

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Rev. 0 | Page 6 of 20

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