Analog Devices AD8342 specifications Features, Applications, General Description

FEATURES

Broadband RF port: LF to 500 MHz

Conversion gain: 3.7 dB

Noise figure: 12.2 dB

Input IP3: 22.7 dBm

Input P1dB: 8.3 dBm

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

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 inter- modulation 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 P1dB.

Rev. 0

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Active Receive Mixer

LF to 500 MHz

AD8342

FUNCTIONAL BLOCK DIAGRAM

	VPDC		PWDN	EXRB	COMM
	12		11	10	9
COMM	13		BIAS		8	COMM
RFCM	14	AD8342			7	IFOP
RFIN	15				6	IFOM
VPMX	16				5	COMM
		1	2	3	4	05352-001
	VPLO		LOCM	LOIN	COMM

Figure 1.

The open-collector differential outputs provide excellent bal- ance and can be used with a differential filter or IF amplifier, such as the AD8369 or AD8351. These outputs can also be con- verted 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.

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