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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
: 8.3 dBm
1dB
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 P
.
1dB
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 Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
Active Receive Mixer
FUNCTIONAL BLOCK DIAGRAM
VPDC PWDN
COMM
13
RFCM
14
AD8342
RFIN
15
VPMX
16
VPLO
LOCM
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
© 2005 Analog Devices, Inc. All rights reserved.
LF to 500 MHz
AD8342
EXRB COMM
8
COMM
BIAS
7
IFOP
6
IFOM
5
COMM
LOIN
COMM
Figure 1.
www.analog.com
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Summary of Contents for Analog Devices AD8342
- Page 1 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.
-
Page 2: Table Of Contents
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... -
Page 3: Specifications
= 1.82 kΩ BIAS Rev. 0 | Page 3 of 20 = 1.82 kΩ, RF termination = 100 Ω, IF termi- BIAS 1||0.4 10||0.5 4.75 5.25 − 1.6 −80 +100 4.75 5.25 AD8342 Unit kΩ||pF kΩ||pF µs µs µA µA µA... -
Page 4: Ac Performance
AD8342 AC PERFORMANCE = 5 V, T = 25°C, LO power = 0 dBm, Z unless otherwise noted. Table 2. Parameter Conditions RF FREQUENCY RANGE LO FREQUENCY RANGE High side LO IF FREQUENCY RANGE CONVERSION GAIN SSB NOISE FIGURE INPUT THIRD-ORDER INTERCEPT... -
Page 5: Spur Table
−99 <−100 −98 <−100 <−100 <−100 −97 <−100 −97 −99 <−100 <−100 −98 −98 <−100 <−100 <−100 <−100 <−100 <−100 AD8342 −46 −59 −37 −61 −67 −79 −90 −81 <−100 −95 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100... -
Page 6: Absolute Maximum Ratings
AD8342 ABSOLUTE MAXIMUM RATINGS Table 4. Parameter Supply Voltage, V RF Input Level LO Input Level PWDN Pin IFOP, IFOM Bias Voltage Minimum Resistor from EXRB to COMM Internal Power Dissipation θ Maximum Junction Temperature Operating Temperature Range Storage Temperature Range ESD CAUTION ESD (electrostatic discharge) sensitive device. -
Page 7: Pin Configuration And Function Descriptions
VPMX Positive Supply Voltage for the Mixer: 4.75 V to 5.25 V. PIN 1 VPLO INDICATOR 12 VPDC LOCM 11 PWDN AD8342 LOIN 10 EXRB TOP VIEW (Not to Scale) COMM 9 COMM Figure 2. 16-Lead LFCSP for disable mode. -
Page 8: Typical Performance Characteristics
AD8342 TYPICAL PERFORMANCE CHARACTERISTICS = 5 V, T = 25°C, RF power = −10 dBm, LO power = 0 dBm, Z 100 Ω via a 2:1 ratio balun, unless otherwise noted. IF = 48MHz IF = 140MHz IF = 10MHz... - Page 9 5.10 5.15 VPOS (V) = 238 MHz, f = 239 MHz LO Frequency = 286 MHz INPUT IP3 21.0 21.4 21.8 22.2 22.6 23.0 23.4 23.8 INPUT IP3 (238MHz) = 238 MHz, f = 286 MHz AD8342 5.20 5.25 24.2...
- Page 10 AD8342 10MHz 90MHz 48MHz 140MHz RF FREQUENCY (MHz) Figure 15. Input P1dB vs. RF Frequency 10.0 IF = 10MHz IF = 90MHz IF = 140MHz IF = 48MHz –15 –13 –11 –9 –7 –5 –3 LO LEVEL (dBm) Figure 16. Input P1dB vs. LO Level, f –40...
- Page 11 4.95 5.05 5.15 VPOS (V) Figure 25. Input IP2 vs. Vpos, f = 238 MHz, = 188 MHz, f = 286 MHz RF = 460MHz RF = 238MHz IF FREQUENCY (MHz) Figure 26. Noise Figure vs. IF Frequency AD8342 5.25...
- Page 12 AD8342 NF = 140MHz NF = 90MHz NF = 10MHz NF = 48MHz –15 –13 –11 –9 –7 –5 –3 LO POWER (dBm) Figure 27. Noise Figure vs. LO Power, f (kΩ) BIAS Figure 28. Gain vs. R , RF Frequency = 238 MHz, LO Frequency = 286MHz BIAS (kΩ)
- Page 13 Figure 36. Supply Current vs. Temperature LO FREQUENCY (MHz) Figure 37. LO Return Loss vs. LO Frequency 100pF 1.82kΩ 100pF VPDC PWDN EXRB COMM COMM COMM RFCM IFOP AD8342 100Ω RFIN IFOM VPMX COMM VPLO LOCM LOIN COMM 100pF LO IN AD8342 IF OUT (50Ω)
-
Page 14: Circuit Description
The device also features a power-down function. Application of a logic low at the PWDN pin allows normal operation. A high logic level at the PWDN pin shuts down the AD8342. Power consumption when the part is disabled is less than 10 mW. -
Page 15: Ac Interfaces
The RF input of the AD8342 is high impedance, 1 kΩ across the frequency range shown in Figure 41. The input capacitance decreases with frequency due to package parasitics. -
Page 16: If Port
PCB traces. One approach is to use an impedance transforming network or transformer located close to the AD8342. If very wideband out- put is desired, a nearby buffer amplifier may be a better choice, especially if IF response to dc is required. -
Page 17: Lo Considerations
Figure 48. Biasing the IF Port Open-Collector Outputs Using Pull-Up Choke Inductors The AD8342 is optimized for driving a 100 Ω load. Although the device is capable of driving a wide variety of loads, to main- tain optimum distortion and noise performance, it is advised that the presented load at the IF outputs is close to 100 Ω. -
Page 18: High If Applications
AD8342 HIGH IF APPLICATIONS In some applications it may be desirable to use the AD8342 as an up-converting mixer. The AD8342 is a broadband mixer capable of both up and down conversion. Unlike other mixers that rely on on-chip reactive circuitry to optimize performance... -
Page 19: Evaluation Board
EVALUATION BOARD An evaluation board is available for the AD8342. The evaluation board is configured for single-ended signaling at the IF output port via a balun transformer. The schematic for the evaluation board is presented in Figure 53. PWDN PWDN... -
Page 20: Outline Dimensions
AD8342ACPZ-R2 −40°C to +85°C AD8342ACPZ-WP −40°C to +85°C AD8342-EVAL Z = Pb-free part. © 2005 Analog Devices, Inc. All rights reserved. Trademarks and regis- tered trademarks are the property of their respective owners. 3.00 0.60 MAX BSC SQ 0.45 2.75...
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