AD8346ARUZ Analog Devices Inc, AD8346ARUZ Datasheet

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AD8346ARUZ

Manufacturer Part Number
AD8346ARUZ
Description
IC QUADRATURE MOD .8GHZ 16-TSSOP
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD8346ARUZ

Function
Modulator
Lo Frequency
800MHz ~ 2.5GHz
Rf Frequency
800MHz ~ 2.5GHz
P1db
-3dBm
Noise Floor
-147dBm/Hz
Output Power
-6dBm
Current - Supply
55mA
Voltage - Supply
2.7 V ~ 5.5 V
Test Frequency
1.9GHz
Package / Case
16-TSSOP
Frequency Range
0.8GHz To 2.5GHz
Rf Type
Quadrature
Supply Voltage Range
2.7V To 5.5V
Rf Ic Case Style
TSSOP
No. Of Pins
16
Operating Temperature Range
-40°C To +85°C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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FEATURES
High accuracy
Broad frequency range: 0.8 GHz to 2.5 GHz
Sideband suppression: −46 dBc @ 0.8 GHz
Sideband suppression: −36 dBc @ 1.9 GHz
Modulation bandwidth: dc to 70 MHz
0 dBm output compression level @ 0.8 GHz
Noise floor: −147 dBm/Hz
Single 2.7 V to 5.5 V supply
Quiescent operating current: 45 mA
Standby current: 1 μA
16-lead TSSOP
APPLICATIONS
Digital and spread spectrum communication systems
Cellular/PCS/ISM transceivers
Wireless LAN/wireless local loop
QPSK/GMSK/QAM modulators
Single-sideband (SSB) modulators
Frequency synthesizers
Image reject mixer
GENERAL DESCRIPTION
The AD8346 is a silicon RFIC I/Q modulator for use from
0.8 GHz to 2.5 GHz. Its excellent phase accuracy and amplitude
balance allow high performance direct modulation to RF.
The differential LO input is applied to a polyphase network
phase splitter that provides accurate phase quadrature from
0.8 GHz to 2.5 GHz. Buffer amplifiers are inserted between
two sections of the phase splitter to improve the signal-to-
noise ratio. The I and Q outputs of the phase splitter drive the
LO inputs of two Gilbert-cell mixers. Two differential V-to-I
converters connected to the baseband inputs provide the
baseband modulation signals for the mixers. The outputs of
the two mixers are summed together at an amplifier which is
designed to drive a 50 Ω load.
Rev. A
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 companies.
1 degree rms quadrature error @ 1.9 GHz
0.2 dB I/Q amplitude balance @ 1.9 GHz
This quadrature modulator can be used as the transmit mod-
ulator in digital systems such as PCS, DCS, GSM, CDMA, and
ISM transceivers. The baseband quadrature inputs are directly
modulated by the LO signal to produce various QPSK and
QAM formats at the RF output.
Additionally, this quadrature modulator can be used with direct
digital synthesizers in hybrid phase-locked loops to generate
signals over a wide frequency range with millihertz resolution.
The AD8346 comes in a 16-lead TSSOP package, measuring
6.5 mm × 5.1 mm × 1.1 mm. It is specified to operate over a
−40°C to +85°C temperature range and a 2.7 V to 5.5 V supply
voltage range. The device is fabricated on Analog Devices’ high
performance 25 GHz bipolar silicon process.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
COM1
COM1
ENBL
VPS1
IBBN
IBBP
LOIN
LOIP
FUNCTIONAL BLOCK DIAGRAM
1
2
3
4
5
6
7
8
Quadrature Modulator
© 2005 Analog Devices, Inc. All rights reserved.
SPLITTER
PHASE
BIAS
0.8 GHz to 2.5 GHz
Figure 1.
AD8346
16
15
14
13
12
11
10
www.analog.com
9
AD8346
QBBP
QBBN
COM4
COM4
VPS2
VOUT
COM3
COM2

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AD8346ARUZ Summary of contents

Page 1

FEATURES High accuracy 1 degree rms quadrature error @ 1.9 GHz 0.2 dB I/Q amplitude balance @ 1.9 GHz Broad frequency range: 0.8 GHz to 2.5 GHz Sideband suppression: −46 dBc @ 0.8 GHz Sideband suppression: −36 dBc @ 1.9 ...

Page 2

AD8346 TABLE OF CONTENTS Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Equivalent Circuits ........................................................................... 6 Typical Performance Characteristics ............................................. 7 Circuit Description......................................................................... 10 Overview...................................................................................... 10 LO Interface................................................................................. 10 V-to-I Converter......................................................................... 10 Mixers ...

Page 3

SPECIFICATIONS 25°C; LO frequency = 1900 MHz; LO level = –10 dBm; BB frequency = 100 kHz; BB inputs are dc-biased to 1 input S A level = 1.0 V p-p each ...

Page 4

AD8346 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage VPS1, VPS2 Input Power LOIP, LOIN (relative to 50 Ω) Min Input Voltage IBBP, IBBN, QBBP, QBBN Max Input Voltage IBBP, IBBN, QBBP, QBBN Internal Power Dissipation θJA Operating Temperature Range ...

Page 5

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 3. Pin Function Descriptions Pin No. Mnemonic Description 1 IBBP I Channel Baseband Positive Input Pin. Input should be dc-biased to approximately 1.2 V. Nominal characterized ac swing p-p (0.7 V ...

Page 6

AD8346 EQUIVALENT CIRCUITS VPS2 BUFFER 9kΩ INPUT 3kΩ ACTIVE LOADS Figure 3. Circuit A VPS1 LOIN LOIP Figure 4. Circuit B TO MIXER CORE PHASE SPLITTER CONTINUES Rev Page VPS1 75kΩ TO BIAS FOR 75kΩ ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS – 25°C – 5.5V P –8 V –9 –10 – 2.7V P –12 –13 –14 –15 800 1000 1200 1400 1600 1800 LO FREQUENCY (MHz) Figure 7. Single Sideband (SSB) Output ...

Page 8

AD8346 –7 – 5.5V P –9 – –11 P – 2.7V P –13 –14 –15 –40 –30 –20 – TEMPERATURE (°C) Figure 13. SSB P vs. Temperature ...

Page 9

–38 –40 –42 –44 –40 –30 –20 – TEMPERATURE (°C) Figure 19. Sideband Suppression vs. Temperature 1900 MHz, I and Q ...

Page 10

AD8346 CIRCUIT DESCRIPTION OVERVIEW The AD8346 can be divided into the following sections: local oscillator (LO) interface, mixer, voltage-to-current (V-to-I) converter, differential-to-single-ended (D-to-S) converter, and bias. A detailed block diagram of the part is shown in Figure 25. The LO ...

Page 11

BASIC CONNECTIONS The basic connections for operating the AD8346 are shown in Figure 27. A single power supply of between 2.7 V and 5 applied to pins VPS1 and VPS2. A pair of ESD protection diodes are connected ...

Page 12

AD8346 INTERFACE TO AD9761 T DAC® X Figure 28 shows a dc-coupled current output DAC interface. The use of dual-integrated DACs, such as the AD9761 with specified ±0.02 dB and ±0.004 dB gain and offset matching characteristics, ensures minimum error ...

Page 13

AC-COUPLED INTERFACE An ac-coupled interface can also be implemented, as shown in Figure 29. This is an advantage because there is almost no voltage loss due to the biasing network, allowing the AD8346 inputs to be driven by the full ...

Page 14

AD8346 EVALUATION BOARD The schematic of the AD8346 evaluation board is shown in Figure 30. This is a 4-layer FR4 board; the two center layers are used as ground planes and the top and bottom layers are used for signal ...

Page 15

Figure 31. Layout of Evaluation Board Figure 32. Silkscreen of Evaluation Board Rev Page AD8346 ...

Page 16

AD8346 CHARACTERIZATION SETUPS SSB SETUP Two main setups were used to characterize this product. These setups are shown in Figure 33 and Figure 35. Figure 33 shows the setup used to evaluate the product as an SSB. The AD8346 motherboard ...

Page 17

CDMA SETUP For evaluating the AD8346 with CDMA waveforms, the setup shown in Figure 35 was used. This is essentially the same setup as that used for the single sideband characterization, except that the AFG2020 was replaced with the AWG2021 ...

Page 18

... ORDERING GUIDE Model Temperature Range AD8346ARU −40°C to +85°C AD8346ARU-REEL −40°C to +85°C AD8346ARU-REEL7 −40°C to +85°C 1 AD8346ARUZ-REEL −40°C to +85°C 1 AD8346ARUZ-REEL7 −40°C to +85°C AD8346-EVAL Pb-free part. 5.10 5.00 4. 4.50 6.40 4.40 BSC 4.30 ...

Page 19

NOTES Rev Page AD8346 ...

Page 20

AD8346 NOTES ©2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective companies. C05335–0–6/05(A) Rev Page ...

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