AD8348ARUZ Analog Devices Inc, AD8348ARUZ Datasheet

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AD8348ARUZ

Manufacturer Part Number
AD8348ARUZ
Description
IC QUADRATURE DEMOD 28-TSSOP
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD8348ARUZ

Function
Demodulator
Lo Frequency
100MHz ~ 2GHz
Rf Frequency
50MHz ~ 1GHz
P1db
-22dBm
Gain
25.5dB
Noise Figure
10.75dB
Current - Supply
58mA
Voltage - Supply
2.7 V ~ 5.5 V
Package / Case
28-TSSOP
Frequency Range
50MHz To 1GHz
Rf Type
Quadrature
Supply Voltage Range
2.7V To 5.5V
Rf Ic Case Style
TSSOP
No. Of Pins
28
Operating Temperature Range
-40°C To +85°C
Msl
MSL 1 - Unlimited
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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FEATURES
Integrated I/Q demodulator with IF VGA amplifier
Operating IF frequency 50 MHz to 1000 MHz
Demodulation bandwidth 75 MHz
Linear-in-decibel AGC range 44 dB
Third-order intercept
Quadrature demodulation accuracy
Noise figure 11 dB @ maximum gain (F
LO input −10 dBm
Single supply 2.7 V to 5.5 V
Power-down mode
Compact, 28-lead TSSOP package
APPLICATIONS
QAM/QPSK demodulator
W-CDMA/CDMA/GSM/NADC
Wireless local loop
LMDS
GENERAL DESCRIPTION
The AD8348 is a broadband quadrature demodulator with an
integrated intermediate frequency (IF), variable gain amplifier
(VGA), and integrated baseband amplifiers. It is suitable for use in
communications receivers, performing quadrature demodulation
from IF directly to baseband frequencies. The baseband amplifiers
are designed to interface directly with dual-channel ADCs, such
as the AD9201, AD9283, and AD9218, for digitizing and post-
processing.
The IF input signal is fed into two Gilbert cell mixers through
an X-AMP® VGA. The IF VGA provides 44 dB of gain control.
A precision gain control circuit sets a linear-in-decibel gain char-
acteristic for the VGA and provides temperature compensation.
The LO quadrature phase splitter employs a divide-by-2 frequency
divider to achieve high quadrature accuracy and amplitude balance
over the entire operating frequency range.
Optionally, the IF VGA can be disabled and bypassed. In this
mode, the IF signal is applied directly to the quadrature mixer
inputs via the MXIP and MXIN pins.
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 owners.
(3 dB IF BW of 500 MHz driven from R
IIP3 +28 dBm @ minimum gain (F
IIP3 −8 dBm @ maximum gain (F
Phase accuracy 0.5°
Amplitude balance 0.25 dB
IF
IF
= 380 MHz)
= 380 MHz)
IF
S
= 380 MHz)
= 200 Ω)
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
Separate I- and Q-channel baseband amplifiers follow the baseband
outputs of the mixers. The voltage applied to the VCMO pin sets
the dc common-mode voltage level at the baseband outputs.
Typically, VCMO is connected to the internal VREF voltage, but
it can also be connected to an external voltage. This flexibility
allows the user to maximize the input dynamic range to the ADC.
Connecting a bypass capacitor at each offset compensation input
(IOFS and QOFS) nulls dc offsets produced in the mixer. Offset
compensation can be overridden by applying an external voltage
at the offset compensation inputs.
The mixers’ outputs are brought off-chip for optional filtering
before final amplification. Inserting a channel selection filter
before each baseband amplifier increases the baseband amplifiers’
signal handling range by reducing the amplitude of high level,
out-of-channel interferers before the baseband signal is fed into
the I/Q baseband amplifiers. The single-ended mixer output is
amplified and converted to a differential signal for driving ADCs.
ENBL
VGIN
IFIN
IFIP
15
11
10
17
CONTROL
CELL
GAIN
BIAS
Quadrature Demodulator
FUNCTIONAL BLOCK DIAGRAM
VREF
14
MXIP
18
VREF
MXIN
19
50 MHz to 1000 MHz
ENVG
24
©2006 Analog Devices, Inc. All rights reserved.
Figure 1.
QXMO
IMXO
21
8
IOFS
QOFS
13
16
VCMO
SPLITTER
QAIN
IAIN
PHASE
DIVIDE
23
6
BY 2
AD8348
VCMO
www.analog.com
AD8348
QOPP
IOPP
25
4
QOPN
IOPN
26
3
28
5
1
VCMO
LOIP
LOIN

Related parts for AD8348ARUZ

AD8348ARUZ Summary of contents

Page 1

FEATURES Integrated I/Q demodulator with IF VGA amplifier Operating IF frequency 50 MHz to 1000 MHz ( 500 MHz driven from R Demodulation bandwidth 75 MHz Linear-in-decibel AGC range 44 dB Third-order intercept IIP3 +28 dBm ...

Page 2

AD8348 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configuration and Function Descriptions............................. 7 Equivalent Circuits ........................................................................... ...

Page 3

SPECIFICATIONS 380 MHz otherwise noted. Table 1. Parameter OPERATING CONDITIONS LO Frequency Range IF Frequency Range Baseband Bandwidth LO Input Level ...

Page 4

AD8348 Parameter IF FRONT END WITHOUT VGA Input Impedance Conversion voltage Gain 3 dB Output Bandwidth IF Gain Flatness Input 1 dB Compression Point (P1dB) Third-Order Input Intercept (IIP3) LO Leakage Demodulation Bandwidth Quadrature Phase Error I/Q Amplitude Imbalance Noise ...

Page 5

Parameter POWER-UP CONTROL ENBL Threshold Low ENBL Threshold High Input Bias Current Power-Up Time Power-Down Time POWER SUPPLIES Voltage Current (Enabled) Current (Standby) These parameters are guaranteed but not tested in production. Limits are ±6 Σ from the mean. 1 ...

Page 6

AD8348 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage on VPOS1, VPOS2, VPOS3 Pins LO Input Power IF Input Power Internal Power Dissipation θ JA Maximum Junction Temperature Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering, 60 sec) ESD ...

Page 7

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 3. Pin Function Descriptions—28-Lead TSSOP Pin No. Mnemonic Description 1, 28 LOIP, LOIN LO Inputs. For optimum performance, these inputs should be ac-coupled and driven differentially. Differential drive from single-ended sources can be achieved ...

Page 8

AD8348 Pin No. Mnemonic Description 15 ENBL Chip Enable Input. Active high. Threshold is equal VGIN Gain Control Input. The voltage on this pin controls the gain on the IF VGA. The gain control voltage range is ...

Page 9

EQUIVALENT CIRCUITS VPOS1 LOIN LOIP COM1 Figure 3. Circuit A COM3 Figure 4. Circuit B VPOS3 VCMO COM3 Figure 5. Circuit C VPOS3 IOPP, IOPN, QOPP, QOPN VCMO Rev Page VPOS3 IAIN, QAIN, VGIN, ENBL, ...

Page 10

AD8348 VPOS2 VREF COM2 Figure 9. Circuit G COM3 Figure 10. Circuit H VPOS3 IMXO, QMXO Rev Page VPOS3 MXIP MXIN COM3 Figure 11. Circuit I ...

Page 11

TYPICAL PERFORMANCE CHARACTERISTICS VGA AND DEMODULATOR 30 LINERR T = +85° 5V, FREQ = 380MHz POS 25 LINERR T = +25° 5V, FREQ = 380MHz POS 20 LINERR T = –40° 5V, FREQ = ...

Page 12

AD8348 27 5V, 0.2V, +25° 2.7V, 0.2V, +85°C 24 2.7V, 0.2V, +25°C 23 2.7V, 0.2V, –40°C 22 5V, 0.2V, +85° BASEBAND FREQUENCY (MHz) Figure 18. Gain ...

Page 13

BASEBAND FREQUENCY (MHz) Figure 24. IIP3 vs. F ...

Page 14

AD8348 DEMODULATOR USING MXIP AND MXIN 11.0 10.5 TEMP = –40°C, V POS 10.0 TEMP = –40°C, V 9.5 TEMP = +25° POS 9.0 TEMP = +25° 2.7V POS 8.5 TEMP = +85°C, V ...

Page 15

FINAL BASEBAND AMPLIFIERS 21 –40° +25°C, 2.7V 19 +25° +85° BASEBAND FREQUENCY (MHz) Figure 33. Gain vs VREF = ...

Page 16

AD8348 VGA/DEMODULATOR AND BASEBAND AMPLIFIER 2.0 1.5 1.0 2.7V, 0.2V, –40°C 0.5 0 2.7V, 0.2V, +85°C –0.5 5V, 0.2V, +25°C –1.0 –1.5 –2.0 100 200 300 400 500 600 IF FREQUENCY (MHz) Figure 37. Quadrature Phase Error vs ...

Page 17

CAPACITANCE) 240 220 200 180 160 (SHUNT RESISTANCE) 140 120 100 IF FREQUENCY (MHz) Figure 43. Input Impedance of Mixer Input vs 120 150 MX INPUTS WITH 4:1 BALUN 180 MXIP INPUT PIN ...

Page 18

AD8348 THEORY OF OPERATION VREF IMXO IOFS BIAS VREF ENBL 15 CELL IFIP 11 IFIN 10 GAIN VGIN 17 CONTROL VCMO MXIP MXIN ENVG QXMO QOFS Figure 48. Functional Block Diagram VGA ...

Page 19

VCMO. This forms a high-pass response for the baseband signal path with a lower 3 dB frequency π × Ω × PASS 2 2650 COFS Alternatively, the user can externally adjust the dc offset by driving ...

Page 20

AD8348 APPLICATIONS BASIC CONNECTIONS Figure 49 shows the basic connections schematic for the AD8348. J21 T21 ETC1-1- C21 C22 R21 1000pF 1000pF 60.4Ω AD8348 1 LOIP LOIN VPOS1 COM1 27 S C52 ...

Page 21

MXIN 19 MXIP 18 1000pF Figure 53. Driving the MX Inputs from a Differential Source If the MX inputs are to be driven from a single-ended 50 Ω source, a 4:1 balun can be used to transform the 200 ...

Page 22

AD8348 The level of the mixer output (or the output of the baseband filter) can then be set by varying the setpoint voltage fed to Pin 11 (VSET) of the AD8362. Care should be taken to ensure that blockers—unwanted signals ...

Page 23

LO GENERATION Analog Devices has a line of PLLs that can be used for generating the LO signal. Table 4 lists the PLLs and their maximum frequency and phase noise performance. Table 4. ADI PLL Selection Table Frequency F IN ...

Page 24

AD8348 differential impedance of 200 Ω (100 Ω per side). The differential inputs should then be fed into SMA connectors MXIP and MXIN. Mixer Outputs The I and Q mixer outputs are available through the IMXO and QMXO SMA connectors. ...

Page 25

Figure 61. Evaluation Board Top Layer Figure 62. Evaluation Board Top Silkscreen Rev Page AD8348 ...

Page 26

AD8348 Figure 63. Evaluation Board Bottom Layer Figure 64. Evaluation Board Bottom Silkscreen Rev Page ...

Page 27

Table 6. Evaluation Board Configuration Options Component Function V , GND Power supply and ground vector pins. S SW11, ENBL Device enable: Place SW11 in the ENBL position to connect the ENBL pin to V the DENBL position to disable ...

Page 28

... Temperature Range AD8348ARU −40°C to +85°C AD8348ARU-REEL7 −40°C to +85°C 1 AD8348ARUZ −40°C to +85°C AD8348ARUZ-REEL7 1 −40°C to +85°C AD8348-EVAL Pb-free part. ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. ...

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