300 MHz to 1000 MHz
Quadrature Modulator
ADL5370
FEATURES
Output frequency range: 300 MHz to 1000 MHz
Modulation bandwidth: >500 MHz (3 dB)
1 dB output compression: 11 dBm @ 450 MHz
Noise floor: −160 dBm/Hz
Sideband suppression: −41 dBc @ 450 MHz
Carrier feedthrough: −50 dBm @ 450 MHz
Single supply: 4.75 V to 5.25 V
24-lead LFCSP_VQ package
FUNCTIONAL BLOCK DIAGRAM
IBBP
IBBN
LOIP
LOIN
QUADRATURE
PHASE
SPLITTER
VOUT
QBBN
QBBP
06117-001
APPLICATIONS
Cellular communication systems at 450 MHz
CDMA2000/GSM
WiMAX/broadband wireless access systems
Cable communication equipment
Satellite modems
Figure 1.
GENERAL DESCRIPTION
The ADL5370 is the first in the fixed-gain quadrature modulator
(F-MOD) family designed for use from 300 MHz to 1000 MHz.
Its excellent phase accuracy and amplitude balance enable high
performance intermediate frequency or direct radio frequency
modulation for communication systems.
The ADL5370 provides a greater than 500 MHz, 3 dB baseband
bandwidth, making it ideally suited for use in broadband zero
IF or low IF-to-RF applications and in broadband digital
predistortion transmitters.
The ADL5370 accepts two differential baseband inputs and
a single-ended LO and generates a single-ended 50 Ω output.
The ADL5370 is fabricated using the Analog Devices, Inc.
advanced silicon-germanium bipolar process. It is available in
a 24-lead, exposed-paddle, Pb-free, LFCSP_VQ package. Perform-
ance is specified over a −40°C to +85°C temperature range.
A Pb-free evaluation board is 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 Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
ADL5370
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Theory of Operation ...................................................................... 10
Circuit Description..................................................................... 10
Basic Connections .......................................................................... 11
Optimization ............................................................................... 12
Applications Information .............................................................. 13
DAC Modulator Interfacing ..................................................... 13
Limiting the AC Swing .............................................................. 13
Filtering........................................................................................ 13
Using the AD9779 Auxiliary DAC for Carrier Feedthrough
Nulling ......................................................................................... 14
GSM Operation .......................................................................... 14
LO Generation Using PLLs ....................................................... 15
Evaluation Board ............................................................................ 16
Characterization Setup .................................................................. 17
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 19
REVISION HISTORY
10/06—Revision 0: Initial Version
Rev. 0 | Page 2 of 20
ADL5370
SPECIFICATIONS
V
S
= 5 V; T
A
= 25°C; LO = 0 dBm
1
single-ended; baseband I/Q amplitude = 1.4 V p-p differential sine waves in quadrature with a 500 mV
dc bias; baseband I/Q frequency (f
BB
) = 1 MHz, unless otherwise noted.
Table 1.
Parameter
ADL5370
Operating Frequency Range
Conditions
LO = 450 MHz
Range over which uncompensated sideband suppression < −30 dBc
Low frequency
High frequency
V
IQ
= 1.4 V p-p differential
Min
Typ
Max
Unit
Output Power
Output P1 dB
Carrier Feedthrough
Sideband Suppression
Quadrature Error
I/Q Amplitude Balance
Second Harmonic
Third Harmonic
Output IP2
Output IP3
Noise Floor
GSM
LO INPUTS
LO Drive Level
1
Input Return Loss
BASEBAND INPUTS
I and Q Input Bias Level
Input Bias Current
Input Offset Current
Differential Input Impedance
Bandwidth (0.1 dB)
Bandwidth (1 dB)
POWER SUPPLIES
Voltage
Supply Current
1
2
P
OUT
− (f
LO
+ (2 × f
BB
)), P
OUT
= 6.2 dBm
P
OUT
− (f
LO
+ (3 × f
BB
)), P
OUT
= 6.2 dBm
f1
BB
= 3.5 MHz, f2
BB
= 4.5 MHz, P
OUT
= −2 dBm per tone
f1
BB
= 3.5 MHz, f2
BB
= 4.5 MHz, P
OUT
= −2 dBm per tone
I/Q inputs = 0 V differential with a 500 mV common-mode bias,
20 MHz carrier offset
6 MHz carrier offset, P
OUT
= 6 dBm, P
LO
= 6 dBm
Characterization performed at typical level
See
Figure 9
for a plot of return loss vs. frequency
Pin IBBP, Pin IBBN, Pin QBBP, Pin QBBN
Current sourcing from each baseband input with a bias of 500 mV dc
2
300
1000
6.2
11
−50
−41
0.76
0.03
−65
−54
60
24
−160
−157
−7
0
6
500
45
0.1
2900
70
350
4.75
205
5.25
+7
MHz
MHz
dBm
dBm
dBm
dBc
Degrees
dB
dBc
dBc
dBm
dBm
dBm/Hz
dBc/Hz
dBm
dB
mV
μA
μA
kΩ
MHz
MHz
V
mA
LO = 450 MHz, baseband input = 700 mV p-p sine wave on 500 mV dc
LO = 450 MHz, baseband input = 700 mV p-p sine wave on 500 mV dc
Pin VPS1 and Pin VPS2
High LO drive reduces noise at a 6 MHz carrier offset in GSM applications.
See V-to-I converter discussion in the Circuit Description section for architecture information.
Rev. 0 | Page 3 of 20
ADL5370
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage VPOS
IBBP, IBBN, QBBP, QBBN
LOIP and LOIN
Internal Power Dissipation
θ
JA
(Exposed Paddle Soldered Down)
Maximum Junction Temperature
Operating Temperature Range
Storage Temperature Range
Rating
5.5 V
0 V to 2 V
13 dBm
1375 mW
54°C/W
159°C
−40°C to +85°C
−65°C to +150°C
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.
ESD CAUTION
Rev. 0 | Page 4 of 20
ADL5370
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
24
23
22
21
20
19
COM1
COM1
VPS1
VPS1
VPS1
VPS1
QBBP
QBBN
COM4
COM4
IBBN
IBBP
1
2
3
4
5
6
ADL5370
TOP VIEW
(Not to Scale)
18
17
16
15
14
13
VPS5
VPS4
VPS3
VPS2
VPS2
VOUT
COM2 7
LOIP 8
LOIN 9
COM2 10
COM3 11
COM3 12
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
1, 2, 7, 10 to 12,
21, 22
3 to 6, 14 to 18
Mnemonic
COM1, COM2,
COM3, COM4
VPS1, VPS2, VPS3,
VPS4, VPS5
IBBP, IBBN, QBBN,
QBBP
Description
Input Common Pins. Connect to ground plane via a low impedance path.
Positive Supply Voltage Pins. All pins should be connected to the same supply (V
S
). To ensure
adequate external bypassing, connect 0.1 μF capacitors between each pin and ground. Adjacent
power supply pins of the same name can share one capacitor (see Figure 25).
Differential In-Phase and Quadrature Baseband Inputs. These high impedance inputs must be
dc-biased to 500 mV dc, and must be driven from a low impedance source. Nominal characterized
ac signal swing is 700 mV p-p on each pin. This results in a differential drive of 1.4 V p-p with a
500 mV dc bias. These inputs are not self-biased and must be externally biased.
50 Ω Single-Ended Local Oscillator Input. Internally dc-biased. Pins must be ac-coupled. AC-couple
LOIN to ground and drive LO through LOIP.
Device Output. Single-ended, 50 Ω internally biased RF output. Pin must be ac-coupled to the load.
Connect to ground plane via a low impedance path.
19, 20, 23, 24
8, 9
13
LOIP, LOIN
VOUT
Exposed Paddle
Rev. 0 | Page 5 of 20
06117-002
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