DC2391A - Demo Manual

DEMO MANUAL DC2391A
LTC5589
700MHz to 6000MHz LOW
POWER I/Q MODULATOR
ABSOLUTE MAX INPUT RATINGS
DESCRIPTION
Supply Voltage:...................................................... +3.8V
Common Mode Level of
BBPI, BBMI, BBPQ, and BBMQ:............................ +2V
LOL, LOC DC Voltage:..........................................±50mV
LOL, LOC Input Power:...................................... +20dBm
TEMP, SDO Current Sink........................................ 10mA
Voltage on Any Pin Not
to Exceed...................................–0.3V to (VCC +0.3V)
TJMAX.....................................................................150°C
Operating Temperature Range............... –40°C to 105°C
Storage Temperature Range.................. –65°C to 150°C
Demonstration circuit 2391A is optimized for evaluation
of the LTC®5589 low power I/Q modulator up to 4.5GHz.
For frequencies above 4.5GHz, LO matching circuit on
the DC2391A demo board can be easily modified for
improved image rejection performance. Refer to data
sheet for additional information. The four balanced I- and
Q-baseband input ports can be either AC-coupled with
internal bias supplied, or DC-coupled from a source with
a common-mode voltage level of about +1.4V. The SPI
interface is used to set internal registers which control
the gain, optimum center frequency, I-offset, Q-offset and
sideband suppression. In addition to the digital gain control
with 1dB steps, there is an analog gain control, VCTRL. An
on‑chip thermometer can be used to compensate for the
gain vs temperature variations using a digital gain control
change. The update can either be automatically triggered,
or entirely switched off.
CAUTION: This part is sensitive to electrostatic discharge
(ESD). Observe proper ESD precautions when handling
the LTC5589.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2391A
L, LT, LTC, LTM, Linear Technology , the Linear logo and Linduino are registered trademarks
and QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
TEST SETUP
IQ BASEBAND
GENERATOR
SPECTRUM
ANALYZER
OR VSA
LO SIGNAL
GENERATOR
IQ INPUTS
DVM
PC
Linduino® ONE
DC2026C
RF
LTC5589
ON
DC2391A
GND
SPI
USB SERIAL
CONTROLLER
USB
USB
LO
2560MHz, 0dBm NOM.
+3.3V EN
+
–
SPI
+
–
POWER SUPPLY
+3.3V
RIBBON CABLE
DC2391A F01
Figure 1: Test Setup for RF Performance Measurements
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1
DEMO MANUAL DC2391A
NOTES ON TEST EQUIPMENT AND SETUP
• Use a high performance baseband signal generator with differential outputs, such as the Rohde &
Schwarz SMJ100A vector signal generator or
equivalent.
• The LO harmonics can degrade image rejection
severely. Third harmonic should be kept at least 6dB
lower than the desired image rejection, or it should
be compensated by adjusting the quadrature phase
balance, register 0x05. In the extreme case of nearly
square wave LO drive, large offset values may be
required for registers 0x04 and 0x05.
•
Use narrow resolution bandwidth (RBW) and engage
video averaging on the spectrum analyzer to lower
the displayed average noise level (DANL). The tradeoff is increased sweep time.
• Spectrum analyzers can produce significant internal
distortion products if overdriven. Generally, spectrum
analyzers are designed to operate their best with
about –30 to –40dBm at their 1st mixer. Sufficient
spectrum analyzer input attenuation should be used
to avoid overdrive, but too much attenuation reduces
sensitivity and dynamic range.
•
Before taking measurements, the system performance
should be evaluated to ensure that: 1) clean baseband
signals can be produced, 2) the LO harmonics and
phase noise are minimized for CW LO drive, 3) the
spectrum analyzer’s internal distortion is minimized,
and noise floor is satisfactory.
QUICK START PROCEDURE
1. Remove the DC2391A from its protective packaging in
an ESD-safe working area (see Figure 1). Make sure
jumper JP1 is installed (VCTRL = VCC).
2. Set the baseband signal generator output DC commonmode voltage to +1.4VDC, set the amplitude (Vemf) = 1V
diff, but do not yet connect the 4 cables to the DC2391A.
3. Connect the DC power supply and increase voltage
to +3.3V. Using a voltmeter, verify the voltage at the
LTC5589 VCC pin or JP1 is +3.3V. Adjust if necessary.
4.Apply 3.3V to DC2391A’s enable input (EN).The enable
voltage must never exceed the LTC5589’s VCC supply
voltage by 0.3V or drop below –0.3V.
5. Verify the total VCC supply current is approximately
29mA.
6. Connect the RF output to the spectrum analyzer.
7. Connect the LO source to the LO input and apply a
2560MHz, 0dBm CW LO signal.
8. Configure the baseband signal source to provide a
single CW carrier with 100kHz offset. I- and Q-channels
should be in phase-quadrature and set for lower sideband selection.
2
9. Observe the modulator’s RF output on the spectrum
analyzer at 2559.9MHz. Also observe the sideband
suppression (aka Image Rejection) at 2560.1MHz,
and the LO Leakage at 2560MHz.
10. Up to this point, the I/Q Modulator has been at default
center frequency and gain, with no trims. To change
modulator center frequency, gain, etc., connect the
Linduino to the DC2391A with the ribbon cable provided. Make sure jumper JP3 on the DC2026C is set
to 3.3V.
11. Run QuikEval™ to start the GUI associated with the I/Q
modulator.
12. Be sure to update the QuikEval to get latest software
version that supports the LTC5589. LTC5589 GUI will
automatically be installed on the computer for the
first time when DC2391A is connected to Linduino
DC2026C.
13. The turn off procedure is the reverse of the turn on
procedure: Make sure VEN is removed before VCC.
dc2391af
DEMO MANUAL DC2391A
QuikEval SOFTWARE
Figure 2: QuikEval Screen
QuikEval Usage Notes
1.The LTC5589 QuikEval is a modified version of the
LTC5599 QuikEval program. The Windows Start Menu
for LTC5589 will say LTC5599 LTC5589. That’s OK.
The correct form will be automatically loaded.
6. In end applications, Linduino C code is available to
help user get from engineering units (MHz, dB gain,
mV, dB and degrees imbalance) to register values, and
vice versa.
2. The status box at the right shows activity, and should
show Connected. Begin by clicking “Reset”. Red font
notification occurs if anything wrong. If SPI connection
is lost, simply click “Connect” near top right corner.
7.The LTC5589 registers reset to default while starting
QuikEval GUI, which defaults CLOEN bit (bit 4, register
0x06) to 1. This allows for the automatic adjustment
of the LO match. For large phase adjustments, the I/Q
phase extension bits are changed from default, and it
is recommended to let GUI find the best C_LO values
(check box in GUI) in order to avoid phase discontinuities during I/Q phase extension bits changes. In that
case, the CLOEN bit is cleared and CLOO override bits
in register 0x06 are used to keep the LO match the
same while the polyphase filter center frequency is
adjusted in order to maintain a smooth phase adjustment during the I/Q phase extension bits changes. For
more information, refer to the LTC5589 data sheet.
3. When a new LO frequency is entered in the top left
corner of the form, followed by Enter key, the software
calculates a new register 0x00 value, shows it, loads
it, and reads back to verify.
4. Gain is easily modified here. DC current consumption
automatically scales with gain changes (lower RF
output power permits lower DC current).
5. If desired, I and Q DC offsets can be trimmed out, as
can SSB suppression, via the controls on left side of
form.
dc2391af
3
DEMO MANUAL DC2391A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
1
1
C1
CAP., X5R, 4.7µF, 10%, 16V, 0603
MURATA, GRM188R61C475KAAJD
2
2
C2, C14
CAP., C0G, 1000pF, 5%, 50V, 0402
MURATA, GRM1555C1H102JA01D
3
3
C3, C15, C16
CAP., X7R, 0.1µF, 10%, 16V, 0402
MURATA, GRM155R71C104KA88D
4
1
C4
CAP., C0G, 100pF, 5%, 25V, 0402
MURATA, GRM1555C1E101JA01D
5
1
C5
CAP, C0G, 2pF, ±0.05pF, 50V, 0402
MURATA, GJM1555C1H2R0WB01D
6
0
R2, C6, C7, R8, C8, R9, C9, R10,
R11, R12, R24, R25, R26, R27
OPT, OPT
7
4
C10, C11, C12, C13
CAP., COG, 2.2pF, ±0.1pF, 25V, 0402
MURATA, GRM1555C1E2R2BZ01D
8
2
C17, C18
CAP, C0G, 0.2pF, ±0.05pF, 50V, 0402
MURATA, GRM1555C1HR20WA01D
9
5
E1, E2, E3, E7, E9
TESTPOINT, TURRET, 0.094"
MILL-MAX, 2501-2-00-80-00-00-07-0
10
4
E4, E5, E6, E10
TESTPOINT, TURRET, 0.063"
MILL-MAX, 2308-2-00-80-00-00-07-0
11
1
FB1
FERRITE BEAD, 330Ω @100MHz
TDK, MPZ1608S331AT00
12
1
JP1
HEADER, 2-PIN 0.079 SINGLE ROW
SULLINS, NRPN021PAEN-RC
13
1
XJP5
SHUNT, 2mm CTRS.
SAMTEC, 2SN-BK-G
14
6
J1-J6
CONN., SMA, 50Ω, EDGE-LANCH
E. F. JOHNSON, 142-0701-851
15
0
J7, J8
CON., OPT
16
1
L1
IND.,4.7nH, 0402HP
COILCRAFT, 0402HP-4N7XJLU
17
1
P1
HEADER, 2X7PIN, 0.079CC
MOLEX, 87831-1420
18
1
R1
RES., CHIP, 1, 1%, 0402
VISHAY, CRCW04021R00FKED
19
6
R7, R16, R17, R18, R19, R22
RES., CHIP, 1k, 1%, 0402
VISHAY, CRCW04021K00FKED
20
3
R13, R14, R15
RES., CHIP, 4.99k, 1%, 0402
VISHAY, CRCW04024K99FKED
21
1
R20
RES., CHIP, 0Ω, 0402
VISHAY, CRCW04020000Z0ED
22
1
R21
RES., CHIP, 10Ω, 1%, 0402
VISHAY, CRCW040210R0FKED
23
1
R23
RES., CHIP, 200k, 1%, 0402
VISHAY, CRCW0402200KFKED
24
1
R28
RES., CHIP, 100k, 1%, 0402
VISHAY, CRCW0402100KFKED
25
1
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT 2391A
26
1
U1
IC., LOW POWER DIRECT QUADRATURE
MODULATOR, QFN-24-4X4
LINEAR TECH., LTC5589IUF#PBF
27
1
U2
IC, EEPROM 2-KBIT 400kHz 8TSSOP
MICROCHIP TECH., 24LC025-I/ST
28
2
STENCIL (TOP AND BOTTOM)
STENCIL DC2391A
29
1
CABLE ASSY., 8 STRIP
LINEAR RIBBON CABLE ;
4
dc2391af
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
A
B
C
E9
E7
J3
J4
E6
J8
J7
E3
E2
LO
R25
OPT
C18
0.2pF
TTCK
E5
R27 OPT
J1
VCTRL
R26 OPT
R24 OPT
C1
4.7uF
E4
C6
OPT
R8
OPT
R2
5
OPT
R28
100K
R19 1K
C5 2pF
C7
OPT
R9
OPT
1nF
TTCK
GND
LOC
LOL
GND
VCTRL
C14
1nF
6
5
4
3
2
1
C2
VCC
C3
100nF
L1 4.7nH
R1 1
JP1
1. ALL RESISTORS ARE IN OHMS, 0402
2. ALL CAPACITORS ARE 0402
NOTE: UNLESS
OTHERWISE SPECIFIED
GND
GND
BBPI
BBMI
TEMP
TEST
TEST
EN
GND
E1
1
2
D
25
FB1
330 Ohm @100 MHz
4
24
GND
23
VCC
TEMP
4
7
20
U1
LTC5589IUF
SD0
22
EN
BBPI
8
19
GNDRF
GNDRF
GNDRF
RF
GNDRF
GNDRF
CSB
21
BBMI
9
C4
1K
C9
OPT
R11
OPT
C17
0.2pF
R20
C15
100nF
R21 10
100pF
R12 OPT
C8
OPT
R10
OPT
13
14
15
16
17
18
R22
3
0
3
RF
BBPQ
BBMQ
C11
2.2pF
TP4
SCLK
4
3
2
1
TP5
CSB
C12
2.2pF
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
CUSTOMER NOTICE
J5
J6
C10
2.2pF
TP3
SDI
SDA
VSS
5
6
7
8
APPROVALS
SCL
A2
VCC
C16 0.1uF
U2
A1
WP
24LC025
A0
C13
2.2pF
R18 1K
2
SCALE = NONE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
AK
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG. ANDY M.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
J2
TP2
SDO
2
R14
4.99K
R7
TP6
SDA
1K
E10
14
12
11
9
10
5
7
4
6
2
1
GPIO1
EE_GND
EE_SCL
EE_SDA
EE_VCC
ISO_MISO
P1
ISO_SDA_MOSI
ISO_SCK_SCL
ISO_CSb
ISO_5V_3p3v_REG
ISO_7V_UNREG
HD-2X7.0.79
APPROVED DATE
ANDY M.
01-07-16
DATE:
SIZE
Thursday, January 07, 2016
1
OF 1
LOW POWER I/Q MODULATOR 0.7GHz - 3.8GHz
IC NO.
REV.
LTC5589IUF
N/A
3
DEMO CIRCUIT 2391A
SHEET 1
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
EE_GND
TP7
SCL
DESCRIPTION
3RD PROTO
TECHNOLOGY
R15
4.99K
R16 1K
R23
200K
ISO-3.3V
REV
3
TITLE: SCHEMATIC
R13
4.99K
R17 1K
__
ECO
1
REVISION HISTORY
ISO_GND
3
SDI
BBPQ
10
ISO_GND
8
SCLK
BBMQ
11
GND
12
ISO_GND
13
VCC
2.7V - 3.6V
5
A
B
C
D
DEMO MANUAL DC2391A
SCHEMATIC DIAGRAM
dc2391af
5
DEMO MANUAL DC2391A
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application
engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
6
dc2391af
Linear Technology Corporation
LT 0616 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2016
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