MAX2740_1 [MAXIM]
Evaluation Kit; 评估套件
| 型号： | MAX2740_1 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit |
| 文件： | 总8页 (文件大小：385K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1670; Rev 0; 7/00
MAX2740 Evaluation Kit
General Description
Features
ꢀ Differential Baseband Outputs
The MAX2740 evaluation kit (EV kit) simplifies testing of
the MAX2740 GPS receiver. This kit allows evaluation of
the device’s LNA, mixers, variable gain amplifier (VGA),
fixed gain amplifier, voltage-controlled oscillator (VCO),
and synthesizer.
ꢀ +2.7V to +3.3V Single-Supply Operation
ꢀ SMA Connectors on All Signal Ports
The EV kit provides 50Ω SMA connectors for all signal
inputs and outputs. A varactor-based tank circuit is pro-
vided for the on-chip VCO and is phase locked with the
on-chip phase-locked loop (PLL).
Ordering Information
PART
TEMP.RANGE
IC PACKAGE
MAX2740EVKIT
-40°C to +85°C
48 TQFP-EP*
*Exposed Paddle
Component List
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
10µF ± 10% tantalum capacitor
AVX TAJC106K016R
2.7pF ± 0.1pF ceramic capacitor
(0402)
C1
1
C40
1
Murata GRM36COG2R7B050A
C2, C10, C14,
C18, C20, C21,
C32, C33, C35,
C36, C37, C38,
C43
1000pF ± 1± 0% ceramic capacitors
(0402)
Murata GRM36X7R102K050A
3pF ± 0.1pF ceramic capacitor
(0402)
Murata GRM36COG030B050A
12
C42
C44
1
1
2pF ± 0.1pF ceramic capacitor
(0402)
Murata GRM36COG020B050A
12pF ± 5% ceramic capacitor
(0402)
Murata GRM36COG120J050A
C3
1
13
7
BBY 51-03W Siemens tuning
diode
0.015µF ± 10% ceramic capacitors
(0402)
Murata GRMX5R153K016A
D1
R2
1
1
C4, C8, C16,
C22−C31,
100Ω variable resistor
Bourns 3796W Digi-Key
C5, C7, C13,
C15, C17, C19,
C39
100pF ± 5% ceramic capacitors
(0402)
Murata GRM36COG101J050A
R3, R4
R5, R8
2
2
4
2
6
1
1
100Ω ± 5% resistors (0402)
12.1kΩ ± 1% resistors (0402)
2.74kΩ ± 1% resistors (0402)
1.21kΩ ± 1% resistors (0402)
2kΩ ± 1% resistors (0402)
453Ω ± 1% resistor (0402)
15kΩ ± 1% resistor (0402)
R6, R7, R9, R10
R11, R12
R13−R18
R19
7pF ± 0.1pF ceramic capacitor
(0402)
Murata GRM36COG070B050A
C6
1
6
C9, C12, C41,
C45, C46, C47
R20
Leave sites open
220nH inductors
Toko LL1608-FSR22J
L1, L2, L5
3
8.2nH inductors
Toko LL1608-FH8N2K
L8, L9
L3
2
1
1
2
Leave site open
1.8nH inductor
Murata LQP10A1N8B00
L10
L11, L12
0Ω resistors (0603)
________________________________________________________________ Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX2740 Evaluation Kit
Component List (continued)
Table 1. Recommended Test Equipment
EQUIPMENT
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
MAX2740ECM 48-pin TQFP-EP*
MAX4122EUK SOT23-5
U1
U2
1
1
One HP 8648C or equivalent
and one HP 83712A or equivalent.
These should be capable of
delivering -70dBm to 0dBm of
output power in the 10MHz to
2000MHz frequency range. The
HP 8648C is required to test the
receive signal path, and the HP
83712A is a low-phase noise
source for the reference frequency.
SMA connectors (PC mount)
Johnson 142-0701-201 or
Digi-Key J500-ND
RF Signal
Generators (2)
J3−J22
20
JU1−JU4, JU7,
7
2
2-pin headers
JU8, JU9
Test points
Digi-Key 5000K-ND
VCC, GND
Capable of providing at least
100mA at +2.7V to +3.3V
MAX2740 EV kit circuit board,
Rev. B
Power Supply
—
—
1
1
Spectrum Analyzer
Balun (2)
HP 8561E
MAX2740 data sheet
M/A Com Anzac 96341
*Note: U1 has an exposed paddle that requires it to be solder
attached to the circuit board to ensure proper functionality of
the part.
For external control of VGA
functions
Extra Voltage Source
Component Suppliers
2) Connect V
and GND. Set the supply voltage to
CC
+3.0V. When the power is turned on, the current
should be approximately 55mA.
SUPPLIER
AVX
PHONE
FAX
803-946-0690
847-639-6400
218-681-6674
408-501-6000
949-852-2001
708-297-0070
803-626-3123
847-639-1469
218-681-3380
408-501-2424
949-852-2002
708-699-1194
3) For evaluation of the LNA gain, first calibrate the
setup for cable losses. Connect the signal genera-
tor with 1575.42MHz at -30dBm to LNA_IN.
Connect LNA_OUT to the spectrum analyzer. The
measured power gain will be approximately 16dB.
Coilcraft
Digi-Key
Infineon
Murata
Toko
4) Repeat the calibration procedure (step 3) for use on
the RF mixer. Connect the 1575.42MHz (-30dBm)
signal source to the RFMIX_IN+. Connect
RFMIX_OUT+ and RFMIX_OUT- through the balun
to the spectrum analyzer. At 135MHz, losses due to
the Anzac balun are approximately 0.65dB. The
measured power gain should be approximately
22dB. If a balun is unavailable, a single-ended
measurement of the output can be taken. Terminate
the unused output in 50Ω, and add 3dB to the final
output power measurement.
Note: Please indicate that you are using the MAX2740 when
contacting these component suppliers.
Quick Start
The MAX2740 EV kit is fully assembled and factory test-
ed. Follow the instructions in the Connections and
Setup section. Table 1 lists the test equipment recom-
mended to verify MAX2740 operation. This list is intend-
ed as a guide only; substitutions may be possible.
Figure 1 shows the MAX2740 EV kit schematic.
5) Repeat the calibration procedure (step 3) for use
on the IF mixer. Use the baluns on the input and
output to allow a fully differential measurement.
Connect IFMIX_IN+ and IFMIX_IN- through one
balun to the 135.42MHz (-47dBm) signal source.
Connect IFMIX_OUT+ and IFMIX_OUT- through the
second balun to the spectrum analyzer. At 135MHz,
losses due to the Anzac balun are approximately
0.65dB, and at 15MHz, the losses are approximately
0.3dB. For gain calculation, the attenuation due to
Connections and Setup
The customer has the option of closing the PLL loop or
externally driving the LO. The PLL loop is closed on the
assembled EV kit. To externally drive the LO, remove
L10 and place C9. A 1440MHz, -10dBm signal is
required at the TANK SMA connector. Perform the fol-
lowing steps to evaluate the MAX2740:
1) Verify that jumpers JU1, JU2, and JU7, JU8, JU9
are in place.
2
_______________________________________________________________________________________
MAX2740 Evaluation Kit
the 2kΩ load resistor on each output must be taken
into account. The total differential gain calculation,
assuming two baluns, is:
7) The FGA procedure will be similar to the VGA,
minus the need for the second voltage source.
Repeat the calibration procedure as before (step
3). Connect FGA_IN+ and FGA_IN- through one
balun to the 15.42MHz (-43dBm) signal source.
Connect FGA_OUT+ and FGA_OUT- through the
second balun to the spectrum analyzer. At
15.42MHz, losses due to the Anzac balun are
approximately 0.3dB. Calculations are identical to
that of the VGA. The measured voltage gain should
be approximately 40dB.
P
= P
− P
IN
IN(MEAS) LOSS(BALUN AT 135MHz)
P
= P
+ P
LOSS(BALUN AT 15MHz)
OUT
OUT(MEAS)
+ P
LOSS(LOAD)
where:
Adjustments and Control
The MAX2740 EV kit is configured with a 100kΩ trim pot
for setting and adjusting the VGA gain. To use an exter-
nal supply, remove the 2-pin series and shunt jumpers
(JU3 and JU4). Connect the supply directly to the
nongrounded terminal of JU3.
100
4100
P
= 20log
= 32.3dB
LOSS(LOAD)
Power_Gain = P
−P
OUT
IN
The measured power gain should be approximately
36dB.
Detailed Description
The following sections cover the EV kit’s circuit blocks
in detail. (Refer to the MAX2740 data sheet for addition-
al information.)
6) To control the VGA gain, connect the second power
supply to the nongrounded terminal of jumper JU3,
and open jumper JU4. The VGA gain will be evalu-
ated at V
= 0.5V and 2.5V. It is important to note
GC
LNA
The LNA is a two-stage amplifier using feedback to set
the gain. The circuit requires input and output match-
ing. It is externally biased through the output matching
network.
that the VGA gain and subsequent FGA gain are
voltage-gain measurements. Repeat the calibration
procedure as before (step 3). Connect VGA_IN+
and VGA_IN- through one balun to the 15.42MHz
(-27dBm) signal source. Connect VGA_OUT+ and
VGA_OUT- through the second balun to the spec-
trum analyzer. At 15.42MHz, losses due to the
Anzac balun are approximately 0.3dB. For gain cal-
culation, the attenuation due to the 2kΩ load resis-
tor on each output must be taken into account. The
total differential gain calculation, assuming two
baluns, is:
RF MIXER
The RF mixer is a double-balanced Gilbert cell with
local LO drive provided from a low-impedance differen-
tial pair. The second RF input is brought out to a sepa-
rate pin for external decoupling on pin 7. The IF output
is delivered through low-output-impedance emitter fol-
lowers. The input is matched to 50Ω, and the outputs
are individually matched to 50Ω (100Ω differential).
The mixer is intended to drive a 400Ω SAW filter.
P
= P
− P
IN
IN(MEAS) LOSS(BALUN AT 15MHz)
P
= P
+ P
LOSS(BALUN AT 15MHz)
OUT
OUT(MEAS)
IF MIXER
The IF mixer is very similar to the RF mixer, except the
IF mixer input is fully differential. The emitter follower
outputs are intended to drive directly into a high-imped-
ance, differential, 3-pole lowpass filter made up of dis-
crete components.
+ P
LOSS(LOAD)
where:
P
100
4100
= 20log
= 32.3dB
LOSS(LOAD)
Voltage_Gain=P
−P − 6dB
OUT
IN
The measured voltage gain at V
= 2.5V should
GC
be approximately 15dB. The gain range should be
more than 50dB.
_______________________________________________________________________________________
3
MAX2740 Evaluation Kit
VGA and FGA
The inputs and outputs of both circuits are differential.
The VGA has a useful gain-control range of >50dB. The
FGA was designed to deliver 40dB of differential gain
at the second IF frequency of 15.42MHz. In the appli-
cation, the FGA differential inputs are received from the
VGA outputs through a balanced lowpass filter circuit.
The FGA’s differential output is designed to drive a dig-
itizer with a typical load impedance of 4kΩ differential.
PC Board Layout/Construction
The MAX2740 EV kit can serve as a board layout guide.
Keep PC board trace lengths as short as possible to
minimize parasitics. Keep decoupling capacitors close
to the device, with a low inductance via connection to
the ground plane. The GLSOUT signal must not be
routed parallel to the REF input to avoid loss of frequen-
cy lock due to coupling between the two signals.
The MAX2740 EV kit PC board uses 14mil-wide traces
for 50Ω traces. The PC board has an 8mil layer profile
to the ground plane on FR4, with a dielectric constant
of 4.5, and 75mil trace-to-ground-plane spacing.
4
_______________________________________________________________________________________
MAX2740 Evaluation Kit
+3VA
+3VA
JU9
JU8
IFMIX_OUT+
J18
SMA
RFMIX_OUT+
J20
J21
SMA
J17
J19
IFMIX_OUT-
RFMIX_OUT-
L1
SMA
+3VA_VCO
+3VA
SMA SMA
VCC
GND
C39
100pF
C35
1000pF
220nH
J1
J2
JU1
JU2
C10
1000pF
+
L2
220nH
C1
10µF
C46
C47
+3VA_AN
OPEN
OPEN
C2
C33
1000pF
1000pF
C4
0.015µF
C5
100pF
C32
1000pF
L12
0Ω
L11
0Ω
L8
8.2nH
C12
OPEN
C45
OPEN
C40
2.7pF
C41
OPEN
C37
1000pF
C38
1000pF
J22
SMA
R3
100Ω
R12
1.1k
R11
1.1k
LNA_OUT
+3VA
C42
3pF
L9
8.2nH
C43
1000pF
C31
0.015µF
R13
2k
1
36
J16
GND_2LNA
GND_2LNA
IFMIX_OUT+
IFMIX_OUT-
VGA_IN+
VGA_IN-
GND
IFMIX_OUT+
IFMIX_OUT-
VGA_IN+
SMA
C30
0.015µF
2
3
35
34
33
32
31
30
29
28
27
26
25
J15
SMA
C29
0.015µF
R14
2k
LNA_IN
J3
J14
SMA
LNA_IN
SMA
C6
7pF
L3
NO_LOAD
4
J13
SMA
GND_1LNA
GND_1LNA
GND_AMIX
FRMIX_IN-
AGCON
VGA_IN-
C28
0.015µF
5
C27
0.015µF
R15
2k
U1
6
J12
SMA
VGA_OUT+
VGA_OUT-
GND
VGA_OUT+
VGA_OUT-
+3VA
7
J11
SMA
MAX2740
C7
R16
2k
C26
0.015µF
100pF
JU4
8
R2
100k
C8
0.015µF
C25
0.015µF
+3V_AN
JU3
9
J10
SMA
VCC_ANA
GND_ANA
FGA_IN+
FGA_IN-
GND
FGA_IN+
FGA_IN-
10
11
12
J9
SMA
C24
0.015µF
GND
+3V_VCO
R17
2k
J8
SMA
VCC_VCO
FGA_OUT+
FGA_OUT+
C23
0.015µF
L10
1.8nH
R20
15k
C20
C21
C22
C13
100pF
D1
C44
2pF
C3
12pF
1000pF
1000pF
0.015µF
SIEMENS
C9
OPEN
C16
BBY 51-03W
0.015µF
J4
R19
453Ω
R18
2k
SMA
C17
100pF
TANK
J5
SMA
J6
SMA
J7
SMA
L5
220nH
+3VA
FGA_OUT_
REF_IN
GLS_OUT
JU7
R10
R9
2.74k
2.74k
C19
100pF
+3VA
5
R4
100Ω
R8
12.1k
3
4
+
U2
-
C18
1000pF
MAX4122
R5
12.1k
2
R6
2.74k
R7
2.74k
C15
100pF
C14
1000pF
Figure 1. MAX2740 EV Kit Schematic
_______________________________________________________________________________________
5
MAX2740 Evaluation Kit
1.0"
1.0"
Figure 2. MAX2740 EV Kit PC Board Layout—Component Side
Figure 3. MAX2740 EV Kit PC Board Layout—Ground Plane
1.0"
Figure 4. MAX2740 EV Kit PC Board Layout—Power Plane
_______________________________________________________________________________________
6
MAX2740 Evaluation Kit
NOTES
_______________________________________________________________________________________
7
MAX2740 Evaluation Kit
NOTES
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2000 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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