19-2686; Rev 1; 2/04
MAX2027 Evaluation Kit
General Description
The MAX2027 evaluation kit (EV kit) simplifies the evalu-
ation of the MAX2027 high-linearity, digitally controlled,
variable-gain amplifier. The kit is fully assembled and
tested at the factory. Standard 50Ω SMA connectors
are included for the input and output to allow quick and
easy evaluation on the test bench.
This EV kit provides a list of equipment required to eval-
uate the device, a straightforward test procedure to ver-
ify functionality, a circuit schematic, a bill of materials
(BOM), and artwork for each layer of the PC board.
Contact MaximDirect sales at 888-629-4642 to check
pricing and availability of these kits.
♦
Fully Assembled and Tested
♦
50MHz to 400MHz Frequency Range
♦
Variable Gain: -8dB to +15dB
♦
Output IP3: 35dBm (All Gain Settings)
♦
Noise Figure: 4.7dB at Maximum Gain
♦
Digitally Controlled Gain with 1dB Resolution and
±0.05dB State-to-State Accuracy
Features
Evaluates: MAX2027
Component Suppliers
SUPPLIER
Coilcraft
Johnson
Murata
PHONE
847-639-6400
507-833-8822
770-436-1300
WEBSITE
www.coilcraft.com
www.johnsoncomponents.com
www.murata.com
PART
MAX2027EVKIT
Ordering Information
TEMP RANGE
-40°C to +85°C
IC PACKAGE
20 TSSOP-EP*
*EP
= Exposed paddle.
Component List (Unmatched)
DESIGNATION
C1, C3, C4 (Note 1)
C2, C5
C6, C7
C8, C9
C10
J1, J2
J3
J4
L1
L2
L3
L4
R1
R2–R6
U1
QTY
3
2
2
0
1
2
1
0
1
1
1
0
1
5
1
DESCRIPTION
1000pF ±5%, 50V C0G ceramic capacitors (0603)
Murata GRM1885C1H102J
100pF ±5%, 50V C0G ceramic capacitors (0603)
Murata GRM1885C1H101J
0.1µF ±10%, 16V X7R ceramic capacitors (0603)
Murata GRM188R71C104K
Not installed
0.047µF ±10%, 25V X7R ceramic capacitor (0603)
Murata GRM188R71E473K
PC board edge-mount SMA RF connectors (flat-tab launch)
Johnson 142-0741-856
Header 5
×
2 (0.100 spacing for 0.062in thick board)
Molex 10-88-1101 or equivalent
Not installed
330nH ±5% wire-wound IND (0805)
Coilcraft 0805CS-331XJBC
680nH ±5% wire-wound IND (1008)
Coilcraft 1008CS-681XJBC
0Ω resistor (0603) (used as a jumper for unmatched board)
Not installed
825Ω ±1% resistor (0603)
47kΩ ±5% resistors (0603)
MAX2027EUP-T
Note 1:
If matching is not required, C3 is installed using one pad of L4 and one pad of C3.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX2027 Evaluation Kit
Evaluates: MAX2027
Table 1. Suggested Components for
Matching
FREQUENCY
(MHz)
300
400
COMPONENT
L3, L4
C8, C9
L3, L4
C8, C9
VALUE
11nH
6.8pF
8.7nH
5pF
SIZE
0603
0603
0603
0603
Table 2. Attenuation Setting vs. Gain-
Control Bits
ATTENUATION
(dB)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
B4
(16dB)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
B3*
(8dB)
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
X
X
X
X
X
X
X
X
B2
(4dB)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
B1
(2dB)
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
B0
(1dB)
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Quick Start
The MAX2027 EV kit is fully assembled and factory test-
ed. Follow the instructions in the
Connections and
Setup
section for proper device evaluation. Table 2 lists
the attenuation setting vs. gain-control bits.
Test Equipment Required
• DC supply capable of delivering 5.25V and 100mA of
continuous current
• HP 8648 (or equivalent) signal source
• HP 8561E (or equivalent) spectrum analyzer capable
of covering the MAX2027’s frequency range as well
as a few harmonics
• Two digital multimeters (DMMs) to monitor V
CC
and
I
CC
, if desired
• HP8753D (or equivalent) network analyzer to measure
return loss and gain
• Lowpass filters to attenuate harmonic output of signal
sources, if harmonic measurements are desired
Connections and Setup
This section provides a step-by-step guide to testing
the basic functionality of the EV kit. As a general pre-
caution to prevent damaging the outputs by driving
high-VSWR loads,
do not turn on DC power or RF
signal generators until all connections are made.
Gain Setting
Connect the header pins for B4–B0 to GND for maxi-
mum gain (15dB, typ). See Table 2 for other gain set-
ting configurations. To set a logic high on B4–B0, leave
the respective header pin unconnected as on-board
resistors pull up the logic to +5V. To control B4–B0
using external logic (voltage limits per data sheet),
ensure that +5V is applied to the chip. Failure to do so
can cause the on-chip ESD diodes to draw significant
current and may damage the part.
*Enabling
B4 disables B3.
Testing the Supply Current
1) Connect 50Ω terminations to RF_IN and RF_OUT.
2) With the DC supply disabled, set it to +5.0V (through
a low internal resistance ammeter, if desired) and
connect to the +5V and GND terminals on the EV kit.
If available, set the current limit to 100mA.
3) Enable the DC supply; the supply current should
read approximately 60mA.
2
_______________________________________________________________________________________
MAX2027 Evaluation Kit
Testing the Power Gain
1) Connect the RF signal generator to the RF_IN SMA
connector. Do not turn on the generator’s output. Set
the generator to an output frequency of 50MHz, and
set the generator power level to -10dBm.
2) Connect the spectrum analyzer to the RF_OUT SMA
connector. Set the spectrum analyzer to a center
frequency of 50MHz and a total span of 1MHz.
3) With the DC supply disabled, set it to +5.0V (through
a low internal-resistance ammeter if desired) and
connect to the +5V and GND terminals on the EV kit.
If available, set the current limit to 100mA.
4) Connect B4–B0 to GND for 0dB attenuation.
5) Enable the DC supply, and then activate the RF gener-
ator’s output. A 50MHz signal shown on the spectrum
analyzer display should indicate a magnitude of
approximately 5dBm. Be sure to account for external
cable losses.
6) (Optional) Gain can be determined with a network
analyzer. This has the advantage of displaying gain
over a swept frequency band, in addition to display-
ing input and output return loss. Refer to the network
analyzer manufacturer’s user manual for setup
details.
Evaluates: MAX2027
L4, C8, and C9, are included to allow modification for
higher frequency operation (see Table 1 for suggested
components for additional frequencies). C1, C3, and C4
are DC-blocking capacitors for the RF_IN, ATTN
OUT
, and
RF_OUT ports. To reduce the possibility of noise pickup,
C2, C5, C6, and C7 form the V
CC
decoupling network.
Note the location of each component.
Modifying the MAX2027 EV Kit
The EV kit can be configured for use at any frequency
between 50MHz and 400MHz. See Table 1 for the cor-
rect matching component values for the desired oper-
ating frequency.
Layout Considerations
The MAX2027 evaluation board can be a guide for your
board layout. Pay close attention to thermal design and
close placement of parts to the IC. The MAX2027 pack-
age exposed paddle (EP) conducts heat from the part
and provides a low-impedance electrical connection.
The EP must be attached to the PC board ground plane
with a low thermal and electrical impedance contact.
Ideally, this can be achieved by soldering the backside
package contact directly to a top metal ground plane
on the PC board. Alternatively, the EP can be connect-
ed to a ground plane using an array of plated vias
directly below the EP. The MAX2027 EV kit uses eight
evenly spaced, 0.016in-diameter, plated through holes
to connect EP to the lower ground planes.
Depending on the RF ground-plane spacing, large sur-
face-mount pads in the RF path may need the ground
plane relieved under them to reduce shunt capacitance.
Detailed Description
Figure 1 is the schematic for the EV kit as shipped. This
circuit is internally matched for operation up to 250MHz.
Component pads for external matching components, L3,
_______________________________________________________________________________________
3
MAX2027 Evaluation Kit
Evaluates: MAX2027
+5V
1
GND
20
J4
C7
C2
2
MAX2027
GND
19
RF_IN
J1
C1
L3
3
EXPOSED
PADDLE
ATTNOUT
18
L4*
C9*
C8*
4
+5V
GND
GND
17
C3
5
R6
R5
R4
R3
R2
6
B4
GND
GND
16
B4
AMPIN
15
L1
7
B3
B3
AMP
BIAS
I
BIAS
14
C10
R1
8
B2
B2
ATTENUATION
LOGIC CONTROL
I
SET
13
C4
9
B1
L2
10
B0
B3
B1
GND
B0
11
+5V
B1
12
RF_OUT
J2
C5
C6
*THESE COMPONENTS ARE LEFT UNINSTALLED FROM THE FACTORY.
SEE TABLE 1 FOR SUGGESTED MATCHING COMPONENTS AT
DIFFERENT OPERATION FREQUENCIES. RF_TEST ALLOWS FOR
INTERSTAGE MEASUREMENTS.
J3-9
J3-7
J3-5
J3-3
J3-1
J3
J3-10
J3-8
J3-6
J3-4
J3-2
B4
B2
B0
GND
+5V
TOP VIEW OF HEADER
Figure 1. MAX2027 EV Kit Schematic
4
_______________________________________________________________________________________
MAX2027 Evaluation Kit
Evaluates: MAX2027
POWER SUPPLY
3-OUT, HPIB
(AG E3631A)
BENCH
MULTIMETER HPIB
(HP 34401A)
+5V
B4
GND
RF SIGNAL GENERATOR
(HP 8648D)
U1
MAX2027
B3
B2
B1
CONTROL
INPUTS
RF_IN
RF_OUT
B0
RF SPECTRUM ANALYZER
(HP 856xE)
Figure 2. Test Setup Diagram
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