MAX2055_1 [MAXIM]
Evaluation Kit; 评估套件
| 型号： | MAX2055_1 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit |
| 文件： | 总7页 (文件大小：270K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2888; Rev 0; 5/03
MAX2055 Evaluation Kit
General Description
Features
ꢀ Fully Assembled and Tested
The MAX2055 evaluation kit (EV kit) simplifies the evalu-
ation of the MAX2055 high-linearity, digitally controlled,
variable-gain analog-to-digital converter (ADC)
driver/amplifier (DVGA). The EV kit is fully assembled
and tested at the factory. Standard 50Ω SMA connec-
tors are included on the EV kit for the input and output
to allow quick and easy evaluation on the test bench.
ꢀ 30MHz to 300MHz Frequency Range
ꢀ -3dB to +20dB Variable Gain
ꢀ Output IP3: 40dBm (All Gain Settings at 70MHz)
ꢀ -76dBc 2nd Harmonic
This data sheet provides a list of equipment required to
evaluate the device, a straightforward test procedure to
verify functionality, a circuit schematic for the kit, a bill
of materials (BOM) for the kit, and artwork for each
layer of the PC board.
ꢀ -69dBc 3rd Harmonic
ꢀ Noise Figure: 5.8dB at Maximum Gain
ꢀ Digitally Controlled Gain with 1dB Resolution and
0.2dB Accuracy
ꢀ Adjustable Bias Currents
Component Suppliers
SUPPLIER
Coilcraft
Johnson
Murata
PHONE
WEBSITE
Ordering Information
847-639-6400 www.coilcraft.com
507-833-8822 www.johnsoncomponents.com
770-436-1300 www.murata.com
PART
TEMP RANGE
IC PACKAGE
MAX2055EVKIT
-40°C to +85°C
20 TSSOP-EP*
*EP = Exposed paddle.
TOKO
800-745-8656 www.tokoam.com
Note: When contacting these component suppliers, please
specify you are using the MAX2055.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
680nH 5%, wire-wound inductors
(1008)
Coilcraft 1008CS-681XJBC or
TOKO FSLM2520-R68J
1000pF 5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H102J
C1, C3–C6, C8,
9
L4, L5
2
C9, C10, C12
100pF 5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H101J
C2, C11
2
PC board edge-mount SMA RF
connectors
(flat-tab launch)
J1, J2
J3
2
1
C7
R1
1
1
5
1
Not used
Johnson 142-0741-856
1.13kΩ 1% resistor (0603)
47kΩ 5% resistors (0603)
10Ω 5% resistor (0603)
Header 5 x 2 (0.100 spacing for
0.062in thick board)
Molex 10-88-1101 or equivalent
R2–R6
R7
330nH 5%, wire-wound inductors
(0603)
Coilcraft 0603LS-331XJBC
J4, J5, J6
T1, T2
U1
0
2
1
Not installed
L1, L3
L2
2
1
MiniCircuit TC1-50-4 transformers
MAX2055EUP-T
100nH 5%, wire-wound inductor
(0603)
Coilcraft 0603LS-101XJBC
________________________________________________________________ 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.
MAX2055 Evaluation Kit
Quick Start
Table 1. Attenuation Setting vs. Gain-
Control Bits
The MAX2055 EV kit is fully assembled and factory test-
ed. Follow the instructions in the Connections and
Setup section for proper device evaluation. Table 1 lists
the attenuation setting vs. gain-control bit.
ATTENUATION
(dB)
B4
B3*
B2
(4dB)
B1
(2dB)
B0
(1dB)
(16dB) (8dB)
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
X
X
X
X
X
X
X
X
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Test Equipment Required
• DC supply capable of delivering 5.25V and 400mA
of continuous current
2
3
• HP 8648 (or equivalent) signal source
4
• HP 8561E (or equivalent) spectrum analyzer capa-
ble of covering the MAX2055’s frequency range, as
well as a few harmonics
5
6
7
• Two digital multimeters (DMMs) to monitor V
and
CC
I
, if desired
CC
8
• HP 8753D (or equivalent) network analyzer to mea-
9
sure return loss and gain
10
11
12
13
14
15
16
17
18
19
20
21
22
23
• 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 (20dB typ). See Table 1 for other gain-
setting 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 the 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 can damage the part.
*Enabling B4 disables B3 and the minimum attenuation is
16dB.
the generator to an output frequency of 70MHz, and
set the generator power level to -15dBm.
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 400mA.
2) Connect the spectrum analyzer to the RF_OUT SMA
connector. Set the spectrum analyzer to a center fre-
quency of 70MHz 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 400mA.
3) Enable the DC supply; the supply current should
read approximately 250mA.
4) Connect B4–B0 to GND for 0dB attenuation.
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
5) Enable the DC supply, and then activate the RF gen-
erator’s output. A 70MHz signal shown on the spec-
2
_______________________________________________________________________________________
MAX2055 Evaluation Kit
trum analyzer display should indicate a magnitude
of approximately 5dBm. Be sure to account for
external cable losses.
Modifying the EV Kit
The EV kit is easily configured for other topologies.
For a single-ended amplifier input:
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.
1) Remove T1 and place a low-inductance short circuit
between the T1 surface-mount pads that connect
capacitors C4 to C5.
2) Add a 1000pF 0603 case style capacitor for C7.
3) Change L2 to the same style and value inductor as
L1 (330nH) noted in the Component List.
Detailed Description
Figure 1 shows the schematic for the MAX2055 EV kit.
The EV kit is matched for operation up to 300MHz.
Capacitors C1, C4, C5, C8, and C9 are DC-blocking
4) Change R1 to 909Ω (to adjust the DC current to
compensate for the higher L2 resistance).
Note: In this configuration, C6 is not required.
capacitors for the RF_IN, ATTN
, and RF_OUT ports.
The EV kit also provides the ability for additional methods
of testing by adding in the option for an interstage RF
connection along with differential RF output connections.
OUT
To reduce the possibility of noise pickup, capacitors
C2, C3, C10, C11, and C12 form the V decoupling
CC
network. Inductors L1–L5 provide a method of biasing.
Inductor L2 needs to handle the total IC current and
have a DC resistance that is less than 0.2Ω. If the DC
resistance is higher than 0.2Ω, the value of R1 may
need to be adjusted down to maintain the nominal
operating current. Inductors L4 and L5 are nonmagnet-
ic coils that provide the output supply bias for the
amplifier. Transformer T1 is used to convert the single-
ended attenuator output to a differential signal. This
technique results in an improved 2nd harmonic perfor-
mance for the device. The amplifier can be driven single
ended if the improved 2nd harmonic is not required
(see Modifying the EV Kit section). Output transformer
T2 enables single-ended measurements, in addition to
providing common-mode rejection for the 2nd harmon-
ic. Resistor R7 helps reduce video leakage during
switching. Replace R7 with a 0Ω resistor if video leak-
age is not a concern.
Layout Considerations
The MAX2055 evaluation boards can be used as a guide
for your board layout. Give close attention to thermal
design and close placement of parts to the IC. The
MAX2055 package exposed paddle (EP) conducts heat
out of 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-imped-
ance contact. Ideally, this is provided by soldering the
backside package contact directly to a top metal ground
plane on the PC board. Alternatively, the EP can be con-
nected to a ground plane using an array of plated vias
directly below the EP. The MAX2055 EV kit uses eight
evenly spaced, 0.016in-diameter, plated through holes to
connect the EP to the lower ground planes.
Depending on the RF ground plane spacing, large sur-
face-mount pads in the RF path may need to have the
ground plane relieved under them to reduce shunt
capacitance.
_______________________________________________________________________________________
3
MAX2055 Evaluation Kit
5V
J4
1
20
U1
C3
C2
MAX2055
RF_IN
J1 C1
2
3
ATTN
19
18
OUT
5V
C4
C6
R2
R3
R4
R5
R6
R1
C5
I
T1
SET
4
5
6
7
8
B4
B3
B2
B1
B0
17
16
15
14
13
B4
1
ATTENUATION
LOGIC
CONTROL
AMPIN
B3
L2
B2
R7
L1
C
BP
B1
EXPOSED
PADDLE
C7
B0
L3
9
I
12
BIAS
5V
C12
J5
C11
10 RF_OUT-
RF_OUT+ 11
5V
J6
L4
L5
C10
C8
C9
1
+5V
GND
B0
B2
B4
T2
J3-2
J3-1
J3-4
J3-3
J3-6
J3-5
J3-8
J3-10
J3-9
RF_OUT
J2
J3-7
GND
B1
B3
Figure 1. MAX2055 EV Kit Schematic
4
_______________________________________________________________________________________
MAX2055 Evaluation Kit
POWER SUPPLY
3-OUT, HPIB
(AG E3631A)
BENCH
MULTIMETER HPIB
(HP 34401A)
+5V
GND
B4
B3
B2
B1
B0
RF SIGNAL GENERATOR
(HP 8648D)
CONTROL
INPUTS
MAX2055 EVKIT
RF_IN
RF_OUT
RF SPECTRUM ANALYZER
(HP 856xE)
Figure 2. Test Setup Diagram
1.0"
1.0"
Figure 3. MAX2055 EV Kit Component Placement Guide—
Component Side
Figure 4. MAX2055 EV Kit PC Board Layout—Top Silkscreen
_______________________________________________________________________________________
5
MAX2055 Evaluation Kit
1.0"
1.0"
Figure 5. MAX2055 EV Kit PC Board Layout—Bottom
Silkscreen
Figure 6. MAX2055 EV Kit PC Board Layout—Primary
Component Side
1.0"
1.0"
Figure 7. MAX2055 EV Kit PC Board Layout—GND Layer
(Layer 2)
Figure 8. MAX2055 EV Kit PC Board Layout—Route Layer
(Layer 3)
6
_______________________________________________________________________________________
MAX2055 Evaluation Kit
1.0"
1.0"
Figure 9. MAX2055 EV Kit PC Board Layout—Secondary Side
Figure 10. MAX2055 EV Kit PC Board Layout—Top Solder Mask
1.0"
Figure 11. MAX2055 EV Kit PC Board Layout—Bottom Solder
Mask
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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