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19-1234; Rev 2; 2/99
MAX2420/MAX2421/MAX2422 MAX2460/MAX2463 Evaluation Kits
________________General Description
The MAX2420/MAX2421/MAX2422/MAX2460/MAX2463 evaluation kits (EV kits) simplify evaluation of the MAX2420/MAX2421/MAX2422/MAX2460/MAX2463 900MHz image-reject transceivers. The EV kits provide 50 SMA connectors for all RF inputs and outputs. A varactor-based tank circuit is provided for the on-chip voltage-controlled oscillator (VCO) and can be tuned by a potentiometer or external voltage. The VCO can be overdriven by an external source, if desired. (See EXT LO Input under the Adjustments and Control section). Switches are provided to control power-management features.
PART MAX2420EVKIT-SO MAX2421EVKIT-SO MAX2422EVKIT-SO TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C BOARD TYPE SURFACE MOUNT SURFACE MOUNT SURFACE MOUNT
____________________________Features
o 50 SMA Ports for Testing Transmit and Receive Paths o SMA Port for Prescaler Output o Switches Included to Control Power-Management Features o VCO Frequency, Receiver Gain, and Transmitter Gain Adjustable via On-Board Potentiometers or External Inputs o Fully Assembled and Tested
Evaluate: MAX2420/MAX2421/MAX2422/MAX2460/MAX2463
_______________________________________________________________________Ordering Information
PART MAX2460EVKIT-SO MAX2463EVKIT-SO TEMP. RANGE -40C to +85C -40C to +85C BOARD TYPE SURFACE MOUNT SURFACE MOUNT
______________________________________________________________________________Component List
DESIGNATION QTY DESCRIPTION C1, C4, C5, C7, C9, C10, C12, 15 47pF ceramic capacitors C15, C19, C21-C24, C28, C32 3.3pF (0603) (MAX2420) 0.1pF 4.0pF (0603) (MAX2421) 0.1pF C2, C3 2 4.0pF (0603) (MAX2422) 0.1pF 4.0pF (0603) (MAX2460) 0.1pF 4.7pF (0603) (MAX2463) 0.1pF C6, C14 C8, C11, C13, C20, C25, C29, C30, C31 C16 C17, C18 2 8 1 2 0.1F ceramic capacitors 0.01F ceramic capacitors 1000pF ceramic capacitor 10F, 10%, 10V tantalum capacitors AVX TAJB106K010 or Sprague 2930106X90010B 1.8pF (0603) (MAX2420) 0.1pF 3.6pF (0603) (MAX2421) 0.1pF C26 1 3.0pF (0603) (MAX2422) 0.1pF 1.5pF (0603) (MAX2460) 0.1pF 2.4pF (0603) (MAX2463) 0.1pF C27 D1 0 1 Not installed Dual-varactor diode Alpha SMV1204-199 L4 L5, L7 L6 L8 1 0 1 1 L3 1 L1 L2 1 1 DESIGNATION QTY JU2, JU3, JU4, JU7, JU8 JU2, JU3, JU4, JU7, JU8, GND, VEXT, DGND 5 Shunts DESCRIPTION
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2-pin headers 22nH inductor Coilcraft 0805CS-220XMBC 8.2nH inductor Coilcraft 0805CS-080XMBC 6.8nH, 5% (MAX2420) Coilcraft 0805HS-060TJBC 3.3nH, 5% (MAX2421) Coilcraft 0805HS-030TJBC 3.3nH, 5% (MAX2422) Coilcraft 0805HS-030TJBC 6.8nH, 5% (MAX2460) Coilcraft 0805HS-060TJBC 6.8nH, 5% (MAX2463) Coilcraft 0805HS-060TJBC 100nH inductor Coilcraft 0805CS-101XKBC Not installed 12nH inductor Coilcraft 0805CS-120XMBC 18nH inductor Coilcraft 0805CS-180XMBC 1
________________________________________________________________ Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
MAX2420/MAX2421/MAX2422 MAX2460/MAX2463 Evaluation Kits Evaluate: MAX2420/MAX2421/MAX2422/MAX2460/MAX2463
_______Component List (continued)
DESIGNATION QTY L9 LNA GAIN, TX GAIN, VCO ADJ R1, R2, R3 R4, R5 1 DESCRIPTION 82nH inductor Coilcraft 0805CS-820XKBC 1-pin headers 10k potentiometers 1k, 5% resistors 10, 5% (0603) (MAX2420) resistors 15, 5% (0603) (MAX2421) resistors R6, R7 2 15, 5% (0603) (MAX2422) resistors 15, 5% (0603) (MAX2460) resistors 15, 5% (0603) (MAX2463) resistors R8 R9, R14-R17 R10, R13 R12, R19 R18, R20 RXIN, RXOUT, TXOUT, TXIN, PREOUT, EXT LO INPUT SW1 1 5 2 2 2 47k, 5% resistor 10k, 5% resistors Not installed 301, 1% resistors 49.9, 1% resistors
_________________________Quick Start
The MAX2420 EV kit is fully assembled and factory tested. Do not turn on the DC power and signal sources until all connections are made. Note: The following discussion is based on the MAX2420 with an IF frequency of 10.7MHz and highside LO injection. Refer to Table 2 in the data sheet for the appropriate LO and IF frequencies associated with the MAX2420/MAX2421/MAX2422/MAX2460/MAX2463. * RF-signal generator capable of generating frequencies up to 1GHz * Spectrum analyzer with frequency range at least to 3GHz, such as the HP8561 * Power supply capable of +2.7V to +5.5V output at 100mA
3 3 2
Test Equipment Required
Connections and Signal Conditions
1) Verify that all shunts are installed across jumpers JU2, JU3, JU4, JU7, and JU8. 2) Verify that switch positions 1 through 5 on SW1 are set at the "logic 0" position. 3) Set the power supply to 3.3V, and set the current limit to 100mA. 4) Connect the power supply to the VEXT and GND terminals on the EV kit. 5) For testing the receive path, set the signal-source frequency to 915MHz and the power level to -35dBm. For testing the transmit path, set the signalsource frequency to 10.7MHz and the power level to -0.8dBm.
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SMA connectors (PC edge mount)
1
5-position DIP switch MAX2420EAI, SSOP-28 MAX2421EAI, SSOP-28
U1
1
MAX2422EAI, SSOP-28 MAX2460EAI, SSOP-28 MAX2463EAI, SSOP-28
Analysis
1) Turn on the on-chip oscillator by setting switch VCOON to "logic 1." To observe the VCO frequency, set switch DIV 1 to "logic 1" (disabling the prescaler and enabling the buffer amplifier) and connect an SMA cable from the spectrum analyzer to the PREOUT port. Set the VCO frequency to 925.7MHz by adjusting VCO ADJ (R3). The VCO tuning range is typically 30MHz and may vary slightly due to tolerances in the tank components. 2) The receive conversion gain can be evaluated by setting switch RXON to "logic 1," applying a 915MHz signal to the RXIN port, and observing the RXOUT port at 10.7MHz with the spectrum analyzer. The gain of the LNA in the receiver path can be adjusted by varying R2.
Note: All resistors and capacitors have 0805 footprint, unless otherwise noted.
______________Component Suppliers
SUPPLIER* Alpha Industries AVX Coilcraft Sprague PHONE (617) 935-5150 (803) 946-0690 (847) 639-6400 (603) 224-1961 FAX (617) 933-2359 (803) 626-3123 (847) 639-1469 (603) 224-1430
*Please indicate that you are using the MAX2420/MAX2421/ MAX2422/MAX2460/MAX2463 when contacting these component suppliers.
2
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MAX2420/MAX2421/MAX2422 MAX2460/MAX2463 Evaluation Kits
Note: R12 and R18 are used as a resistive matching network to present an optimum 330 impedance to the RXOUT pin. This network results in a 14.2dB loss in the receiver path. Therefore, 14.2dB must be added to the power level observed on the spectrum analyzer to obtain the true receive output power. For example, with LNA GAIN set at VCC and the receive input level set at -35dBm, the receive output observed on the spectrum analyzer is approximately -27.2dBm. The true receive conversion gain is -27.2 - (-35) + 14.2 = 22dB. If desired, pads for C8, R18, C30, R12, L5, and C20 can be used to build a custom reactivematching network. 3) Receive image rejection can be evaluated by changing the receive input frequency to 936.4MHz (while keeping the LO at 925.7MHz) and comparing the output signal level against the one measured in step 2. 4) Before evaluating the transmitter, ensure that the receiver is disabled by setting switch RXON to "logic 0." The transmit conversion gain can be evaluated by setting switch TXON to "logic 1", applying a 10.7MHz signal at -0.8dBm to the TXIN port, and observing the TXOUT port at 915MHz with a spectrum analyzer. The gain of the input buffer amp in the transmit path can be adjusted by varying R1. Note: R19 and R20 are used as a resistive matching network to present an optimum 330 impedance to the TXIN pin. This network results in a 14.2dB loss in the transmit path. Therefore, 14.2dB must be subtracted from the signal source's power to obtain the input power applied to the MAX2420 (-15dBm). With TX GAIN set at 2V and the transmit input level set at -0.8dBm, the transmit output observed on the spectrum analyzer is approximately -4dBm. The transmit conversion gain is -4 - (-15) = 11dB. If desired, pads for R19, R20, C11, L7, and C25 can be used to build a custom reactive-matching network. 5) Tx image rejection can be evaluated by comparing the desired lower sideband at 915MHz against the unwanted upper sideband at 936.4MHz. an external voltage via the VCO ADJ terminal. The supply providing the external voltage must be properly bypassed to minimize noise added to the LO.
Evaluate: MAX2420/MAX2421/MAX2422/MAX2460/MAX2463
LNA GAIN
The LNA gain can be adjusted using on-board potentiometer R2. LNA gain control can also be accomplished by first removing the shunt from jumper JU2 and then applying an external voltage via the LNA GAIN terminal.
TX GAIN
The transmit buffer amp gain can be adjusted using onboard potentiometer R1. Transmit gain control can also be accomplished by first removing the shunt from jumper JU3 and then applying an external voltage via the TX GAIN terminal.
RXON and TXON
The receive and transmit sections are enabled by setting switches RXON and TXON to "logic 1," respectively. Since the transmit and receive sections share an LO and an IF frequency, interference will result if both sections are active at the same time. When testing either the receive or transmit section, always disable the other section. To disable all chip functions, set all switches to "logic 0." To obtain an accurate reading of the device shutdown current, remove the shunt from JU4 and move the VCC connection from the VEXT terminal to the left side of JU4.
EXT LO Input
An external LO input can be applied by making the following board changes: 1) Remove R6, R7, L3, L4, C2, C3, C26. 2) Add a 0.01F capacitor in place of C27. 3) Replace R6 and R7 with 49.9 resistors. 4) Replace L3 and L4 with shorts. 5) Apply the LO signal at 0dBm to EXT LO input.
Prescaler Control
The function of PREOUT is controlled by the switches labeled "DIV1" and "64" (Table 1).
Table 1. PREOUT Function Control Switches
PREOUT FUNCTION LO buffered output Prescaler, /64 Prescaler, /65 SWITCH "SW1" POSITIONS DIV1 Logic 1 Logic 0 Logic 0 64 Don't care Logic 1 Logic 0
Adjustments and Control
VCO ADJ
The VCO frequency can be tuned by adjusting onboard potentiometer R3. It can also be tuned by first removing the shunt from jumper JU7 and then applying
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3
MAX2420/MAX2421/MAX2422 MAX2460/MAX2463 Evaluation Kits Evaluate: MAX2420/MAX2421/MAX2422/MAX2460/MAX2463
VCC C6 0.1F 1 2 C28 47pF J1 C8 0.01F R12 301 C30 0.01F C14 0.1F VCC CAP1 GND GND GND 28 27 26 C7 47pF L4 100nH R7 C19 47F VCC2 VCO TANK COMPONENTS FOR 915MHz TYPICAL RF PART MAX2420 MAX2421 MAX2422 MAX2460 MAX2463 C2 D1 L3 4 C21 47pF L2 8.2nH C4 47pF TX GAIN 24 R6 5 RXIN 23 C32 47pF C12 47pF VCC2 C3 R4 1k C26 R5 1k R8 47k L9 82nH VCO ADJ JU7 C1 47pF L3 (nH) 6.8 3.3 3.3 6.8 6.8 C26 (pF) 1.8 3.6 3.0 1.5 2.4 C2, C3 R6, R7 (pF) () 3.3 10 4.0 15 4.0 15 4.0 15 4.7 15 VEXT
RXOUT SMA
3 L5 OPEN C20 0.01F
RXOUT TANK
C27 EXTLO J13 OPEN INPUT SMA 25
R18 49.9 VEXT TX GAIN R1 10k JU3 J2
R3 10k
TANK
RXIN SMA
L6 12nH 6
U1
VCC
VCC C5 47pF TXOUT SMA J5 C10 47pF
L1 22nH
VCC C15 47pF
7 8
MAX2420 MAX2421 VCC 22 VCC MAX2422 MAX2460 GND MAX2463
GND TXOUT PREGND LNA GAIN 19 MOD 20 PREOUT 21
VCC2
C31 0.01F J4 C16 1000pF
L8 18nH VEXT R2 10k JU2 C24 47pF
9 LNA GAIN 10
PREOUT SMA
JU6
VCC R19 C11 301 0.01F C29 0.01F C9 47pF
11
VEXT VCC DIV1 18
R9 10k R14 10k
64 1
10
65
TXIN SMA
J3
12 R13* OPEN
TXIN
VCOON
17 R15 10k
DIV1
2
9
64/65 SW1
R20 49.9
L7 OPEN C25 0.01F
R10* OPEN
13 14
RXON N.C. CAP2 TXON
16 R16 10k 15 R17 10k
VCOON
3
8
OFF
BPSK C22 47pF C13 0.01F VCC C23 47pF
RXON
4
7
OFF
VCC2 JU5 VEXT C18 10F 6.3V GND JU8 DGND JU4 C17 10F 6.3V
TXON
5
6
OFF
*USED FOR OTHER PRODUCT VERSIONS.
Figure 1. MAX2420 EV Kit Schematic
4 _______________________________________________________________________________________
MAX2420/MAX2421/MAX2422 MAX2460/MAX2463 Evaluation Kits
Layout Considerations
The EV board can serve as a guide for your board layout. Take care in laying out the oscillator tank circuit. Oscillation frequency is sensitive to parasitic PC board capacitance, trace inductance, and package inductance. Keep the tank layout as symmetrical, tightly packed, and close to the device as possible to minimize LO feedthrough. When using a PC board with a ground plane, a cutout in the ground plane below the oscillator tank reduces parasitic capacitance. Also, keep traces carrying the receive and transmit signals as short as possible to minimize radiation and insertion loss due to the PC board.
Evaluate: MAX2420/MAX2421/MAX2422/MAX2460/MAX2463
1.0"
1.0"
Figure 2. MAX2420 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX2420 EV Kit PC Board Layout--Component Side
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5
MAX2420/MAX2421/MAX2422 MAX2460/MAX2463 Evaluation Kits Evaluate: MAX2420/MAX2421/MAX2422/MAX2460/MAX2463
1.0"
1.0"
Figure 4. MAX2420 EV Kit PC Board Layout--Ground Plane
Figure 5. MAX2420 EV Kit PC Board Layout--Power Plane
1.0"
Figure 6. MAX2420 EV Kit PC Board Layout--Solder Side
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.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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