19-1673 Rev 0; 9/00 MAX2605–MAX2609 Evaluation Kits The MAX2605–MAX2609 evaluation kits (EV kits) simplify evaluation of this family of voltage-controlled oscillators (VCOs). These kits enable testing of the devices’ performance and require no additional support circuitry. Both signal outputs use SMA connectors to facilitate connection to RF test equipment. These EV kits are fully assembled and tested. Their oscillation frequencies are set to approximately the midrange of the respective VCOs. Component Suppliers PHONE FAX WEBSITE AVX SUPPLIER 803-946-0690 803-626-3123 avx-corp.com Coilcraft 847-639-6400 847-639-1469 coilcraft.com EFJohnson 402-474-4800 402-474-4858 efjohnson.com Murata 814-237-1431 814-238-0490 murata.com Features ♦ Easy Evaluation ♦ Complete, Tunable VCO Test Board with Tank Circuit ♦ Low Phase Noise ♦ Fully Assembled and Tested Ordering Information TEMP. RANGE IC PACKAGE MAX2605EVKIT PART -40°C to +85°C 6 SOT23-6 MAX2606EVKIT -40°C to +85°C 6 SOT23-6 MAX2607EVKIT -40°C to +85°C 6 SOT23-6 MAX2608EVKIT -40°C to +85°C 6 SOT23-6 MAX2609EVKIT -40°C to +85°C 6 SOT23-6 MAX2605 Component List DESIGNATION QTY DESCRIPTION C1, C4 2 1000pF ±5% ceramic capacitors (0603) Murata GRM39COH102J025A or AVX 06035A102JAT2A C2, C3 2 12pF ±5% ceramic capacitors (0603) Murata GRM39COG120J050A C5 1 10µF ±10%, 16V tantalum capacitor AVX TAJC106K016 R1 1 270Ω ±5% resistor (0603) R2, R3 2 Not installed MAX2606 Component List DESIGNATION QTY DESCRIPTION C1, C4 2 1000pF ±5% ceramic capacitors (0603) Murata GRM39COH102J025A or AVX 06035A102JAT2A C2, C3 2 4.7pF ±0.25% ceramic capacitors (0603) Murata GRM39COG4R7C050A C5 1 10µF ±10%, 16V tantalum capacitor AVX TAJC106K016 R1 1 270Ω ±5% resistor (0603) R2, R3 2 Not installed R4 1 10Ω ±5% resistor (0603) L1, L2 2 Not installed 680nH inductors Coilcraft 1008CS-681XJBC L3 1 270nH ±2% inductor Coilcraft 1008CS-271XJBC 1 1.2µH inductor Coilcraft 1206CS-122XJBC L4, L5 2 330nH inductor Coilcraft 1008CS-331XJBC U1 1 MAX2605EUT U1 1 MAX2606EUT J1, J2 2 SMA connectors (edge mount) EFJohnson 142-0701-801 or Digi-Key J502-ND J1, J2 2 SMA connectors (edge mount) EFJohnson 142-0701-801 or Digi-Key J502-ND VCC,GND, TUNE 6 Test points Digi-Key 5000K-ND VCC,GND, TUNE 6 Test points None 1 MAX2605/6/7 EV kit circuit board None 1 MAX2605/6/7 EV kit circuit board None 1 MAX2605–MAX2609 data sheet None 1 MAX2605–MAX2609 data sheet R4 1 10Ω ±5% resistor (0603) L1, L2 2 Not installed L4, L5 2 L3 ________________________________________________________________ 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. Evaluate: MAX2605–MAX2609 General Description MAX2605–MAX2609 Evaluation Kits Evaluate: MAX2605–MAX2609 MAX2607 Component List DESIGNATION QTY DESCRIPTION C1, C4 2 1000pF ±5% ceramic capacitors (0603) Murata GRM39COH102J025A or AVX 06035A102JAT2A C2, C3 2 3pF ±0.25% ceramic capacitors (0603) Murata GRM39COG030C050A C5 1 10µF ±10%, 16V tantalum capacitor AVX TAJC106K016 R1 1 270Ω ±5% resistor (0603) R2, R3 2 Not installed R4 1 10Ω ±5% resistor (0603) L1, L2 2 Not installed 1 68nH ±2% inductor Coilcraft 1008CS-680XJBC L4, L5 2 120nH inductors Coilcraft 1008CS-121XJBC U1 1 MAX2607EUT 2 SMA connectors (edge mount) EFJohnson 142-0701-801 or Digi-Key J502-ND L3 J1, J2 VCC,GND, TUNE 6 Test points None 1 MAX2605/6/7 EV kit circuit board None 1 MAX2605–MAX2609 data sheet Quick Start The MAX2605–MAX2609 evaluation kits are fully assembled and factory tested. Follow the instructions in the Connections and Setup section for proper device evaluation. Test Equipment Required • Low-noise power supplies (these are recommended for oscillator noise measurement). Noise or ripple will frequency-modulate the oscillator and cause spectral spreading. Batteries can be used in place of power supplies, if necessary. – Use a DC power supply capable of supplying +2.7V to +5.5V. Alternatively, use two or three 1.5V batteries. 2 MAX2608 Component List DESIGNATION QTY DESCRIPTION C1 1 1000pF ±5% ceramic capacitor (0603) Murata GRM39COH102J025A or AVX 06035A102JAT2A C2, C3 2 1pF ±0.25% ceramic capacitors (0603) Murata GRM39COG010C050A C4, C6 2 100pF ±5% ceramic capacitors (0603) Murata GRM39COG101J050A C5 1 10µF ±10%, 16V tantalum capacitor AVX TAJC106K016 R1 1 270Ω ±5% resistor (0603) R2, R3 2 Not installed R4 1 10Ω ±5% resistor (0603) L1 1 22nH ±2% inductor Coilcraft 0805CS-220XGBC L4, L5 2 68nH ±2% inductors Coilcraft 0805CS-680XJBC U1 1 MAX2608EUT J1, J2 2 SMA connectors (edge mount) EFJohnson 142-0701-801 or Digi-Key J502-ND VCC,GND, TUNE 6 Test points Digi-Key 5000K-ND None 1 MAX2608/9 EV kit circuit board None 1 MAX2605–MAX2609 data sheet – Use a DC power supply capable of supplying +0.4V to +2.4V, continuously variable, for TUNE. Alternatively, use two 1.5V batteries with a resistive voltage divider or potentiometer. • An RF spectrum analyzer that covers the operating frequency range of the MAX2605–MAX2609 • A 50Ω coaxial cable with SMA connectors • An ammeter (optional) Connections and Setup 1) Connect a DC supply (preset to +3V) to the VCC and GND terminals (through an ammeter, if desired) on the EV kit. 2) Turn on the DC supply. If used, the ammeter reading _______________________________________________________________________________________ MAX2605–MAX2609 Evaluation Kits DESIGNATION QTY DESCRIPTION C1 1 1000pF ±5% ceramic capacitors (0603) Murata GRM39COH102J025A or AVX 06035A102JAT2A C2, C3 2 1pF ±0.25% ceramic capacitors (0603) Murata GRM39COG010C050A C4, C6 2 100pF ±5% ceramic capacitors (0603) Murata GRM39COG101J050A C5 1 10µF ±10%, 16V tantalum capacitor AVX TAJC106K016 270Ω ±5% resistor (0603) R1 1 R2, R3 2 Not installed R4 1 10Ω ±5% resistor (0603) L1 1 8.2nH ±2% inductor Coilcraft 0805CS-080XGBC L4, L5 2 27nH ±2% inductors Coilcraft 0805CS-270XJBC U1 1 MAX2609EUT J1, J2 2 SMA connectors (edge mount) EFJohnson 142-0701-801 or Digi-Key J502-ND VCC,GND, TUNE 6 Test points Digi-Key 5000K-ND None 1 MAX2608/9 EV kit circuit board None 1 MAX2605–MAX2609 data sheet coupling from the supply. Also, place the VCO as far away as possible from the noisy section of a larger system, such as a switching regulator or digital circuits. The VCO’s performance is strongly dependent on the availability of the external tuning inductor. For best performance, use high-Q components and choose their values carefully. To minimize the effects of parasitic elements, which degrade circuit performance, place the tuning inductor and CBYP close to the VCO. For higherfrequency versions, include the parasitic PC board inductance and capacitance when calculating the oscillation frequency. In addition, remove the ground plane around and under the tuning inductor to minimize the effect of parasitic capacitance. Noise on TUNE translates into FM noise on the outputs; therefore, keep the trace between TUNE and the control circuitry as short as possible. If necessary, use an RC filter to further suppress noise, as done on the EV kits. approximates the typical operating current specified in the MAX2605–MAX2609 data sheet. 3) Connect the VCO output (OUT+ or OUT-) to a spectrum analyzer with a 50Ω coaxial cable. 4) Apply a positive variable DC voltage between 0.4V and 2.4V to TUNE. 5) Check the tuning bandwidth on the spectrum analyzer by varying the tuning voltage (+0.4V to +2.4V). Layout Considerations The EV kit PC board can serve as a guide for laying out a board using the MAX2605–MAX2609. Generally, the VCC pin on the PC board should have a decoupling capacitor placed close to the IC. This minimizes noise _______________________________________________________________________________________ 3 Evaluate: MAX2605–MAX2609 MAX2609 Component List Evaluate: MAX2605–MAX2609 MAX2605–MAX2609 Evaluation Kits L1 OPEN L2 OPEN C3 1 IND OUT+ OUT+ SMA 6 R3 OPEN L4 L3 U1 2 GND MAX2605 MAX2606 MAX2607 VCC R4 10Ω 5 VCC R2 OPEN L5 R1 270Ω C4 1000pF + C5 10V 10µF GND C2 3 TUNE TUNE OUT- 4 OUTSMA C1 1000pF Figure 1. MAX2605/MAX2606/MAX2607 EV Kits Schematic C3 1 IND OUT+ OUT+ SMA 6 L4 L1 R3 OPEN U1 2 GND MAX2608 MAX2609 VCC R4 10Ω 5 VCC L5 R1 270Ω TUNE R2 OPEN C6 100pF C4 100pF + GND C2 3 TUNE OUT- 4 OUTSMA C1 1000pF Figure 2. MAX2608/MAX2609 EV Kits Schematic 4 C5 10V 10µF _______________________________________________________________________________________ MAX2605–MAX2609 Evaluation Kits Evaluate: MAX2605–MAX2609 1.0" 1.0" Figure 3. MAX2605/MAX2606/MAX2607 EV Kits Component Placement Guide—Top Silk Screen 1.0" Figure 4. MAX2608/MAX2609 EV Kits Component Placement Guide—Top Silk Screen 1.0" Figure 5. MAX2605/MAX2606/MAX2607 EV Kits PC Board Layout—Component Side Figure 6. MAX2608/MAX2609 EV Kits PC Board Layout— Component Side _______________________________________________________________________________________ 5 Evaluate: MAX2605–MAX2609 MAX2605–MAX2609 Evaluation Kits 1.0" Figure 7. MAX2605/MAX2606/MAX2607/MAX2608/MAX2609 EV Kits PC Board Layout—Ground Plane 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 © 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.