Evaluates: MAX2057 19-3551 Rev 0 1/05 MAX2057 Evaluation Kit General Description Features The MAX2057 evaluation kit (EV kit) simplifies evalua- Analog Gain Control tion of the MAX2057 general-purpose, high-perfor- Up to 42dB Gain-Control Range mance, variable-gain amplifier with analog gain control. The EV kit is fully assembled and tested at the factory. 1700MHz to 2500MHz Frequency Range Standard 50 SMA connectors are included at the Fully Assembled and Tested input and output of the EV kit to allow quick and easy evaluation on the test bench. Input and Output Internally Matched to 50 Over This data sheet provides a list of equipment required to Entire Band Of Operation evaluate the device, a straightforward test procedure to 50 SMA Inputs and Outputs for Easy Testing of verify functionality, a circuit schematic for the kit, a bill All MAX2057 Features of materials (BOM) for the kit, and artwork for each layer of the PC board. Component Suppliers Ordering Information SUPPLIER PHONE WEBSITE PART TEMP RANGE IC PACKAGE Johnson 507-833-8822 www.johnsoncomponents.com MAX2057EVKIT -40C to +85C 36 Thin QFN-EP* Murata 770-436-1300 www.murata.com *EP = Exposed paddle. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION R2 1 2k 1% resistor (0402) 22pF 5%, 50V C0G ceramic C1, C3, C5, R3, R4 2 0 resistors (0402) 4 capacitors (0402) C7, C10 Murata GRP1555C1H220J Large test point for 0.062in PC TP1 1 board (red) 1000pF 10%, 50V X7R ceramic C2, C4, C6, Mouser 151-107 or equivalent 5 capacitors (0402) C8, C9 Murata GRP155R71H102K Large test point for 0.062in PC TP2 1 board (black) C11, C12, C16 0 Not installed (0603) Mouser 151-103 or equivalent 0.1F 10%, 16V X7R ceramic Analog VGA IC C13, C14, C15 3 capacitors (0603) (36-pin, 6mm x 6mm thin QFN-EP) Murata GRM188R71C104K Maxim MAX2057ETX 0.75pF 0.1pF, 50V C0G ceramic NOTE: U1 HAS AN EXPOSED C17 0 capacitor (0402) PADDLE CONDUCTOR THAT U1 1 Murata GRP1555C1HR75B REQUIRES IT TO BE SOLDER ATTACHED TO A GROUNDED PAD PC-board edge-mount SMA RF ON THE PC BOARD TO ENSURE A J1J5 5 connectors (flat-tab launch) PROPER ELECTRICAL/THERMAL Johnson 142-0741-856 DESIGN. R1 1 1.2k 1% resistor (0402) Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX2057 Evaluation Kit 2) With its supply output disabled, set the voltage on the Quick Start other DC supply to 1V and connect to the gain-control The MAX2057 EV kit is fully assembled and factory tested. connector VCNTL (J3) on the EV kit. If available, set Follow the instructions in the Connections and Setup the current limit to 1mA. section for proper device evaluation. 3) With the generator output disabled, connect the RF Test Equipment signal generator to J1. Set the generator to a One DC power supply capable of supplying 5V 2100MHz output frequency, and set the power level and 0.3A to -12dBm. One DC power supply that can be adjusted from 1V 4) Connect the spectrum analyzer to J2. Set the spec- to 4.5V for gain control trum analyzer to a center frequency of 2100MHz and a total span of 1MHz. Set the reference level on Two digital multimeters (DMM) to monitor V and CC the spectrum analyzer to +10dBm. I , if desired CC 5) Enable the V supply. Next, enable the gain-control HP 8648 (or equivalent) signal source CC supply. Finally, enable the RF generators output. A HP 8561E (or equivalent) spectrum analyzer 2100MHz signal with a magnitude of approximately HP 8753D (or equivalent) network analyzer to mea- 3dBm should be displayed on the spectrum analyzer. sure return loss and gain over frequency (optional) Be sure to account for external cable losses. Connections and Setup 6) Vary the gain-control supply voltage between +1.0V This section provides a step-by-step guide to testing the and +4.5V. The output power should vary by basic functionality of the EV kit. To prevent damaging the approximately 21dB. device, do not turn on DC power or RF signal genera- 7) Gain can also be determined with a network analyzer. tors until all connections are made. Do not apply This has the advantage of displaying gain over a VCNTL without V present (see the VCNTL section). CC swept frequency band, in addition to displaying input and output return loss. Refer to the network Testing the Supply Current analyzer manufacturers user manual for setup 1) Connect 50 terminations to J1 and J2. details (optional). 2) With its output disabled, set the voltage on one of the DC supplies to +5.0V (through a low internal Detailed Description resistance ammeter, if desired) and connect to the Figure 1 shows the schematic for the MAX2057 EV kit. +5.0V (TP1) and GND (TP2) terminals on the EV kit. C1, C3, C5, and C7 are DC-blocking capacitors for the If the power supply has a current-limiting feature, IN A, IN, AMP IN, and OUT pins. To reduce the possi- set the current limit to 250mA. bility of noise pickup from the power supply, capacitors 3) With its output disabled, set the voltage on the sec- C2, C4, C6, C8, C9, C10, C13, C14, and C15 are used ond DC supply to 1V and connect to the gain-control to decouple V . Resistors R1 and R2 are used to bias CC connector VCNTL (J3) on the EV kit. This configures the amplifiers first and second stages, respectively. the device for its maximum gain setting. If the power Current-Setting Resistors supply has a current-limiting feature, set the current The MAX2057 amplifier section is a two-stage design limit to 1mA. whose input stage current is set by the external resistor 4) Enable the V supply, then enable the gain-control CC R1, while the output stage current is set by resistor R2. supply the V supply current should read approxi- CC These resistors were optimized at the factory to pro- mately 180mA. duce the highest OIP3 for a given current. The current of the device can be reduced by increasing these Testing the Power Gain resistor values (see the Modifying the EV Kit section), 1) With its supply output disabled, set the voltage on one but linearity performance degrades. of the DC supplies to +5.0V (through a low internal resistance ammeter, if desired) and connect to the +5.0V (TP1) and GND (TP2) terminals on the EV kit. If available, set the current limit to 250mA. 2 Evaluates: MAX2057