DEMO CIRCUIT 1710A-D QUICK START GUIDE LTC5593 Dual 2.3GHz to 4.5GHz HIGH DYNAMIC RANGE DOWNCONVERTING MIXER DESCRIPTION Demonstration Circuit 1710A-D is a dual 2.3GHz to The LTC5593s high conversion gain and high dy- 4.5GHz high dynamic range downconverting mixer namic range enable the use of lossy IF filters in featuring the LTC 5593. The LTC5593 is part of a high-selective receiver designs, while minimizing family of dual-channel high dynamic range, high the total solution cost, board space and system- gain downconverting mixers covering the 600MHz level variation. to 4.5GHz frequency range. The Demo Circuit High Dynamic Range Dual Downconverting Mixer Family 1710A-D and the LTC5593 are optimized for DEMO IC PART RF RANGE LO RANGE 2.3GHz to 4.5GHz RF applications. The LO fre- DC1710A-A LTC5590 600MHz-1.7GHz 700MHz-1.5GHz DC1710A-B LTC5591 1.3GHz-2.3GHz 1.4GHz-2.1GHz quency must fall within the 2.1GHz to 4.2GHz DC1710A-C LTC5592 1.6GHz-2.7GHz 1.7GHz-2.5GHz range for optimum performance. A typical appli- DC1710A-D LTC5593 2.3GHz-4.5GHz 2.1GHz-4.2GHz cation is a LTE or WiMAX multichannel or diversity receiver with a 2.3GHz to 2.7GHz RF input. Design files for this circuit board are available. Call The LTC5593 is designed for 3.3V operation, how- the LTC factory. ever the IF amplifiers can be powered by 5V for the highest P1dB. A low current mode is provided for , LT, LTC, LTM, Linear Technology and the Linear Logo are registered trade- marks of Linear Technology Corporation. All other trademarks are the property of power savings, and each of the mixer channels their respective owners. has independent shutdown control. 1 L TC55933 able pins must be pulled high or low. If left floating, the on/off state of the IC will be indeterminate. A APPLICATIONS NOTE logic table for the Enable control (ENA, ENB) is For detailed applications information, please refer shown in Table 1. to the LTC5593 datasheet. TABLE 1. ENABLE CONTROL LOGIC TABLE ENA, ENB MIXER CHANNEL STATE Low Disabled ABSOLUTE MAXIMUM RATINGS High Enabled NOTE. Stresses beyond Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute LOW CURRENT MODE Maximum Rating condition for extended periods may affect device reliability and lifetime. The LTC5593 features a low current mode, which Supply Voltage (VCC) ............................................. 4.0V allows the flexibility to choose a 37% total power IF Supply Voltage (VCCIF) ...................................... 5.5V saving when lower RF performance is acceptable. Enable Voltage (ENA, ENB) ............. -0.3V to V + 0.3V When the ISEL voltage is logic low (<0.3V), both CC Bias Adjust Voltage (IFBA, IFBB) ...... -0.3V to V + 0.3V mixer channels operate at nominal DC current and CC Power Select Voltage (ISEL)............. -0.3V to V + 0.3V best performance. When the ISEL voltage is logic CC LO Input Power (1GHz to 3GHz) ........................... 9dBm high (>2.5V), both mixer channels are in low cur- RFA, RFB Input Power (1GHz to 3GHz)................15dBm rent mode and operate with reduced performance. Operating Temperature Range .................-40C to 105C The ISEL voltage should never fall below -0.3V or exceed the power supply voltage by more than 0.3V. The ISEL pin must be pulled low or high. If SUPPLY VOLTAGE RAMPING left floating, the operating current state of the IC will Fast ramping of the supply voltage can cause a be indeterminate. A logic table for ISEL is shown in current glitch in the internal ESD protection circuits. Table 2. Depending on the supply inductance, this could TABLE 2. ISEL LOGIC TABLE result in a supply voltage transient that exceeds the ISEL OPERATING MODE maximum rating. A supply voltage ramp time of Low Normal current, best performance High Low current, reduced performance greater than 1ms is recommended. Do not clip powered test leads directly onto the demonstration circuits VCC and VCCIF turrets. RF INPUTS Instead, make all necessary connections with Demonstration Circuit 1710A-Ds RF inputs of power supplies turned off, then increase to operat- channel A and channel B are identical. For the RF ing voltage. inputs to be matched, the appropriate LO sig- nal must be applied. The RF inputs impedance is dependent on LO frequency, but the Demonstra- ENABLE FUNCTION tion Circuit 1710A-Ds RF inputs are well matched The LTC5593s two mixer channels can be inde- to 50 from 2.3GHz to 4.5GHz, with better than pendently enabled or disabled. When the Enable 12dB return loss, when a 2.1GHz to 4.2GHz LO voltage (ENA or ENB) is logic high (>2.5V), the cor- signal is applied. responding mixer channel is enabled. When the Enable voltage is logic low (<0.3V), the mixer channel is disabled. The voltages at the enable LO INPUTS pins should never fall below -0.3V or exceed the Demonstration Circuit 1710A-Ds LO input is well power supply voltage by more than 0.3V. The En- matched to 50 from 2.1GHz to 3.4GHz, with bet- 2