The LT6236/LT6237/LT6238 are single/dual/quad low noise, rail-to-rail output op amps that feature 1.1nV/?Hz input referred noise voltage density and draw only 3.5mA of supply current per amplifier. These amplifiers combine very low noise and supply current with a 215MHz gain bandwidth product and a 70V/?s slew rate. Low noise, fast settling time and low offset voltage make this amplifier optimal to drive low noise, high speed SAR ADCs. The LT6236 includes a shutdown feature that can be used to reduce the supply current to less than 10?A.This amplifier family has an output that swings within 50mV of either supply rail to maximize the signal dynamic range in low supply applications and is specified on 3.3V, 5V and ?5V supplies.The LT6236/LT6237/LT6238 are upgrades to the LT6230/LT6231/LT6232, offering similar performance with reduced wideband noise beyond 100kHz.Applications 16-Bit and 18-Bit SAR ADC Drivers Active Filters Low Noise, Low Power Signal Processing

Demonstration circuit DC2448A-B features a PolyPhase® design using the LTM4636EY, a 40A high efficiency, switch mode step-down power µModule® regulator. The input voltage range is from 4.7V to 15V. When VIN < 5.5V, short PVCC to VIN with R1 = 0Ω, and set R3 = 0Ω and remove R2. The output voltage range is 0.6V to 3.3V. The DC2448A-B can deliver a nominal 120A output current. As explained in the data sheet, output current derating is necessary for certain VIN, VOUT, and thermal conditions. The board operates in continuous conduction mode in heavy load conditions. For high efficiency at low load currents, the MODE_PLLIN jumper selects pulse-skipping mode for noise sensitive applications or Burst Mode® operation in less noise sensitive applications. The MODE_PLLIN pin also allows the LTM4636 to synchronize to an external clock signal. The phases of the three LTM4636s are 0 degrees, 120 degrees and 240 degrees. DC2448A-B has the option of choosing both internal and external compensation circuit for LTM4636. The LTM4636 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit DC2448A-B.

The LTC5562 is a versatile low power mixer optimized for applications requiring very wide input bandwidth, low distortion, and low LO leakage. This mixer can be used for either upconverting or downconverting applications, and provides a nominal conversion gain of 1dB. Demonstration circuit 2483A-A showcases the LTC5562 mixer for upconverting applications while demonstration circuit 2483A-B is tuned for downconverting applications. The differential inputs are optimized for use with 1:1 transmission- line baluns, allowing very wideband impedance matching. The LTC5562 uses a 3.3V supply for low power consumption and an enable pin allows the part to be shut down for further power savings. The total mixer current is adjustable, allowing for even further power savings. The standard match frequency ranges for each board are outlined in the table below.

Demonstration circuit 2505A is a low IQ, Silent Switcher® synchronous boost converter featuring the LT8336. DC2505A is designed to convert an 8V to 20V source to 24V output, with up to 1.5A load current, depending on the input voltage. DC2505A operates at 2MHz switching frequency. The DC2505A contains a selectable jumper, JP1, to aid in the selection of the desired SYNC pin mode of operation. The default setting is pulse-skipping mode of operation. The DC2505A has an EMI filter installed. The EMI filter can be included by connecting the source to the VEMI terminal and the output to the VOUT2 terminal. The Performance Summary section details the ratings of the DC2505A at room temperature. The LT8336 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide for DC2505A.

The LTC2986 measures a wide variety of temperature sensors and digitally outputs the result, in ?C or ?F, with 0.1?C accuracy and 0.001?C resolution. The LTC2986 can measure the temperature of virtually all standard (Type B, E, J, K, N, S, R, T) or custom thermocouples, automatically compensate for cold junction temperatures and linearize the results. The device can also measure temperature with standard 2-, 3-, or 4-wire RTDs, thermistors, and diodes. The LTC2986 includes excitation current sources and fault detection circuitry appropriate for each type of temperature sensor.The LTC2986/LTC2986-1 are 10-channel software and pin-compatible versions of the 20-channel LTC2983/LTC2984. Additional features include special modes that enable easy protection in universal multi-sensor applications, custom tables for generic ADC readings, and direct temperature readout from active analog temperature sensors. The LTC2986-1 is the EEPROM version of the LTC2986.Applications Direct Thermocouple Measurements Direct RTD Measurements Direct Thermistor Measurements Custom Sensor Applications

Demonstration circuit 2524A is optimized for evaluation of the LTC5555 programmable gain downconverting mixer. The IC incorporates an active mixer and a digital IF VGA with 15.5dB gain control range. The IF gain is programmed in 0.5dB steps through the SPI or parallel interface. The LTC5555 has single-ended 50Ω RF input, single-ended or differential-drive LO input, and differential IF output. It features an enable pin for fast turn-on and shutdown. A reduce power mode is also available through SPI or a CMOS logic pin reducing the total current consumption by approximately 25%. Demonstration circuit 2524A’s RF input port is 50Ω matched from 2.6GHz to 6.4GHz and can be easily tuned down to 1.5GHz or up to 7GHz. The LO port is 50Ω matched from 500MHz to 7GHz. The demo circuit’s differential IF outputs has 100Ω differential impedance and are match for 115MHz to 495MHz IF frequencies. The IF outputs can be modified for other IF frequencies or impedances. Transformer footprint pads are included on the PCB allowing the use of IF transformer to provide 50Ω single-ended IF output. See data sheet for more details on input and output impedance matching. CAUTION: This part is sensitive to electrostatic discharge (ESD). Observe proper ESD precautions when handling the LTC5555.

Demonstration circuit 2535A is a 42V, dual channel, 2A synchronous step-down regulator featuring the LT8653S. The LT8653S is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator which features the second generation Silent Switcher® technology that minimizes EMI and reduces PCB layout sensitivity. The demo board is designed for two outputs: 5V and 3.3V from a 5.5V to 42V input. Each output can source up to 2A continuous current at the same time. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The integrated power switches and other necessary circuitry reduce the external component count and simplify design. Selectable spread spectrum mode of operation can further improve EMI/EMC performance. Ultralow quiescent current in Burst Mode® operation achieves high efficiency at very light loads. The DC2535A demo board is 3" by 3" in size and has four layers with 2oz copper on the outer layers and 1oz copper on the inner layers. The DC2535A operates at 2MHz switching frequency by default to minimize solution size. The LT8653S is assembled in a small thermally enhanced 4mm × 3mm LQFN package. The IC temperature rises about 50°C when both channels operate at full load, 2A each, with the default switching frequency of 2MHz. The jumper JP2 on the demo board determines the configuration of the SYNC pin of the LT8653S. By default, the SYNC pin on the demo board is grounded for low ripple Burst Mode operation. Moving JP2 to FCM W/SSM enables the spread spectrum mode of operation by tying the SYNC pin to VCC pin. To synchronize to an external clock, move JP2 to FCM W/O SSM OR SYNC position and apply the external clock on the SYNC turret. The jumpers JP3 and JP4 on the demo board determine the configuration of the output voltage select bit pins D0 and D1. On the DC2535A, the D0 and D1 pins are by default floating. This combination connects internal feedback resistor divider between the FB1/FB2 pins and the error amplifier which means that FB1 and FB2 pins are regulated to 5V and 3.3V respectively. On the DC2535A, FB1/FB2 pins are by default connected through 0Ω resistors to the output nodes. Refer to the LT8653S data sheet for more information on the D0 and D1 pin settings. The demo board has an EMI filter installed. The EMI performance of the demo board (with EMI filter) is shown in Figure 1 and Figure 2. The black lines in Figure 2 are CISPR 25 class 5 limits. To achieve EMI/EMC performance as shown in Figure 2, the input EMI filter is required and the input voltage should be applied at VEMI terminal. The LT8653S data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this manual for demo circuit 2535A.

The LTC4125 is a simple and high performance monolithic full bridge resonant driver capable of delivering over 5W of power wirelessly to a properly tuned receiver. The device controls the current flow in a series connected transmit coil LC network to create a simple, safe and versatile wireless power transmitter.The LTC4125 automatically adjusts its driving frequency to match the LC network resonant frequency. This AutoResonant switching allows the device to deliver maximum power from a low voltage input supply (3V to 5.5V) to a tuned receiver. To optimize system efficiency, the LTC4125 employs a periodic transmit power search and adjusts the transmission power based on the receiver load requirements. The device stops delivering power during a fault condition, or if a foreign object is detected.The LTC4125 also includes a programmable maximum average input current limit and an NTC input as additional means for foreign object and overload protection. The LTC4125 is available in a 20-lead low profile (0.75mm) 4mm ? 5mm QFN package.Applications Hermetically and/or Electrically Insulated Devices Military Sensors and Devices Medical Equipment Industrial Handhelds

The LTC4091 is a 36V Li-Ion battery charger and power backup manager. The integrated step-down switching regulator charges a battery from a primary power source while providing power to the load. If primary power is lost, the load is seamlessly transitioned to the backup Li-ion/polymer battery. To protect sensitive downstream loads, the maximum output voltage is 4.45V.The LTC4091 provides an adaptive output that tracks the battery voltage for high efficiency charging. The charge current is programmable and an end-of-charge status output (CHRG) indicates full charge. Also featured is a termination timer and an NTC thermistor input used to monitor battery temperature while charging.During backup, an internal 75m? ideal diode connects the battery to the load. An optional external ideal diode FET driver is available to reduce the voltage drop even further. 4.1V or 4.2V battery charge voltages can be selected.Applications Fleet and Asset Tracking Automotive GPS Data Loggers Automotive Telematics Systems Battery Backup Systems

The LTM4622A is a complete dual 2A step-down switching mode ?Module? (micromodule) regulator in a tiny ultrathin 6.25mm ? 6.25mm ? 1.82mm LGA and 2.42mm BGA packages. Included in the package are the switching controller, power FETs, inductor and support components. Operating over an input voltage range of 3.6V to 20V, the LTM4622A supports an output voltage range of 1.5V to 12V, set by a single external resistor. Its high efficiency design delivers dual 2A continuous, 3A peak, output current. Only a few ceramic input and output capacitors are needed.The LTM4622A supports selectable Burst Mode operation and output voltage tracking for supply rail sequencing. Its high switching frequency and current mode control enable a very fast transient response to line and load changes without sacrificing stability.Fault protection features include input overvoltage, output overcurrent and overtemperature protection.The LTM4622A is available with SnPb (BGA) or RoHS compliant terminal finish. Vin Range Vout Range Iout LTM4622 3.6V to 20V 0.6V to 5.5V Dual 2.5A or Single 5A LTM4622A 3.6V to 20V 1.5V to 12V Dual 2A or Single 4A APPLICATIONS General Purpose Point-of-Load Conversion Telecom, Networking and Industrial Equipment Medical Diagnostic Equipment Test and Debug Systems