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 LTC2358-18 is an 18-bit, low noise 8-channel simultaneous sampling successive approximation register (SAR) ADC with buffered differential, wide common mode range picoamp inputs. Operating from a 5V low voltage supply, flexible high voltage supplies, and using the internal reference and buffer, each channel of this SoftSpan? ADC can be independently configured on a conversion-by-conversion basis to accept ?10.24V, 0V to 10.24V, ?5.12V, or 0V to 5.12V signals. Individual channels may also be disabled to increase throughput on the remaining channels.The integrated picoamp-input analog buffers, wide input common mode range and 128dB CMRR of the LTC2358-18 allow the ADC to directly digitize a variety of signals using minimal board space and power. This input signal flexibility, combined with ?3.5LSB INL, no missing codes at 18 bits, and 96.4dB SNR, makes the LTC2358-18 an ideal choice for many high voltage applications requiring wide dynamic range.The LTC2358-18 supports pin-selectable SPI CMOS (1.8V to 5V) and LVDS serial interfaces. Between one and eight lanes of data output may be employed in CMOS mode, allowing the user to optimize bus width and throughput.Applications Programmable Logic Controllers Industrial Process Control Power Line Monitoring Test and Measurement

The LT1997-2 is an attenuating (funnel) difference amplifierthat can be used to translate large differential signals tothe low voltage range compatible with ADCs. It combinesa precision operational amplifier with highly-matched resistorsto form a one-chip solution to attenuate and levelshift voltages accurately using no external components.It comes with three standard pin-selectable gain options(0.1, 0.2 and 0.25), which can be further combined toform gains from 0.0455 to 0.55 (attenuations of 1.82 to22) with accuracy of 0.006% (60ppm). The LT1997-2 alsoworks across a very wide input common-mode voltagerange (?255V), enabling robust operation in demandingindustrial environments. Its excellent resistor matchingresults in a common mode rejection ratio of greater than105dB.The resistors maintain their excellent matching overtemperature; the matching temperature coefficient isguaranteed less than 1ppm/?C. The resistors are extremelylinear with voltage, resulting in a gain nonlinearity of lessthan 2ppm.The LT1997-2 is fully specified at 5V and ?15V suppliesand from ?40?C to 125?C. The device is available in spacesaving 16-lead MSOP and 4mm ? 4mm DFN14 packages.APPLICATIONS High Voltage to Low Voltage Level Translation ADC Driver Bidirectional Wide Common Mode Range Voltage and Current Sensing Industrial Data-Acquisition Front-Ends Replacement for Isolation Circuits Differential to Single-Ended Conversion

DC1335B-B: Demo Board for the LTC4269-1 - IEEE 802.3at PD with Synchronous No-Opto Flyback Controller

The LTC2302/LTC2306 are low noise, 500ksps, 1-/2-channel, 12-bit ADCs with an SPI/MICROWIRE compatible serial interface. These ADCs include a fully differential sample-and-hold circuit to reduce common mode noise. The internal conversion clock allows the external serial output data clock (SCK) to operate at any frequency up to 40MHz. The LTC2302/LTC2306 operate from a single 5V supply and draw just 2.8mA at a sample rate of 500ksps. The auto-shutdown feature reduces the supply current to 14?A at a sample rate of 1ksps. The LTC2302/LTC2306 are packaged in a tiny 10-pin 3mm x 3mm DFN. The low power consumption and small size make the LTC2302/LTC2306 ideal for battery-operated and portable applications, while the 4-wire SPI compatible serial interface makes these ADCs a good match for isolated or remote data acquisition systems.Applications High Speed Data Acquisition Industrial Process Control Motor Control Accelerometer Measurements Battery-Operated Instruments Isolated and/or Remote Data Acquisition

Demonstration circuit 1349A is a polyphase 3-output step-down supply with tracking featuring the LTC3853EUJ. The input voltage range is 6.5V to 14V. For applications with narrow, 5V ±0.5V input range, the board has an optional resistor to tie the INTVCC pin to the VIN pin. The demo board provides three 15A outputs, with output voltages of 1.8V, 1.2V and 2.5V. The main features of the board include rail tracking, an internal 5V linear regulator for bias, RUN pins for each output, two PGOOD signals and a Mode selector that allow the converter to run in CCM, pulse skip or Burst Mode operation. Synchronization to an external clock is also possible through some minor component changes.

The LTC2226H is a 12-bit 25Msps, low power 3V A/D converter designed for digitizing high frequency, wide dynamic range signals. The LTC2226H is perfect for demanding imaging and communications applications with AC performance that includes 71.4dB SNR and 90dB SFDR. DC specs include ?0.3LSB INL (typ), ?0.3LSB DNL (typ) and no missing codes over temperature. The transition noise is a low 0.25LSBRMS. A single 3V supply allows low power operation. A separate output supply allows the outputs to drive 0.5V to 3.6V logic. A single-ended CLK input controls converter operation. An optional clock duty cycle stabilizer allows high performance at full speed for a wide range of clock duty cycles.Applications Automotive Industrial Wireless and Wired Broadband Communication

The LTC4221 is a 2-channel Hot Swap? controller that allows a board to be safely inserted and removed from a live backplane. Using two independent high side gate drivers to control two external N-channel pass transistors, the output voltages can be ramped up with current foldback to limit the inrush current during the start-up period. No external compensation capacitors are required at the GATE pins. The two channels can be configured to ramp up and down separately or simultaneously for supply voltages ranging from 2.7V to 13.5V and 1V to 13.5V for channels 1 and 2 respectively.Each channel has two current limit comparators that provide dual level and dual speed overcurrent circuit breaker protection after the start-up period. If any current sense voltage exceeds 100mV for 1?s or 25mV for the timeout delay (set by the CFILTER at the FILTER pin), then the FAULT latch is set and both GATE pins are pulled low.The FB pins monitor the respective channel output voltages and provide the inputs for the PWRGD comparators as well as overvoltage protection.Applications Electronic Circuit Breaker Power Supply Sequencing Live Board Insertion and Removal Industrial High Side Switch/Circuit Breaker