Demonstration circuit DC675C is for the evaluation of filter circuits using an LT1568. The LT1568 is a dual 2nd order active-RCfilterbuildingblockwithprecision ±0.75% capacitors and low noise op amps with 180MHz GBW trimmed to ±10% maximum variation. The ±10% GBW variation of the LT1568 op amps allows for minimizing the higher frequency error by decreasing resistor values. The cutoff or center frequency (fC) range of an LT1568 filter is 200kHz to 10MHz (5MHz for a bandpass filter). The low limit of 200kHz was chosen only to minimize resistor noise and DC offsets (using external capacitors the fC frequency can be less than 200kHz). For testing and evaluation, the DC675C assembly is configured as a single 4th order, 500kHz narrow passband bandpass filter. For other possible LT1568 configurations, the DC675C has unused pads for 0805 surface mount resistors and capacitors preconfigured with PCB traces to allow for the following high accuracy LT1568 filter circuits: 4th order lowpass filter 5th order lowpass filter 4th order narrow passband bandpass 4th order wide passband bandpass 4th order highpass filter Refer to the LT1568 data sheet for additional information about filter circuit configurations.

DC697A: Demo Board for the LT1943 High Current Quad Output Regulator for TFT LCD Panels.

DC705A: Demo Board for the LTC4053-4.2 USB Compatible Lithium-Ion Battery Charger with Thermal Regulation.

Demonstration circuit 728 is a 1MHz Synchronous Step- Up DC/DC Converter featuring the LTC®3458EDE. The demo circuit demonstrates a DC/DC boost converter, with a 1.5A switch, providing 7V at 200mA to 800mA depending on input voltage, which ranges from 2V to 6V. The circuit demonstrates the advantages of output disconnect and inrush current limiting.

DC730A: Demo Board for the LTC5536 600MHz to 7GHz Precision RF Detector with Fast Comparator Output.

Demonstration circuit 741 is an ultralow dropout voltage supply using the 300mA output current LTC3025 linear regulator in the small 2mm x 2mm 6-Pin DFN package. The DC741 has an input voltage range from 0.9V to 5.5V and a jumper-selectable output voltage of 0.8V, 1.2V, 1.5V, 1.8V or a user-defined value between 0.4V and 3.6V. The 0.4V reference of the LTC3025 allows the DC741 to supply power to very low voltage applications. The DC741 is also an excellent choice for post-regulation of step-down switching regulators, creating a high efficiency low-noise supply. The DC741 comes assembled with small ceramic capacitors, showing the LTC3025's ability to maintain stability with ceramic output capacitors.

DC756A: Demo Board for the LTC4150 Coulomb Counter/Battery Gas Gauge.

The LTC5535 is an RF power detector for RF applications operating in the 600MHz to 7GHz range. A temperature compensated Schottky diode peak detector and output amplifier are combined in a small ThinSOTTM package. The supply voltage range is optimized for operation from a single cell lithium-ion or three cell NiMH battery.The RF input voltage is peak detected using an on-chip Schottky diode. The detected voltage is buffered and supplied to the VOUT pin.The LTC5535 output amplifier gain is set via external resistors. The initial starting voltage of 200mV can be precisely adjusted using the VOS pin.The LTC5535 operates with input power levels from ?32dBm to 10dBm. The 12MHz baseband bandwidth is much higher than that of previous Schottky detector products.Applications 802.11a, 802.11b, 802.11g, 802.15, 802.16 Multimode Mobile Phone Products Optical Data Links Wireless Data Modems Wireless and Cable Infrastructure RF Power Alarm Envelope Detector

DC782A-D: Demo Board for the LTC2246 14-Bit, 25Msps Low Power 3V ADCs.

The LTC2229 is a 12-bit 80Msps, low power 3V A/D converter designed for digitizing high frequency, wide dynamic range signals. The LTC2229 is perfect for demanding imaging and communications applications with AC performance that includes 70.6dB SNR and 90dB SFDR for signals well beyond the Nyquist frequency.DC specs include ?0.4LSB INL (typ), ?0.2LSB DNL (typ) and no missing codes over temperature. The transition noise is a low 0.3LSBRMS.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 Wireless and Wired Broadband Communication Imaging Systems Ultrasound Spectral Analysis Portable Instrumentation