Analog Devices Inc./Maxim Integrated

The LTC1155 dual high side gate driver allows using low cost N-channel FETs for high side switching applications. An internal charge pump boosts the gate above the positive rail, fully enhancing an N-channel MOSFET with no external components. Micropower operation, with 8μA standby current and 85μA operating current, allows use in virtually all systems with maximum efficiency.Included on-chip is overcurrent sensing to provide automatic shutdown in case of short circuits. A time delay can be added in series with the current sense to prevent false triggering on high in-rush loads such as capacitors and incandescent lamps.The LTC1155 operates off of a 4.5V to 18V supply input and safely drives the gates of virtually all FETs. The LTC1155 is well suited for low voltage (battery-powered) applications, particularly where micropower "sleep" operation is required.The LTC1155 is available in both 8-pin PDIP and 8-pin SO packages.APPLICATIONSLaptop Power Bus SwitchingSCSI Termination Power SwitchingCellular Phone Power ManagementP-Channel Switch ReplacementRelay and Solenoid DriversLow Frequency Half H-BridgeMotor Speed and Torque Control

The LTC1164-5 is a monolithic 8th order filter; it approximates either a Butterworth or a Bessel lowpass response. The LTC1164-5 features clock-tunable cutoff frequency and low power consumption (4.5mA with ±5V supplies and 2.5mA with single 5V supply).Low power operation is achieved without compromising noise or distortion performance. With ±5V supplies and 10kHz cutoff frequency, the operating signal-to-noise ratio is 86dB and the THD throughout the passband is 0.015%. Under the same conditions, a 77dB signal-to-noise ratio and distortion is obtained with a single 5V supply while the clock feed through is kept below the noise level. The maximum signal-to-noise ratio is 92dB.The LTC1164-5 approximates an 8th order Butterworth response with a clock-to-cutoff frequency ratio of 100:1 (Pin 10 to V–) or 50:1 double-sampled (Pin 10 to V+and Pin 1 shorted to Pin 13). Double-sampling allows the input signal frequency to reach the clock frequency before any aliasing occurrence. An 8th order Bessel response can also be approximated with a clock-to-cutoff frequency ratio of 140:1 (Pin 10 to ground). With ±7.5V supply, ±5V supply and single 5V supply, the maximum clock frequency of the LTC1164-5 is 1.5MHz, 1MHz and 1MHz respectively. The LTC1164-5 is pin-compatible with the LTC1064-2 and LTC-1064-3.ApplicationsAnti-Aliasing FiltersBattery-Operated InstrumentsTelecommunications FiltersSmoothing Filters

The LTC1164-6 is a monolithic 8th order elliptic lowpass filter featuring clock-tunable cutoff frequency and low power supply current. Low power operation is achieved without compromising noise or distortion performance. At ±5V supplies the LTC1164-6 uses only 4mA supply current while keeping wideband noise below 110µVRMS. With a single 5V supply, the LTC1164-6 can provide up to 10kHz cutoff frequency and 80dB signal-to-noise ratio while consuming only 2.5mA.The LTC1164-6 provides an elliptic lowpass rolloff with stopband attenuation of 64dB at 1.44 fCUTOFFand an fCLK-to- fCUTOFFratio of 100:1 (Pin10 to V–). For a ratio of 100:1, fCUTOFFcan be clock-tuned up to 10kHz. For a fCLK-to-fCUTOFFratio of 50:1 (Pin 10 to V+), the LTC1164-6 provides an elliptic lowpass filter with fCUTOFFfrequencies up to 20kHz. When Pin 10 is connected to ground, the LTC1164-6 approximates an 8th order linear phase response with 65dB attenuation at 4.5 f–3dBand fCLK/f–3dBratio of 160:1. The LTC1164-6 is pin compatible with the LTC1064-1.ApplicationsAntialiasing FiltersBattery-Operated InstrumentsTelecommunication Filters

The LTC1164-7 is a low power, clock-tunable monolithic 8th order lowpass filter with linear passband phase and flat group delay. The amplitude response approximates a maximally flat passband and exhibits steeper roll-off than an equivalent 8th order Bessel filter. For instance, at twice the cutoff frequency the filter attains 34dB attenuation (vs12dB for Bessel), while at three times the cutoff frequency the filter attains 68dB attenuation (vs 30dB for Bessel). The cutoff frequency of the LTC1164-7 is tuned via an external TTL or CMOS clock.Low power is achieved without sacrificing dynamic range. With single 5V supply, the S/N + THD is up to 75dB. Optimum 91dB S/N is obtained with ±7.5V supplies.The clock-to-cutoff frequency ratio of the LTC1164-7 can be set to 50:1 (pin 10 to V+) or 100:1 (pin 10 to V–).When the filter operates at the clock-to-cutoff frequency ratio of 50:1, the input is double-sampled to lower the risk of aliasing.The LTC1164-7 is pin-compatible with the LTC1064-X series and LTC1264-7.ApplicationsData Communication FiltersTime Delay NetworksPhase Matched Filters