The 13700 is a dual operational transconductance amplifier with linearising diodes & buffers. It consists of two current controlled transconductance amplifiers each with different inputs & a push pull output. The two amplifiers share common supplies but otherwise operate independently. Linearising diodes are provided at the inputs to reduce distortion & allow higher input levels. The result is a 10d B signal-to-noise improvement referenced to 0.5 THD. High impedance buffers are provided which are specially designed to complement the dynamic range of the amplifiers. The IC has many useful applications such as voltage controlled amplifiers voltage controlled resistors voltage controlled filters voltage controlled oscillators phase locked loop Schmitt trigger tachometer f to v peak detector & hold sample & hold ramp & hold true RMS convertor variable temperature coefficient voltage reference pulse width modulator log current source multiplexer zero standby power timer four quadrant multiplier amplitude monitor & stereo volume control. A data sheet is available which shows circuit details of all the above applications. Absolute max ratings LM13700 N Voltage supply rangeplusmn 2V to plusmn 18 V Power dissipation 570m W Differential input voltageplusmn 5VDiode bias current 2m A Amplifier bias current 2m A Typical ratings at 25 C with VS plusmn 15 V Input offset voltage 0.4m A Input offset current 100n A Input bias current 400n A Input resistance 26k Omega Forward transconductance gm 9600micro Omega Tracking of gm 0.3d B Peak output current 500micro A Peak output voltageplusmn 14 V Supply current per amp 1.3m A Common moderejection ratio 110d B Unity gain bandwidth 2MHz Full power bandwidth 200k Hz Slew rate 50 Vmicros ...

Extracts the timing information from PAL SECAM or NTSC encoded video signals having standard negative going sync & amplitudes from 0.5V to 2VIC outputs the composite sync vertical sync burstback porch timing & an odd even field identifier By changing the value of R2 non-standard faster horizontal rate video signals can also be stripped. The vertical sync output is produced on the rising edge of the first serration in the vertical sync period but if the rising edge does not occur within the internally set period a default vertical output is produced permitting use with video games & home computers. The IC can be used as a master gen-lock to provide timing references for the extraction of data on specific scan lines to restore the original video waveform for remodulation or retrieve the colour burst & decode into R.G.B. components or to identify individual scan lines in the video signal. Parts list ...

The 2577T is a step-up regulator device finding many applications in flyback & forward convertor switching regulation. A typical arrangement requires only a few external components to realise a working design. Using existing value inductors & flyback transformers simplifies circuit design. Output currents up to 3A are possible with this device from a wide range of input voltages 3.5V to 40V. Output voltages up to 60V can be developed depending on the output current required. Step-up is achieved using the internal 52k Hz fixed frequency oscillator & developing a voltage across an inductor or transformer. The current from the device charges the output capacitor & feedback maintains it at a constant voltage. A load can then be connected to the output which is regulated to the desired voltage. Other features of the device are a soft start mode internal protection against overcurrent limit thermal limiting & undervoltage lock-out. Applications include simple boost regulators flyback & forward regulators & multiple output regulators. ...

The 14-pin DIL IC is extremely easy to use since Vltsubgt OUTltsubgt Fltsubgt I Nltsubgt x Vltsubgt C Cltsubgt x VR1 x C2 where VR1 is the resistance between pin 3 & ground & C2 is the capacitance in Farads between pin 2 & ground. Features include ground referenced tachometer whose input interfaces directly with magnetic variable reluctance pick-ups op-amp comparator with floating relays solenoids meters or LEDs etc frequency doubling with low ripple tachometer with built-in hysteresis for either differential or ground referenced input built-in zener for accurate & stable frequency to current conversion & linearity typically plusmn 0.3. Applications include overunder speed sensing tachometers speedometers breaker point dwell meters h&-held tachometers speed governors cruise control touch or sound switches etc. ...

A positive voltage regulator that can source 1A of output current with a dropout voltage of typically 0.5V & a maximum of 1V over the entire temperature range. A quiescent current reduction circuit has been included which reduces the ground current when the differential between the input voltage & the output voltage exceeds Approx. 3V. The quiescent current with 1A of output current & an input-output differential of 5V is therefore only 3m A. Higher quiescent currents only exists when the regulator is in the dropout mode VIN
- VOUT 3V. Also designed for vehicular applications the device & all regulated circuitry is protected from reversed battery installation or double-battery jump-start scenarios. During line transients such as load dump where the input can temporarily exceed max. VIN the device will shut down to protect its internal circuits & the load. It cannot be harmed by temporary mirror-image insertion. Thermal overload & short-circuit protection is included. Specifications Output voltage 5V typical plusmn 0.15V max. Line regulation 20m V Load regulation 35m V Output impedance 35m W Quiescent current 10m A max. Output noise 150micro V rms Ripple rejection 72d B min. Long term stability 20m V1000 hrs Dropout voltage 0.5V min. Maximum input voltage 26 V Operating temperature range 0 C to 125 C
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- Output adjustable between 1.25V & 37V
- Internal thermal overload protection
- Internal short circuit current limiting


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- Output adjustable between 1.25V & 37V
- Internal thermal overload protection
- Internal short circuit current limiting


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- Output adjustable between 1.25V & 37V
- Internal thermal overload protection
- Internal short circuit current limiting


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Independent high-gain internally frequency compensated op-amps specifically intended to operate from a single power supply over a wide range of voltages. Application areas include transducer amplifiers DC gain blocks & all conventional op-amp circuits which are designed for single power supply systems. The device will work from standard 5V rails found in digital systems & provide the required interface electronics. in addition the device features a large DC voltage gain 100d B 1 M Hz unity gain bandwidth 120d B channel separation & class AB outputs with virtually no crossover distortion. The device will operate from a 3 to 32 Vdc rail or from a dual plusmn 1.5V to plusmn 16 Vdc supply. ...

This IC in a TO92 package is a 3-terminal adjustable current source with a 10000 to 1 range in operating current excellent current regulation & a wide dynamic voltage regulation of 1V to 40V. Current is established with one resistor connected between pins 1 R & 3 -V & no other parts are required. The current is equal to 0.0677V divided by the resistor in ohms i.e. for 1m A R 68andohm at 25C. Currents may be set in the range 1andmicro A to 10m A & regulation is 0.02 per volt. Initial current accuracy is andplusmn 3 typical. Reverse voltages of up to 20V will draw only a few microamps allowing the device to act as a rectifier & current source in AC applications. The current is also directly proportional to the temperature at the rate 0.33 per C. Zero drift operation can be obtained by adding one resistor & one diode. Applications include bias networks surge protection low power reference ramp generation LED driver & temperature sensing. ...