Analog Devices

The LT11186F is a fixed frequency, current mode, switching regulator that provides the control function for Cold Cathode Fluorescent Lighting (CCFL). The IC includes an efficient high current switch, an oscillator, output drive logic, control circuitry and a micropower 8-bit 50µA full-scale current output DAC. The DAC provides simple "bits-to-lamp current control" and communicates in two interface modes including standard SPI mode and pulse mode. On power-up, the DAC counter resets to half-scale and the DAC configures to SPI or pulse mode depending on theCSsignal level. In SPI mode, the system microprocessor serially transfers the present 8-bit data and reads back the previous 8-bit data. In pulse mode, the upper six bits of the DAC configure as increment-only (1-wire interface) or increment/decrement (2-wire interface) operation depending on the DINsignal level.The LT1186F control circuitry operates from a logic supply voltage of 3.3V or 5V. The IC also has a battery supply voltage pin that operates from 4.5V to 30V. The LT1186F draws 6mA typical quiescent current. An active low shutdown pin reduces total supply current to 35µA for standby operation and the DAC retains its last setting. A 200kHz switching frequency minimizes magnetic component size. Current mode switching techniques with cycle-by-cycle limiting gives high reliability and simple loop frequency compensation. The LT1186F is available in a 16-pin narrow SO package.ApplicationsNotebook and Palmtop ComputersPortable InstrumentsRetail Terminals

The LT1187 is a difference amplifier optimized for operation on ±5V, or a single 5V supply and gain ≥2. This versatile amplifier features uncommitted high input impedance (+) and (–) inputs, and can be used in differential or single-ended configurations. Additionally, a second set of inputs give gain adjustment and DC control to the difference amplifier.The LT1187’s high slew rate, 165V/μs, wide bandwidth, 50MHz, and ±20mA output current require only 13mA of supply current. The shutdown feature reduces the power dissipation to a mere 15mW and allows multiple amplifiers to drive the same cable.The LT1187 is a low power version of the popular LT1193, and is available in 8-pin miniDIPs and SO packages. For applications with gains of 10 or more, see the LT1189 data sheet.ApplicationsLine ReceiversVideo Signal ProcessingCable DriversTape and Disc Drive Systems

The LT1189 is a difference amplifier optimized for operation on ±5V, or a single 5V supply, and gain ≥10. This versatile amplifier features uncommitted high input impedance (+) and (–) inputs, and can be used in differential or single-ended configurations. Additionally, a second set of inputs give gain adjustment and DC control to the difference amplifier.The LT1189’s high slew rate, 220V/µs, wide bandwidth, 35MHz, and ±20mA output current require only 13mA of supply current. The shutdown feature reduces the power dissipation to a mere 15mW, and allows multiple ers to drive the same cable.The LT1189 is a low power, gain of 10 stable version of the popular LT1193, and is available in 8-pin mini DIPs and SO packages. For lower gain applications see the LT1187 data sheet.ApplicationsLine ReceiversVideo Signal ProcessingCable DriversTape and Disc Drive Systems

The LT1193 is a video difference amplifier optimized for operation on ±5V and a single 5V supply. This versatile amplifier features uncommitted high input impedance (+) and (–) inputs, and can be used in differential or single ended configurations. Additionally, a second set of inputs give gain adjustment and DC control to the differential amplifier.The LT1193’s high slew rate, 500V/µs, wide bandwidth, 80MHz, and ±50mA output current make it ideal for driving cables directly. The shutdown feature reduces the power dissipation to a mere 15mW and allows multiple amplifiers to drive the same cable.The LT1193 is available in 8-pin PDIP and SO packages.ApplicationsLine ReceiversVideo Signal ProcessingCable DriversOscillatorsTape and Disc Drive Systems

The LT1203 is a wideband 2-input video multiplexer designed for pixel switching and broadcast quality routing. The LT1205 is a dual version that is configured as a 4-input, 2-output multiplexer.These multiplexers act as SPDT video switches with 10ns transition times at toggle rates up to 30MHz. The −3dB bandwidth is 150MHz and 0.1dB gain flatness is 30MHz. Many parts can be tied together at their outputs by using the enable feature which reduces the power dissipation and raises the output impedance to 10MΩ. Output capacitance when disabled is only 3pF and the LT1203 peaks less than 3dB into a 50pF load. Channel crosstalk and disable isolation are greater than 90dB up to 10MHz. An on-chip buffer interfaces to fast TTL or CMOS logic. Switching transients are only 50mV with a 25ns duration. The LT1203 and LT1205 outputs are protected against shorts to ground.The LT1203/LT1205 are manufactured using LTCs proprietary complementary bipolar process. The LT1203 is available in both the 8-lead PDIP and SO package while the LT1205 is available in the 16-lead narrow body SO package.ApplicationsBroadcast Quality Video MultiplexingPicture-in-Picture SwitchingComputer GraphicsTitle GenerationVideo Crosspoint MatricesVideo Routers

The LT1204 is a 4-input video multiplexer designed to drive 75Ω cables and easily expand into larger routing systems. Wide bandwidth, high slew rate, and low differential gain and phase make the LT1204 ideal for broadcast quality signal routing. Channel separation and disable isolation are greater than 90dB up to 10MHz. The channel-to-channel output switching transient is only 40mVP-P, with a 50ns duration, making the transition imperceptible on high quality monitors.A unique feature of the LT1204 is its ability to expand into larger routing matrices. This is accomplished by a patent pending circuit that bootstraps the feedback resistors in the disable condition, raising the true output impedance of the circuit. The effect of this feature is to eliminate cable misterminations in large systems.The large input and output signal levels supported by the LT1204 when operated on ±15V supplies make it ideal for general purpose analog signal selection and multiplexing. A shutdown feature reduces the supply current to 1.5mA.ApplicationsBroadcast Quality Video MultiplexingLarge Matrix RoutingMedical ImagingLarge Amplitude Signal MultiplexingProgrammable Gain Amplifiers