National Semiconductor releases the ADC10D1000

National Semiconductor has introduced a 2.5 GHz fully differential amplifier and a 10 bit, 2 Giga sample per second (GSPS) single/1 GSPS dual analogue-to-digital converter (ADC).

These combined signal path products are suited for ground-based radar, data acquisition systems, point-to-point base stations and set-top boxes.

At a frequency of 248 MHz, the ADC10D1000 provides a spurious-free dynamic range (SFDR) performance of 66 decibels relative to carrier (dBc) and 9.1 effective number of bits (ENOB).

Running off a single supply voltage, the ADC10D1000 achieves this while consuming 33 per cent less total power (2.8W) than comparable ADCs.

The 2.5 GHz LMH6554 wideband fully differential amplifier drives the 10-bit ADC10D1000, providing 0.1 dB gain flatness up to 800 MHz, SFDR of 72 dBc at 250 MHz and leading low-input voltage noise performance of 0.9 nV/sqrt Hz.

The ADC10D1000 yields 2.52 picojoules (pJ) per conversion, while the LMH6554 consumes 21 uA per MHz.

The ADC10D1000's SFDR and ENOB allow it to maintain excellent performance through the first, second and third Nyquist zones.

The ADC10D1000 enables digitisation of wide swaths of bandwidth in applications that previously had to use narrowband ADCs to achieve high-resolution sampling.

For example, high-resolution radar systems can now use fewer parallel channels to digitise the same bandwidth, reducing board size and power dissipation.

The ADC10D1000's 2.8W power consumption also enables system design without heat sinks over the -40C to 85C industrial temperature range, saving space and weight.

The ADC10D1000 digitises a pair of analogue input signals at sampling rates up to 1 GSPS, or a single analogue input signal at speeds up to two GSPS.

Additional features include Autosync for multi-chip synchronisation and programmable gain and offset adjustment for each channel.

The internal track-and-hold amplifier and the extended self-calibration scheme enable a flat response of all dynamic parameters beyond Nyquist, while providing a low 10 (-18) code error rate.

The ADC10D1000 is supplied in a leaded or lead-free, 292-ball, thermally enhanced BGA package.

The LMH6554 is a 2.5 GHz differential amplifier that provides exceptional signal fidelity for driving eight to 16 bit high speed ADCs.

The device's low impedance differential output drives ADC inputs and any intermediate filter stage.

The LMH6554 delivers 16-bit linearity up to 75 MHz when driving 2V peak-to-peak into loads as low as 200-Ohms.

The LMH6554 has external gain set resistors and integrated common-mode feedback.

It can be used in differential-to-differential or single-ended-to-differential configurations.

The amplifier provides large signal bandwidth up to 1.8 GHz, 8 dB noise figure and a slew rate of 6200 V/us.

The LMH6554 is manufactured on National's CBC8 silicon germanium (SiGe) complementary bipolar-CMOS process technology.

The CBC8 process features a monolithic, combination of SiGe NPN and PNP transistors and low power CMOS transistors that enable exceptional speed, linearity, circuit density, low power and low noise for demanding high speed analogue applications.

The LMH6554 operates between -40C and 125C and is supplied in a space-saving, thermally enhanced, 14-pin flip-chip on lead (FCOL) package.

A reference board that includes the ADC10D1000, LMX2531 clock source and a field-programmable gate array (FPGA) interfaces directly with National's new Wavevision 5 software to simplify the evaluation process.

The Wavevision 5 system is an easy-to-use analysis tool designed to help users evaluate National's signal path products.

For example, the ADC10D1000 can be teamed with the LMH6554 amplifier as well as the LMX2531 single-chip phase-locked loop (PLL) and voltage-controlled oscillator (VCO) or one of National's LMK04000 family of clock jitter cleaners to form a signal path.

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