Texas Instruments' has fleshed out its 12 and 14bit analog-to-digital converter (ADC) portfolio with six devices that boast sampling rates up to 250Msample/s. Catering to wide bandwidth, high accuracy applications such as radar or high speed test and measurement equipment, these devices result in better range and sensitivity than prior solutions. These also boast low power consumption, now an important consideration even in these applications, enabling more efficient power amplifier linearisation in digital pre-distortion solutions.
The 14bit ADS6149, TI says, is the highest resolution 250Msample/s ADC in production. This device boasts a 70dB signal-to-noise ratio (SNR) and 80dB spurious-free dynamic range (SFDR) for input frequencies ranging from DC to 250 MHz. It consumes 687mW at the maximum sample rate and 490mW when sampling at 150Msample/s.
The ADS6149 is available with a fully differential buffered input (ADS61B49) or without. The buffer provides constant input impedance over input frequency and is said to eliminate kickback from the ADC's track-and-hold circuit to ensure consistent signal linearity.
The ADS61xx family comprises 12 and 14bit devices with user-selectable parallel CMOS or differential double data rate LVDS output options. The ADS6149 and ADS6129 are already available in 7 x 7mm, 48pin QFN packages, whilst the remaining four pin-compatible members of the ADS61xx family will be available shortly.