Eight-bit ADC achieves high linearity at 250 Msps
Analog Devices' new eight-bit analog-to-digital converter (ADC) achieves a conversion rate of 250 Msps while maintaining a differential nonlinearity (DNL) of +/- 0.25 LSB. DNL is critical in providing accurate displays of small input signals for applications such as digital oscilloscopes and network analyzers. The device also is suited for applications that require high sample rates and high bandwidth, such as point-to-point backhaul radios and power amplifier (PA) digital pre-distortion subsystems in cellular base stations.
The AD9480 offers legacy support for demultiplexed TTL/CMOS output logic, as well as LVDS (low-voltage differential signaling) outputs, to accommodate both existing and next-generation digital ASICs (application-specific integrated circuits). In CMOS demultiplexed mode, the new ADC moves data through two eight-bit channels at one-half the clock rate in either interleaved or parallel mode. When operating in LVDS mode, the AD9480 pipes data at the full clock rate through a single output channel for maximum output performance.
In addition to easing design concerns through its support of LVDS outputs, the eight-bit AD9480 ADC achieves a 46.4 dB SNR (signal-to-noise ratio) and no missing codes. The ADC also guarantees +/-0.35 LSB DNL over the entire industrial temperature range of -40 degrees C to +85 degrees C. The converter operates from a 3.3-V power supply and includes an internal reference and track-and-hold circuit. Featuring a similar pin configuration to Analog Devices' AD9054A high-speed ADC, the AD9480 lowers system development costs by allowing designers to upgrade their products through a simple board modification.
The AD9480 is sampling now in a 44-pin TQFP (thin quad flat pack) and is priced at $24.20 per unit in 1000-piece quantities.
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