Hittite has introduced three new ADCs that are ideal for digital storage oscilloscopes (DSOs). Their combination of low power and high sample rate yields a solution for 1 GSps, USB powered oscilloscopes.
The HMCAD1520, HMCAD1511 and HMCAD1510 feature integrated functions specifically for DSO applications. Integrated crosspoint switches allow switching between quad-, dual- and single-channel modes, while integrated 1x to 8x clock dividers keep the input clock frequency constant when the number of channels is changed.
The HMCAD1511 features 8-bit resolution at 1 GSps sample rate. A 13-bit internal resolution allows up to 32x (30 dB) digital gain without missing codes, allowing the user to replace analog gain circuitry with digital gain settings. At 1 GSps the chip consumes 710 mW. By interleaving two or four HMCAD1511s, overall sample rates of 2 or 4 GSps can be achieved.
The HMCAD1520 provides up to 12-bit resolution at up to 640 MSps, making it suitable for precision DSOs. The HMCAD1511 is available as an operational mode for the HMCAD1520, allowing combined 12-bit and 8-bit implementations. The HMCAD1510 features 8-bit resolution up to 500 MSps and consumes just 295 mW, making it suitable for handheld, battery powered instruments.
All three ADCs can be evaluated with the Hittite EasySuite evaluation kits – EKIT01-AD1520, EKIT-AD1511 and EKIT-AD1510. The kits are based on Xilinx FMC (FPGA mezzanine card) SP601 standard motherboards, and feature Hittite evaluation boards with onboard ADCs connected to the Xilinx board through an FMC connector. Hittite’s pre-loaded EasyStack firmware performs FPGA processing, while the EasySuite PC software tool performs ADC configuration, data capture and performance analysis.
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