SUNNYVALE, Calif. Maxim Integrated Products touts the very low noise figure of its MAX104 8-bit, 1-Gsample/second analog-to-digital converter: a 46-dB Sinad (signal-to-noise ratio plus total harmonic distortion) at 1 GHz. Competing parts, said Maxim, typically attain a 42-dB Sinad. The device has a 2.2-GHz track-and-hold amplifier on-chip,which allows conversions at 1 Gsample/s.
The MAX104 has a 54-dB spurious-free dynamic range (SFDR), against 45 dB for competing parts. The extra headroom suits the device for digital oscilloscopes, radar systems, intermediate-frequency down converters and other fast data-acquisition systems, where wide bandwidth, good linearity and high dynamic performance are required.
The MAX104 achieves its full 47-dB Sinad and 54-dB SFDR at a 500-MHz input (Nyquist) frequency, and maintains them within 1 dB all the way out to 1 GHz. This makes an effective number of bits on the order of 7.5, which Maxim said is 0.3 bits higher than the competition.
The performance arises from both innovative design and a 27-GHz GST-2 bipolar process, said converter business manager Dave Bernel. The input track/hold uses Schottky diodes and laser-trimmed resistors to obtain integral and differential non-linearities less than plus/minus 0.3 least significant bit and aperture jitter less than 1 ps. The differential input has an analog bandwidth of 2.2 GHz, and the digital outputs are differential PECL.
The MAX104 uses a 25- x 25- x 1.2-mm, 192-contact Enhanced Super ball-grid array package to minimize the parasitic effects that come at ultrahigh frequencies. The package also provides controlled impedance signal paths, and serves as an effective heat sink in many applications.
To facilitate a digital interface, an on-chip, selectable 8:16 output demultiplexer slows the 1-Gsample/s data to 500 million words/s, ported to two parallel, differential 8-bit, low-voltage (PECL) outputs. Data is presented in offset binary format and includes an output clock and an over-range bit.
The device operates from plus/minus 5-V supplies and supports 3- to 5-V output interfaces. The MAX104 is priced from $398 each in lots of 1,000. An evaluation kit is available for $650.
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EETInfo No. 629