ADC-207

® ® ADC-207 7-Bit, 20MHz, CMOS Flash A/D Converters IN N O VA T IO N a n d E X C E L L E N C E FEATURES 7-bit flash A/D converter 20MHz sampling rate Low power (250mW) Single +5V supply 1.2 micron CMOS technology 7-bit latched 3-state output with overflow bit Surface-mount versions High-reliability version No missing codes GENERAL DESCRIPTION The ADC-207 is the industry’s first 7-bit flash converter using an advanced high-speed VLSI 1.2 micron CMOS process. This process offers some very distinctive advantages over other processes, making the ADC-207 unique. The smaller geometrics of the process achieve high speed, better linearity and superior temperature performance. Since the ADC-207 is a CMOS device, it also has very low power consumption (250mW). The device draws power from a single +5V supply and is conservatively rated for 20MHz operation. The ADC-207 allows using sampling apertures as small as 12ns, making it more closely approach an ideal sampler. The small sampling apertures also let the device operate at greater than 20MHz. The ADC-207 has 128 comparators which are auto-balanced on every conversion to cancel out any offsets due to temperature and/or dynamic effects. The resistor ladder has a midpoint tap for use with an external voltage source to improve integral linearity beyond 7 bits. The ADC-207 also provides the user with 3-state outputs for easy interfacing to other components. There are six models of the ADC-207 covering two operating t...