AD9225

FEATURES Monolithic 12-Bit, 25 MSPS ADC Low Power Dissipation: 280 mW Single 5 V Supply No Missing Codes Guaranteed Differential Nonlinearity Error: ؎0.4 LSB Complete On-Chip Sample-and-Hold Amplifier and Voltage Reference Signal-to-Noise and Distortion Ratio: 71 dB Spurious-Free Dynamic Range: –85 dB Out-of-Range Indicator Straight Binary Output Data 28-Lead SOIC 28-Lead SSOP Compatible with 3 V Logic Complete 12-Bit, 25 MSPS Monolithic A/D Converter AD9225 FUNCTIONAL BLOCK DIAGRAM VINA VINB CAPT CAPB VREF SENSE SHA CLK AVDD DRVDD MDAC1 GAIN = 16 5 ADC 5 MDAC2 GAIN = 4 MDAC3 GAIN = 4 3 ADC ADC 3 33 DIGITAL CORRECTION LOGIC 12 OUTPUT BUFFERS ADC 4 MODE SELECT 1V REFCOM AVSS AD9225 DRVSS CML OTR BIT 1 (MSB) BIT 12 (LSB) GENERAL DESCRIPTION The AD9225 is a monolithic, single-supply, 12-bit, 25 MSPS analog-to-digital converter with an on-chip, high performance sample-and-hold amplifier and voltage reference. The AD9225 uses a multistage differential pipelined architecture with output error correction logic to provide 12-bit accuracy at 25 MSPS data rates, and guarantees no missing codes over the full operating temperature range. The AD9225 combines a low cost, high speed CMOS process and a novel architecture to achieve the resolution and speed of existing bipolar implementations at a fraction of the power consumption and cost. The input of the AD9225 allows for easy interfacing to both imaging and communications systems. With the device’s truly differential ...