AD9225

Features:

Monolithic 12-Bit, 25 MSPS A/D Converter
Low Power Dissipation: 280 mW
Single +5 V Supply
No Missing Codes Guaranteed
Differential Nonlinearity Error: 60.4 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




Pinout






Specifications



AVDD AVSS 0.3 +6.5 V
DRVDD DRVSS 0.3 +6.5V
AVSSDRVSS 0.3 +0.3 V
AVDD DRVDD 6.5 +6.5V
REFCOMAVSS 0.3 +0.3V
CLK AVSS 0.3 AVDD + 0.3 V
Digital Outputs DRVSS0.3 DRVDD + 0.3 V
VINA, VINB AVSS 0.3 AVDD + 0.3V
VREF AVSS0.3 AVDD + 0.3 V




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 a truly differential input structure, the user can select a variety of input ranges and offsets including single-ended applications. The dynamic performance is excellent. The sample-and-hold (SHA) amplifier is well suited for both multiplexed systems that switch full-scale voltage levels in successive channels and sampling single-channel inputs at frequencies up to and well beyond the Nyquist rate. The AD9225's wideband input combined with the power and cost savings over previously available monolithics, is suitable for applications in communications, imaging and medical ultrasound. The AD9225 has an onboard programmable reference. An external reference can also be chosen to suit the dc accuracy and temperature drift requirements of the application.