Complete 14-Bit, 10 MSPS Monolithic A/D Converter

The AD9240 is a 10 MSPS, single supply, 14-bit analog-to- digital converter (ADC). It combines a low cost, high speed CMOS process and a novel architecture to achieve the resolution and speed of existing hybrid implementations at a fraction of the power consumption and cost. It is a complete, monolithic ADC with an on-chip, high performance, low noise sample-and-hold amplifier and programmable voltage reference. An external reference can also be chosen to suit the dc accuracy and temperature drift requirements of the application. The device uses a multistage differential pipelined architecture with digital output error correction logic to guarantee no missing codes over the full operating temperature range.

The input of the AD9240 is highly flexible, allowing for easy interfacing to imaging, communications, medical and data-acquisition systems. A truly differential input structure allows for both single-ended and differential input interfaces of varying input spans. The sample-and-hold amplifier (SHA) is equally suited for multiplexed systems that switch full-scale voltage levels in successive channels as well as sampling single-channel inputs at frequencies up to and beyond the Nyquist rate. The AD9240 also performs well in communication systems employing Direct-IF Down Conversion, since the SHA in the differential input mode can achieve excellent dynamic performance well beyond its specified Nyquist frequency of 5 MHz.

A single clock input is used to control all internal conversion cycles. The digital output data is presented in straight binary output format. An out-of-range (OTR) signal indicates an overflow condition which can be used with the most significant bit to determine low or high overflow.

PRODUCT HIGHLIGHTS

The AD9240 offers a complete single-chip sampling 14-bit, analog-to-digital conversion function in a 44-lead Metric Quad Flatpack.

* Low Power and Single Supply

The AD9240 consumes only 280 mW on a single +5 V power supply.

* Excellent DC Performance Over Temperature

The AD9240 provides no missing codes, and excellent temperature drift performance over the full operating temperature range.

* Excellent AC Performance and Low Noise

The AD9240 provides nearly 13 ENOB performance and has an input referred noise of 0.36 LSB rms.

* Flexible Analog Input Range

The versatile onboard sample-and-hold (SHA) can be configured for either single ended or differential inputs of varying input spans.

* Flexible Digital Outputs

The digital outputs can be configured to interface with +3 V and +5 V CMOS logic families.

* Excellent Undersampling Performance

The full power bandwidth and dynamic range of the AD9240 make it well suited for Direct-IF Down Conversion extending to 45 MHz.

* Low Power Dissipation: 285 mW

* Single +5 V Supply

* Integral Nonlinearity Error: 2.5 LSB

* Differential Nonlinearity Error: 0.6 LSB

* Input Referred Noise: 0.36 LSB

* On-Chip Sample-and-Hold Amplifier and Voltage Reference