AD9246BCPZ-125 electronic devices and integrated circuits Integrated Circuit Chip Analog-to-Digital Converter

14-Bit, 80 MSPS/105 MSPS/125 MSPS, 1.8 V Analog-to-Digital Converter AD9246

FEATURES

1.8 V analog supply operation

1.8 V to 3.3 V output supply

SNR = 71.7 dBc (72.7 dBFS) to 70 MHz input

SFDR = 85 dBc to 70 MHz input

Low power: 395 mW @ 125 MSPS

Differential input with 650 MHz bandwidth

On-chip voltage reference and sample-and-hold amplifier

DNL = ±0.4 LSB

Flexible analog input: 1 V p-p to 2 V p-p range

Offset binary, Gray code, or twos complement data format

Clock duty cycle stabilizer

Data output clock

Serial port control

  Built-in selectable digital test pattern generation

  Programmable clock and data alignment

APPLICATIONS

Ultrasound equipment

IF sampling in communications receivers

  IS-95, CDMA-One, IMT-2000

Battery-powered instruments

Hand-held scopemeters

Low cost digital oscilloscopes

GENERAL DESCRIPTION

The AD9246 is a monolithic, single 1.8 V supply, 14-bit, 80 MSPS/ 105 MSPS/125 MSPS analog-to-digital converter (ADC), featuring a high performance sample-and-hold amplifier (SHA) and on-chip voltage reference. The product uses a multistage differential pipeline architecture with output error correction logic to provide 14-bit accuracy at 125 MSPS data rates and guarantees no missing codes over the full operating temperature range.

The wide bandwidth, truly differential SHA allows a variety of user-selectable input ranges and offsets, including single-ended applications. It is suitable for multiplexed systems that switch full-scale voltage levels in successive channels and for sampling single-channel inputs at frequencies well beyond the Nyquist rate. Combined with power and cost savings over previously available ADCs, the AD9246 is suitable for applications in communications, imaging, and medical ultrasound.

A differential clock input controls all internal conversion cycles. A duty cycle stabilizer (DCS) compensates for wide variations in the clock duty cycle while maintaining excellent overall ADC performance.

The digital output data is presented in offset binary, Gray code, or twos complement formats. A data output clock (DCO) is provided to ensure proper latch timing with receiving logic.

The AD9246 is available in a 48-lead LFCSP_VQ and is specified over the industrial temperature range (−40°C to +85°C).

PRODUCT HIGHLIGHTS

1. The AD9246 operates from a single 1.8 V power supply and features a separate digital output driver supply to accommodate 1.8 V to 3.3 V logic families.

2. The patented SHA input maintains excellent performance for input frequencies up to 225 MHz.

3. The clock DCS maintains overall ADC performance over a wide range of clock pulse widths.

4. A standard serial port interface supports various product features and functions, such as data formatting (offset binary, twos complement, or Gray coding), enabling the clock DCS, power-down, and voltage reference mode.

5. The AD9246 is pin-compatible with the AD9233, allowing a simple migration from 12 bits to 14 bits.

ABSOLUTE MAXIMUM RATINGS

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

FUNCTIONAL BLOCK DIAGRAM

OUTLINE DIMENSIONS

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