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

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 ...More

To drive this ADC in DC-coupled applications, we suggest ADA4938-1. To drive this ADC in AC-coupled applications, we suggest AD8352 or AD8375.

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

Product 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.

Applications

  • Ultrasound equipment
  • IF sampling in communications receivers IS-95, CDMA-One, IMT-2000
  • Battery-powered instruments
  • Hand-held scopemeters
  • Low cost digital oscilloscopes

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
  • Data output clock and clock duty cycle stabilizer
  • Serial port control
    - Built-in selectable digital test pattern generation
    - Programmable clock and data alignment

Verified Circuits Using This Part

Verified Circuits are designed for ease of use and proven to work by ADI applications engineers. To learn more about Verified Circuits from ADI, please visit Verified Circuits Home.

Circuit Diagram

Diagrams

AD9246 Diagram
Functional Block Diagram for AD9246

Specifications

Resolution (Bits) 14bit
T-Put Rate 125MSPS
# Chan 1
Supply V Multi(+1.8Anlg, +1.8Dig)
Pwr Diss (max) 458mW
Interface Par
Ain Range (2Vref) p-p,1 V p-p,2 V p-p
SNR (dB) 71.9dB
Pkg Type CSP

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Part# Res Throughput Rate # of Inputs Operating Pwr Diss
AD9246-125 14 125MSPS 1 458mW
AD9626-170 12 170MSPS 1 291mW
AD9233-125 12 125MSPS 1 425mW
AD9626-250 12 250MSPS 1 390mW
AD9230-170 12 170MSPS 1 407mW
AD9211-200 10 200MSPS 1 356mW