AD9640:  14-Bit, 80/105/125/150 MSPS, 1.8 V Dual Analog-to-Digital Converter

The AD9640 is a dual 14-bit, 80/105/125/150 MSPS analog-to-digital converter (ADC). The AD9640 is designed to support communications applications where low cost, small size, and versatility are ...More

To drive this ADC in DC-coupled applications, we suggest ADA4937-1 or ADA4938-1. To drive this ADC in AC-coupled applications, we suggest AD8352. To drive this ADC with an IF VGA, we suggest AD8376 or AD8372.

AD9640:  14-Bit, 80/105/125/150 MSPS, 1.8 V Dual Analog-to-Digital Converter

Product Description

The AD9640 is a dual 14-bit, 80/105/125/150 MSPS analog-to-digital converter (ADC). The AD9640 is designed to support communications applications where low cost, small size, and versatility are desired.

The dual ADC core features a multistage, differential pipelined architecture with integrated output error correction logic. Each ADC features wide bandwidth differential sample-and-hold analog input amplifiers supporting a variety of user-selectable input ranges. An integrated voltage reference eases design considerations. A duty cycle stabilizer is provided to compen-sate for variations in the ADC clock duty cycle, allowing the converters to maintain excellent performance.

The AD9640 has several functions that simplify the automatic gain control (AGC) function in the system receiver. The fast detect feature allows fast overrange detection by outputting four bits of input level information with very short latency.

In addition, the programmable threshold detector allows moni-toring of the incoming signal power using the four fast detect bits of the ADC with very low latency. If the input signal level exceeds the programmable threshold, the fine upper threshold indicator goes high. Because this threshold is set from the four MSBs, the user can quickly turn down the system gain to avoid an overrange condition.

The second AGC-related function is the signal monitor. This block allows the user to monitor the composite magnitude of the incoming signal, which aids in setting the gain to optimize the dynamic range of the overall system.

The ADC output data can be routed directly to the two external 14-bit output ports. These outputs can be set from 1.8 V to 3.3 V CMOS or 1.8 V LVDS.

Flexible power-down options allow significant power savings, when desired.

Programming for setup and control is accomplished using a 3-bit SPI-compatible serial interface.

The AD9640 is available in a 64-lead LFCSP and is specified over the industrial temperature range of −40°C to +85°C.

Product Highlights

  1. Integrated dual 14-bit, 80/105/125/150 MSPS ADC.
  2. Fast overrange detect and signal monitor with serial output.
  3. Signal monitor block with dedicated serial output mode.
  4. Proprietary differential input that maintains excellent SNR performance for input frequencies up to 450 MHz.
  5. Operation from a single 1.8 V supply and a separate digital output driver supply to accommodate 1.8 V to 3.3 V logic families.
  6. A standard serial port interface that 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.
  7. Pin compatibility with the AD9627, AD9627-11, and the AD9600 for a simple migration from 14 bits to 12 bits, 11 bits, or 10 bits.

Applications

  • Communications
  • Diversity radio systems
  • Multimode digital receivers
    GSM, EDGE, WCDMA, LTE,
    CDMA2000, WiMAX, TD-SCDMA
  • I/Q demodulation systems
  • Smart antenna systems
  • General-purpose software radios
  • Broadband data applications

Features

  • SNR = 71.8 dBc (72.8 dBFS) to 70 MHz @ 125 MSPS
  • SFDR = 85 dBc to 70 MHz @ 125 MSPS
  • Low power: 750 mW @ 125 MSPS
  • SNR = 71.6 dBc (72.6 dBFS) to 70 MHz @ 150 MSPS
  • SFDR = 84 dBc to 70 MHz @ 150 MSPS
  • Low power: 820 mW @ 150 MSPS
  • 1.8 V analog supply operation
  • Please see data sheet for additional information.
Circuits from the Lab

Find more at our Circuits Library.

Products Used in This Circuit:
AD9640, ADL5534

Circuit Types:  ADC Circuit/Driver
Applications:  Communications
Optimized For:  High Performance; High Speed; Low Noise and Distortion

Diagrams

AD9640 Diagram
Functional Block Diagram for AD9640

Specifications

Resolution (Bits) 14bit
T-Put Rate 150MSPS
# Chan 2
Supply V Multi(+1.8Anlg, +1.8Dig),Multi(+1.8Anlg, +3.3Dig)
Pwr Diss 938mW
Interface Par
Ain Range 1 V p-p,2 V p-p
SNR (dB) 71.9dB
Pkg Type CSP

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Part# Bits Throughput Rate # of Inputs Operating Pwr Diss
AD9640-150 14 150MSPS 2 938mW
AD9254 14 150MSPS 1 470mW
AD9627-150 12 150MSPS 2 890mW
AD9600-150 10 150MSPS 2 890mW
AD9627-11-150 11 150MSPS 2 890mW
AD9251-80 14 80MSPS 2 232mW
AD9640-80 14 80MSPS 2 492mW
AD9248-65 14 65MSPS 2 700mW
AD9251-20 14 20MSPS 2 95mW
AD9248-20 14 20MSPS 2 217mW
AD7357 14 4.25MSPS 2 36mW
Pricing, Packaging & Availability

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  • Commercial: 0 to +70 degrees Celsius
  • Military : -55 to +125 degrees Celsius
  • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
  • Automotive: -40 to +125 degrees Celsius
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*The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

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