Features and Benefits
- Pin-Compatible TxDAC Product Family
- 28-lead SOIC, 28-lead TSSOP, and 32-LFCSP Packages
- Excellent SFDR performance
- SNR @ 5 MHz Output, 125 MSPS: 70 dB
- Twos Complement or Straight
Binary Data Format
- Power Dissipation: 135 mW at
3.3 V (Power-Down Mode: 15 mW)
- On-Chip 1.20 V Reference
The AD9742 is the 12-bit member of the new third generation family in the TxDAC product line. This new family includes the AD9744 (14-bit), AD9742 (12-bit), and AD9740 (10-bit) high-speed TxDAC converters with a maximum sampling rate of 210 MSPS. The family is pin-compatible with the previous two generations (AD9764/AD9762/AD9760 and AD9754/AD9752/AD9750) with improved performance and lower power dissipation.
The TxDAC product line is optimized for the transmit signal path of communications systems. All of the devices, including the first two generations, share the same interface options, small outline package and pinout, providing an upward or downward component selection path based on performance, resolution, and cost. The AD974x family has lower power dissipation than previous generations, making all three converters suitable for portable and low power applications.
TxDAC is a registered trademark of Analog Devices.
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
The AD9740ACP-PCBZ/AD9742ACP-PCBZ/AD9744ACP-PCBZ/AD9748ACP-PCBZ evaluation board allows users to easily set up and test the 32-lead lead frame chip scale package (LFCSP) of the AD9740, AD9742, AD9744, and AD9748 devices. Paying careful attention to layout and circuit design, combined with a prototyping area, allows the user to effectively evaluate the AD9740, AD9742, AD9744, and AD9748 in applications that require high resolution and high speed conversion.
The AD9740ACP-PCBZ/AD9742ACP-PCBZ/AD9744ACP-PCBZ/AD9748ACP-PCBZ evaluation board provide flexibility to operate the AD9740, AD9742, AD9744, and AD9748 in various configurations. Possible output configurations include transformer coupled, resistor terminated, and single and differential outputs. The digital inputs are driven from various word generators, and an on-board option can add a resistor network for proper load termination. Users can use the power-down feature of the AD9740, AD9742, AD9744, and AD9748 and can select clock and data modes.
The AD9740, AD9742, AD9744, and AD9748 are wideband, 3G members of the TxDAC® series of high performance, low power CMOS, digital-to-analog converters (DACs). The TxDAC family, consisting of pin-compatible 14-, 12-, 10-, and 8-bit DACs, is specifically optimized for the transmit signal path of communication systems. All the devices share the same interface options, small outline package, and pinout. The AD9740, AD9742, AD9744, and AD9748 also provide an upward or downward component selection path based on performance, resolution, and financial cost. The AD9740, AD9742, AD9744, and AD9748 offer exceptional ac and dc performance while supporting update rates up to 210 MSPS.
The low power dissipation of the AD9740, AD9742, AD9744, and AD9748 makes these devices well suited for portable and low power applications. Lowering the full-scale output current further reduces the power dissipation to 60 mW, with only a slight degradation in performance. Power-down mode also reduces the standby power dissipation to approximately 15 mW. A segmented current source architecture is combined with a proprietary switching technique to reduce spurious components and enhance dynamic performance. Edge triggered input latches and a 1.2 V temperature compensated band gap reference are integrated to provide a complete, monolithic DAC solution. The digital inputs support 3 V logic families.
For more information about the AD9740, AD9742, AD9744, and AD9748, refer to the corresponding data sheets. Consult the data sheets in conjunction with this user guide when using the AD9740ACP-PCBZ/AD9742ACP-PCBZ/AD9744ACP-PCBZ/AD9748ACP-PCBZ evaluation board.
Features & Benefits
- High performance member of pin-compatible TxDAC product family
- Excellent SFDR performance
- Twos complement or straight binary data format
- Differential current outputs: 2 mA to 20 mA
- Power dissipation: 135 mW at 3.3 V
- Power-down mode: 15 mW at 3.3 V
- On-chip 1.2 V reference
- CMOS-compatible digital interface
- 32-lead LFCSP package
- Edge triggered latches
Application Notes (6)
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
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.