Analog Devices

The AD9743/AD9745/AD976/AD9747 are pin-compatible, high dynamic range, dual digital-to-analog converters (DACs) with 10-/12-/14-/16-bit resolutions and sample rates of up to 250 MSPS. The devices include specific features for direct conversion transmit applications, including gain and offset compensation, and they interface seamlessly with analog quadrature modulators, such as the ADL5370.A proprietary, dynamic output architecture permits synthesis of analog outputs even above Nyquist by shifting energy away from the fundamental and into the image frequency.A serial peripheral interface (SPI) port provides full programmability. In addition, some pin-programmable features are offered for those applications without a controller.Product HighlightsLow noise and intermodulation distortion (IMD) enables high quality synthesis of wideband signals.Proprietary switching output for enhanced dynamic performance.Programmable current outputs and dual auxiliary DACs provide flexibility and system enhancements.ApplicationsWireless infrastructure:W-CDMA, CDMA2000, TD-SCDMA, WiMAXWideband communications:LMDS/MMDS, point-to-pointInstrumentation:Radio Frequency (RF) signal generators, arbitrary waveform generators

The AD97481 is an 8-bit resolution, wideband, third generation member of the TxDAC series of high performance, low power CMOS digital-to-analog converters (DACs). The TxDAC family, consisting of pin-compatible 8-, 10-, 12-, and 14-bit DACs, is specifically optimized for the transmit signal path of communication systems. All of the devices 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 AD9748 offers exceptional ac and dc performance while supporting update rates up to 210 MSPS.The AD9748’s low power dissipation makes it well suited for portable and low power applications. Its power dissipation can be further reduced to 60 mW with a slight degradation in performance by lowering the full-scale current output. In addition, a power-down mode 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 have been integrated to provide a complete monolithic DAC solution. The digital inputs support 3 V CMOS logic families.PRODUCT HIGHLIGHTS32-lead LFCSP.The AD9748 is the 8-bit member of the pin-compatible TxDAC family, which offers excellent INL and DNL performance.Differential or single-ended clock input (LVPECL or CMOS), supports 210 MSPS conversion rate.Data input supports twos complement or straight binary data coding.Low power: Complete CMOS DAC function operates on 135 mW from a 2.7 V to 3.6 V single supply. The DAC full-scale current can be reduced for lower power operation, and a sleep mode is provided for low power idle periods.On-chip voltage reference: The AD9748 includes a 1.2 V temperature-compensated band gap voltage reference.APPLICATIONSCommunicationsDirect digital synthesis (DSS)Instrumentation

The AD9750 is a 10-bit resolution second generation member of the TxDAC series of high performance, low power CMOS digital-to-analog converters (DACs). The TxDAC family, which consists of pin compatible 8-, 10-, 12-, and 14-bit DACs, is specifically optimized for the transmit signal path of communication systems. All of the devices share the same interface options, small outline package and pinout, thus providing an upward or downward component selection path based on performance, resolution and cost. The AD9750 offers exceptional ac and dc performance while supporting update rates up to 125 MSPS.

The AD9751 is a dual muxed port, ultrahigh speed, single-channel, 10-bit CMOS DAC. It integrates a high quality 10-bit TxDAC+ core, a voltage reference, and digital interface circuitry into a small 48-lead LQFP package. The AD9751 offers exceptional ac and dc performance while supporting update rates up to 300 MSPS.The AD9751 has been optimized for ultrahigh speed applications up to 300 MSPS where data rates exceed those possible on a single data interface port DAC. The digital interface consists of two buffered latches as well as control logic. These latches can be time multiplexed to the high speed DAC in several ways. This PLL drives the DAC latch at twice the speed of the externally applied clock and is able to interleave the data from the two input channels. The resulting output data rate is twice that of the two input channels. With the PLL disabled, an external 2× clock may be supplied and divided by two internally.The CLK inputs (CLK+/CLK–) can be driven either differentially or single-ended, with a signal swing as low as 1 VP-P.The DAC utilizes a segmented current source architecture combined with a proprietary switching technique to reduce glitch energy and maximize dynamic accuracy. Differential current outputs support single-ended or differential applications. The differential outputs each provide a nominal full-scale current from 2 mA to 20 mA.The AD9751 is manufactured on an advanced low cost 0.35 µm CMOS process. It operates from a single supply of 3.0 V to 3.6 V and consumes 155 mW of power.PRODUCT HIGHLIGHTSThe AD9751 is a member of a pin compatible family of high speed TxDAC+s, providing 10-, 12-, and 14-bit resolution.Ultrahigh Speed 300 MSPS Conversion Rate.Dual 10-Bit Latched, Multiplexed Input Ports. The AD9751 features a flexible digital interface allowing high speed data conversion through either a single or dual port input.Low Power. Complete CMOS DAC function operates on 155 mW from a 3.0 V to 3.6 V single supply. The DAC full-scale current can be reduced for lower power operation.On-Chip Voltage Reference. The AD9751 includes a 1.20 V temperature compensated band gap voltage reference.APPLICATIONSCommunications: LMDS, LMCS, MMDSBase StationsDigital SynthesisQAM and OFDM

The AD9752 is a 12-bit resolution second generation member of the TxDAC series of high performance, low power CMOS digital-to-analog converters (DACs). The TxDAC family, which consists of pin compatible 8-, 10-, 12-, and 14-bit DACs, is specifically optimized for the transmit signal path of communication systems. All of the devices share the same interface options, small outline package and pinout, thus providing an upward or downward component selection path based on performance, resolution and cost. The AD9752 offers exceptional ac and dc performance while supporting update rates up to 125 MSPS.APPLICATIONSWideband Communication Transmit Channel:Direct IFBasestationsWireless Local LoopDigital Radio LinkDirect Digital Synthesis (DDS)InstrumentationPRODUCT HIGHLIGHTSThe AD9752 is a member of the wideband TxDACproduct family that provides an upward or downward component selection path based on resolution (8 to 14 bits), performance and cost. The entire family of TxDACs is available in industry standard pinouts.Manufactured on a CMOS process, the AD9752 uses a proprietary switching technique that enhances dynamic performance beyond that previously attainable by higher power/cost bipolar or BiCMOS devices.On-chip, edge-triggered input CMOS latches interface readily to +2.7 V to +5 V CMOS logic families. The AD9752 can support update rates up to 125 MSPS.A flexible single-supply operating range of 4.5 V to 5.5 V and a wide full-scale current adjustment span of 2 mA to 20 mA allow the AD9752 to operate at reduced power levels.The current output(s) of the AD9752 can be easily configured for various single-ended or differential circuit topologies.

The AD9754 is a 14-bit resolution second generation member of the TxDAC®series of high performance, low power CMOS digital-to-analog converters (DACs). The TxDAC family, which consists of pin compatible 8-, 10-, 12- and 14-bit DACs, is specifically optimized for the transmit signal path of communication systems. All of the devices 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 AD9754 offers exceptional ac and dc performance while supporting update rates up to 125 MSPS.TxDAC is a registered trademark of Analog Devices, Inc.

The AD9760 and AD9760-50 are the 10-bit resolution members of the TxDAC series of high performance, low power CMOS digital-to-analog converters (DACs). The AD9760-50 is a lower performance option that is guaranteed and specified for 50 MSPS operation. The TxDAC family that consists of pin compatible 8-, 10-, 12- and 14-bit DACs is specifically optimized for the transmit signal path of communication systems. All of the devices share the same interface options, small outline package and pinout, thus providing an upward or downward component selection path based on performance, resolution and cost. Both the AD9760 and AD9760-50 offer exceptional ac and dc performance while supporting update rates up to 125 MSPS and 60 MSPS respectively.The AD9760's flexible single-supply operating range of 2.7 V to 5.5 V and low power dissipation are well suited for portable and low power applications. Its power dissipation can be further reduced to a mere 45 mW without a significant degradation in performance by lowering the full-scale current output. Also, a power-down mode reduces the standby power dissipation to approximately 25 mW.The AD9760 is manufactured on an advanced CMOS process. 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 bandgap reference have been integrated to provide a complete monolithic DAC solution. Flexible supply options support +3 V and +5 V CMOS logic families.The AD9760 is a current-output DAC with a nominal full-scale output current of 20 mA and > 100 k(ohm) output impedance. Differential current outputs are provided to support single-ended or differential applications. Matching between the two current outputs ensures enhanced dynamic performance in a differential output configuration. The current outputs may be tied directly to an output resistor to provide two complementary, single-ended voltage outputs or fed directly into a transformer. The output voltage compliance range is 1.25 V.The on-chip reference and control amplifier are configured for maximum accuracy and flexibility. The AD9760 can be driven by the on-chip reference or by a variety of external reference voltages. The internal control amplifier that provides a wide (>10:1) adjustment span allows the AD9760 full-scale current to be adjusted over a 2 mA to 20 mA range while maintaining excellent dynamic performance. Thus, the AD9760 may operate at reduced power levels or be adjusted over a 20 dB range to provide additional gain ranging capabilities.The AD9760 is available in a 28-pin SOIC package. It is specified for operation over the industrial temperature range.PRODUCT HIGHLIGHTSThe AD9760 is a member of the TxDAC product family that provides an upward or downward component selection path based on resolution (8 to 14 bits), performance and cost.Manufactured on a CMOS process, the AD9760 uses a proprietary switching technique that enhances dynamic performance beyond what was previously attainable by higher power/cost bipolar or BiCMOS devices.On-chip, edge-triggered input CMOS latches interface readily to +3 V and +5 V CMOS logic families. The AD9760 can support update rates up to 125 MSPS.A flexible single-supply operating range of 2.7 V to 5.5 V and a wide full-scale current adjustment span of 2 mA to 20 mA allow the AD9760 to operate at reduced power levels.The current output(s) of the AD9760 can be easily configured for various single-ended or differential circuit topologies