集成电路AD975ANZ

FEATURES High Performance Member of Pin-Compatible TxDAC Product Family 125 MSPS Update Rate 10-Bit Resolution Excellent Spurious Free Dynamic Range Performance SFDR to Nyquist @ 5 MHz Output: 76 dBc Differential Current Outputs: 2 mA to 20 mA Power Dissipation: 190 mW @ 5 V Power-Down Mode: 20 mW @ 5 V On-Chip 1.20 V Reference CMOS-Compatible +2.7 V to +5.5 V Digital Interface Packages: 28-Lead SOIC and TSSOP Edge-Triggered Latches APPLICATIONS Wideband Communication Transmit Channel: Direct IF Basestations Wireless Local Loop Digital Radio Link Direct Digital Synthesis (DDS) Instrumentation The AD9750 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. The digital inputs support +2.7 V and +5 V CMOS logic families. TxDAC is a registered trademark of Analog Devices, Inc. *Protected by U.S. Patents Numbers 5450084, 5568145, 5689257, 5612697 and 5703519. Other patents pending. The AD9750 is a current-output DAC with a nominal full-scale output current of 20 mA and > 100 kΩ output impedance. Differential current outputs are provided to support singleended 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 AD9750 can be driven by the on-chip reference or by a variety of external reference voltages. The internal control amplifier, which provides a wide (>10:1) adjustment span, allows the AD9750 full-scale current to be adjusted over a 2 mA to 20 mA range while maintaining excellent dynamic performance. Thus, the AD9750 may operate at reduced power levels or be adjusted over a 20 dB range to provide additional gain ranging capabilities. The AD9750 is available in 28-lead SOIC and TSSOP packages. It is specified for operation over the industrial temperature range. PRODUCT HIGHLIGHTS 1. The AD9750 is a member of the wideband TxDAChigh performance product 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. 2. Manufactured on a CMOS process, the AD9750 uses a proprietary switching technique that enhances dynamic performance beyond that previously attainable by higher power/cost bipolar or BiCMOS devices. 3. On-chip, edge-triggered input CMOS latches interface to +2.7 V to +5 V CMOS logic families. The AD9750 can support update rates up to 125 MSPS. 4. 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, allows the AD9750 to operate at reduced power levels. 5. The current output(s) of the AD9750 can be easily configured for various single-ended or differential circuit topologies. PRODUCT DESCRIPTION The AD9750 is a 10-bit resolution, wideband, second generation member of the TxDAC series of high performance, low power CMOS digital-to-analog-converters (DACs). The TxDACfamily, 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 AD9750’s flexible single-supply operating range of 4.5 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 65 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 apprixmatley 20 mW.

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