Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
AD9774EB Datasheet(PDF) 1 Page - Analog Devices |
|
AD9774EB Datasheet(HTML) 1 Page - Analog Devices |
1 / 24 page REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD9774 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1998 14-Bit, 32 MSPS TxDAC+™ with 4 Interpolation Filters FUNCTIONAL BLOCK DIAGRAM VCO IN/EXT PLL DIVIDE PLLCOM REFLO PLL CLOCK MULTIPLIER REFIO SNOOZE IOUTA FSADJ AD9774 SLEEP DCOM DVDD ICOMP ACOM AVDD +1.2V REFERENCE AND CONTROL AMP PLL ENABLE PLLLOCK CLK4 IN PLLVDD LPF IOUTB EDGE TRIGGERED LATCHES 14 14-BIT DAC DATA INPUTS (DB13-DB0) 2 2 1 2 4 4 14 14 14 CLK IN/OUT REFCOMP PRODUCT DESCRIPTION The AD9774 is a single supply, oversampling, 14-bit digital-to- analog converter (DAC) optimized for waveform reconstruction applications requiring exceptional dynamic range. Manufac- tured on an advanced CMOS process, it integrates a complete, low distortion 14-bit DAC with a 4 × digital interpolation filter and clock multiplier. The two-stage, 4 × digital interpolation filter provides more than a six-fold reduction in the complexity of the analog reconstruction-filter. It does so by multiplying the input data rate by a factor of four while simultaneously suppressing the original inband images by more than 69 dB. The on-chip clock multiplier provides all the necessary clocks. The AD9774 can reconstruct full-scale waveforms having bandwidths as high as 13.5 MHz when operating at an input data rate of 32 MSPS and a DAC output rate of 128 MSPS. The 14-bit DAC provides differential current outputs to support differential or single-ended applications. A segmented current source architecture is combined with a proprietary switching tech- nique to reduce spurious components and enhance dynamic per- formance. Matching between the two current outputs ensures enhanced dynamic performance in a differential output configura- tion. The differential current outputs may be fed into a transformer or tied directly to an output resistor to provide two complementary, single-ended voltage outputs. A differential op amp topology can also be used to obtain a single-ended output voltage. The output voltage compliance range is nominally 1.25 V. Edge-triggered input latches, a 4 × clock multiplier, and a tem- perature compensated bandgap reference have also been inte- grated to provide a complete monolithic DAC solution. Flexible supply options support +3 V and +5 V CMOS logic families. TTL logic levels can also be accommodated by reducing the AD9774 digital supply. The on-chip reference and control amplifier are configured for maximum accuracy and flexibility. The AD9774 can be driven by the on-chip reference or by a variety of external reference voltages. The full-scale current of the AD9774 can be adjusted over a 2 mA to 20 mA range, thus providing additional gain ranging capabilities. The AD9774 is available in a 44-lead MQFP package. It is specified for operation over the industrial temperature range. PRODUCT HIGHLIGHTS 1. On-Chip 4 × interpolation filter eases analog reconstruction filter requirements by suppressing the first three images by 69 dB. 2. Low glitch and fast settling time provide outstanding dynamic performance for waveform reconstruction or digital synthesis requirements, including communications. 3. On-chip, edge-triggered input CMOS latches interface readily to CMOS and TTL logic families. The AD9774 can support input data rates up to 32 MSPS. 4. A temperature compensated, 1.20 V bandgap reference is included on-chip, providing a complete DAC solution. An external reference may also be used. 5. The current output(s) of the AD9774 can easily be configured for various single-ended or differential circuit topologies. 6. On-chip clock multiplier generates all the high-speed clocks required by the internal interpolation filters. Both 2 × and 4× clocks are generated from the lower rate data clock supplied by the user. TxDAC+ is a trademark of Analog Devices, Inc. FEATURES Single 3 V or 5 V Supply 14-Bit DAC Resolution and Input Data Width 32 MSPS Input Data Rate at 5 V 13.5 MHz Reconstruction Bandwidth 12 ENOBS @ 1 MHz 77 dBc SFDR @ 5 MHz 4 Interpolation Filter 69 dB Image Rejection 84% Passband to Nyquist Ratio 0.002 dB Passband Ripple 23 3/4 Cycle Latency Internal 4 Clock Multiplier On-Chip 1.20 V Reference 44-Lead MQFP Package APPLICATIONS Communication Transmit Channel: Wireless Basestations ADSL/HFC Modems Direct Digital Synthesis (DDS) |
Número de pieza similar - AD9774EB |
|
Descripción similar - AD9774EB |
|
|
Enlace URL |
Política de Privacidad |
ALLDATASHEET.ES |
¿ALLDATASHEET es útil para Ud.? [ DONATE ] |
Todo acerca de Alldatasheet | Publicidad | Contáctenos | Política de Privacidad | Intercambio de Enlaces | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |