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AD7721 Datasheet

Part Number AD7721
Manufacturers Analog Devices
Logo Analog Devices
Description CMOS 16-Bit/ 468.75 kHz/ Sigma-Delta ADC
Datasheet AD7721 DatasheetAD7721 Datasheet (PDF)

a FEATURES 16-Bit Sigma-Delta ADC 468.75 kHz Output Word Rate (OWR) No Missing Codes Low-Pass Digital Filter High Speed Serial Interface Linear Phase 229.2 kHz Input Bandwidth Power Supplies: AVDD, DVDD: +5 V ؎ 5% Standby Mode (70 ␮W) Parallel Mode (12-Bit/312.5 kHz OWR) CMOS 16-Bit, 468.75 kHz, Sigma-Delta ADC AD7721 FUNCTIONAL BLOCK DIAGRAM AGND DGND DGND DSUBST VIN1 VIN2 DVAL/SYNC CS RD WR DRDY SDATA/DB11 CONTROL LOGIC RFS/DB10 DB9 CLK AGND AVDD DVDD AD7721 12-BIT A/D CONVERTER ⌺-⌬ MODULATO.

  AD7721   AD7721






Part Number AD7729
Manufacturers Analog Devices
Logo Analog Devices
Description Dual Sigma-Delta ADC with Auxiliary DAC
Datasheet AD7721 DatasheetAD7729 Datasheet (PDF)

a FEATURES +3 V Supply Voltage Baseband Serial Port (BSPORT) Differential IRx and QRx ADC Channels Two 15-Bit Sigma-Delta A/D Converters FIR Digital Filters 64 dB SNR Output Word Rate 270.83 kHz Twos Complement Coding On-Chip Offset Calibration Power-Down Mode Auxiliary D/A Converter Auxiliary Serial Port (ASPORT) On-Chip Voltage Reference Low Power 28-Lead TSSOP/28-Lead SOIC APPLICATIONS GSM Basestations Pagers FUNCTIONAL BLOCK DIAGRAM DVDD2 DVDD1 DGND AGND AVDD1 Dual Sigma-Delta ADC with Auxi.

  AD7721   AD7721







Part Number AD7725
Manufacturers Analog Devices
Logo Analog Devices
Description 16-Bit 900 kSPS ADC with a Programmable Postprocessor
Datasheet AD7721 DatasheetAD7725 Datasheet (PDF)

16-Bit 900 kSPS ⌺-⌬ ADC with a Programmable Postprocessor AD7725 FEATURES Programmable Filtering: Any Characteristic up to 108 Tap FIR and/or IIR Polynomial Signal Conditioning up to 8th Order Programmable Decimation and Output Word Rate Flexible Programming Modes: Boot from DSP or External EPROM Parallel/Serial Interface Internal Default Filter for Evaluation 14.4 MHz Max Master Clock Frequency 0 V to +4 V (Single-Ended) or ؎2 V (Differential) Input Range Power Supplies: AVDD, DVDD: 5 V ؎ 5% On.

  AD7721   AD7721







Part Number AD7724
Manufacturers Analog Devices
Logo Analog Devices
Description Dual CMOS Modulators
Datasheet AD7721 DatasheetAD7724 Datasheet (PDF)

a FEATURES 13 MHz Master Clock Frequency 0 V to +2.5 V or ؎ 1.25 V Input Range Single Bit Output Stream 90 dB Dynamic Range Power Supplies AVDD, DVDD: 5 V␣ ؎ 5% DVDD1: 3 V ؎ 5% Logic Outputs 3 V/5 V Compatible On-Chip 2.5 V Voltage Reference 48-Lead LQFP Dual CMOS ⌺-⌬ Modulators AD7724 FUNCTIONAL BLOCK DIAGRAM REF1 REF2A 2.5V REFERENCE REF2B AD7724 AVIN(+) AVIN(–) ⌺-⌬ MODULATOR A ADATA SCLK BVIN(+) BVIN(–) ⌺-⌬ MODULATOR B BDATA XTAL OFF CLOCK CIRCUITRY XTAL1 XTAL2/MCLK DVAL MZERO GC BIP .

  AD7721   AD7721







Part Number AD7723
Manufacturers Analog Devices
Logo Analog Devices
Description 16-Bit 1.2 MSPS CMOS Sigma-Delta ADC
Datasheet AD7721 DatasheetAD7723 Datasheet (PDF)

a FEATURES 16-Bit Sigma-Delta ADC 1.2 MSPS Output Word Rate 32/16 ؋ Oversampling Ratio Low-Pass and Band-Pass Digital Filter Linear Phase On-Chip 2.5 V Voltage Reference Standby Mode Flexible Parallel or Serial Interface Crystal Oscillator Single +5 V Supply AVDD AGND VIN(+) VIN(–) 16-Bit, 1.2 MSPS CMOS, Sigma-Delta ADC AD7723 FUNCTIONAL BLOCK DIAGRAM AD7723 2.5V REFERENCE REF2 REF1 DVDD DGND MODULATOR FIR FILTER UNI HALF_PWR STBY MODE 1 MODE 2 SYNC DVDD / CS CFMT/ RD DGND/ DRDY DGND/DB0 XT.

  AD7721   AD7721







Part Number AD7722
Manufacturers Analog Devices
Logo Analog Devices
Description 16-Bit 195kSPS CMOS Sigma-Delta ADC
Datasheet AD7721 DatasheetAD7722 Datasheet (PDF)

a FEATURES 16-Bit Sigma-Delta ADC 64 ؋ Oversampling Ratio Up to 220 kSPS Output Word Rate Low-Pass, Linear Phase Digital Filter Inherently Monotonic On-Chip 2.5 V Voltage Reference Single Supply +5 V High Speed Parallel or Serial Interface 16-Bit, 195 kSPS CMOS, Sigma-Delta ADC AD7722 FUNCTIONAL BLOCK DIAGRAM DGND DVDD AGND AVDD REF1 AD7722 2.5V REFERENCE REF2 VIN(+) VIN(–) 16-BIT A/D CONVERTER Σ∆ MODULATOR FIR FILTER P/S CAL RESET SYNC CS DVAL/RD CFMT/DRDY DB0 DB1 DB2 CONTROL LOGIC CLOC.

  AD7721   AD7721







CMOS 16-Bit/ 468.75 kHz/ Sigma-Delta ADC

a FEATURES 16-Bit Sigma-Delta ADC 468.75 kHz Output Word Rate (OWR) No Missing Codes Low-Pass Digital Filter High Speed Serial Interface Linear Phase 229.2 kHz Input Bandwidth Power Supplies: AVDD, DVDD: +5 V ؎ 5% Standby Mode (70 ␮W) Parallel Mode (12-Bit/312.5 kHz OWR) CMOS 16-Bit, 468.75 kHz, Sigma-Delta ADC AD7721 FUNCTIONAL BLOCK DIAGRAM AGND DGND DGND DSUBST VIN1 VIN2 DVAL/SYNC CS RD WR DRDY SDATA/DB11 CONTROL LOGIC RFS/DB10 DB9 CLK AGND AVDD DVDD AD7721 12-BIT A/D CONVERTER ⌺-⌬ MODULATOR FIR FILTER REFIN STBY/DB0 CAL/DB1 UNI/DB2 GENERAL DESCRIPTION The AD7721 is a complete low power, 12-/16-bit, sigma-delta ADC. The part operates from a +5 V supply and accepts a differential input of 0 V to 2.5 V or ± 1.25 V. The analog input is continuously sampled by an analog modulator at twice the clock frequency eliminating the need for external sample-andhold circuitry. The modulator output is processed by two finite impulse response (FIR) digital filters in series. The on-chip filtering reduces the external antialias requirements to first order in most cases. Settling time for a step input is 97.07 µs while the group delay for the filter is 48.53 µs when the master clock equals 15 MHz. The AD7721 can be operated with input bandwidths up to 229.2 kHz. The corresponding output word rate is 468.75 kHz. The part can be operated with lower clock frequencies also. The sample rate, filter corner frequency and output word rate will be reduced also, as these are proportional to the .


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