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AD7825BN Datasheet(PDF) 1 Page - Analog Devices |
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AD7825BN Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 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 that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD7822/AD7825/AD7829 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2001 3 V/5 V, 2 MSPS, 8-Bit, 1-, 4-, 8-Channel Sampling ADCs FUNCTIONAL BLOCK DIAGRAM CONVST 8-BIT HALF FLASH ADC PARALLEL PORT VREFIN/ OUT EOC RD CS AGND VMID A0* A1* A2* VIN1 COMP PD* 2.5V REF VDD CONTROL LOGIC DGND INPUT MUX VIN2* VIN3* VIN4* VIN5* VIN6* VIN7* VIN8* T/H *A0, A1 *A2 * PD *VIN2 TO VIN4 *VIN4 TO VIN8 AD7825/AD7829 AD7829 AD7822/AD7825 AD7825/AD7829 AD7829 BUF DB0 DB7 FEATURES 8-Bit Half-Flash ADC with 420 ns Conversion Time 1, 4 and 8 Single-Ended Analog Input Channels Available with Input Offset Adjust On-Chip Track-and-Hold SNR Performance Given for Input Frequencies Up to 10 MHz On-Chip Reference (2.5 V) Automatic Power-Down at the End of Conversion Wide Operating Supply Range 3 V 10% and 5 V 10% Input Ranges 0 V to 2 V p-p, VDD = 3 V 10% 0 V to 2.5 V p-p, VDD = 5 V 10% Flexible Parallel Interface with EOC Pulse to Allow Stand-Alone Operation APPLICATIONS Data Acquisition Systems, DSP Front Ends Disk Drives Mobile Communication Systems, Subsampling Applications GENERAL DESCRIPTION The AD7822, AD7825, and AD7829 are high speed, 1-, 4-, and 8-channel, microprocessor-compatible, 8-bit analog-to-digital converters with a maximum throughput of 2 MSPS. The AD7822, AD7825, and AD7829 contain an on-chip reference of 2.5 V (2% tolerance), a track/hold amplifier, a 420 ns 8-bit half-flash ADC and a high speed parallel interface. The converters can operate from a single 3 V ± 10% and 5 V ± 10% supply. The AD7822, AD7825, and AD7829 combine the convert start and power-down functions at one pin, i.e., the CONVST pin. This allows a unique automatic power-down at the end of a conversion to be implemented. The logic level on the CONVST pin is sampled after the end of a conversion when an EOC (End of Conversion) signal goes high, and if it is logic low at that point, the ADC is powered down. The AD7822 and AD7825 also have a separate power-down pin. (See Operating Modes section of the data sheet.) The parallel interface is designed to allow easy interfacing to microprocessors and DSPs. Using only address decoding logic, the parts are easily mapped into the microprocessor address space. The EOC pulse allows the ADCs to be used in a stand- alone manner. (See Parallel Interface section of the data sheet.) The AD7822 and AD7825 are available in a 20-/24-lead 0.3" wide, plastic dual-in-line package (DIP), a 20-/24-lead small out- line IC (SOIC) and a 20-/24-lead thin shrink small outline package (TSSOP). The AD7829 is available in a 28-lead 0.6" wide, plastic dual-in-line package (DIP), a 28-lead small outline IC (SOIC) and in a 28-lead thin shrink small outline package (TSSOP). PRODUCT HIGHLIGHTS 1. Fast Conversion Time The AD7822, AD7825, and AD7829 have a conversion time of 420 ns. Faster conversion times maximize the DSP pro- cessing time in a real-time system. 2. Analog Input Span Adjustment The VMID pin allows the user to offset the input span. This feature can reduce the requirements of single-supply op amps and take into account any system offsets. 3. FPBW (Full Power Bandwidth) of Track-and-Hold The track-and-hold amplifier has an excellent high-frequency performance. The AD7822, AD7825, and AD7829 are capable of converting full-scale input signals up to a fre- quency of 10 MHz. This makes the parts ideally suited to subsampling applications. 4. Channel Selection Channel selection is made without the necessity of writing to the part. |
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