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AD7825BNZ

更新时间： 2024-11-29 19:47:35
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亚德诺 - ADI 光电二极管转换器
页数 文件大小 规格书
20页 235K
描述
IC 4-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, PDIP24, 0.300 INCH, LEAD FREE, PLASTIC, MS-001AF, DIP-24, Analog to Digital Converter

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AD7825BNZ 数据手册

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3 V/5 V, 2 MSPS, 8-Bit, 1-, 4-, 8-Channel  
Sampling ADCs  
a
AD7822/AD7825/AD7829  
FUNCTIONAL BLOCK DIAGRAM  
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  
V
A0*  
A1* A2*  
DD  
CONVST EOC  
PD*  
CONTROL  
LOGIC  
COMP  
2.5V  
REF  
On-Chip Reference (2.5 V)  
V
IN1  
*
VREF  
BUF  
V
IN/OUT  
IN2  
Automatic Power-Down at the End of Conversion  
Wide Operating Supply Range  
3 V ؎ 10% and 5 V ؎ 10%  
V
*
*
IN3  
8-BIT  
INPUT  
MUX  
V
HALF  
FLASH  
ADC  
IN4  
T/H  
V
*
*
IN5  
DB7  
DB0  
PARALLEL  
PORT  
V
Input Ranges  
IN6  
V
*
IN7  
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  
V
*
IN8  
V
AGND DGND  
MID  
CS RD  
*A0, A1  
AD7825/AD7829  
AD7829  
AD7822/AD7825  
AD7825/AD7829  
AD7829  
*A2  
*PD  
*V  
APPLICATIONS  
Data Acquisition Systems, DSP Front Ends  
Disk Drives  
TO V  
TO V  
IN2  
IN4  
IN8  
*V  
IN4  
Mobile Communication Systems, Subsampling  
Applications  
GENERAL DESCRIPTION  
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).  
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.  
PRODUCT HIGHLIGHTS  
1. Fast Conversion Time  
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 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.  
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.)  
4. Channel Selection  
Channel selection is made without the necessity of writing to  
the part.  
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, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat  
may result from its use. No license is granted by implication or otherwise  
under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329-4700  
Fax: 781/326-8703  
www.analog.com  
© Analog Devices, Inc., 2001  
1234567...20

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