參數(shù)資料
型號(hào)： AD7829
廠商： Analog Devices, Inc.
英文描述： 8-Channel Sampling ADCs(2MSPS,8通道采樣8位A/D轉(zhuǎn)換器)
中文描述： 8通道采樣ADC（2MSPS，8通道采樣8位的A / D轉(zhuǎn)換器）
文件頁(yè)數(shù)： 1/20頁(yè)
文件大?。?/td> 238K
代理商： AD7829
REV. 0
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
AD7822/AD7825/AD7829
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., 1997
3 V/5 V 2 MSPS, 8-Bit, 1-, 4-, 8-Channel
Sampling ADCs
FUNCT IONAL 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
On-Chip Reference (2.5 V)
Automatic Power-Down at the End of Conversion
Wide Operating Supply Range
3 V
6
10% and 5 V
6
10%
Input Ranges
0 V to 2 V p-p, V
DD
= 3 V
6
10%
0 V to 2.5 V p-p, V
DD
= 5 V
6
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
GE NE RAL DE SCRIPT ION
T he 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. T he
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. T he converters
can operate from a single 3 V
±
10% and 5 V
±
10% supply.
T he AD7822, AD7825 and AD7829 combine the convert start
and power-down functions at one pin, i.e., the
CONVST
pin.
T his allows a unique automatic power-down at the end of a
conversion to be implemented. T he 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. T he AD7822 and AD7825
also have a separate power-down pin. (See Operating Modes
section of the data sheet.)
T he 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. T he
EOC
pulse allows the ADCs to be used in a stand-
alone manner. (See Parallel Interface section of the data sheet.)
T he AD7822 and AD7825 are available in a 20-/24-lead 0.3"
wide, plastic dual-in-line package (DIP), a 20-/24-lead small
outline IC (SOIC) and a 20-/24-lead thin shrink small outline
package (T SSOP). T he 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
(T SSOP).
PRODUCT HIGHLIGHT S
1. Fast Conversion T ime
T he 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
T he V
MID
pin allows the user to offset the input span. T his
feature can reduce the requirements of single supply op amps
and take into account any system offsets.
3. FPBW (Full Power Bandwidth) of T rack and Hold
T he track-and-hold amplifier has an excellent high frequency
performance. T he AD7822, AD7825 and AD7829 are
capable of converting full-scale input signals up to a fre-
quency of 10 MHz. T his makes the parts ideally suited to
subsampling applications.
4. Channel Selection
Channel selection is made without the necessity of writing to
the part.
CONVST
DB0
DB7
8-BIT
HALF
FLASH
ADC
PARALLEL
PORT
VREF
IN
/REF
OUT
EOC
RD
CS
AGND
V
MID
A0*
A1*
A2*
V
IN1
V
IN2*
V
IN3*
V
IN4*
V
IN5*
V
IN6*
V
IN7*
V
IN8*
COMP
PD
*
2.5V
REF
V
DD
CONTROL
LOGIC
DGND
INPUT
MUX
BUF
T/H
*A0, A1
*A2
*
PD
*V
IN2
TO V
IN4
*V
IN4
TO V
IN8
AD7825/AD7829
AD7829
AD7822/AD7825
AD7825/AD7829
AD7829
相關(guān)PDF資料
PDF描述
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AD7834AN 2.35V-5.25V, 12 bit, 1MSPS, Serial ADC 6-SOT-23 -40 to 125
AD7834AR 2.35V-5.25V, 12 bit, 1MSPS, Serial ADC 6-SOT-23 -40 to 125
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD7829-1 制造商:AD 制造商全稱:Analog Devices 功能描述:3 V/5 V, 2 MSPS, 8-Bit, 8-Channel ADC
AD7829BN 制造商:Analog Devices 功能描述:ADC Single Semiflash 2Msps 8-bit Parallel 28-Pin PDIP W 制造商:Rochester Electronics LLC 功能描述:8-CHNL 2MSPS PARALLEL 8-BIT ADC I.C. - Bulk 制造商:Analog Devices 功能描述:IC 8BIT ADC 7829 DIP28
AD7829BNZ 制造商:Analog Devices 功能描述:ADC Single Semiflash 2Msps 8-bit Parallel 28-Pin PDIP W 制造商:Analog Devices 功能描述:IC 8BIT ADC 7829 DIP28
AD7829BNZ1 制造商:AD 制造商全稱:Analog Devices 功能描述:3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs
AD7829BR 制造商:Rochester Electronics LLC 功能描述:8-CHNL 2MSPS PARALLEL 8-BIT ADC I.C. - Bulk 制造商:Analog Devices 功能描述:IC 8-BIT ADC
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