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| 型號： | AD7824CQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | TRANS ARRAY PNP/PNP SSS MINI-6P |
| 中文描述： | 4-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, CDIP24 |
| 封裝： | HERMETIC SEALED, CERDIP-24 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大小： | 270K |
| 代理商： | AD7824CQ |
REV. F
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. Trademarks and
registered trademarks are the property of their respective companies.
a
LC
2
MOS High Speed
4- and 8-Channel 8-Bit ADCs
AD7824/AD7828
Tel: 781/329-4700 Fax: 781/326-8703
www.analog.comFUNCTIONAL BLOCK DIAGRAM
RDY
CS
RD
INT
DB3
DB2
DB1
DB0
DB7
DB6
DB5
DB4
THREE-
STATE
DRIVERS
4-BIT
FLASH
ADC
(4LSB)
V
REF
(+)
16
TIMING AND CONTROL
CIRCUITRY
ADDRESS
LATCH
DECODE
AIN1
AIN4
AIN8
MUX
*
*
AD7824 – 4-CHANNEL MUX
**
AD7828 – 8-CHANNEL MUX
A2 – AD7828 ONLY
A0 A1 A2
**
V
REF
(+)
V
REF
(–)
4-BIT
FLASH
ADC
(4MSB)
4-BIT
DAC
FEATURES
4 or 8 Analog Input Channels
Built-In Track-and-Hold Function
10 kHz Signal Handling on Each Channel
Fast Microprocessor Interface
Single 5 V Supply
Low Power: 50 mW
Fast Conversion Rate: 2.5 s/Channel
Tight Error Specification: 1/2 LSB
GENERAL DESCRIPTION
The AD7824 and AD7828 are high speed, multichannel, 8-bit
ADCs with a choice of four (AD7824) or eight (AD7828)
multi-
plexed analog inputs. A half-flash conversion technique gives a fast
conversion rate of 2.5
μ
s per channel, and the parts have a built-in
track-and-hold function capable of digitizing full-scale signals of
10 kHz (157 mV/
μ
s slew rate) on all channels. The AD7824 and
AD7828 operate from a single 5 V supply and have an analog input
range of 0 V to 5 V, using an external 5 V reference.
Microprocessor interfacing of the parts is simple, using standard
Chip Select (
CS
) and Read (
RD
) signals to initiate the conversion
and read the data from the three-state data outputs. The half-flash
conversion technique means that there is no need to generate a
clock signal for the ADC. The AD7824 and AD7828 can be
interfaced easily to most popular microprocessors.
The AD7824 and AD7828 are fabricated in an advanced, all
ion-implanted, linear compatible CMOS process (LC
2
MOS) and
have low power dissipation of 40 mW (typ). The AD7824 is
available in a 0.3" wide, 24-lead “skinny” DIP, while the AD7828
is available in a 0.6" wide, 28-lead DIP and in 28-terminal
surface-
mount packages.
PRODUCT HIGHLIGHTS
1. 4- or 8-channel input multiplexer gives cost effective,
space-saving multichannel ADC system.
2. Fast conversion rate of 2.5
μ
s/channel features a per-channel
sampling frequency of 100 kHz for the AD7824 or 50 kHz
for the AD7828.
3.
Built-in track-and-hold function allows handling of four or
eight channels up to 10 kHz bandwidth (157 mV/
μ
s slew rate).
4. Tight total unadjusted error spec and channel-to-channel
matching eliminate the need for user trims.
5. Single 5 V supply simplifies system power requirements.
6. Fast, easy-to-use digital interface allows connection to most
popular microprocessors with minimal external components.
No clock signal is required for the ADC.
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