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參數(shù)資料
| 型號： | AD7827BRZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 8BIT SAMPLING SRL 8SOIC |
| 產(chǎn)品變化通告： | AD7827 Series Discontinuation 18/Jul/2012 |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 位數(shù)： | 8 |
| 采樣率（每秒）： | 1M |
| 數(shù)據(jù)接口： | DSP，串行 |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 30mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個單端，單極 |
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
AD7827
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., 1998
3 V/5 V, 1 MSPS, 8-Bit, Serial Interface
Sampling ADC
FUNCTIONAL BLOCK DIAGRAM
FEATURES
8-Bit Half-Flash ADC with 420 ns Conversion Time
200 ns Acquisition Time
8-Lead Package
On-Chip Track-and-Hold
On-Chip 2.5 V Reference with 2% Tolerance
Operating Supply Range: 3 V
10% and 5 V
10%
Specifications @ 3 V and 5 V
DSP/Microcontroller Compatible Serial Interface
Automatic Power-Down at End of Conversion
Input Ranges
0 V to 2 V, VDD = 3 V
0 V to 2.5 V, VDD = 5 V
GENERAL DESCRIPTION
The AD7827 is a high speed, single channel, low power, analog-
to-digital converter with a maximum throughput of 1 MSPS that
operates from a single 3 V or 5 V supply. The AD7827 contains
a track/hold amplifier, an on-chip 2.5 V reference (2% toler-
ance), a 420 ns 8-bit half-flash ADC and a serial interface. The
serial interface is compatible with the serial interfaces of most
DSPs (Digital Signal Processors). The throughput rate of the
AD7827 is dependent on the clock speed of the DSP serial
interface.
The AD7827 combines the Convert Start and Power Down
signals at one pin, i.e., the
CONVST pin. This allows a unique
automatic power-down at the end of a conversion to be imple-
mented. The logic level on the
CONVST pin is sampled at the
end of a conversion and, depending on its state, the AD7827
powers down.
The AD7827 has one single-ended analog input with an input
span determined by the supply voltage. With a VDD of 3 V, the
input range of the AD7827 is 0 V to 2 V and with VDD equal to
5 V, the input range is 0 V to 2.5 V.
The parts are available in a small, 8-lead, 0.3" wide, plastic
dual-in-line package (DIP) and an 8-lead, small outline IC
(SOIC).
PRODUCT HIGHLIGHTS
1. Fast Conversion Time
The AD7827 has a conversion time of 420 ns. Faster conver-
sion times maximize the DSP processing time in a real time
system.
2. Built-In Track-and-Hold
The analog input signal is held and a new conversion is initi-
ated on the falling edge of the
CONVST signal. The CONVST
signal allows the sampling instant to be exactly controlled.
This feature is a requirement in many DSP applications.
3. Automatic Power-Down
The
CONVST signal is sampled approximately 100 ns after
the end of conversion and depending on its state the AD7827
is powered down.
4. An easy to use, fast serial interface allows direct interfacing to
most popular DSPs with no external circuitry.
BUF
T/H
2.5V
REF
8-BIT
HALF-FLASH
ADC
SERIAL
PORT
CONTROL
LOGIC
VDD
DETECT
RFS
DOUT
SCLK
CONVST
GND
VDD
VREFIN/VREFOUT
VIN
COMP
AD7827
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