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參數(shù)資料
| 型號： | AD7827BN |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 14-Bit 48KSPS DAS with ADC, MUX, PGA and Internal Reference 28-SSOP -40 to 85 |
| 中文描述： | 1-CH 8-BIT FLASH METHOD ADC, SERIAL ACCESS, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 185K |
| 代理商： | AD7827BN |
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
FUNCT IONAL 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
6
10% and 5 V
6
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, V
DD
= 3 V
0 V to 2.5 V, V
DD
= 5 V
GE NE RAL DE SCRIPT ION
T he 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. T he 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. T he
serial interface is compatible with the serial interfaces of most
DSPs (Digital Signal Processors). T he throughput rate of the
AD7827 is dependent on the clock speed of the DSP serial
interface.
T he AD7827 combines the Convert Start and Power Down
signals at one pin, i.e., the
CONVST
pin. T his allows a unique
automatic power-down at the end of a conversion to be imple-
mented. T he logic level on the
CONVST
pin is sampled at the
end of a conversion and, depending on its state, the AD7827
powers down.
T he AD7827 has one single-ended analog input with an input
span determined by the supply voltage. With a V
DD
of 3 V, the
input range of the AD7827 is 0 V to 2 V and with V
DD
equal to
5 V, the input range is 0 V to 2.5 V.
T he 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 HIGHLIGHT S
1. Fast Conversion T ime
T he 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 T rack-and-Hold
T he analog input signal is held and a new conversion is initi-
ated on the falling edge of the
CONVST
signal. T he
CONVST
signal allows the sampling instant to be exactly controlled.
T his feature is a requirement in many DSP applications.
3. Automatic Power-Down
T he
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
V
DETECT
RFS
D
OUT
SCLK
CONVST
GND
V
DD
V
REFIN
/V
REFOUT
V
IN
COMP
AD7827
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