參數(shù)資料
型號(hào): EVAL-AD7400EB
廠商: Analog Devices, Inc.
英文描述: Isolated Sigma-Delta Modulator
中文描述: 隔離式Σ-Δ調(diào)制器
文件頁數(shù): 1/20頁
文件大?。?/td> 331K
代理商: EVAL-AD7400EB
Isolated Sigma-Delta Modulator
AD7400
FEATURES
Rev. A
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. Specifications subject to change without notice. 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 owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
2006 Analog Devices, Inc. All rights reserved.
www.analog.com
1
Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Other patents
pending.
10 MHz clock rate
Second-order modulator
16 bits no missing codes
±2 LSB INL typical at 16 bits
3.5 μV/°C maximum offset drift
On-board digital isolator
On-board reference
Low power operation: 18 mA maximum at 5.25 V
40°C to +105°C operating range
16-lead SOIC package
AD7401
, external clock version
Safety and regulatory approvals
UL recognition
3750 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice #5A
VDE Certificate of Conformity
DIN EN 60747-5-2 (VDE 0884 Part 2): 2003-01
DIN EN 60950 (VDE 0805): 2001-12; EN 60950: 2000
V
IORM
= 891 V peak
APPLICATIONS
AC motor controls
Data acquisition systems
A/D + opto-isolator replacements
GENERAL DESCRIPTION
The AD7400
1
is a second-order, Σ-Δ modulator that converts
an analog input signal into a high speed, 1-bit data stream with
on-chip digital isolation based on Analog Devices, Inc.
i
Coupler technology. The AD7400 operates from a 5 V power
supply and accepts a differential input signal of ±200 mV
(±320 mV full scale). The analog input is continuously sampled
by the analog modulator, eliminating the need for external
sample-and-hold circuitry. The input information is contained
in the output stream as a density of ones with a data rate of
10 MHz. The original information can be reconstructed with an
appropriate digital filter. The serial I/O can use a 5 V or a 3 V
supply (V
DD2
).
The serial interface is digitally isolated. High speed CMOS,
combined with monolithic air core transformer technology,
means the on-chip isolation provides outstanding performance
characteristics superior to alternatives such as optocoupler
devices. The part contains an on-chip reference. The AD7400 is
offered in a 16-lead SOIC and has an operating temperature
range of 40°C to +105°C.
FUNCTIONAL BLOCK DIAGRAM
0
V
IN
+
V
DD1
V
DD2
V
IN
Σ
-
Δ
ADC
CONTROL LOGIC
AD7400
BUF
T/H
REF
UPDATE
GND
1
GND
2
MDAT
MCLKOUT
ENCODE
ENCODE
DECODE
DECODE
WATCHDOG
WATCHDOG
UPDATE
Figure 1.
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