AD7400AYRWZ-RL Analog Devices Inc, AD7400AYRWZ-RL Datasheet

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AD7400AYRWZ-RL

Manufacturer Part Number
AD7400AYRWZ-RL
Description
Isolated Sigma-Delta Modulator ADC I.C.
Manufacturer
Analog Devices Inc
Type
Modulatorr
Datasheet

Specifications of AD7400AYRWZ-RL

Resolution (bits)
14 b
Data Interface
Serial
Voltage Supply Source
Single Supply
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (0.300", 7.5mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Sampling Rate (per Second)
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
FEATURES
10 MHz clock rate
Second-order modulator
16 bits, no missing codes
±2 LSB INL typical at 16 bits
1.5 μV/°C typical offset drift
On-board digital isolator
On-board reference
±250 mV analog input range
Low power operation: 15.5 mA typical at 5.5 V
−40°C to +125°C operating range
8-lead surface-mount PDIP package with gull wing leads and
APPLICATIONS
AC motor controls
Shunt current monitoring
Data acquisition systems
Analog-to-digital and opto-isolator replacements
Rev. B
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.
16-lead SOIC package
AD7401A, external clock version in 16-lead SOIC
Safety and regulatory approvals
UL recognition
CSA Component Acceptance Notice #5A
VDE Certificate of Conformity
5000 V rms for 1 minute per UL 1577
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
V
IORM
V
V
= 891 V peak
IN
IN
+
REF
CONTROL LOGIC
Σ-Δ ADC
V
DD1
FUNCTIONAL BLOCK DIAGRAM
GND
1
Figure 1.
UPDATE
UPDATE
Isolated Sigma-Delta Modulator
ENCODE
ENCODE
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
GENERAL DESCRIPTION
The AD7400A
an analog input signal into a high speed, 1-bit data stream with
on-chip digital isolation based on Analog Devices, Inc., iCoupler®
technology. The AD7400A operates from a 5 V power supply
and accepts a differential input signal of ±250 mV (±320 mV
full scale). The analog input is sampled continuously 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
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 and has an
operating temperature range of −40°C to +125°C. The AD7400A is
offered in an 8-lead surface-mount PDIP with gull wing leads and
a 16-lead SOIC package.
1
Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Other patents
are pending.
DECODE
DECODE
1
is a second-order, Σ-Δ modulator that converts
WATCHDOG
WATCHDOG
©2008–2011 Analog Devices, Inc. All rights reserved.
AD7400A
V
DD2
GND
2
MDAT
MCLKOUT
AD7400A
www.analog.com
DD2
).

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AD7400AYRWZ-RL Summary of contents

Page 1

FEATURES 10 MHz clock rate Second-order modulator 16 bits, no missing codes ±2 LSB INL typical at 16 bits 1.5 μV/°C typical offset drift On-board digital isolator On-board reference ±250 mV analog input range Low power operation: 15.5 mA typical ...

Page 2

AD7400A TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Timing Specifications .................................................................. 4 Insulation and Safety-Related Specifications ............................ 5 Regulatory Information ............................................................... 5 ...

Page 3

SPECIFICATIONS DD1 DD2 T = −40°C to +125°C, except where specified unless otherwise noted. Table 1. Parameter STATIC PERFORMANCE Resolution Integral Nonlinearity 2 ...

Page 4

AD7400A TIMING SPECIFICATIONS DD1 DD2 Table 2. Parameter Limit MIN MAX MCLKOUT 9/ ...

Page 5

INSULATION AND SAFETY-RELATED SPECIFICATIONS Table 3. Parameter Input-to-Output Momentary Withstand Voltage Minimum External Air Gap (Clearance) Minimum External Tracking (Creepage) Minimum Internal Gap (Internal Clearance) Tracking Resistance (Comparative Tracking Index) Isolation Group REGULATORY INFORMATION Table CSA Recognized ...

Page 6

AD7400A DIN V VDE V 0884-10 (VDE V 0884-10) INSULATION CHARACTERISTICS This isolator is suitable for reinforced electrical isolation only within the safety limit data. Maintenance of the safety data is ensured by means of protective circuits. Table 5. Parameter ...

Page 7

ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. All voltages are relative to A their respective ground. Table 6. Parameter V to GND DD1 GND DD2 2 Analog Input Voltage to GND 1 Output Voltage to ...

Page 8

AD7400A PIN CONFIGURATION AND FUNCTION DESCRIPTIONS DD1 AD7400A V + MCLKOUT TOP VIEW V – MDAT (Not to Scale) GND 4 GND 5 1 Figure 5. 8-Lead PDIP Pin Configuration ...

Page 9

TYPICAL PERFORMANCE CHARACTERISTICS T = 25°C, using 20 kHz brickwall filter, unless otherwise noted. A 110 100 DD1 DD2 NO DECOUPLING CAPACITOR 200mV SINE ...

Page 10

AD7400A 500 450 400 350 300 250 200 150 100 DD1 DD2 T = 25° –60 –40 – TEMPERATURE (°C) Figure 13. Offset Drift vs. Temperature 0.20 0.15 0.10 ...

Page 11

4.5V DD1 DD2 10.2 10.0 9 5.25V 9.6 DD1 DD2 9 DD1 DD2 9.2 9.0 TEMPERATURE (°C) Figure 19. MCLKOUT vs. Temperature for ...

Page 12

AD7400A TERMINOLOGY Differential Nonlinearity Differential nonlinearity is the difference between the measured and the ideal 1 LSB change between any two adjacent codes in the ADC. Integral Nonlinearity Integral nonlinearity is the maximum deviation from a straight line passing through ...

Page 13

THEORY OF OPERATION CIRCUIT INFORMATION The AD7400A isolated Σ -Δ modulator converts an analog input signal into a high speed (10 MHz typical), single-bit data stream; the time average of the single-bit data from the modulator is directly proportional to ...

Page 14

AD7400A DIFFERENTIAL INPUTS The analog input to the modulator is a switched capacitor design. The analog signal is converted into charge by highly linear sampling capacitors. A simplified equivalent circuit diagram of the analog input is shown in Figure 23. ...

Page 15

DIGITAL FILTER The overall system resolution and throughput rate is deter- mined by the filter selected and the decimation rate used. The higher the decimation rate, the greater the system accuracy, as illustrated in Figure 25. However, there is a ...

Page 16

AD7400A /*DIFFERENTIATOR (including decimation stage) Perform the differentiation stage (FIR lower speed. DIFF1 + + ACC3 – – – –1 – WORD_CLK Figure 27. Differentiator Z = one sample delay WORD_CLK = output word rate */ ...

Page 17

APPLICATIONS INFORMATION GROUNDING AND LAYOUT Supply decoupling with a value of 100 nF is strongly recom- mended on both V and V . Decoupling on one or DD1 DD2 both V pins does not significantly affect performance. In DDx applications ...

Page 18

... COPLANARITY 0.10 ORDERING GUIDE Model 1 Temperature Range AD7400AYNSZ −40°C to +125°C AD7400AYRWZ −40°C to +125°C AD7400AYRWZ-RL −40°C to +125°C EVAL-AD7400AEDZ EVAL-CED1Z RoHS Compliant Part. 0.379 (9.63) 0.375 (9.53) 0.371 (9.43) 0.388 (9.86) 5 0.380 (9.65) ...

Page 19

NOTES Rev Page AD7400A ...

Page 20

AD7400A NOTES ©2008–2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07077-0-1/11(B) Rev Page ...

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