EVAL-AD7400EDZ

Manufacturer Part NumberEVAL-AD7400EDZ
DescriptionEVALUATION BOARD I.C.
ManufacturerAnalog Devices Inc
SeriesiCoupler®
EVAL-AD7400EDZ datasheets
 


Specifications of EVAL-AD7400EDZ

Number Of Adc's1Number Of Bits16
Sampling Rate (per Second)10MData InterfaceSerial
Inputs Per Adc1 DifferentialInput Range±320 mV
Power (typ) @ Conditions90mW @ 10MSPSVoltage Supply SourceSingle Supply
Operating Temperature-40°C ~ 105°CUtilized Ic / PartAD7400
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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FEATURES
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
Safety and regulatory approvals
UL recognition
5000 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice #5A
VDE Certificate of Conformity
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
V
= 891 V peak
IORM
APPLICATIONS
AC motor controls
Data acquisition systems
A/D + opto-isolator replacements
V
+
IN
Σ-∆ ADC
V
IN
REF
CONTROL LOGIC
Rev. D
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.
Isolated Sigma-Delta Modulator
GENERAL DESCRIPTION
The AD7400
that converts an analog input signal to a high speed, 1-bit data
stream with on-chip digital isolation based on Analog Devices,
Inc. iCoupler® 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
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.
An external clock version, AD7401, is also available.
1
Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Other patents
pending.
FUNCTIONAL BLOCK DIAGRAM
V
DD1
UPDATE
ENCODE
UPDATE
ENCODE
GND
1
Figure 1.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
AD7400
1
is a second-order, sigma-delta (Σ-Δ) modulator
).
DD2
V
DD2
AD7400
WATCHDOG
DECODE
MDAT
WATCHDOG
MCLKOUT
DECODE
GND
2
www.analog.com
©2006–2011 Analog Devices, Inc. All rights reserved.

EVAL-AD7400EDZ 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 3.5 μV/°C maximum offset drift On-board digital isolator On-board reference Low power operation maximum at 5.25 V −40°C to ...

  • Page 2

    ... Typical Performance Characteristics ..............................................9 Terminology .................................................................................... 12 Theory of Operation ...................................................................... 13 Circuit Information.................................................................... 13 Analog Input ............................................................................... 13 Differential Inputs ...................................................................... 14 Digital Filter ................................................................................ 15 Applications Information .............................................................. 17 Grounding and Layout .............................................................. 17 Evaluating the AD7400 Performance ...................................... 17 Insulation Lifetime ..................................................................... 17 Outline Dimensions ....................................................................... 18 Ordering Guide .......................................................................... 18 Updated VDE Certification Throughout ......................................1 Changes to Table 6.............................................................................7 12/06—Rev Rev. A Changes to Features ..........................................................................1 Changes to Table 6.............................................................................7 Changes to Analog Input Section ...

  • Page 3

    SPECIFICATIONS DD1 DD2 MHz, tested with Sinc filter, 256 decimation rate, as defined by Verilog code, unless otherwise noted. MCLK Table ...

  • Page 4

    AD7400 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

    AD7400 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. Description ...

  • 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

    AD7400 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 8. Pin Function Descriptions Pin No. Mnemonic Description Supply Voltage. 4 5.25 V. This is the supply voltage for the isolated side of the AD7400 and DD1 is ...

  • Page 9

    TYPICAL PERFORMANCE CHARACTERISTICS T = 25°C, using a 20 kHz brick wall filter, unless otherwise noted. A 100 200mV p-p SINEWAVE DECOUPLING DD1 ...

  • Page 10

    AD7400 100 V DD1 DD1 DD2 –50 –100 5.25V DD1 DD2 –150 –200 –45 –35 –25 –15 – 105 ...

  • Page 11

    BANDWIDTH = 100kHz 0.8 0.6 0.4 0 INPUT (V) IN Figure 18. RMS Noise Voltage vs Input IN 11.0 10.8 10.6 10 DD1 10.2 10.0 9.8 9.6 9 ...

  • Page 12

    AD7400 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 AD7400 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 modulator’s single-bit data is directly proportional to the input signal. ...

  • Page 14

    AD7400 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 3 A Sinc filter is recommended for use with the AD7400. This filter can be implemented on an FPGA or a DSP. The following Verilog code provides an example of a Sinc on a Xilinx® Spartan-II 2.5 V ...

  • Page 16

    AD7400 always @ (posedge word_clk or posedge reset) if(reset) begin acc3_d2 <= 0; diff1_d <= 0; diff2_d <= 0; diff1 <= 0; diff2 <= 0; diff3 <= 0; end else begin diff1 <= acc3 - acc3_d2; diff2 <= diff1 - ...

  • Page 17

    ... All insulation structures, subjected to sufficient time and/or voltage, are vulnerable to breakdown. In addition to the testing performed by the regulatory agencies, Analog Devices has carried out an extensive set of evaluations to determine the lifetime of the insulation structure within the AD7400. These tests subjected populations of devices to continuous cross-isolation voltages ...

  • Page 18

    ... REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. ORDERING GUIDE 1 Model Temperature Range AD7400YRWZ −40°C to +105°C AD7400YRWZ-REEL −40°C to +105°C AD7400YRWZ-REEL7 −40°C to +105°C EVAL-AD7400EDZ EVAL-CED1Z RoHS Compliant Part. 10.50 (0.4134) 10.10 (0.3976 7.60 (0.2992) 7.40 (0.2913 ...

  • Page 19

    NOTES Rev Page AD7400 ...

  • Page 20

    AD7400 NOTES ©2006–2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04718-0-4/11(D) Rev Page ...