EVAL-AD7400EB AD [Analog Devices], EVAL-AD7400EB Datasheet
EVAL-AD7400EB
Related parts for EVAL-AD7400EB
EVAL-AD7400EB 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
... Changes to Analog Input Section................................................. 13 Changes to Figure 26...................................................................... 15 Typical Performance Characteristics ..............................................9 Terminology .................................................................................... 12 Theory of Operation ...................................................................... 13 Circuit Information.................................................................... 13 Analog Input ............................................................................... 13 Differential Inputs ...................................................................... 14 Digital Filter ................................................................................ 14 Application Information................................................................ 17 Grounding and Layout .............................................................. 17 Evaluating the AD7400 Performance ...................................... 17 Insulation Lifetime ..................................................................... 17 Outline Dimensions ....................................................................... 18 Ordering Guide .......................................................................... 18 1/06—Revision 0: Initial Version Rev Page ...
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 Withstand 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 ...
Page 6
AD7400 DIN EN 60747-5-2 (VDE 0884 PART 2) INSULATION CHARACTERISTICS This isolator is suitable for basic electrical isolation only within the safety limit data. Maintenance of the safety data is ensured by means of protective circuits. Table 5. Description INSTALLATION ...
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 20 kHz brickwall filter, unless otherwise noted. A 100 200mV p-p SINEWAVE DECOUPLING DD1 100 200 ...
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 typ), 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
Sinc ACTION*/ always @ (mdata1) if(mdata1==0) ip_data1 < change from for 2's comp */ else ip_data1 <= 1; /*ACCUMULATOR (INTEGRATOR) Perform the accumulation (IIR) at the speed of the modulator. MCLKOUT ...
Page 16
AD7400 DECIMATION RATE Figure 28. SNR vs. Decimation Rate for Different Filter Types 3 SINC 2 SINC 1 SINC 100 1k Rev Page ...
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
... OUTLINE DIMENSIONS 0.30 (0.0118) 0.10 (0.0039) COPLANARITY 0.10 ORDERING GUIDE Model Temperature Range 1 AD7400YRWZ −40°C to +105°C 1 AD7400YRWZ-REEL −40°C to +105°C 1 AD7400YRWZ-REEL7 −40°C to +105°C EVAL-AD7400EB Pb-free part. 10.50 (0.4134) 10.10 (0.3976 7.60 (0.2992) 7.40 (0.2913) 1 10.65 (0.4193) 8 10.00 (0.3937) 1.27 (0.0500) BSC 2.65 (0.1043) 2.35 (0.0925) SEATING ...
Page 19
NOTES Rev Page AD7400 ...
Page 20
AD7400 NOTES ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04718-0-12/06(A) Rev Page ...