Sigma-Delta Modulator. AD7401A Datasheet

AD7401A Modulator. Datasheet pdf. Equivalent


Analog Devices AD7401A
Data Sheet
Isolated Sigma-Delta Modulator
AD7401A
FEATURES
20 MHz maximum external clock rate
Second-order modulator
16 bits, no missing codes
±2 LSB INL typical at 16 bits
1 µV/°C typical offset drift
On-board digital isolator
On-board reference
±250 mV analog input range
Low power operation: 17 mA typical at 5.5 V
−40°C to +125°C operating range
16-lead SOIC package
Internal clock version: AD7400A
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
VIORM = 891 V peak
Qualified for Automotive Applications
GENERAL DESCRIPTION
The AD7401A1 is a second-order, sigma-delta (Σ-Δ) modulator
that converts an analog input signal into a high speed, 1-bit data
stream with on-chip digital isolation based on the Analog
Devices, Inc., iCoupler® technology. The AD7401A operates
from a 5 V power supply and accepts a pseudo-differential input
signal of ±250 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 up to 20 MHz. The original information
can be reconstructed with an appropriate digital filter. The
serial I/O can use a 5 V or a 3.3 V supply (VDD2).
The serial interface is digitally isolated. High speed CMOS,
combined with Analog Devices, Inc., iCoupler® technology ,
means the on-chip isolation provides outstanding performance
characteristics, superior to alternatives such as optocoupler
devices. The device contains an on-chip reference. The
AD7401A is offered in a 16-lead SOIC and has an operating
temperature range of −40°C to +125°C.
APPLICATIONS
AC motor controls
Shunt current monitoring
Data acquisition systems
Analog-to-digital and opto-isolator replacements
FUNCTIONAL BLOCK DIAGRAM
VDD1
VDD2
VIN+
VIN
T/H
Σ-Δ ADC
BUF
REF
CONTROL LOGIC
UPDATE
ENCODE
WATCHDOG
AD7401A
WATCHDOG
DECODE
UPDATE
MDAT
DECODE
ENCODE
MCLKIN
GND1
Figure 1.
1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Other patents pending.
GND2
Rev. D
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AD7401A Datasheet
Recommendation AD7401A Datasheet
Part AD7401A
Description Isolated Sigma-Delta Modulator
Feature AD7401A; Isolated Sigma-Delta Modulator AD7401A FEATURES 20 MHz maximum external clock rate Second-order mod.
Manufacture Analog Devices
Datasheet
Download AD7401A Datasheet




Analog Devices AD7401A
AD7401A
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Specifications .................................................................. 5
Insulation and Safety-Related Specifications............................ 6
Regulatory Information............................................................... 6
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 Insulation
Characteristics .............................................................................. 7
Absolute Maximum Ratings............................................................ 8
ESD Caution.................................................................................. 8
Pin Configuration and Function Descriptions............................. 9
Typical Performance Characteristics ........................................... 10
Terminology .................................................................................... 13
REVISION HISTORY
1/2018—Rev. C to Rev. D
Changes to Features and General Description ............................. 1
Change to Power Dissipation Parameter, Table 1......................... 4
Changes to Table 3 and Table 4....................................................... 6
Changes to Absolute Maximum Rating Section........................... 8
Changes to Table 8............................................................................ 9
Changes to Terminology Section.................................................. 13
Changes to Ordering Guide .......................................................... 19
Added Automotive Product Section ............................................ 19
7/2011—Rev. B to Rev. C
Changes to Minimum External Air Gap (Clearance) Parameter,
Table 3 and Minimum External Tracking (Creepage) Parameter,
Table 3 ................................................................................................ 6
Changes to Figure 5; Pin 1 Description, Table 8; and Pin 7
Description, Table 8.......................................................................... 9
3/2011—Rev. A to Rev. B
Change to General Description Section ........................................ 1
Changes to Table 1............................................................................ 3
Data Sheet
Theory of Operation ...................................................................... 14
Circuit Information.................................................................... 14
Analog Input ............................................................................... 14
Differential Inputs ...................................................................... 15
Current Sensing Applications................................................... 15
Voltage Sensing Applications.................................................... 15
Digital Filter ................................................................................ 16
Applications Information .............................................................. 18
Grounding and Layout .............................................................. 18
Evaluating the AD7401A Performance ................................... 18
Insulation Lifetime ..................................................................... 18
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 19
Automotive Product................................................................... 19
1/2011—Rev. 0 to Rev. A
Change to Features, UL Recognition Value ...................................1
Change to Table 3, Input-to-Output Momentary Withstand
Voltage Value..................................................................................................6
Changes to Table 4, Isolation Voltage Value, and Endnote 1.......6
7/2008—Revision 0: Initial Version
Rev. D | Page 2 of 20



Analog Devices AD7401A
Data Sheet
AD7401A
SPECIFICATIONS
VDD1 = 4.5 V to 5.5 V, VDD2 = 3 V to 5.5 V, VIN+ = −200 mV to +200 mV, and VIN− = 0 V (single-ended); TA = −40°C to +125°C, fMCLKIN =
16 MHz maximum,1 tested with sinc3 filter, 256 decimation rate, as defined by Verilog code, unless otherwise noted.
Table 1.
Parameter
STATIC PERFORMANCE
Resolution
Integral Nonlinearity (INL)3
Differential Nonlinearity (DNL)3
Offset Error3
Offset Drift vs. Temperature3
Offset Drift vs. VDD13
Gain Error3
Gain Error Drift vs. Temperature3
Gain Error Drift vs. VDD13
ANALOG INPUT
Input Voltage Range
Dynamic Input Current
DC Leakage Current
Input Capacitance
DYNAMIC SPECIFICATIONS
Signal-to-(Noise + Distortion) Ratio (SINAD)3
Signal-to-Noise Ratio (SNR)3
Total Harmonic Distortion (THD)3
Peak Harmonic or Spurious Noise (SFDR)3
Effective Number of Bits (ENOB)3
Isolation Transient Immunity3
LOGIC INPUTS
Input High Voltage, VIH
Input Low Voltage, VIL
Input Current, IIN
Floating State Leakage Current
Input Capacitance, CIN4
Y Version1, 2
Min Typ Max
16
±1.5 ±7
±2 ±13
±1.5 ±11
±2 ±46
±0.9
±.025
1
120
0.07
±1
23
110
±0.5
3.5
±1.5
±200
±13
±10
0.08
±0.01
10
±250
±18
±15
±0.6
76 82
71 82
72 82
82
81 83
80 82
−90
−92
12.3 13.3
25 30
0.8 × VDD2
0.2 × VDD2
±0.5
1
10
Unit
Bits
LSB
LSB
LSB
LSB
LSB
mV
µV/°C
µV/V
mV
mV
µV/°C
µV/V
mV
µA
µA
µA
µA
pF
dB
dB
dB
dB
dB
dB
dB
dB
Bits
kV/µs
V
V
µA
µA
pF
Test Conditions/Comments
Filter output truncated to 16 bits
VIN+ = ±200 mV, TA = −40°C to +85°C, fMCLKIN = 20 MHz max1
VIN+ = ±250 mV, TA = −40°C to +85°C, fMCLKIN = 20 MHz max1
VIN+ = ±200 mV, TA = −40°C to +125°C, fMCLKIN = 20 MHz max1
VIN+ = ±250 mV, TA = −40°C to +125°C, fMCLKIN = 20 MHz max1
Guaranteed no missed codes to 16 bits,
fMCLKIN = 20 MHz max,1 VIN+ = −250 mV to +250 mV
fMCLKIN = 20 MHz max,1 VIN+ = −250 mV to +250 mV
fMCLKIN = 20 MHz max,1 VIN+ = −250 mV to +250 mV
For specified performance; full range ±320 mV
VIN+ = 500 mV, VIN− = 0 V, fMCLKIN = 20 MHz max1
VIN+ = 400 mV, VIN− = 0 V, fMCLKIN = 20 MHz max1
VIN+ = 0 V, VIN− = 0 V, fMCLKIN = 20 MHz max1
VIN+ = 5 kHz
VIN+ = ±200 mV, TA = −40°C to +85°C,
fMCLKIN = 5 MHz to 20 MHz1
VIN+ = ±250 mV, TA = −40°C to +85°C,
fMCLKIN = 5 MHz to 20 MHz1
VIN+ = ±200 mV, TA = −40°C to +125°C,
fMCLKIN = 5 MHz to 20 MHz1
VIN+ = ±250 mV, TA = −40°C to +125°C,
fMCLKIN = 5 MHz to 20 MHz1
VIN+ = ±250 mV, TA = −40°C to +125°C,
fMCLKIN = 5 MHz to 20 MHz1
VIN+ = ±200 mV, TA = −40°C to +125°C,
fMCLKIN = 5 MHz to 20 MHz1
fMCLKIN = 20 MHz max1, VIN+ = −250 mV to +250 mV
Rev. D | Page 3 of 20







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