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AD7400
Isolated Sigma-Delta Modulator
Isolated Sigma-Delta ModulatorFEATURES
Up to 20 MHz Data Rate (AD7401)
10 MHz Data Rate (AD7400) nd Order Modulator
±4 LSB INL @16 Bits
Onboard Digital Isolator
Onboard Reference
Low Power Operation: 15 mA @ 5 V
-40�C to +105�C Operating Range
16-ld SOIC Package
Safety and Regulatory Approvals
UL Recognition 3750 VRMS 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 VIORM = 840VPEAK
APPLICATIONS
AC Motor Control
Data Acquisition Systems
A/D + Opto-Isolator Replacement
GENERAL DESCRIPTION The AD7400/AD7401 are 2nd order sigma-delta modulators
that convert an analog input signal into a high speed 1-bit data
stream with onboard digital isolation based on Analog Devices’
iCoupler® technology. The AD7400/AD7401 operate from a 5 V
power supply and accept a differential input signal of ±200 mV.
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 data rates up to 20MHz. The
original information can be reconstructed with an appropriate
digital filter. The serial I/O may use a 5V or 3V supply (VDD2).
The serial interface is digitally isolated. High-speed CMOS,
FUNCTIONAL BLOCK DIAGRAM
VDD1
MCLKOUT*
MDAT
GND1
VDD2
GND2
VIN+
VIN-
*MCLKIN pin on AD7401
Rev. PrH
combined with monolithic air core transformer technology, means the onboard isolation provides outstanding performance
characteristics superior to alternatives such as optocoupler devices. The parts provide an on-chip 2.5V reference. The AD7400/AD7401
are offered in a 16-lead SOIC package and have an operating temperature range of -40°C to +105°C.
TABLE OF CONTENTS AD7400—Specifications..................................................................3
AD7401—Specifications..................................................................4
TIMING SPECIFICATIONS1.....................................................5
Absolute Maximum Ratings1,3.........................................................6
Pin Functional Descriptions........................................................8
Theory of Operation.....................................................................9
Outline Dimensions.......................................................................10
REVISION HISTORY Revision PrH: Preliminary Version
AD7400—SPECIFICATIONS1
Table 1. (VDD1 = VDD2 = 4.5V to 5.5V, , VIN+ = -200mV to +200mV and VIN- = 0V; TA = TMIN to TMAX, fMCLK = 10MHz unless
otherwise noted.) NOTES Temperature ranges as follows: -40�C to +105�C
2 See Terminology section.
3 Sample tested @ 25�C to ensure compliance. Filter as defined by Verilog Code.
5 All voltages are relative to their respective ground. Beyond the full-scale input range the output is either all zeroes or all ones.
AD7401—SPECIFICATIONS3
Table 2. (VDD1 = VDD2 = 4.5V to 5.5V, , VIN+ = -200mV to +200mV and VIN- = 0V; TA = TMIN to TMAX, fMCLK = 20MHz unless
otherwise noted.) NOTES Temperature ranges as follows: -40�C to +105�C
4 See Terminology section.
3 Sample tested @ 25�C to ensure compliance. Filter as defined by Verilog Code.
5 All voltages are relative to their respective ground. Beyond the full-scale input range the output is either all zeroes or all ones.
TIMING SPECIFICATIONS1
Table 3. AD7400/AD7401 Timing Specifications (VDD1 = VDD2 = 4.5V to 5.5V, TA = TMAX to TMIN unless otherwise noted.) NOTES Sample tested @ 25�C to ensure compliance. All input signals are specified with tr = tf = 5ns (10% to 90% of VDD1) and timed form a voltage level of 1.6 Volts. See Figure
1. Mark Space ratio for the MCLKIN input is 40/60 to 60/40.
3 Measured with the load circuit of Figure 1 and defined as the time required for the output to cross 0.8V or 2.0V.
+1.6V
IOL200µA
200µAIOH
OUTPUT
PIN
50pFFigure 1. Load Circuit for Digital Output Timing Specifications
MCLKIN /
MCLKOUT
MDATt2t3Figure 2. Data Timing
ABSOLUTE MAXIMUM RATINGS1,3
Table 4. AD7400/AD7401 Absolute Maximum Ratings (TA = +25°C unless otherwise noted)NOTES
1Stresses above those listed under Absolute Maximum Ratings may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those
indicated in the operational section of this specification is not implied.
Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
2Transient currents of up to 100mA will not cause SCR latch up. All voltages are relative to their respective ground.
REGULATORY INFORMATION
(PENDING)
Table 5. Insulation and Safety Related Specifications
Parameter Symbol Value Units Conditions NOTES In accordance with UL1577, each AD7400/AD7401 is proof tested by applying an insulation test voltage ≥ 4500 V rms for 1 second (current leakage detection limit =
5 µA). In accordance with DIN EN 60747-5-2, each AD7400/AD7401 is proof tested by applying an insulation test voltage ≥ 1670 V peak for 1 second (partial discharge
detection limit = 5 pC).
