73M1866B-IM/F Maxim Integrated Products, 73M1866B-IM/F Datasheet - Page 13

• Manufacturer Part Number: 73M1866B-IM/F
• Description: MICRODAA SGL PCM HIGHWAY 42-QFN
• Manufacturer: Maxim Integrated Products
• Series: MicroDAA™r

Specifications of 73M1866B-IM/F

• Includes: PCM Highway
• Function: Data Access Arrangement (DAA)
• Interface: PCM, Serial, SPI
• Number Of Circuits: 1
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 42-VFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Power (watts): -

AN_1x66B_003
Cost Reducing the Design
The overall cost of the design can be reduced in many ways:
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Rev. 3.5
Some of the high-voltage capacitors can be “built” using lower voltage capacitors in series. Lower voltage
capacitors are generally less expensive than high-voltage parts, even though they have a higher capacitance
value. For example, two 0.047
part. If a lower isolation voltage can be tolerated, 2 kV capacitors can be used in place of the 3 kV parts that
are specified.
The bridge diode can also be built from two lower cost dual diodes in a smaller SOT-23 type package. The
overall footprint and placement can be made smaller and more flexible as well. The MMBD2004S is an
example of a part that could be used.
The reference design was intended to meet worldwide certification with a single design. Some countries have
less stringent requirements for the fuses and thyristors than those used in this design. If the design will only
be used in countries where less stringent standards are required, lower cost versions of these parts can be
used. It is possible to avoid fuses altogether if the product is in a fire enclosure and is supplied with a 26
AWG or larger RJ-11 telephone cable. But if this route is chosen, the reliability, potential fire and damage to
the other circuits in the enclosure should also be considered.
µ
F 100 V capacitors in series may be less expensive than a 0.022
73M1866B/73M1966B Schematic and Layout Guidelines
µ
F 200V
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