73M1866B-IMR/F Maxim Integrated Products, 73M1866B-IMR/F Datasheet - Page 32

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

Specifications of 73M1866B-IMR/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): -

Parameter
Inductance
Interwinding
Capacitance
Turn Ratio
DC Resistance
Dielectric Breakdown
Voltage
ET Constant
Surge Test
Operating Temperature
73M1866B/73M1966B Data Sheet
4.4
The isolation element used by the 73M1x66B is a standard digital pulse transformer. Several vendors
supply compatible transformers with up to 6000 V ratings. Since the transformer is the only component
crossing the isolation barrier other than EMI capacitors that may be required, it solely determines the
isolation between the PSTN and the FXO’s digital interface. This method of isolation is significantly
superior to other isolation techniques with major advantages in high common mode voltage operation,
lower radiated noise (EMI) and improved operation in noisy environments. Table 29 lists some pulse
transformers compatible with the 73M1x66B. The table also includes low-voltage transformers that offer
low-cost alternatives if such voltages are sufficient.
Table 30 lists some of the typical pulse transformer specifications used by the 73M1x66B. Contact the
manufacturer directly for product information.
32
Isolation Barrier Pulse Transformer
Table 30: Pulse Transformer Electrical Characteristics
Test Condition
100 kHz, 10 mVAC, 1-2, Ls.
–
–
Primary
Secondary
1 sec
–
1.2 x 50 μs
–
Table 29: Compatible Pulse Transformer Sources
Company
Sumida
Wurth Electronics Midcom Inc.
UMEC
Datatronics
AAsupreme
2000
2800
Min
-40
54
–
–
–
–
–
Number
ESMIT 4180
ESMIT 4181
750110001
TG-UTB01543S
PT79280
P950003
Nom
3750
6000
1:1
1.2
60
–
–
–
–
Max
0.25
0.25
200
85
6
–
–
–
Tolerance
±2 %
DS_1x66B_001
–
–
–
–
–
–
–
–
Rev. 1.6
Vrms
Unit
N/A
Vμs
μH
pF
°C
Ω
Ω
V