73M1906B-IM/F Maxim Integrated Products, 73M1906B-IM/F Datasheet - Page 49

• Manufacturer Part Number: 73M1906B-IM/F
• Description: Interface - Specialized DAA-FXO VolP SYSTEM HOST SIDE
• Manufacturer: Maxim Integrated Products
• Type: MicroDAA with PCM Highwayr

Specifications of 73M1906B-IM/F

• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-20
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DS_1x66B_001
8.6
8.6.1 General Description
In the transmit path, data is first sent by the host DSP through a serial interface to the 73M1x66B then
interpolated by an interpolation filter, serialized and transmitted across barrier interface to the Line-Side
Device, which is floating relative to the Host-Side Device earth ground. The data received on the
Line-Side Device is then de-serialized and digitally sigma-delta modulated to a one-bit data stream of
1.536 Mbps for a sample frequency of 8 kHz or 3.072 Mbps for a sample frequency of 16 kHz. The signal
is further filtered first by a switched capacitor filter and then a continuous time anti-aliasing circuit.
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8.6.2 Total Transmit Path Response
Figure 26 and Figure 27 show the transmit path frequency response. The response shape is the same,
but the frequencies double for a 16 kHz sample rate.
Rev. 1.6
The 0.2 dB pass-band ripple frequency is from dc to 3.422 kHz for an 8 kHz sample rate or 6.844 kHz
for a 16 kHz sample rate.
The 3 dB bandwidth is 3.65 kHz for an 8 kHz sample rate or 7.299 kHz for a 16 kHz sample rate.
Transmit Path Signal Processing
comp osite x
composite x
Figure 27: Transmit Path Passband Response for an 8 kHz Sample Rate
Figure 26: Transmit Path Overall Frequency Response to Fs of 8 kHz
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Transmit Path Overall Frequency Response
Transmit Passband Response
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2.5
73M1866B/73M1966B Data Sheet
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