19699-002-XTP ON Semiconductor, 19699-002-XTP Datasheet - Page 14

• Manufacturer Part Number: 19699-002-XTP
• Manufacturer: ON Semiconductor

Specifications of 19699-002-XTP

• Number Of Transmitters: 1
• Power Supply Requirement: Dual
• Package Type: LQFP
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 44
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Lead Free Status / RoHS Status: Compliant

AMIS-49200
4.3 Transmit Block
The transmit block contains four sub-blocks:
4.3.1. MDS-interface
The MDS-interface decodes input signals to generate internal control signals. The POL pin is used to select the polarity of TxE (transmit
enable). The TxE and TxS (transmit signal) are the MDS-MAU interface signals. These three signals are CMOS logic signals powered
by the V
connected to V
MDS_CTRL Pin 26 can be used to control MDS interface operation. Table 11 shows the resulting VDRV output for the various
combinations of interface signals.
Table 11: MDS-interface Logic
4.3.2. Tri-level Modulator
The tri-level modulator switches current signals into a summing node. The slew rate controller converts the current to a voltage signal,
VDRV. The DC level of silence (V
2.1V, yielding an amplitude of 0.8V.
POL
High
Low
1.
2.
3.
4.
MDS-interface – decodes input signals to generate internal control signals.
Tri-level modulator – generates current signals used as inputs to the slew-rate controller.
Slew rate controller – converts current to three distinct VDRV voltage levels (V
Current drive amplifier – op amp designed to drive current drivers for 31.25kbps voltage-mode medium.
DD
High
High
TxE
Low
Low
supply voltage. When POL is connected to GND, TxE is assumed to be active high (positive logic). Likewise, if POL is
DD
, TxE is assumed to be active low (negative logic).
High
High
High
High
TxS
Low
Low
Low
Low
VDRV
V
V
V
V
V
V
S
H
H
S
L
L
S
) is nominally 2.5V. Transmission high (V
Rev. 5 | Page 14 of 22 | www.onsemi.com
Figure 8: MDS Interface
See Table 1 on page 7, Table 11, and Figure 8 to see how
H
) is nominally 2.9V and transmission low (V
S
, V
H
, V
L
).
L
) is nominally