AMIS−492x0
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3
Table 1. PIN NUMBERS AND SIGNAL DESCRIPTION (continued)
Signal
Name
Description
I/O
(Note 1)
Pin
No.
SHUNT 8 AI Control pin of the shunt regulator. Its sink current (25 mA max) is controlled so that the voltage at
SHSETIN is equal to V
REF
(1.18 V).
VSS/SGND 9 Ground The Current absorbed by SHUNT pin (25 mA max) is fed to this pin, which must be connected to
the ground level.
VSS 10 Ground Ground
VSS 11 Ground Ground
SRSETIN 12 AI Feedback (inverting) input for the series regulator. The series regulator controls its output (SRAO)
to make this input voltage is equal to V
REF
(1.18 V).
SRSET 13 AO Divided voltage of VO output. Feeding this voltage into SRSETIN pin results in 3 V at VO pin.
SRAO 14 AO Output pin of an operational amplifier for the series regulator.
SRTR 15 AI Gate of a PMOS transistor for the series regulator.
VO 16 AO Output pin of the series regulator (20 mA max).
VDD 17 Digital Supply Supply voltage input for digital block.
VCC 18 Analog Supply Analog supply voltage.
CRT 19 AI/O Current integration to limit output slew rate.
VSS 20 Ground Ground
VDRV 21 AO Output of an operational amplifier for slew rate control. This signal can be fed to current driver.
VSS 22 Ground Ground
CCINP 23 AI Non-inverting input of an operational amplifier for transmission current driver.
CCINM 24 AI Inverting input of an operational amplifier for transmission current driver.
CCOUT 25 AO Output of an operational amplifier for transmission current driver.
MDS_CTRL 26 AI For POL = VDD MDS_CTRL should = VSS
For POL = VSS MDS_CTRL can be tied to VDD or used as a not reset to control when transmit
communications will be enabled.
SIGIN 27 AI
Input pin of the band-pass filter. This pin si connected to VMID bias level with 270 kW resistor.
HPF 28 AI Feedback signal of high-pass filter. This pin si connected to the output of an op-amp for high pass
filter with 75 kW resistor.
LPF 29 AI Non-inverting input of an operational amplifier for the low-pass filter.
FLT 30 AI Input pin of low-pass filter for feedback. This pin is connected to the output of the high-pass filter
through 20 kW and the non-inverting input of the low-pass filter through 54 kW resisters.
FLTOUT 31 AO Output of the operational amplifier for the low-pass filter. This signal is internally connected to
non-inverting input to form a voltage-follower.
CCD 32 AO Current integration (for carrier detect circuit).
VSS 33 Ground Ground
RXA 34 DO MDS−MAU interface signal for received signal activity. This pin is a push-pull output.
RXS 35 DO MDS−MAU interface signal for received signal. This pin is a push-pull output.
TXE 36 DIS MDS−MAU interface signal for enable signal transmission (Schmitt Trigger input).
TXS 37 DIS MDS−MAU interface signal for signal to be transmitted (Schmitt Trigger input).
POL 38 DIS Selects polarity of TxE input. When this pin is connected to GND, TxE is active high. When this pin
is connected to VDD, TxE is active low.
VSS 39 Ground Ground
VSS 40 Ground Ground
VSS 41 Ground Connect to ground.
VSS 42 Ground Connect to ground.
VSS 43 Ground Connect to ground.
VCC 44 Analog Supply Analog supply voltage.
1. AI = Analog Input, AO = Analog Output, AI/O = Analog Input/Output, DIS = CMOS Digital Input (Schmitt Trigger), DO = CMOS Digital
Output.
