DS3150 Maxim Integrated Products, DS3150 Datasheet - Page 19

• Manufacturer Part Number: DS3150
• Description: 3.3V T3 / E3 / STS-1 Line Interface Unit
• Manufacturer: Maxim Integrated Products

Note 1: Pin type I = input pin. Pin type O = output pin. Pin type P = power-supply pin.
Note 2: Pin type I3 is an input capable of detecting three states: high, low, and float. All I3 inputs have an internal 13kW pullup to approximately
Note 3: Pin type O3 is an output that is tri-state capable.
NAME
TNEG
TPOS/
TNRZ
ZCSE
TX+,
VDD
VSS
TTS
TX-
1.5V. The voltage range of the float state is approximately 1.2V to 1.9V. If the function of the float state of an I3 pin is not defined in
Table
2-A, then the float state is used for factory test only.
(Note 2)
(Note 2)
(Note 3)
TYPE
O3
I3
I3
P
P
I
I
Transmit Negative Data. When the B3ZS/HDB3 encoder is disabled (ZCSE = 1),
TNEG should be driven high to transmit a negative AMI pulse. When the B3ZS/HDB3
encoder is enabled (ZCSE = 0), the NRZ data stream should be applied to TNRZ, while
TNEG is ignored and can be wired either high or low. TNEG is sampled either on the
falling edge of TCLK (ICE = 1 or Float) or the rising edge of TCLK (ICE = 0).
Transmit Positive Data. When the B3ZS/HDB3 encoder is disabled (ZCSE = 1), TPOS
should be driven high to transmit a positive AMI pulse. When the B3ZS/HDB3 encoder
is enabled (ZCSE = 0), the NRZ data stream should be applied to TNRZ. TPOS/TNRZ
is sampled either on the falling edge of TCLK (ICE = 1 or Float) or the rising edge of
TCLK (ICE = 0).
Transmit Tri-State. TTS determines whether the TX+ and TX- analog outputs are tri-
stated or active. This input also controls the jitter attenuator
0 = tri-state the transmit output driver, disable the jitter attenuator in the transmit path
1 = enable the transmit output driver, disable the jitter attenuator in the transmit path
Float = enable the transmit output driver, enable the jitter attenuator in the transmit path
Transmit Analog Outputs. These differential AMI outputs are coupled to the outbound
75W coaxial cable through a 2:1 step-down transformer
be tri-stated using the TTS input pin.
Positive Supply. 3.3V ±5%. All VDD pins should be wired together.
Ground Reference. All VSS pins should be wired together.
Zero Code Suppression Enable. ZCSE has an internal 80kW pullup to VDD.
0 = B3ZS/HDB3 encoder/decoder enabled (NRZ interface enabled)
1 = B3ZS/HDB3 encoder/decoder disabled (bipolar interface enabled)
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FUNCTION
(Figure
(Table
1-2). These outputs can
2-C).