IDT82P2282PF IDT, Integrated Device Technology Inc, IDT82P2282PF Datasheet - Page 94

• Manufacturer Part Number: IDT82P2282PF
• Description: TXRX T1/J1/E1 2CHAN 100-TQFP
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Transceiverr

Specifications of IDT82P2282PF

• Number Of Drivers/receivers: 2/2
• Protocol: IEEE 1149.1
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 100-TQFP, 100-VQFP
• Screening Level: Industrial
• Pin Count: 100
• Mounting: Surface Mount
• Package Type: TQFP
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 82P2282PF

corresponding to two kinds of cable impedance. The selection is made
by the PULS[3:0] bits. In internal impedance matching mode, if the cable
impedance is 75 Ω, the PULS[3:0] bits should be set to ‘0000’; if the
cable impedance is 120 Ω, the PULS[3:0] bits should be set to ‘0001’. In
external impedance matching mode, for both 75 Ω and 120 Ω cable
impedance, the PULS[3:0] bits should be set to ‘0001’.
3.24.2
should be attenuated before transmission to prevent the cross-talk in the
far end. Three LBOs are used to implement the pulse attenuation. Four
grades of attenuation with each step of 7.5 dB are specified in the FCC
Part 68 Regulations. The attenuation grade is selected by the PULS[3:0]
bits. The details are listed in Table 61.
3.24.3
haul applications and long haul applications if the PULS[3:0] bits are set
to ‘11XX’ in the corresponding link. This allows the transmitter perfor-
mance to be tuned for a wide variety of line condition or special applica-
tion.
by the UI[1:0] bits, and each UI is divided into 16 sub-phases addressed
by the SAMP[3:0] bits. The pulse amplitude of each phase is repre-
sented by a binary byte, within the range from +63 to -63, stored in the
WDAT[6:0] bits in signed magnitude form. The maximum number +63
(D) represents the positive maximum amplitude of the transmit pulse
while the most negative number -63 (D) represents the maximum nega-
tive amplitude of the transmit pulse. Thus, up to 64 bytes are used. For
each channel, a 64 bytes RAM is available.
ROM. One of them can be selected as reference and made some
changes to get the desired waveform.
is the most similar to the desired pulse shape, from the following 12
tables (Table 62 to Table 73), and set the SCAL[5:0] bits to the corre-
sponding standard value. Table 62 to Table 73 list the sample data and
the standard scaling value of each of the 12 templates.
transmit pulse shape. By increasing or decreasing by ‘1’ from the stan-
dard value in the SCAL[5:0] bits, the pulse amplitude can be scaled up
or down at the percentage ratio against the standard pulse amplitude if
necessary. For different pulse shapes, the value of the SCAL[5:0] bits
IDT82P2282
Table 61: LBO PULS[3:0] Setting In T1 Mode
To meet the template, two preset waveform templates are provided
In long haul applications, the output on the TTIPn/TRINGn pins
User-programmable arbitrary waveform can be used in both short
Each pulse shape can extend up to 4 UIs (Unit Interval) addressed
There are twelve standard templates which are stored in a local
To do this, the first step is to choose a set of waveform value, which
Modifying the corresponding sample data can get the desired
Cable Configuration
LINE BUILD OUT (LBO) (T1 ONLY)
USER-PROGRAMMABLE ARBITRARY WAVEFORM
-15.0 dB LBO
-22.5 dB LBO
-7.5 dB LBO
0 dB LBO
PULS[3:0]
0 0 1 0
1 0 0 1
1 0 1 0
1 0 1 1
94
and the scaling percentage ratio are different. The values are listed in
Table 62 to Table 73.
grammed based on the selected waveform template:
bits;
be stored in the RAM, addressed by the selected UI and the correspond-
ing sample address;
from RAM;
read from the internal RAM).
tude of the waveform based on the selected standard pulse amplitude.
templates and LBOs in details for reference. For preset pulse templates
and LBOs, scaling up/down against the pulse amplitude is not sup-
ported.
DUAL T1/E1/J1 LONG HAUL / SHORT HAUL TRANSCEIVER
Do the followings step by step, the desired waveform can be pro-
1. Select the UI by the UI[1:0] bits;
2. Specify the sample address in the selected UI by the SAMP[3:0]
3. Write sample data to the WDAT[6:0] bits. It contains the data to
4. Set the RW bit to ‘0’ to write data to RAM, or to ‘1’ to read data
5. Set the DONE bit to implement the read or write operation;
(Repeat the above steps until all the sample data are written to or
6. Write the scaling data to the SCAL[5:0] bits to scale the ampli-
Table 62 to Table 73 give all the sample data based on preset pulse
1. Table 62 - Transmit Waveform Value For E1 75 Ω
2. Table 63 - Transmit Waveform Value For E1 120 Ω
3. Table 64 - Transmit Waveform Value For T1 0~133 ft
4. Table 65 - Transmit Waveform Value For T1 133~266 ft
5. Table 66 - Transmit Waveform Value For T1 266~399 ft
6. Table 67 - Transmit Waveform Value For T1 399~533 ft
7. Table 68 - Transmit Waveform Value For T1 533~655 ft
8. Table 69 - Transmit Waveform Value For J1 0~655 ft
9. Table 70 - Transmit Waveform Value For DS1 0 dB LBO
10. Table 71 - Transmit Waveform Value For DS1 -7.5 dB LBO
11. Table 72 - Transmit Waveform Value For DS1 -15.0 dB LBO
12. Table 73 - Transmit Waveform Value For DS1 -22.5 dB LBO
August 20, 2009