82V1074PF IDT, Integrated Device Technology Inc, 82V1074PF Datasheet - Page 40

• Manufacturer Part Number: 82V1074PF
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82V1074PF

• Number Of Channels: 4
• On-hook Transmission: Yes
• Polarity Reversal: Yes
• On-chip Ring Relay Driver: Yes
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: -40C to 85C
• Package Type: TQFP
• Operating Temperature Classification: Industrial
• Pin Count: 100
• Mounting: Surface Mount
• Operating Current: 95mA
• Operating Supply Voltage (max): 3.465V
• Operating Supply Voltage (min): 3.135V
• Lead Free Status / RoHS Status: Not Compliant

3.9
3.9.1
short circuits, broken lines, leakage currents, noise etc. Service
providers must be able to perform line tests and respond quickly if there
are any failures.
equipment to accomplish line tests. The RSLIC-CODEC chipset
provides integrated test and diagnosis functions (ITDF) that can monitor
and diagnose line faults and line card device failures without test relays
or test equipment. With the ITDF implemented, the chipset increases the
test possibilities, reduces the testing time and cost and provides more
flexibility for system manufacturers and service providers over traditional
solutions.
3.9.2
chipset to accomplish various diagnosis functions. The CODEC
generates an appropriate test signal, applies it to the loop, measures the
resulting voltage or current signal level and reports the result to a master
microprocessor. All the tests can be initiated by the microprocessor and
results can be read back very easily. By monitoring the subscriber loop,
the ITDF might prevent any problems caused by the subscriber line or
line equipment from affecting the service.
functions:
3.9.3
RSLIC & CODEC CHIPSET
Subscriber lines are often affected by many types of failures, e.g.,
Traditional line cards solutions usually need external relays and test
A set of signal generators and features are implemented in the
The chipset can accomplish the following test and measurement
• Loop resistance
• Leakage current Tip/Ring
• Leakage current Tip/GND
• Leakage current Ring/GND
• Ringer capacitance
• Line capacitance
• Line capacitance Tip/GND
• Line capacitance Ring/GND
• External voltage measurement Tip/GND
• External voltage measurement Ring/GND
• External voltage measurement Tip/Ring
• Measurement of ringing voltage
• Measurement of line feed current
• Measurement of supply voltage VDD of the CODEC
• Measurement of transversal and longitudinal currents
The signal generators available on the chipset are as follows:
• Constant DC voltage generation (programmable ringing DC offset
• Two independent tone generators (TG1 and TG2) per channel
• Ramp generator (used for capacitance measurement, refer to
• Ring generator (used to generate an internal balanced ringing
voltages);
(used to generate DTMF signal and various test tones. Please
refer to
page 47
signal. Refer to
for details).
ITDF
INTRODUCTION
DIAGNOSIS AND TEST FUNCTIONS
INTEGRATED SIGNAL GENERATORS
“3.7.1 Tone Generator” on page 30
for details);
“3.4.1.1 Internal Ringing Generation” on page 23
for details);
40
3.9.4
accomplishes all test and diagnosis functions.
following page shows the entire level meter block diagram.
3.9.4.1
in register GREG16 select one of the channels for level metering. For
each channel, there are one AC signal source and ten DC signal
sources to be selected. The LM_SRC and DC_SRC bits in register
LREG8 and the LM_SEL[3:0] bits in register LREG9 make the selection.
See
Table - 13 Level Meter Source Selection
default. When the CODEC works in active mode, it automatically adjusts
the DC feeding according to the DC voltage on the VTDC pin. So,
selecting inputs VL, IO3, IO4, IO3-IO4, DCN-DCP or VDD/2 as the level
meter source may disturb the DC feeding regulation and cause
problems in the DC loop. To avoid this, users can freeze the output of
the DC loop before selecting these inputs as the sources by setting the
ACTIVE bit in LREG6 to 0.
transmit path (VTAC) is selected for level metering.
active voice signal is being processed (see
filtered, A/D converted and decimated, the signal can be filtered by a
programmable filter. The LM_FILT bit LREG8 determines whether the
filter is enabled. If the filter is enabled, the LM_NOTCH bit in LREG8
determines which filter characteristic (notch or bandpass) is selected.
selected by the LM_N and LM_B bits in LREG5.
LM_SRC
An on-chip level meter together with the signal generators mentioned
The level meter is shared by all four channels. The LM_CS[1:0] bits
Attention: The VTDC is selected as the level meter source by
• AC Level Meter
If the LM_SRC bit in register LREG8 is set to 1, the AC signal in the
The AC level meter can measure the voice signal at 8 kHz while the
LM_FILT = 0:
LM_FILT = 1:
LM_NOTCH = 0: notch filter characteristic is selected;
LM_NOTCH = 1: bandpass filter characteristic is selected.
The filter coefficients can be from the Coe-RAM or from the ROM, as
LM_N = 0:
Table - 13
1
0
0
0
0
0
0
0
0
0
0
DC_SRC
LEVEL METER
Level Meter Source Selection
for details.
0
1
1
1
1
1
1
1
1
1
x
the filter is disabled (normal operation);
the filter is enabled;
the coefficient in the Coe-RAM is used for the
notch filter;
LM_SEL[3:0]
IDT82V1671/IDT82V1671A, IDT82V1074
0000
0100
1001
1010
1011
1100
1101
xxxx
xxxx
1110
1111
AC signal in transmit path (VTAC)
Digital DC signal
DC voltage on VTDC (default)
DC output voltage on DCN-DCP
DC voltage on VL
Voltage on IO3
Voltage 0n IO4
Voltage on RTIN
VDD/2
Offset voltage (VCM is selected)
Voltage on IO4-IO3
Figure -
Level Meter Source
Figure - 21
21). After being pre-
on the