82V1074PF IDT, Integrated Device Technology Inc, 82V1074PF Datasheet - Page 43

• 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

is sent to registers GREG17 & GREG18 after every integration period.
To calculate the measured signal level, a factor LM
LM_CN[10:0] in registers GREG15 & GREG16).
Shift Factor”
3.9.4.4
high byte of it are stored in registers GREG17 and GREG18
respectively.
Table - 14 Level Meter Result Value Range
3.9.4.5
integration width is 27 bits, a shift factor is necessary to avoid generating
an overflow in result registers and make the results with maximum
accuracy. The shift factor K
Table - 15
RSLIC & CODEC CHIPSET
In both continuous and single modes, the level meter result LM
The number of samples N
Where, LM_CN is the level meter count number (set by bits
Then the signal level can be calculated by the following formula:
Where, K
The level meter result is a 16-bit 2's complement. The low byte and
As the level meter result is a 16-bit 2's complement while the
− Full scale
Udbm0
− 32768
0x8000
Negative Value Range
for details.
INT
for details.
Table - 14
Level Meter Result Register
Level Meter Shift Factor
=
20
is the selected shift factor. Refer to
×
log
0xFFFF
shows the range of the result value.
− 1


LM
N
LM
INT
Samples
Samples
Result
Result
is programmed by register LREG9. See
= LM_CN
=
for the integrator is calculated by:
×
LM
---------------------- -
---------------------------------------------- -
2
32768
×
Value
K
Positive Value Range
0
0
INT
×
π
Result
N
“3.9.4.5 Level Meter
Samples
is defined as:
+ Full scale
+ 32768
0x7FFF


+
3.14
Value
43
Table - 15 Shift Factor Selection
3.9.4.6
compared with a programmable threshold. If the absolute value of the
result exceeds the threshold, the OTHRE bit in register LREG10 will be
set to 1.
It is programmed by the LM_TH[2:0] bits in LREG10. Refer to
for details.
Table - 16 Level Meter Threshold Setting
Once the level meter result is latched in the result registers, it will be
This threshold is a percentage value of the full scale (see
LM_TH[2]
0
0
0
0
1
1
1
1
K[3:0] bits in LREG9
Level Meter Threshold Setting
1011 to 1111
LM_TH[2:0] in LREG10
0000
0001
0010
0100
0101
1000
1001
1010
0011
0110
0111
LM_TH[1]
IDT82V1671/IDT82V1671A, IDT82V1074
0
0
1
1
0
0
1
1
LM_TH[0]
0
1
0
1
0
1
0
1
K
K
Shift Factor
K
K
K
K
K
K
INT
INT
K
K
K
INT
INT
INT
K
INT
INT
INT
INT
INT
INT
INT
= 1/1024
= 1/2048
= 1/128
= 1/256
= 1/512
= 1/16
= 1/32
= 1/64
= 1/2
= 1/4
= 1/8
= 1
Threshold
12.5%
25.0%
37.5%
50.0%
62.5%
75.0%
87.5%
Table -
0%
Table - 16
14).