ml7037 Oki Semiconductor, ml7037 Datasheet - Page 38

• Manufacturer Part Number: ml7037
• Description: Ml7037-003 Dual Echo Canceler & Noise Canceler With Dual Codec For Hands-free
• Manufacturer: Oki Semiconductor

Not for Publication
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10. Application-level volume control on use is recommended to be made outside of the echo path such as by the
11. Turn off an echo canceller in an environment where no echoes exist.
12. When the echo path is changed (such as when resuming telephone communication), reset the device either
13. The Pin Control Mode (the MCUSEL-pin = logic ‘1’) which defines behaviors of this LSI by logic ‘0’ / ‘1’ to
OKI Semiconductor
NOTE ON USE
Use a stabilized power supply with a low level of noises (especially spike noises and pulse noises of high
frequencies) in order to prevent this device from malfunction or degradation in characteristics.
Place bypass-capacitors with a good high frequency characteristics for the power supply near the pins of this
device in order to assure its electrical characteristics.
Place bypass-capacitors with a good high frequency characteristics for the analog signal ground (AVREF
pin) near the pins of this device in order to assure its electrical characteristics.
Place bypass-capacitors with a good high frequency characteristics for the regulator’s reference voltage
output (VBG pin) and for the regulator outputs (REGOUT0,1 pins) near the pins of this device in order to
assure its electrical characteristics.
Connect the AGND0, AGND1, DGND0 and DGND 2 to the system ground at a shortest distance and in a low
impedance state.
Turn on and off the analog power supply and digital power supply simultaneously, or turn on digital power
supply prior to analog power supply and turn off analog power supply prior to digital power supply.
After turning on the power, be sure to reset the device with the PDN pin while the master clocks are being
supplied.
Set a system level diagram so that a value of the Echo Return Loss (E.R.L. = [Power of echo-originating
signals at RoutA/RoutL] – [Power of echo signals at SinA/SinL]) is negative and the ASLC function is
recommended to be enabled. When the E.R.L. cannot be negative all the time, the GLPAD function is
recommended to be enabled with the ASLC function disabled. Refer to a reference data for the E.R.L level vs.
echo attenuation of an echo canceller.
The input level should be –10 to –20 dBm0. Refer to a reference data for Rin input level vs. echo attenuation.
RALC, the RPAD and the TPAD (not between the RoutA and the SinA in the single echo canceller mode; or
not between the RoutA and the SinA nor not between the RoutL and the SinL).
in Dual Echo Canceler mode
in Signal Echo Canceler mode : to be controlled with the TPAD, the RPAD, the RALC, and/or with the
with the PDN pin, the SPDN bit [CR0-B7], the RST pin or the RST bit [CR0-B6].
concerned input pins has less flexibility in comparison with the External MCU Mode (the MCUSEL-pin =
logic ‘0’) which defines behaviors of this LSI through control register setting due to its limitation of the
available pin count. Therefore, basically, this LSI is recommended to use in the External MCU Mode.
: to be controlled with the TPAD, the RPAD, and/or the RALC.
analog input (LINN) that is set at less than 1.3 VPP.
PEDL7037-003-05Zz_Digest
ML7037-003
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