LMV1089RLEVAL National Semiconductor, LMV1089RLEVAL Datasheet - Page 15

• Manufacturer Part Number: LMV1089RLEVAL
• Description: BOARD EVALUATION LMV1089
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LMV1089RLEVAL

• Main Purpose: Audio, Microphone Amp
• Embedded: No
• Utilized Ic / Part: LMV1089
• Primary Attributes: Dual Input, Single Output
• Secondary Attributes: Graphical User Interface, I²C Interface
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

NOTE: Data guaranteed by design
Creating the Three Tone Sequence with an AWG
It is possible to create the three tone test sequence as de-
scribed in Performing a Three Tone Calibration with an Arbi-
trary Waveform Generator (AWG) For this the sequence
should be programmed in the memory of the AWG. The se-
quence should consist of:
•
•
•
•
201 cycles 1 kHz sine wave (duration 201 ms)
67 cycles 300 kHz sine wave (duration 201 ms)
603 cycles 3 kHz sine wave (duration 201 ms)
A few milliseconds silence (optional)
Symbol
t
t
t
t
t
t
t
ST1
ET1
ST2
ET2
ST3
ET3
CC
Calibration Start Tone 1
Calibration End Tone 1
Calibration Start Tone 2
Calibration End Tone 2
Calibration Start Tone 3
Calibration End Tone 3
Calibration Complete
FIGURE 19. Example of Three Tone Signal Generation
TABLE 5. Automatic Calibration Timing Parameters
Parameter
15
The level of these tones must all be equal and excite the out-
put of the generator sufficient (50 — 100% relative amplitude)
so the noise of the DAC in the generator will not have a neg-
ative contribution to the calibration process. The period time
for this sequence will be 603mS + the length of the additional
programmed' 'few milliseconds silence'.
A signal applied to the microphones before the CAL signal
goes 'high' is ignored by the automatic calibration system.
A possible setup for generation of the three tone test signal is
shown in the drawing Figure 19.
Min
200
400
600
790
Limits
Max
210
410
10
Unitis
300606r6
www.national.com
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