QF1DA512-DK Quickfilter Technologies LLC, QF1DA512-DK Datasheet - Page 37

• Manufacturer Part Number: QF1DA512-DK
• Description: KIT DEV FOR QF1DA512
• Manufacturer: Quickfilter Technologies LLC
• Series: SavFIRe™r

Specifications of QF1DA512-DK

• Main Purpose: Filters, Digital Filter Design
• Embedded: Yes, ASIC
• Utilized Ic / Part: QF1Da512
• Primary Attributes: 1 512 Tap FIR Filter, 12 ~ 24 Bit
• Secondary Attributes: Quickfilter Software Design Tool GUI, Works from 10 ~ 500ksps ADC Data Rates
• For Use With: WM2582 - EVALDI EARBUDS TYPE Y686-1006 - BOARD MSP-MOJO + EXPANSION HEADR
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 686-1010

13.2 Data Format
The I2C bridge circuit must read and acknowledge the QF1Da512‟s I2C address and strip this address from the I2S/SPI command
sequence sent on to the QF1Da512 (see figure 10). The first data byte must contain the command opcode (82h for Configuration
WRITE, 83h for Configuration READ, 86h for Coefficient WRITE, or 87h for Coefficient READ) as it will be the first byte received by the
QF1Da512. The subsequent data byte(s) will contain the actual data to be written or the data being read.
14 DGC User Guidance
T = Threshold
G = Gain
R = Ratio
M = Maximum expected input value
These four parameters are used to calculate two variables used by Quickfilter‟s algorithm.
These two variables are used to compute the compressed and gained value of the input. The Multiplicor is multiplied by the input while
the Addor is added to the input to produce the output
If compression is disabled, Quickfilter Pro sets
If compression is enabled all values are set by user to the following limits
Rev A8 January 7, 2009
And the user sets the gain limited to,
Multiplicor = Gain / Ratio
Addor = Gain * Threshold * (1 – (1/Ratio))
G
T = 1
R = 1
G


M
M
1

1
T 
R
 R

R
T
M




1
16

R
1



Figure 22: I2C Addressing Protocol
PRELIMINARY DATA SHEET
37
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QF1Da512