Specifications

DATA SHEET QF4A512
Rev D4, Dec 07 47 www.quickfiltertech.com
Description: Enable FIR operation, filter 1.
fir_0_0_bypass
0 = In-circuit
*1 = Bypassed
Description: Bypasses the FIR filter (filter 0).
33h AREC_1_GAIN (AREC gain control)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Address 33h D7 D6 D5 D4 D3 D2 D1 D0
34h AREC_1_GAIN (AREC gain control)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Address 34h D15 D14 D13 D12 D11 D10 D9 D8
Description: AREC gain control, default value = 4000. This is a function of the CIC “R” value and along with CIC_SHIFT (3Ah) is
calculated automatically by the Quickfilter Pro software.
35h CHPC_1_DIV (Chopper divider setting)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Address 35h D7 D6 D5 D4 D3 D2 D1 D0
36h CHPC_1_DIV (Chopper divider setting)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Address 36h D15 D14 D13 D12 D11 D10 D9 D8
Description: Sets the frequency for the chopper circuit. Default value = 0, which turns off the chopper circuit. When a value is written
here the chopper frequency is equal to the ADC_CLK divided by this value.
37h CIC_1_R (CIC decimation, R value)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Address 37h D7 D6 D5 D4 D3 D2 D1 D0
38h CIC_1_R (CIC decimation, R value)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Address 38h D15 D14 D13 D12 D11 D10 D9 D8
39h CIC_1_R (CIC decimation, R value)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Address 39h X X X X X X X D16
Description: CIC decimation rate factor minus 1 (R-1), default value = 8. Effective sampling rate for the channel is the ADC_CLK
divided by (Number of channels * 4). See Section 7.2)
3Ah CIC_1_SHIFT (CIC shift)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0