PCM1870_16 Datasheet, PDF (41/54 Pages) Texas Instruments – Microphone Bias and Microphone Amplifier

PCM1870
www.ti.com
SLAS544A – MAY 2007 – REVISED SEPTEMBER 2007
Registers 97–100
B15 B14 B13 B12 B11 B10 B9 B8
Register 97 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0
Register 98 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0
Register 99 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0
Register 100 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0
B7
F107
F115
F207
F215
B6
F106
F114
F206
F214
B5
F105
F113
F205
F213
B4
F104
F112
F204
F212
B3
F103
F111
F203
F211
B2
F102
F110
F202
F210
B1
F101
F109
F201
F209
B0
F100
F108
F200
F208
IDX[6:0]: 110 0001b (61h) Register 97
IDX[6:0]: 110 0010b (62h) Register 98
IDX[6:0]: 110 0011b (63h) Register 99
IDX[6:0]: 110 0100b (64h) Register 100
F[107:100]: Lower 8 Bits of Coefficient a₁ for First-Stage Notch Filter
F[115:108]: Upper 8 Bits of Coefficient a₁ for First-Stage Notch Filter
F[207:200]: Lower 8 Bits of Coefficient a₂ for First-Stage Notch Filter
F[215:208]: Upper 8 Bits of Coefficient a₂ for First-Stage Notch Filter
Default value: 0000 0000
These bits are used to change the characteristics of the first-stage notch filter. See Calculating Filter Coefficients
for details.
Registers 101–104
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
Register 101 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 S107 S106 S105 S104 S103 S102 S101 S100
Register 102 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 S115 S114 S113 S112 S111 S110 S109 S108
Register 103 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 S207 S206 S205 S204 S203 S202 S201 S200
Register 104 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 S215 S214 S213 S212 S211 S210 S209 S208
IDX[6:0]: 110 0101b (65h) Register 101
IDX[6:0]: 110 0110b (66h) Register 102
IDX[6:0]: 110 0111b (67h) Register 103
IDX[6:0]: 110 1000b (68h) Register 104
S[107:100]: Lower 8 Bits of Coefficient a₁ for Second-Stage Notch Filter
S[115:108]: Upper 8 Bts of Coefficient a₁ for Second-Stage Notch Filter
S[207:200]: Lower 8 Bits of Coefficient a₂ for Second-Stage Notch Filter
S[215:208]: Upper 8 Bits of Coefficient a₂ for Second-Stage Notch Filter
Default value: 0000 0000
These bits are used to change the characteristics of the second-stage notch filter. See Calculating Filter
Coefficients for details.
Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): PCM1870
Submit Documentation Feedback
41