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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AFE4490 데이터시트(PDF) 55 Page - Texas Instruments |
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AFE4490 데이터시트(HTML) 55 Page - Texas Instruments |
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55 / 69 page  AFE4400 www.ti.com SBAS601D – DECEMBER 2012 – REVISED MAY 2013 TIA_AMB_GAIN: Transimpedance Amplifier and Ambient Cancellation Stage Gain Register (Address = 21h, Reset Value = 0000h) D23 D22 D21 D20 D19 D18 D17 D16 D15 D14 D13 D12 STAGE2 0 0 0 0 AMBDAC[3:0] 0 0 0 EN D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 0 STG2GAIN[2:0] CF_LED[4:0] RF_LED[2:0] This register configures the ambient light cancellation amplifier gain, cancellation current, and filter corner frequency. Bits D[23:20] Must be '0' Bits D[19:16] AMBDAC[3:0]: Ambient DAC value These bits set the value of the cancellation current. 0000 = 0 µA (default after reset) 1000 = 8 µA 0001 = 1 µA 1001 = 9 µA 0010 = 2 µA 1010 = 10 µA 0011 = 3 µA 1011 = Do not use 0100 = 4 µA 1100 = Do not use 0101 = 5 µA 1101 = Do not use 0110 = 6 µA 1110 = Do not use 0111 = 7 µA 1111 = Do not use Bit D15 Must be '0' Bit D14 STAGE2EN: Stage 2 enable 0 = Stage 2 is bypassed (default after reset) 1 = Stage 2 is enabled with the gain value specified by the STG2GAIN[2:0] bits Bits D[13:11] Must be '0' Bits D[10:8] STG2GAIN[2:0]: Stage 2 gain setting 000 = 0 dB, or linear gain of 1 (default after reset) 001 = 3 dB, or linear gain of 1.414 010 = 6 dB, or linear gain of 2 011 = 9 dB, or linear gain of 2.818 100 = 12 dB, or linear gain of 4 101 = Do not use 110 = Do not use 111 = Do not use Bits D[7:3] CF_LED[4:0]: Program CF for LEDs 00000 = 5 pF (default after reset) 00100 = 25 pF + 5 pF 00001 = 5 pF + 5 pF 01000 = 50 pF + 5 pF 00010 = 15 pF + 5 pF 10000 = 150 pF + 5 pF Note that any combination of these CF settings is also supported by setting multiple bits to '1'. For example, to obtain CF = 100 pF, set D[7:3] = 01111. Bits D[2:0] RF_LED[2:0]: Program RF for LEDs 000 = 500 k Ω 100 = 25 k Ω 001 = 250 k Ω 101 = 10 k Ω 010 = 100 k Ω 110 = 1 M Ω 011 = 50 k Ω 111 = None Copyright © 2012–2013, Texas Instruments Incorporated Submit Documentation Feedback 55 Product Folder Links: AFE4400 |
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