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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AFE5808A датащи(PDF) 34 Page - Texas Instruments |
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AFE5808A датащи(HTML) 34 Page - Texas Instruments |
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34 / 66 page  AFE5808A SLOS729B – OCTOBER 2011 – REVISED APRIL 2012 www.ti.com Table 4. VCA Register Map (continued) ADDRESS ADDRESS Default FUNCTION DESCRIPTION (DEC) (HEX) Value 59[8] 0x3B[8] 0 CW_SUM_AMP_PDN 0: Power down; 1: Normal operation Note: 59[8] is only effective in TGC test mode. 59[9] 0x3B[9] 0 PGA_TEST_MODE 0: Normal CW operation; 1: PGA outputs appear at CW outputs AFE5808A VCA Register Description LNA Input Impedances Configuration (Active Termination Programmability) Different LNA input impedances can be configured through the register 52[4:0]. By enabling and disabling the feedback resistors between LNA outputs and ACTx pins, LNA input impedance is adjustable accordingly. Table 5 describes the relationship between LNA gain and 52[4:0] settings. The input impedance settings are the same for both TGC and CW paths. The AFE5808A also has 4 preset active termination impedances as described in 52[7:6]. An internal decoder is used to select appropriate resistors corresponding to different LNA gain. Table 5. Register 52[4:0] Description 52[4:0]/0x34[4:0] FUNCTION 00000 No feedback resistor enabled 00001 Enables 450 Ω feedback resistor 00010 Enables 900 Ω feedback resistor 00100 Enables 1800 Ω feedback resistor 01000 Enables 3600 Ω feedback resistor 10000 Enables 4500 Ω feedback resistor Table 6. Register 52[4:0] vs LNA Input Impedances 52[4:0]/0x34[4:0] 00000 00001 00010 00011 00100 00101 00110 00111 LNA:12dB High Z 150 Ω 300 Ω 100 Ω 600 Ω 120 Ω 200 Ω 86 Ω LNA:18dB High Z 90 Ω 180 Ω 60 Ω 360 Ω 72 Ω 120 Ω 51 Ω LNA:24dB High Z 50 Ω 100 Ω 33 Ω 200 Ω 40 Ω 66.67 Ω 29 Ω 52[4:0]/0x34[4:0] 01000 01001 01010 01011 01100 01101 01110 01111 LNA:12dB 1200 Ω 133 Ω 240 Ω 92 Ω 400 Ω 109 Ω 171 Ω 80 Ω LNA:18dB 720 Ω 80 Ω 144 Ω 55 Ω 240 Ω 65 Ω 103 Ω 48 Ω LNA:24dB 400 Ω 44 Ω 80 Ω 31 Ω 133 Ω 36 Ω 57 Ω 27 Ω 52[4:0]/0x34[4:0] 10000 10001 10010 10011 10100 10101 10110 10111 LNA:12dB 1500 Ω 136 Ω 250 Ω 94 Ω 429 Ω 111 Ω 176 Ω 81 Ω LNA:18dB 900 Ω 82 Ω 150 Ω 56 Ω 257 Ω 67 Ω 106 Ω 49 Ω LNA:24dB 500 Ω 45 Ω 83 Ω 31 Ω 143 Ω 37 Ω 59 Ω 27 Ω 52[4:0]/0x34[4:0] 11000 11001 11010 11011 11100 11101 11110 11111 LNA:12dB 667 Ω 122 Ω 207 Ω 87 Ω 316 Ω 102 Ω 154 Ω 76 Ω LNA:18dB 400 Ω 73 Ω 124 Ω 52 Ω 189 Ω 61 Ω 92 Ω 46 Ω LNA:24dB 222 Ω 41 Ω 69 Ω 29 Ω 105 Ω 34 Ω 51 Ω 25 Ω 34 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated Product Folder Link(s): AFE5808A |
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