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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DAC1282IPW датащи(PDF) 17 Page - Texas Instruments |
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DAC1282IPW датащи(HTML) 17 Page - Texas Instruments |
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17 / 43 page  DAC1282 www.ti.com SBAS490 – DECEMBER 2011 The digital gain resolution is in 0.5-dB increments, from 0 dB to full mute and is programmed by the SINEG[7:0] register bits. Table 4 lists the digital gain setting. Equation 2 is the amplitude setting in sine mode. Sine Amplitude (dB) = Analog Gain (dB) + Digital Gain (dB) (2) Best SNR, for a given signal level, is achieved by reducing the analog gain while maximizing the digital gain. Table 4. Sine Mode Digital Gain SINE MODE DIGITAL GAIN (dB) SINEG[7:0] REGISTER BITS 0 0000 0000 –0.5 0000 0001 –1.0 0000 0010 — — –119.5 1110 1111 Full mute 1111 0000 Full mute 1111 xxxx Full mute 1111 1111 DC Mode The DAC1282 provides a dc output mode with 24-bit available resolution. The output level is determined by the analog gain and the 24-bit dc registers. The GAIN[2:0] register bits set the analog gain (see Table 3). The DCG[23:0] register bits set the 24-bit level over the selected analog range. Table 5 lists the digital gain settings in dc mode. Table 5. DC Mode Digital Gain Settings DIFFERENTIAL OUTPUT VOLTAGE (V)(1) DCG[23:0] REGISTER BITS +2.5 x Gain 7FFFFFh +1.25 x Gain 3FFFFFh 0 0 –1.25 x Gain C00000h –2.5 x Gain 800001h (1) VREF = 5 V. Ideal output voltage excluding gain, offset, linearity and noise errors.. Copyright © 2011, Texas Instruments Incorporated Submit Documentation Feedback 17 Product Folder Link(s): DAC1282 |
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