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AD7112CR bảng dữ liệu(PDF) 11 Page - Analog Devices |
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AD7112CR bảng dữ liệu(HTML) 11 Page - Analog Devices |
11 / 12 page AD7112 REV. 0 –11– OUTPUT INPUT VARIABLE GAIN ELEMENT 1/2 AD7112 D UP/DOWN COUNTER U VREF END STOP AND CONTROL LOGIC DETECTOR COMPARATOR Figure 21. Automatic Gain Control System Programmable State Variable Filter The AD7112 with its multiplying capability and fast settling time is ideal for many types of signal conditioning applications. The circuit of Figure 22 shows its use in a state variable filter design. This type of filter has three outputs: low pass, bandpass and high pass. The particular version shown in Figure 22 uses two AD7112 to control the critical parameters f0, Q and A0. In- stead of several fixed resistors, the circuit uses the DAC equiva- lent resistances as circuit elements. Thus, R1 in Figure 22 is controlled by the 8-bit word loaded to DAC A1 of the AD7112. This is also the case with R2, R3 and R4. DAC Equivalent Resistance, REQ = RDAC 10 × EXP (–0.375 × N /20) where: RDAC is the DAC ladder resistance. N is the DAC code in Decimal (0 ≤N≤240). DACs A1 and B1 control the gain and Q of the filter character- istic while DACs A2 and B2 control the cutoff frequency. Circuit equations: C1 = C2, R3 = R4, R7 = R8. Resonant frequency, f0 = 1/(2 π R3C1). Quality factor, Q = (R6/R8) × (R2/R FBB1). RFBB1 is the feedback resistance of DAC B1 in Figure 22 Bandpass Gain, A0 = –R2/R1. Programmable range for component values shown is f0 = 0 kHz to 15 kHz and Q = 0.3 to 4.5. DATA 2 OUT A AD7112 DAC A1 (R1) VIN A RFB B C3 10pF VIN NOTES 1. A1, A2, A3, A4 : 1/4 x AD713 2. C3 IS A COMPENSATION CAPACITOR TO ELIMINATE Q AND GAIN VARIATIONS CAUSED BY AMPLIFIER GAIN BANDWIDTH LIMITATIONS HIGH PASS OUTPUT OUT B DAC B1 (R2) BANDPASS OUTPUT VIN B LOW-PASS OUTPUT R7 30k Ω R8 30k Ω R6 10k Ω C1 1000pF C2 1000pF R5 DB0–DB7 CS WR DAC A/ DAC B DATA 1 DAC A2 (R3) DAC B2 (R4) A1 OUT A AD7112 VIN A OUT B VIN B DB0–DB7 CS WR DAC A/ DAC B A2 A3 A4 Figure 22. Programmable State Variable Filter |
Số phần tương tự - AD7112CR |
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Mô tả tương tự - AD7112CR |
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