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AEAS-7000-1GSG0 Datasheet(PDF) 2 Page - AVAGO TECHNOLOGIES LIMITED |
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AEAS-7000-1GSG0 Datasheet(HTML) 2 Page - AVAGO TECHNOLOGIES LIMITED |
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2 / 8 page  2 Signal-Channels A1-A11 The photocurrent of the photo diodes is fed into a trans-impedance amplifier. The analog output of the amplifier has a voltage swing of (dark/light) about 1.3 V. Every output is transformed by precision comparators into digital signals (D1-D11). The threshold is at VDD/2 (=Analog-reference), regulated by the monitor channel. Monitor Channel with LED Control at Pins LEDR and LERR The analog output signal of the monitor channel is regulated by the LED current. An internal bipolar transistor sets this level to VDD/2 (control voltage at pin LEDR). Thus the signal swing of each output is symmetrical to VDD/2 (=Analog-reference) The error bit at pin LERR is triggered if the Ve of the internal bipolar transistor is larger than VDD/2. Signals Channels A0, A09 with Signal Conditioning and Calibration These two channels give out a sine and cosine wave, which are 90 degree phase shifted. These signals have amplitudes which are almost constant due to the LED current monitoring. Due to amplifier mismatch and mechanical misalignment, the signals have gain and offset errors. These errors are eliminated by an adaptive signal conditioning circuitry. The conditioning values are on-chip preprogrammed by factory. The analog output signals of A0 and A09 are supplied as true- differential voltage with a peak to peak value of 2.0 V at the pins A09P, A09N, A0P, A0N. Interpolator for Channels A0,A09 The interpolator generates the digital signals D0,D09 and D-1 to D-4. The interpolated signals D-1 to D-4 extend the 12 bit Gray code of the signals D11….D0 to form a 16 bit Gray code. D0 and D09 are digitized from A0 and A09. The channels A0-A11 and A09 have very high dynamic bandwidth, which allows a real time monotone 12 bit Gray code at 12000 RPM. The interpolated 16 bit Gray code can be used up to 1000 RPM only. At more than 1000 RPM, only the 12 bit Gray code from the MSB side can be used. LSB Gray Code Correction (Pin KORR) This function block synchronizes the switching points for the 11 bit Gray code of the digital signals D1 to D11 with D0 and D09 (digitized signal of A0 and A09). This Gray code correction only works for the 12 bit MSB(4096 steps per revolution). The correction is not for the 4 excess interpolated bits of the 16 bit Gray code. Gray code correction can be switched on or off by putting the pin KORR =1(on) or =0(off). MSBINV and DOUT Pins The serial interface consists of a shift register. The most significant bit, MSB (D11) will always be sent first to DOUT. The MSB can be inverted (change code direction) by using pin MSBINV. DIN and NSL Pins The serial input DIN allows the configuration as ring register for multiple transmissions or for cascading 2 or more encoders. DIN is the input of the shift register that shifts the data to DOUT. The NSL pin controls the shift register, to switch it between load (1) or shift (0) mode. Under load mode, DOUT will give the logic of the MSB, i.e., D11. Under shift mode (0), coupled with the SCL, the register will be clocked, and gives out the serial word output bit by bit. As the clock frequency can be up to 16 MHz, the transmission of the full 16 bit word can be done within 1µs. Valid data of DOUT should be read when the SCL clock is low. Please refer to timing diagram (Figure 3). |
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