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IC-TW4QFN24 Datasheet(PDF) 2 Page - IC-Haus GmbH |
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IC-TW4QFN24 Datasheet(HTML) 2 Page - IC-Haus GmbH |
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2 / 14 page  iC-TW4 PROGRAMMABLE INTERPOLATOR WITH AUTOMATIC OFFSET CORRECTION Rev D1, Page 2/14 DESCRIPTION iC-TW4, operating on single-ended supplies of 3.3 V to 5 V, is a low cost interpolation device featuring an automatic signal conditioning and differential en- coder quadrature outputs for cable drive. The chip is pin configured with four external resis- tors and needs no micro controller or EEPROM for operation or configuration. An adaptive algorithm is used to automatically cancel sensor and input ampli- fier offset voltages, therefore eliminating the need for cumbersome system calibration. The pin configuration selects for the interpolation be- tween factors of x2 and x64, and adapts the input gain to cope with differential sensor signals between 10 mVpp to 1.5 Vpp. The interpolation engine accepts two differential si- nusoidal input signals (sine and cosine) to produce a highly interpolated incremental output signal. Sensor bridges are directly interfaced with no external com- ponents required. iC-TW4 can also operate on single-ended input sig- nals when tying the negative input terminals to the signal reference, usually VDD/2. The index gating inputs can interface a wide range of index sensors, a Hall switch or MR bridge sensor, for instance. iC-TW4 generates the index pulse for every sine/cosine signal period that is released by the gat- ing signal. The pulse output is one increment wide and is located at the positive crossover of the A ver- sus the B inputs. By swapping pins PINA and NINA or pins PINB and NINB it is possible to achieve any desired phase relationship of the Z output versus the A and B outputs, respectively. The device also supports a variety of test modes for device verification and production test. A built in power-on-reset circuit keeps the device in reset mode until the applied power supply voltage permits reliable operation. CONTENTS PACKAGES 3 ABSOLUTE MAXIMUM RATINGS 4 THERMAL DATA 4 ELECTRICAL CHARACTERISTICS 5 INPUT STAGE 7 Programmable Gain Amplifier . . . . . . . . . 7 Automated Offset Adjustment . . . . . . . . . 7 Limits of Automated Offset Adjustment . . . . 7 CONFIGURATION 8 Interpolation . . . . . . . . . . . . . . . . . . 8 Performance . . . . . . . . . . . . . . . . . . 9 Amplification . . . . . . . . . . . . . . . . . . 9 Test Modes . . . . . . . . . . . . . . . . . . . 9 INDEX GATING 10 Calibration Mode . . . . . . . . . . . . . . . . 11 START UP 12 TYPICAL APPLICATIONS 13 |
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