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ML2340 データシート(PDF) 8 Page - Micro Linear Corporation |
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ML2340 データシート(HTML) 8 Page - Micro Linear Corporation |
8 / 12 page ML2340, ML2350 8 Bipolar Output Voltage Mode GAIN 1 GAIN 0 GAIN Voltage OutputP-P 00 1/4 VREF IN ¥ 1/8 01 1/2 VREF IN ¥ 1/4 101 VREF IN ¥ 1/2 112 VREF IN ¥ 1 The output buffer can source or sink as much as 10mA of current with an output voltage of at least 1V from either VCC or AGND. As the output voltage approaches VCC or AGND the current sourcing/sinking capability of the output buffer is reduced. The output buffer can still swing down to within 10mV of AGND and up to within 40mV of VCC with a 100kW load at VOUT to AGND in the unipolar operation. In the bipolar operation, the output buffer swing is limited to about 100mV from either rails. 1.5 VOLTAGE REFERENCE A bandgap voltage reference is incorporated on the ML2340 and ML2350. Two reference voltages can be produced by each device. An internal comparator monitors the power supply voltage to determine the selection of the reference voltage. A reference voltage of 2.25 volts on the ML2340 and 2.50 volts on the ML2350 is selected when the supply voltage is less than approximately 7.50 volts. Otherwise, a reference voltage of 4.50 volts and 5.00 volts is selected. To prevent the comparator from oscillating between the two selections, avoid operation with a power supply between 70 and 8.0 volts. The bandgap reference is trimmed for zero Temperature Coefficient (TC) at 35°C to minimize output voltage drift over the specified operating temperature range. The internal reference is buffered for use by the DAC and external circuits. The reference buffer will source more than 5mA of current and sink more than 1mA of current. With VREF IN connected to VREF OUT, the following output voltage ranges of the DAC are obtained: ML2340 VREF = 2.25V with VREF = 4.5V with Gain VCC - 7.0V VCC • 8.0V Setting Unipolar Bipolar Unipolar Bipolar 1/4 0 to 0.562V –0.281V to 0 to 1.125V –0.562V to +0.281V +0.562V 1/2 0 to 1.125V –0.562V to 0 to 2.250V –1.125V to +0.562V +1.125V 1 0 to 2.250V –1.125V to 0 to 4.500V –2.250V to +1.125V +2.250V 2 0 to 4.500V –2.250V to 0 to 9.000V –4.500V to +2.250V +4.500V ML2350 VREF = 2.50V with VREF = 5.0V with Gain VCC - 7.0V VCC • 8.0V Setting Unipolar Bipolar Unipolar Bipolar 1/4 0 to 0.625V –0.3125V to 0 to 1.25V –0.625V to +0.3125V +0.625V 1/2 0 to 1.250V –0.6250V to 0 to 2.50V –1.250V to +0.6250V +1.250V 1 0 to 2.500V –1.2500V to 0 to 5.00V –2.500V to +1.2500V +2.500V 2 0 to 5.000V –2.5000V to 0 to 10.00V –5.000V to +2.5000V +5.000V An external reference can alternatively be used on VREF IN to set the desired full scale voltage. The linearity of the D/A converter depends on the reference used, however. To insure integral linearity at an 8-bit level, a reference voltage of no less than 2V and no more than 7V (2.75V for operation with a low-voltage power supply) should be used. 1.6 DIGITAL INTERFACE The digital interface of the ML2340 and ML2350 consist of a transfer input (XFER) and eight data inputs, DB0 through DB7. The digital interface operates in one of the two modes: 1.6.1 Single-Buffered Mode Digital input data on DB0–DB7 is passed through an 8-bit transparent input latch on the rising edge of XFER. Because the outputs of the latch are connected directly to the inputs of the internal DAC, changes on the digital data while the XFER input is still active will cause an immediate change in the DAC output voltage. To hold the input data on the latch, the XFER input needs deactivated while the data is still stable. 1.6.2 Flow-Through Mode In the flow-through mode, the input latch is bypassed. When XFER is set to logic “1”, a change of data inputs, DB0–DB7, results in an immediate update of the output voltage. 1.7 POWER-ON-RESET The ML2340 and ML2350 have an internal power-on- reset circuit to initialize the device when power is first applied to the device. The power-on-reset interval of typically 8µs begins when the supply voltage, VCC reaches approximately 2.0V. During the power-on-reset interval, the transparent latch is reset to all “0’s”. |
同様の部品番号 - ML2340 |
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同様の説明 - ML2340 |
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