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AM6012D Datasheet(PDF) 5 Page - NXP Semiconductors |
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AM6012D Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 11 page Philips Semiconductors Linear Products Product specification AM6012 12-Bit multiplying D/A converter August 31, 1994 780 DIFFERENTIAL LINEARITY COMPARISON Figure 1. Differential Linearity Comparison ±1/2LSB INL, ±1LSB DNL ±2LSB INL, ±1LSB DNL 0000 0010 0100 0110 1000 1010 1100 1110 0001 0011 0101 0111 1001 1011 1101 1111 IDEAL OUTPUTS ACUTAL OUTPUTS +1/2LSB LIMIT 2LSB CHANGE ON X011–X100 TRANSITION SEGMENT OF 12-BIT DAC TRANSFER CURVE FOR: NO CHANGE ON XX01–XX10 TRANSITION –1/2LSB LIMIT DIGITAL INPUT INL = ±1/2LSB DNL = ±1LSB 0010 0010 0100 0110 1000 1010 1100 1110 0001 0011 0101 0111 1001 1011 1101 1111 DNL = ±ℑ√2LSB INL = ±2LSB SEGMENT OF 12-BIT DAC TRANSFER CURVE FOR: –2 LSB LIMIT SEGMENT CHANGE IDEAL OUTPUTS ACUTAL OUTPUTS SEGMENT CHANGE +2LSB LIMIT DIGITAL INPUT ANALOG OUTPUT CURRENTS Both true and complemented output sink currents are provided where IO+IO=IFR. Current appears at the “true” output when a “1” is applied to each logic input. As the binary count increases, the sink current at Pin 18 increases proportionally, in the fashion of a “positive logic” D/A converter. When a “0” is applied to any input bit, that current is turned off at Pin 18 and turned on at Pin 19. A decreasing logic count increases IO as in a negative or inverted logic D/A converter. Both outputs may be used simultaneously. If one of the outputs is not required, it must still be connected to ground or to a point capable of sourcing IFR; do not leave an unused output pin open. Both outputs have an extremely wide voltage compliance enabling fast direct current-to-voltage conversion through a resistor tied to ground or other voltage source. Positive compliance is 25V above V- and is independent of the positive supply. Negative compliance is +10V above V-. The dual outputs enable double the usual peak-to-peak load swing when driving loads in quasi-differential fashion. This feature is especially useful in cable driving, CRT deflection and in other balanced applications such as driving center-tapped coils and transformers. POWER SUPPLIES The AM6012 operates over a wide range of power supply voltages from a total supply of 20V to 36V. When operating with V- supplies of -10V or less, IREF≤1mA is recommended. Low reference current operation decreases power consumption and increases negative compliance, reference amplifier negative common-mode range, negative logic input range, and negative logic threshold range; consult the various figures for guidance. For example, operation at -9V with IREF=1mA is not recommended because negative output compliance would be reduced to near zero. Operation from lower supplies is possible, however at least 8V total must be applied to insure turn-on of the internal bias network. Symmetrical supplies are not required, as the AM6012 is quite insensitive to variations in supply voltage. Battery operation is feasible as no ground connection is required; however, an artificial ground may be used to insure logic swings, etc., remain between acceptable limits. TEMPERATURE PERFORMANCE The nonlinearity and monotonicity specifications of the AM6012 are guaranteed to apply over the entire rated operating temperature range. Full-scale output current drift is tight, typically ±10ppm/°C, with zero-scale output current and drift essentially negligible compared to 1/2LSB. The temperature coefficient of the reference resistor R14 should match and track that of the output resistor for minimum overall full-scale drift. SETTLING TIME The AM6012 is capable of extremely fast settling times, typically 250ns at IREF=1.0mA. Judicious circuit design and careful board layout must be employed to obtain full performance potential during |
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