NJU39610 New Japan Radio, NJU39610 Datasheet
NJU39610
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NJU39610 Summary of contents
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... NJU39610 is a dual 7-bit+sign, Digital-to-Analog Converter (DAC) especially developed to be used together with the NJM3771, Precision Stepper Motor driver in micro-stepping applications. The NJU39610 has a set of input registers connected to an 8-bit data port for easy interfacing directly to a microprocessor. The NJU39610 is well suited for high- speed micro-stepping application ...
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... Digital-to-Analog 1, voltage output. Output between 0.0 V and Sign Sign 1, TTL/CMOS level connected directly to NJM3771 Phase input. 1 Databit D7 is transfered non inverted from NJU39610 data input Current Decay 1, TTL/CMOS level. The signal is automatically generated when 1 decay level is programmed. LOW level = fast current decay. ...
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... DEFINITION OF TERMS Resolution Resolution is defined as the reciprocal of the number of discrete steps in the DAC output directly related to the number of switches or bits within the DAC. For example, NJU39610 has 2 bits resolution. Remember that this is not equal to the number of microsteps available. Linearity Error Linearity error is the maximum deviation from a straight line passing through the end points of the DAC transfer characteristic ...
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... Data Bus Interface NJU39610 is designed to be compatible with 8-bit microprocessors such as the 6800, 6801, 6803, 6808, 6809, 8051, 8085, Z80 and other popular types and their 16/32 bit counter parts in 8 bit data mode. The data bus inter- face consists of 8 data bits, write signal, chip select, and two address pins. All inputs are TTL-compatible (except reset) ...
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... Figure 10. Single pulse programming, in- and output signals. Ideal data = desired position Double pulse write signal Actual data = true position Normal resolution Single pulse write signal Actual data = true position Note increased resolution "Ideal data" = desired position NJU39610 … and (Q … voltage at both DAC outputs SS . ...
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... ABSOLUTE MAXIMUM RATINGS Parameter Voltage Supply Logic inputs Reference input Current Logic inputs Temperature Storage temperature Operating ambient temperature * refers to DIP package RECOMMENDED OPERATING CONDITIONS Parameter Supply voltage Reference voltage ( @ V =5V) DD NJU39610 Pin no.* Symbol Min -0 -0 ...
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... From positive edge of Reset outputs valid 120 pF load Reset open 2.5 V Ref unloaded - V , loaded 2.5 kohm, Code 127 to DAC load Code 127 to DAC 4.75 V < V < 5. For a full-scale transition to 0.5 LSB DAC of final value 2.5 kohm, C load NJU39610 Min Typ Max 3 0 ...
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... A0-A1 D0- Sign, CD Figure 11. Timing Reset Sign, CD Figure 12. Timing of Reset DAC t pwr t res t pres NJU39610 ...
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... This is the ideal solution for a system where there is no microprocessor heavily loaded with other tasks. With a microprocessor, data is stored in ROM / RAM area or each step is successively calculated. NJU39610 is connected like any peripheral addressable device. All parts of stepping can be tailored for specific damping needs etc ...
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... Programming NJU39610 There are basically two different ways of programming the NJU39610. They are called “single-pulse programming” and “double-pulse programming.” Writing to the device can only be accomplished by addressing one register at a time. When taking one step, at least two registers are normally updated. Accordingly there must be a certain time delay between writing to the first and the second register ...
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... NJM3771 20 16 Phase Sign GND 17 300 pF 820 pF NJU39610 NJM3771 Vref MM1 MM2 STEPPER MOTOR 2 13 ...