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SP9501KS Datasheet(PDF) 4 Page - Sipex Corporation |
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SP9501KS Datasheet(HTML) 4 Page - Sipex Corporation |
4 / 9 page SP9501DS/02 SP9501 12-Bit, Low-Power Voltage Output © Copyright 2000 Sipex Corporation 4 THEORY OF OPERATION The SP9501 consists of four main functional blocks – the input shift register, DAC register, 12-Bit D/A converter and a bipolar output volt- age amplifier, Figure 1. The input shift register is used to convert the serial input data stream to a parallel 12–Bit digital word. The input data is shifted on posi- tive clock (SCLK) edges when the Chip Select (CS) signal is in the “low” state. The MSB is loaded first and LSB last. No shifting of the input data occurs when the Chip Select (CS) signal is in the “high” state. The DAC register is used to store the digital word which is sent to the DAC. Its value is updated on the positive transition of the Chip Select (CS) signal. In order to reduce the DAC full scale output sensitivity to the large weighting of the MSB's found in conventional R-2R resistor ladders, the 3 MSB's are decoded into 8 equally weighted levels. This reduces the contribution of each bit by a factor of 4, thus, reducing the output sensi- tivity to mismatches in resistors and switches by the same amount. Linearity errors and stability are both improved for the same reasons. The DAC itself is implemented with precision thin-film resistors and CMOS transmission gate switches. The resistor network is laser-trimmed to achieve better than 12–Bit accuracy. The D/ A converter is used to convert the 12-bit input word to a precision voltage. Table 1. Offset Binary Coding 2 V REF 2 12 INPUT OUTPUT MSB LSB 1111 1111 1111 V REF - 1 LSB 1111 1111 1110 V REF - 2 LSB 1000 0000 0001 0 + 1 LSB 1000 0000 0000 0 0000 0000 0001 -V REF + 1 LSB 0000 0000 0000 -V REF 1 LSB = FEATURES... The SP9501 is a low power 12–Bit Digital-to- Analog Converter. The converter features ±4.5V output swings with ±5V supplies. The input coding format used is standard offset binary, Table 1. This Digital-to Analog Converter uses a stan- dard 3–wire interface compatible with SPI™, QSPI™ and Microwire™. The output settling time is specified at 4 µs to full 12-bit accuracy when driving a 5K Ω, 50pF load combination. The SP9501 Digital-to-Analog Converter is ideally suited for applications such as ATE, process controllers, robotics and instrumenta- tion. The SP9501 is available in an 8-pin 0.15" SOIC and 0.3" PDIP packages, specified over commercial and industrial temperature ranges. VOUT 1 2 3 4 8 7 6 5 VDD DIN VREF VSS CS GND SCLK SP9501 PINOUT – 8-PIN PLSTIC DIP & SOIC PIN ASSIGNMENTS Pin 1- V OUT - Voltage Output. Pin 2- V DD - +5V Power Supply Input. Pin 3- SCLK - Serial Clock Input. Pin 4- D IN - Serial Data Input. Pin 5- CS - Chip Select Input. Pin 6 - V SS - –5V Power Supply Input. Pin 7- GND - Ground. Pin 8- V REF - Reference Input. |
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