WM5615ID

WM5615 Production Data January 1997 Rev 2 10-Bit Digital-to-Analogue Converter Description The WM5615 is a 10-bit voltage output digital-toanalogue converter (DAC) with a buffered reference input (high impedance). The DAC produces a maximum output voltage that is twice the reference voltage and the DAC is monotonic. The device is simple to use, running from a single supply of 5V. A power-on reset function is incorporated to ensure repeatable start-up conditions. Digital control of the WM5615 is over a 3-wire serial bus that is CMOS compatible and easily interfaced to industry standard microprocessor and microcontroller devices. The device receives a 16-bit data word to produce the analogue output. The digital inputs feature Schmitt triggers for high noise immunity. Digital communication protocols include the SPI TM, QSPITM and MicrowireTM standards. The 8-terminal small-outline D package allows digital control of analogue functions in space-critical applications. The WM5615C is characterised for operation from 0oC to 70oC. The WM5615I is for operation from -40oC to 85oC. SPI and QSPI are trademarks of Motorola, Inc. Microwire is a trademark of National Semiconductor Corp. Features • • • • • • • • • • • 10-bit CMOS voltage output DAC in an 8-terminal package 5V single supply operation 3-wire serial interface High-impedance reference input Maximum voltage output twice reference input voltage Internal power-on reset Low power consumption ... 1.75mW max 877kHz update rate Setting time to 0.5 LSB ... 12.5µs typical Monotonic over temperature Pin compatible with the Maxim MAX515 Applications • • • • • Battery-powered test Instruments Digital offset and gain adjustment Battery-operated/remote industrial controls Machine and motion control devices Cellular telephones Block Diagram + REFIN 5 VOUT R R VDD + AGND POWER-ON RESET RESISTOR STRING DAC - 10-BIT DAC REGISTER CS SCLK 2 Xs DIN CONTROL LOGIC (LSB) (MSB) 4 DUMMY BITS DOUT 16-BIT SHIFT REGISTER Production Data d ata sheets contain final specifications current on publication date. Supply of products conforms to Wolfson Microelectronics standard terms and conditions. Wolfson Microelectronics Lutton Court, Bernard Terrace, Edinburgh EH8 9NX. UK © 1996 Wolfson Microelectronics Tel: +44 (0) 131 667 9386 Fax: +44 (0) 131 667 5176 email: admin@wolfson.co.uk www: http://www.wolfson.co.uk WM5615 Pin Configuration D or P package Top View DIN 1 SCLK 2 CS 3 DOUT 4 8 V DD 7 VOUT 6 REFIN 5 AGND Ordering Information DEVICE WM5615CD WM5615CP WM5615ID WM5615IP TEMP RANGE 0oC to +70oC 0oC to +70oC -40oC to +85oC -40oC to +85oC PACKAGE 8 pin SO 8 pin DIP 8 pin SO 8 pin DIP Absolute Maximum Ratings Supply voltage (VDD to AGND) . . . . . . . . . . . . 7V Digital input voltage range to AGND . .-0.3V to VDD +0.3V Ref. input voltage range to AGND . . .-0.3V to VDD + 0.3V Output voltage at OUT from external source . .V DD + 0.3V Continuous current, any terminal . . . . . . . . ±20mA Operating free-air temperature range T A: WM5615C . . . . . . . . . . . . . . . . . . 0 oC to +70o C WM5615I . . . . . . . . . . . . . . . . . -40o C to +85o C Storage temperature range Tstg . . . . . -65o C to +150oC Lead temperature 1.6mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . .260o C Note: Stresses beyond those listed under 'Absolute Maximum Ratings' may cause damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under 'Recommended Operating Conditions' is not implied. Exposure to absolute maximum rated conditions for extended periods may affect device reliability. Recommended Operating Conditions PARAMETER Supply voltage High-level digital input voltage Low-level digital input voltage Reference voltage to REFIN terminal Load resistance Operating free air temperature SYMBOL VDD VIH VIL Vref RL TA TA MIN 4.5 2.4 0 2 0 -40 TYP 5 MAX 5.5 0.8 VDD -2 70 85 UNIT V V V V kΩ o C o C 2.048 WM5615C WM5615I Wolfson Microelectronics 2 W M5615 Electrical Characteristics Static DAC Specifications PARAMETER Resolution Integral nonlinearity Differential nonlinearity Zero scale error (offset error) Zero scale error (offset error) temperature coefficient Gain error Gain error temperature coefficient Power-supply rejection ratio Analogue full scale output SYMBOL INL DNL EZS (see (see (see (see CONDITIONS note note note note 1) 2) 3) 4) MIN 10 +0.1 3 ±3 1 0.1 0.1 2Vref(1023/1024) ±1 ±0.5 ±3 TYP MAX UNIT bits LSB LSB LSB ppm/oC LSB ppm/oC LSB/V V (over recommended operating free-air temperature range) VDD = 5.0V ±5%, Vref = 2.048V unless otherwise stated. EG (see note 5) (see note 6) Offset (see notes 7 and 8) Gain RL = 100k Ω PSRR Notes: 1. The relative accuracy or integral nonlinearity (INL), sometimes referred to as linearity error, is the maximum deviation ot the output from the line between zero and full scale, excluding the effect of zero code and full scale errors (see text). 2. The differential nonlinearity (DNL), sometimes referred to as differential error, is the difference between the measured and ideal LSB amplitude change of any two adjacent codes. Monotonic means the output voltage changes in the same direction (or remains constant) as a change in the digital input code. 3. Zero-scale error is the deviation from zero voltage output when the digital input is zero (see text) 4. Zero-scale error temperature coefficient is given by EZS TC = [EZS (Tmax) - EZS (Tmin )] /Vref x 106/ (TmaxTmin) 5. Gain error is the deviation from the ideal output (Vref - 1LSB) with an output load of 10kΩ, excluding the effects of zero error. 6. Gain temperature coefficient is given by EG TC = [EG (Tmax) - EG (Tmin)] /V ref x 106/(Tmax-Tmin). 7. Zero-scale offset error rejection ratio (E ZS-RR) is measured by varying the V DD from 4.5V to 5.5V DC and measuring the proportion of this signal imposed on the zero-code output voltage. 8. Gain error rejection ratio (EG-RR) is measured by varying the VDD from 4.5 to 5.5 V DC and measuring the proportion of this signal imposed on the full-scale output voltage after subtracting the zero scale change. Voltage Output (OUT) PARAMETER Voltage output range Output load regulation accuracy Output short circuit current Output voltage, low level Output voltage, high level SYMBOL VO IOSC VOL(low) V OH(high) CONDITIONS RL = 10k Ω VO(OUT) = 2V RL=2kΩ OUT to VDD or AGND IO (OUT)