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WM2636 Datasheet(PDF) 1 Page - Wolfson Microelectronics plc |
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WM2636 Datasheet(HTML) 1 Page - Wolfson Microelectronics plc |
1 / 10 page WM2636 12-bit Serial Input Voltage Output DAC with Internal Reference Production Data, July 1999, Rev 1.0 WOLFSON MICROELECTRONICS LTD Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK Tel: +44 (0) 131 667 9386 Fax: +44 (0) 131 667 5176 Email: sales@wolfson.co.uk http://www.wolfson.co.uk Production Data contain final specifications current on publication date. Supply of products conforms to Wolfson Microelectronics’ Terms and Conditions. 1999 Wolfson Microelectronics Ltd . FEATURES • 12-bit voltage output DAC • Single supply from 2.7V to 5.5V • DNL ±0.5 LSBs, INL ±2.0 LSBs • Very low power consumption (3V supply): - 4.2mW, slow mode - 8.1mW, fast mode • TMS320, (Q)SPI, and Microwire compatible serial interface • Programmable settling time of 3.5µs or 1µs typical • High impedance reference input buffer • Power down mode 10nA APPLICATIONS • Battery powered test instruments • Digital offset and gain adjustment • Battery operated/remote industrial controls • Machine and motion control devices • Wireless telephone and communication systems • Speech synthesis • Arbitrary waveform generation ORDERING INFORMATION DEVICE TEMP. RANGE PACKAGE WM2636CD 0° to 70°C 8-pin SOIC WM2636ID -40° to 85°C 8-pin SOIC DESCRIPTION The WM2636 is a 12-bit voltage output, resistor string digital-to- analogue converter that can be powered down under software control. Power down reduces current consumption to 10nA. An internal precision voltage reference is provided which can source up to 1mA. This can therefore be used as an external system reference. The device has been designed to interface efficiently to industry standard microprocessors and DSPs, including the TMS320 family. The WM2636 is programmed with a 16-bit serial word comprising 4 control bits and 12 data bits. Excellent performance is delivered with a typical DNL of 0.5 LSBs. The settling time of the DAC is programmable to allow the designer to optimize speed versus power dissipation. The output stage is buffered by a x2 gain near rail-to-rail amplifier. The device is available in an 8-pin SOIC package. Commercial temperature (0 ° to 70°C) and Industrial temperature (-40° to 85 °C) variants are supported. BLOCK DIAGRAM TYPICAL PERFORMANCE (7) OUT 12-BIT DAC LATCH POWER-ON RESET DIN (1) SCLK (2) FS (4) (5) AGND VDD (8) POWERDOWN/ SPEED CONTROL 2-BIT CONTROL LATCH REFERENCE INPUT BUFFER 16-BIT SHIFT REGISTER AND CONTROL LOGIC data X1 X2 DAC OUTPUT BUFFER NCS (3) 2-BIT REFERENCE SELECT LATCH 1.024V/2.048V SELECTABLE REFERENCE X1 REFERENCE OUTPUT BUFFER WITH OUPUT ENABLE REF(6) WM2636 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 0 512 1024 1536 2048 2559 3071 3583 4095 DIGITAL CODE VDD = 5V, VREF = External, Speed = Fast mode, Load = 10k/100pF |
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