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WM2632 Datasheet(PDF) 1 Page - Wolfson Microelectronics plc |
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WM2632 Datasheet(HTML) 1 Page - Wolfson Microelectronics plc |
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WM2632 Octal 8-bit, Serial Input, Voltage Output DAC with Internal Reference Production Data, April 2001, Rev 1.1 WOLFSON MICROELECTRONICS LTD Bernard Terrace, Edinburgh, EH8 9NX, UK Tel: +44 (0) 131 667 9386 Fax: +44 (0) 131 667 5176 Email: sales@wolfson.co.uk www.wolfsonmicro.com Production Data datasheets contain final specifications current on publication date. Supply of products conforms to Wolfson Microelectronics’ Terms and Conditions. 2001 Wolfson Microelectronics Ltd . FEATURES • Eight 8-bit DACs in one package • Dual supply 2.7V to 5.5V operation • DNL ±0.1 LSBs, INL ±0.3 LSBs typical • Programmable settling time / power (1.0 µs typical in fast mode) • Internal programmable voltage reference • Microcontroller compatible serial interface • Power down mode ( < 0.1µA) • Monotonic over temperature • Data output for daisy chaining APPLICATIONS • Battery powered test instruments • Digital offset and gain adjustment • Battery operated / remote industrial controls • Programmable loop controllers • CNC machine tools • Machine and motion control devices • Wireless telephone and communication systems • Robotics ORDERING INFORMATION DEVICE TEMP. RANGE PACKAGE WM2632CDT 0 ° to 70°C 20-pin TSSOP WM2632IDT -40 ° to 85°C 20-pin TSSOP DESCRIPTION The WM2632 is an octal, 8-bit, resistor string digital-to- analogue converter. The eight individual DACs contained in the IC can be switched in pairs between fast and slow (low power) operation modes, or powered down, under software control. Alternatively, the whole device can be powered down, reducing current consumption to less than 0.1 µA. The DAC outputs are buffered by a rail-to-rail amplifier with a gain of two, which is configurable as Class A (fast mode) or Class AB (for low-power mode). The WM2632 has been designed to interface directly to industry standard microprocessors and DSPs, and can operate on two separate analogue and digital power supplies. It is programmed with a 16-bit serial word comprising 4 address bits and up to 12 DAC or control register data bits. All eight DACs can be simultaneously forced to a preset value using a preset input pin. A daisy-chain data output makes it possible to control several of Wolfson’s octal DACs from the same interface, without increasing the number of control lines. The device is available in a 20-pin TSSOP package. Commercial temperature (0° to 70°C) and Industrial temperature (-40° to 85°C) variants are supported. BLOCK DIAGRAM TYPICAL PERFORMANCE LATCH POWER/SPEED CONTROL RESISTOR STRING (12) OUT A DAC A DIN (2) SCLK (3) FS (4) PREB (5) 1.024V / 2.048V SELECTABLE REFERENCE DOUT (19) REF (16) DACs B, C, D, E, F, G, H as DAC A (6-9, 13-15) OUT B to H REF SERIAL INTERFACE AND CONTROL LOGIC MODE (17) AVDD (11) DVDD (20) AGND (10) DGND (1) LOADB (18) -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 0 32 64 96 128 160 192 224 256 DIGITAL CODE |
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