MCP4821/MCP4822 12-Bit DACs with Internal V and SPI Interface REF Features Description 12-Bit Resolution The Microchip Technology Inc. MCP482X devices are 2.7V5.5V, low-power, low DNL, 12-bit Digital-to-Analog 0.2 LSb DNL (typ.) Converters (DACs) with internal band gap voltage 2 LSb INL (typ.) reference, optional 2x-buffered output and Serial Single or Dual Channel Peripheral Interface (SPI). Rail-to-Rail Output The MCP482X family of DACs provide high accuracy SPI Interface with 20 MHz Clock Support and low noise performance for industrial applications Simultaneous Latching of the Dual DACs where calibration or compensation of signals (such as with LDAC pin temperature, pressure and humidity) are required. Fast Settling Time of 4.5 s The MCP482X devices are available in the extended temperature range and PDIP, SOIC and MSOP Selectable Unity or 2x Gain Output packages. 2.048V Internal Band Gap Voltage Reference The MCP482X devices utilize a resistive string 50 ppm/C V Temperature Coefficient REF architecture, with its inherent advantages of low DNL 2.7V to 5.5V Single-Supply Operation error, low ratio metric temperature coefficient and fast Extended Temperature Range: -40C to +125C settling time. These devices are specified over the extended temperature range. The MCP482X family Applications includes double-buffered registers, allowing simulta- pin. These devices also neous updates using the LDAC Set Point or Offset Trimming incorporate a Power-On Reset (POR) circuit to ensure Sensor Calibration reliable power-up. Precision Selectable Voltage Reference Package Types Portable Instrumentation (Battery-Powered) Calibration of Optical Communication Devices 8-Pin PDIP, SOIC, MSOP V V 1 8 DD OUTA Block Diagram 2 7 AV CS SS CS SDI SCK LDAC SHDN 3 6 SCK 4 5 V SDI LDAC DD Power-on Interface Logic Reset AV 8-Pin PDIP, SOIC, MSOP SS Input Input V V 1 8 DD OUTA Register A Register B 2.048V 2 7 AV CS SS V REF DAC DAC A B V 3 6 SCK OUTB Register Register 4 5 SDI LDAC String String DAC DAC A B Gain Gain Logic Logic Output Op Amps Output Logic V V OUTA OUTB SHDN 2005 Microchip Technology Inc. DS21953A-page 1 MCP4821 MCP4822MCP4821/MCP4822 Notice: Stresses above those listed under Maximum 1.0 ELECTRICAL Ratings may cause permanent damage to the device. This is CHARACTERISTICS a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. Absolute Maximum Ratings Exposure to maximum rating conditions for extended periods V ............................................................................................................. 6.5V may affect device reliability. DD All inputs and outputs ...................AV 0.3V to V + 0.3V SS DD Current at Input Pins ....................................................2 mA Current at Supply Pins ...............................................50 mA Current at Output Pins ...............................................25 mA Storage temperature .....................................-65C to +150C Ambient temp. with power applied ................-55C to +125C ESD protection on all pins ........... 4 kV (HBM), 400V (MM) Maximum Junction Temperature (T )..........................+150C J 5V AC/DC CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, V = 5V, AV = 0V, V = 2.048V, output buffer gain (G) = 2x, DD SS REF R = 5 k to GND, C = 100 pF, T = -40 to +85C. Typical values at +25C. L L A Parameters Sym Min Typ Max Units Conditions Power Requirements Input Voltage V 2.7 5.5 DD Input Current - MCP4821 I 330 400 A Digital inputs grounded, Output DD Input Current - MCP4822 415 750 unloaded, code = 0x000 Hardware Shutdown Current I 0.3 2 A SHDN Software Shutdown Current I 3.3 6 A SHDN SW Power-on-Reset Threshold V 2.0 V POR DC Accuracy Resolution n 12 Bits INL Error INL -12 2 12 LSb DNL (Note 1) DNL -0.75 0.2 +0.75 LSb Device is monotonic Offset Error V -1 0.02 1 % of FSR Code = 0x000h OS Offset Error Temperature V /C 0.16 ppm/C -45C to 25C OS Coefficient -0.44 ppm/C +25C to 85C Gain Error g -2 -0.10 2 % of FSR Code 0xFFFh, not including offset E error Gain Error Temperature G/C -3 ppm/C Coefficient Internal Voltage Reference (V ) REF Nominal Reference Voltage V 2.008 2.048 2.088 V V when G = 1x and REF OUTA Code = 0xFFFh Temperature Coefficient V /C 125 325 ppm/C -40C to 0C REF (Note 1) 0.25 0.65 LSb/C -40C to 0C 45 160 ppm/C 0C to +85C 0.09 0.32 LSb/C 0C to +85C Output Noise (V Noise) E 290 V Code = 0xFFFh, G = 1 REF NREF p-p (0.1-10 Hz) Output Noise Density e 1.2 V/ Hz Code = 0xFFFh, G = 1 NREF (1 kHz) e 1.0 V/ Hz Code = 0xFFFh, G = 1 NREF (10 kHz) 1/f Corner Frequency f 400 Hz CORNER Note 1: By design, not production tested. 2: Too small to quantify. DS21953A-page 2 2005 Microchip Technology Inc.