MCP4922 MCP4921 MCP4921/4922 12-Bit DAC with SPI Interface Features Description 12-Bit Resolution The Microchip Technology Inc. MCP492X are 2.7 5.5V, low-power, low DNL, 12-Bit Digital-to-Analog Con- 0.2 LSB DNL (typ) verters (DACs) with optional 2x buffered output and SPI 2 LSB INL (typ) interface. Single or Dual Channel The MCP492X are DACs that provide high accuracy Rail-to-Rail Output and low noise performance for industrial applications SPI Interface with 20 MHz Clock Support where calibration or compensation of signals (such as Simultaneous Latching of the Dual DACs w/LDAC temperature, pressure and humidity) are required. Fast Settling Time of 4.5 s The MCP492X are available in the extended tempera- ture range and PDIP, SOIC, MSOP and TSSOP Selectable Unity or 2x Gain Output packages. 450 kHz Multiplier Mode The MCP492X devices utilize a resistive string archi- External V Input REF tecture, with its inherent advantages of low DNL error, 2.7V to 5.5V Single-Supply Operation low ratio metric temperature coefficient and fast settling Extended Temperature Range: -40C to +125C time. These devices are specified over the extended temperature range. The MCP492X include double- Applications buffered inputs, allowing simultaneous updates using Set Point or Offset Trimming the LDAC pin. These devices also incorporate a Power-On Reset (POR) circuit to ensure reliable Sensor Calibration power-up. Digitally-Controlled Multiplier/Divider Portable Instrumentation (Battery-Powered) Package Types Motor Feedback Loop Control 8-Pin PDIP, SOIC, MSOP Block Diagram V V 1 8 DD OUTA CS SDI SCK LDAC 2 7 AV CS SS V 3 6 SCK REFA V DD SDI 4 5 Power-on LDAC Interface Logic Reset AV SS Input Input 14-Pin PDIP, SOIC, TSSOP Register A Register B V 1 14 V DD OUTA NC 2 13 V REFA DAC DAC A B Register Register CS 3 12 AV SS V V REF REF V SCK 4 11 REFB B A String String 5 10 V SDI OUTB DAC DAC A B 6 9 SHDN NC Buffer Buffer 7 8 NC LDAC Gain Gain Logic Logic Output Op Amps Output Logic V V OUTA OUTB SHDN 2004 Microchip Technology Inc. DS21897A-page 1MCP4921/4922 Notice: Stresses above those listed under Maximum Rat- 1.0 ELECTRICAL ings may cause permanent damage to the device. This is a CHARACTERISTICS 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. Expo- Absolute Maximum Ratings sure to maximum rating conditions for extended periods may V ............................................................................................................. 6.5V affect device reliability. DD All inputs and outputs w.r.t ............. 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, R = 5 k DD SS REF L to GND, C = 100 pF T = -40 to +85C. Typical values at +25C. L A Parameters Sym Min Typ Max Units Conditions Power Requirements Input Voltage V 2.7 5.5 DD Input Current - MCP4921 I 175 350 A Input unbuffered, digital inputs DD Input Current - MCP4922 350 700 grounded, output unloaded, code at 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 DNL -0.75 0.2 +0.75 LSB Device is Monotonic Offset Error V 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 -0.10 1 % of FSR Code 0xFFFh, not including offset E error. Gain Error Temperature G/C -3 ppm/C Coefficient Input Amplifier (V Input) REF Input Range - Buffered Mode V 0.040 V 0.040 V Note 1 REF DD Code = 2048 Input Range - Unbuffered V 0 V V REF DD V = 0.2v p-p, f = 100 Hz and 1 kHz REF Mode Input Impedance R 165 k Unbuffered Mode VREF Input Capacitance - C 7 pF VREF Unbuffered Mode Multiplier Mode f 450 kHz V = 2.5V 0.2Vp-p, Unbuffered, VREF REF -3 dB Bandwidth G = 1 f 400 kHz V = 2.5V 0.2 Vp-p, Unbuffered, VREF REF G = 2 Multiplier Mode - THD -73 dB V = 2.5V 0.2Vp-p, VREF REF Total Harmonic Distortion Frequency = 1 kHz Note 1: By design, not production tested. 2: Too small to quantify. DS21897A-page 2 2004 Microchip Technology Inc.