MCP3550/1/3 Low-Power, Single-Channel 22-Bit Delta-Sigma ADCs PDF
Preview MCP3550/1/3 Low-Power, Single-Channel 22-Bit Delta-Sigma ADCs
MCP3550/1/3 Low-Power, Single-Channel 22-Bit Delta-Sigma ADCs Features Description • 22-bit ADC in Small 8-pin MSOP Package with The Microchip Technology Inc. MCP3550/1/3 devices Automatic Internal Offset and Gain Calibration are 2.7V to 5.5V low-power, 22-bit Delta-Sigma Ana- (cid:129) Low-Output Noise of 2.5µV with Effective log-to-Digital Converters (ADCs). The devices offer RMS Resolution of 21.9 bits (MCP3550/1) output noise as low as 2.5µVRMS, with a total unadjusted error of 10ppm. The family exhibits 6ppm (cid:129) 3µV Typical Offset Error Integral Non-Linearity (INL) error, 3µV offset error and (cid:129) 2ppm Typical Full-Scale Error less than 2ppm full-scale error. The MCP3550/1/3 (cid:129) 6ppm Maximum INL Error devices provide high accuracy and low noise (cid:129) Total Unadjusted Error Less Than 10ppm performance for applications where sensor (cid:129) No Digital Filter Settling Time, Single-Command measurements (such as pressure, temperature and Conversions through 3-wire SPI Interface humidity) are performed. With the internal oscillator (cid:129) Ultra-Low Conversion Current (MCP3550/1): and high oversampling rate, minimal external components are required for high-accuracy - 100µA typical (V = 2.7V) DD applications. - 120µA typical (V = 5.0V) DD This product line has fully differential analog inputs, (cid:129) Differential Input with V to V Common Mode SS DD making it compatible with a wide variety of sensor, Range industrial control or process control applications. (cid:129) 2.7V to 5.5V Single-Supply Operation The MCP3550/1/3 devices operate from -40°C to (cid:129) Extended Temperature Range: +125°C and are available in the space-saving 8-pin - -40°C to +125°C MSOP and SOIC packages. Applications Package Types: (cid:129) Weigh Scales MCP3550/1/3 (cid:129) Direct Temperature Measurement SOIC, MSOP (cid:129) 6-digit DVMs (cid:129) Instrumentation VREF 1 8 VDD (cid:129) Data Acquisition V + 2 7 CS IN (cid:129) Strain Gauge Measurement V – 3 6 SDO/RDY IN Block Diagram VSS 4 5 SCK VREF VSSVDD Device Selection Table Sample Effective 50/60Hz VVININ+- 3DMwCr/aSod Il d-inAbOutrDelraadrCtnteioo arrnl 4SINC al Interface SSRCDDKOY MMPaCCrPPt 33N55u55m00--b56e00r 112R5.5astspepss R22e11s..o99l ubbtiiittossn Re56j00ecHHtizzo n eri CS MCP3551 13.75sps 21.9 bits 50/60Hz S Internal VDD (simultaneous) Oscillator MCP3553 60sps 20.6 bits N/A POR © 2007 Microchip Technology Inc. DS21950D-page 1 MCP3550/1/3 1.0 ELECTRICAL † Notice: Stresses above those listed under "Maximum 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 1.1 Maximum Ratings* operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect V ...................................................................................7.0V DD device reliability. All inputs and outputs w.r.t V .............. -0.3V to V + 0.3V SS DD Difference Input Voltage .......................................|V - V | DD SS Output Short Circuit Current .................................Continuous Current at Input Pins ....................................................±2mA Current at Output and Supply Pins ............................±10mA Storage Temperature.....................................-65°C to +150°C Ambient temp. with power applied................-55°C to +125°C ESD protection on all pins (HBM, MM) ............≥ 6kV, ≥ 400V Maximum Junction Temperature (T )..........................+150°C J DC CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, all parameters apply at -40°C ≤ T ≤ +85°C, V = 2.7V or 5.0V. A DD V = 2.5V. V + = V - = V = V /2. All ppm units use 2*V as full-scale range. Unless otherwise noted, specification REF IN IN CM REF REF applies to entire MCP3550/1/3 family. Parameters Sym Min Typ Max Units Conditions Noise Performance (MCP3550/1) No Missing Codes NMC 22 — — bits At DC (Note5) Output Noise e — 2.5 — µV N RMS Effective Resolution ER — 21.9 — bits RMS V = 5V REF Noise Performance (MCP3553) No Missing Codes NMC 20 — — bits At DC (Note5) Output Noise e — 6 — µV N RMS Effective Resolution ER — 20.6 — bits RMS V = 5V REF Conversion Times MCP3550-50 t -1.0% 80 +1.0% ms CONV MCP3550-60 t -1.0% 66.67 +1.0% ms CONV MCP3551 t -1.0% 72.73 +1.0% ms CONV MCP3553 t -1.0% 16.67 +1.0% ms CONV Accuracy Integral Non-Linearity INL — ±2 6 ppm T = +25°C only (Note2) A Offset Error V -12 ±3 +12 µV T = +25°C OS A — ±4 — µV T = +85°C A — ±6 — µV T = +125°C A Positive Full-Scale Error V -10 ±2 +10 ppm T = +25°C only FS,P A Negative Full-Scale Error V -10 ±2 +10 ppm T = +25°C only FS,N A Offset Drift — 0.040 — ppm/°C Positive/Negative Full-Scale Error — 0.028 — ppm/°C Drift Note 1: This parameter is established by characterization and not 100% tested. 2: INL is the difference between the endpoints line and the measured code at the center of the quantization band. 3: This current is due to the leakage current and the current due to the offset voltage between V + and V -. IN IN 4: Input impedance is inversely proportional to clock frequency; typical values are for the MCP3550/1 device. V =5V. REF 5: Characterized by design, but not tested. 6: Rejection performance depends on internal oscillator accuracy; see Section4.0 “Device Overview” for more informa- tion on oscillator and digital filter design. MCP3550/1 device rejection specifications characterized from 49 to 61Hz. DS21950D-page 2 © 2007 Microchip Technology Inc. MCP3550/1/3 DC CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise indicated, all parameters apply at -40°C ≤ T ≤ +85°C, V = 2.7V or 5.0V. A DD V = 2.5V. V + = V - = V = V /2. All ppm units use 2*V as full-scale range. Unless otherwise noted, specification REF IN IN CM REF REF applies to entire MCP3550/1/3 family. Parameters Sym Min Typ Max Units Conditions Rejection Performance(1,6) Common Mode DC Rejection — -135 — dB V range from 0 to V CM DD Power Supply DC Rejection — -115 — dB Common Mode 50/60Hz Rejection CMRR — -135 — dB V varies from 0V to V CM DD Power Supply 50/60Hz Rejection PSRR — -85 — dB MCP3551 only, V varies from DD 4.5V to 5.5V Power Supply 50/60Hz Rejection PSRR — -120 — dB MCP3550-50 or MCP3550-60 only at 50 or 60Hz respectively, V DD varies from 4.5V to 5.5V Normal Mode 50 and 60Hz NMRR — -85 — dB MCP3551 only, Rejection 0 < V < V , CM DD -V < V = (V + -V -) < +V REF IN IN IN REF Normal Mode 50 or 60Hz NMRR — -120 — dB MCP3550-50 or MCP3550-60 only Rejection at 50 or 60Hz respectively, 0 < V < V , CM DD -V < V = (V + -V -) < +V REF IN IN IN REF Analog Inputs Differential Input Range V − V -V — +V V IN+ IN- REF REF Absolute/Common Mode Voltages V - 0.3 — V + 0.3 V SS DD Analog Input Sampling Capacitor — 10 — pF Note5 Differential Input Impedance — 2.4 — MΩ Shutdown Mode Leakage Current — 1 — nA V + = V - = V ; CS = V IN IN DD DD (Note3) Reference Input Voltage Range 0.1 — V V DD Reference Input Sampling — 15 — pF Note5 Capacitor Reference Input Impedance — 2.4 — MΩ Note4 Shutdown Mode Reference — 1 — nA V + = V - = V ; CS = V IN IN SS DD Leakage Current Power Requirements Power Supply Voltage Range V 2.7 — 5.5 V DD MCP3550-50, MCP3551 Supply I — 120 170 µA V = 5V DD DD Current — 100 — µA V = 2.7V DD MCP3550-60, MCP3553 Supply I — 140 185 µA V = 5V DD DD Current — 120 — µA V = 2.7V DD Supply Current, Sleep Mode I — 10 µA DDSL Supply Current, Shutdown Mode I — — 1 µA CS = SCK = V DDS DD Serial Interface Voltage Input High (CS, SCK) V 0.7V — — V IH DD Voltage Input Low (CS, SCK) V — — 0.4 V IL Voltage Output High (SDO/RDY) V V - 0.5 — — V V = 1mA, V = 5.0V OH DD OH DD Note 1: This parameter is established by characterization and not 100% tested. 2: INL is the difference between the endpoints line and the measured code at the center of the quantization band. 3: This current is due to the leakage current and the current due to the offset voltage between V + and V -. IN IN 4: Input impedance is inversely proportional to clock frequency; typical values are for the MCP3550/1 device. V =5V. REF 5: Characterized by design, but not tested. 6: Rejection performance depends on internal oscillator accuracy; see Section4.0 “Device Overview” for more informa- tion on oscillator and digital filter design. MCP3550/1 device rejection specifications characterized from 49 to 61Hz. © 2007 Microchip Technology Inc. DS21950D-page 3 MCP3550/1/3 DC CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise indicated, all parameters apply at -40°C ≤ T ≤ +85°C, V = 2.7V or 5.0V. A DD V = 2.5V. V + = V - = V = V /2. All ppm units use 2*V as full-scale range. Unless otherwise noted, specification REF IN IN CM REF REF applies to entire MCP3550/1/3 family. Parameters Sym Min Typ Max Units Conditions Voltage Output Low (SDO/RDY) V — — 0.4 V V = -1mA, V = 5.0V OL OH DD Input leakage Current I -1 — 1 µA LI (CS, SCK) Internal Pin Capacitance C — 5 — pF Note1 INT (CS, SCK, SDO/RDY) Note 1: This parameter is established by characterization and not 100% tested. 2: INL is the difference between the endpoints line and the measured code at the center of the quantization band. 3: This current is due to the leakage current and the current due to the offset voltage between V + and V -. IN IN 4: Input impedance is inversely proportional to clock frequency; typical values are for the MCP3550/1 device. V =5V. REF 5: Characterized by design, but not tested. 6: Rejection performance depends on internal oscillator accuracy; see Section4.0 “Device Overview” for more informa- tion on oscillator and digital filter design. MCP3550/1 device rejection specifications characterized from 49 to 61Hz. TEMPERATURE CHARACTERISTICS Electrical Specifications: Unless otherwise indicated Parameters Sym Min Typ Max Units Conditions Temperature Ranges Specified Temperature Range T -40 — +85 °C A Operating Temperature Range T -40 — +125 °C A Thermal Package Resistances Thermal Resistance, 8L-MSOP θ — 206 — °C/W JA Thermal Resistance, 8L-SOIC θ — 163 — °C/W JA SERIAL TIMINGS Electrical Specifications: Unless otherwise indicated, all parameters apply at -40°C ≤ T ≤ +85°C, A V = 3.3V or 5.0V, SDO load = 50pF. DD Parameters Sym Min Typ Max Units Conditions CLK Frequency f — — 5 MHz SCK CLK High t 90 — — ns HI CLK Low t 90 — — ns LO CLK fall to output data valid t 0 — 90 ns DO CS low to indicate RDY state t 0 — 50 ns RDY CS minimum low time t 50 — — ns CSL RDY flag setup time t 20 — — ns SU CS rise to output disable t 20 — — ns DIS CS disable time t 90 — — ns CSD Power-up to CS LOW t — 10 — µs PUCSL CS High to Shutdown Mode t — 10 — µs CSHSD DS21950D-page 4 © 2007 Microchip Technology Inc. MCP3550/1/3 t RDY t CSHSD t CSD CS tCSL t DIS SDO /RDY tDO fSCK t t HI LO t SCK SU FIGURE 1-1: Serial Timing. t V PUCSL DD CS FIGURE 1-2: Power-up Timing. © 2007 Microchip Technology Inc. DS21950D-page 5 MCP3550/1/3 2.0 TYPICAL PERFORMANCE CURVES Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. Note: Unless otherwise specified, T = +25°C, V = 5V, V = 2.5V, V = 0V, V = V /2, V + = V -. A DD REF SS CM REF IN IN All ppm units use 2*V as full-scale range.Unless otherwise noted, graphs apply to entire MCP3550/1/3 family. REF 5 10 4 +125 C 3 8 2 +85 C m) m) 1 pp 6 NL (pp -10 -40 C Error ( 4 I -2 +25 C NL -3 I 2 -4 -5 0 -2.5 -1.5 -0.5 0.5 1.5 2.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 V (V) V (V) IN REF FIGURE 2-1: INL Error vs. Input Voltage FIGURE 2-4: Maximum INL Error vs. (V = 2.7V). V . DD REF 5 10 4 +125 C 9 3 +85 C 8 2 m) 7 INL (ppm) --2101 +25 C- 40 C Max INL (pp 3456 -3 2 -4 1 -5 0 -2.5 -1.5 -0.5 0.5 1.5 2.5 -50 -25 0 25 50 75 100 125 VIN (V) Temperature (°C) FIGURE 2-2: INL Error vs. Input Voltage FIGURE 2-5: Maximum INL Error vs. (V = 5.0V). Temperature. DD 10 10 8 L (ppm) -20246 ++18255 C C oise (µV)RMS 56789 MCP3553 N +25 C N 4 I -4 -40 C ut 3 MCP3550/1 -6 p -8 Out 12 -10 0 -5 -4 -3 -2 -1 0 1 2 3 4 5 -2.5 -1.5 -0.5 0.5 1.5 2.5 VIN (V) VIN (Volts) FIGURE 2-3: INL Error vs. Input Voltage FIGURE 2-6: Output Noise vs. Input (V = 5.0V, V = 5V). Voltage (V = 2.7V). DD REF DD DS21950D-page 6 © 2007 Microchip Technology Inc. MCP3550/1/3 Note: Unless otherwise specified, T = +25°C, V = 5V, V = 2.5V, V = 0V, V = V /2, V + = V -. A DD REF SS CM REF IN IN All ppm units use 2*V as full-scale range. Unless otherwise noted, graphs apply to entire MCP3550/1/3 family. REF 15 10 )S 9 RM )MS 8 µV 10 VR 7 se ( MCP3553 e (µ 6 MCP3553 put Noi 5 MCP3550/1 put Nois 345 MCP3550/1 ut ut 2 O O 1 0 0 -2.5 -1.5 -0.5 0.5 1.5 2.5 -50 -25 0 25 50 75 100 125 VIN (V) Temperature (°C) FIGURE 2-7: Output Noise vs. Input FIGURE 2-10: Output Noise vs. Voltage (V = 5.0V). Temperature. DD u 10.0 5 9.0 )MS 8.0 4 R V 7.0 ut Noise (µ 3456....0000 MCP3553 MCP3550/1 Offset (µV) 23 p ut 2.0 1 O 1.0 0.0 0 0.0 1.0 2.0 3.0 4.0 5.0 2.5 3 3.5 4 4.5 5 5.5 V (V) V (V) REF DD FIGURE 2-8: Output Noise vs. V . FIGURE 2-11: Offset Error vs V REF DD (V =0V). CM 7 10 )S 9 6 RM 8 5 oise (µV 567 MCP3553 set (µV) 34 put N 34 MCP3550/1 Off 2 ut 2 1 O 1 0 0 -50 -25 0 25 50 75 100 125 2.5 3 3.5 4 4.5 5 5.5 VDD (V) Temperature (°C) FIGURE 2-9: Output Noise vs.V . FIGURE 2-12: Offset Error vs. DD Temperature (V = 5.0V). REF © 2007 Microchip Technology Inc. DS21950D-page 7 MCP3550/1/3 Note: Unless otherwise specified, T = +25°C, V = 5V, V = 2.5V, V = 0V, V = V /2, V + = V -. A DD REF SS CM REF IN IN All ppm units are ratioed against 2*V Unless otherwise noted, graphs apply to entire MCP3550/1/3 family. REF . 5 4000 pm) 34 Positive Full-Scale nces 33050000 VVVDRCDEMF == = 51 2V.2.55VV Error (p 012 Occurre 22050000 V1cT6oAIN 3n= =8s 24e05 cVCutive Full-Scale ----4321 Negative Full-Scale Number of 11505000000 readings -5 0 2.5 3 3.5 4 4.5 5 5.5 -15 -10 -5 0 5 10 15 VDD (V) Output Code (LSB) FIGURE 2-13: Full-Scale Error vs. V . FIGURE 2-16: MCP3550/1 Output Noise DD Histogram. 10 1800 m) 68 es1600 VVDRDEF = = 5 2V.5V or (pp 24 Positive Full-Scale urrenc11240000 VVTACIN M= = = 20 51V°.2C5V ale Err -20 of Occ1800000 1re6a3d8i4n gcosnsecutive ull-Sc --64 Negative Full-Scale mber 460000 F -8 Nu 200 -10 0 -50 -25 0 25 50 75 100 125 -15 -10 -5 0 5 10 15 Temperature (°C) Output Code (LSB) FIGURE 2-14: Full-Scale Error vs. FIGURE 2-17: MCP3553 Output Noise Temperature. Histogram. 5.0 10 4.0 8 m) 6 3.0 or (pp 24 Positive Full-Scale pm) 12..00 Scale Err --420 Negative Full-Scale TUE (p --210...000 Full- --86 --43..00 -10 -5.0 -50 -25 0 25 50 75 100 125 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 Temperature (°C) V (V) IN FIGURE 2-15: Full-Scale Error vs. FIGURE 2-18: Total Unadjusted Error Temperature (V = 5.0V). (TUE) vs. Input Voltage (V = 2.7V). REF DD DS21950D-page 8 © 2007 Microchip Technology Inc. MCP3550/1/3 Note: Unless otherwise specified, T = +25°C, V = 5V, V = 2.5V, V = 0V, V = V /2, V + = V -. A DD REF SS CM REF IN IN All ppm units use 2*V as full-scale range.Unless otherwise noted, graphs apply to entire MCP3550/1/3 family. REF 5 6 4 3 m) 5 p m) 12 E (p 4 p U E (p 0 m T 3 TU -1 mu 2 -2 xi -3 Ma 1 -4 0 -5 -50 -25 0 25 50 75 100 125 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 VIN (V) Temperature (°C) FIGURE 2-19: Total Unadjusted Error FIGURE 2-22: Maximum TUE vs. (TUE) vs. Input Voltage. Temperature. 10 5 8 4.5 6 4 TUE (ppm) --42024 TUE (ppm) 123...52535 -6 1 -8 0.5 -10 0 -5 -4 -3 -2 -1 0 1 2 3 4 5 2.5 2.7 3 3.3 4 5 5.5 V (V) V (V) IN DD FIGURE 2-20: Total Unadjusted Error FIGURE 2-23: Maximum TUE vs. V . DD (TUE) vs. Input Voltage (V = 5.0V). REF 10 0.6 9 m) 8 0.5 pp 7 0.4 MCP3550/1 UE ( 6 A) 0.3 um T 45 (µDDS 0.2 MCP3553 m 3 I 0.1 xi Ma 2 0 1 0 -0.1 0 1 2 3 4 5 -50 -25 0 25 50 75 100 125 V (V) Temperature (°C) REF FIGURE 2-21: Maximum TUE vs. V . FIGURE 2-24: I vs. Temperature. REF DDS © 2007 Microchip Technology Inc. DS21950D-page 9 MCP3550/1/3 Note: Unless otherwise specified, T = +25°C, V = 5V, V = 2.5V, V = 0V, V = V /2, V + = V -. A DD REF SS CM REF IN IN All ppm units use 2*V as full-scale range.Unless otherwise noted, graphs apply to entire MCP3550/1/3 family. REF 200 160 180 140 MCP3550-60, MCP3553 160 MCP3550-50, MCP3550/1 140 MCP3550-60, MCP3553 120 A) 120 A) 100 I (µDD 18000 MCP3550-50, MCP3550/1 I (µDD 6800 60 40 40 20 20 0 0 2.5 3 3.5 4 4.5 5 5.5 -50 -25 0 25 50 75 100 125 VDD (V) Temperature (°C) FIGURE 2-25: I vs. V . FIGURE 2-26: I vs. Temperature. DD DD DD DS21950D-page 10 © 2007 Microchip Technology Inc.
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