Datasheet MCP41XXX/42XXX (Microchip) - 7

MCP41XXX/42XXX 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 indicated, curve represents 10 kΩ, 50 kΩ and 100 kΩ devices, VDD = 5V, V = 0V, T SS A = +25°C, V = 0V. B
1 14 )
V Ω DD = +3V to +5V
) 12 R
Ω
AB 0.8 10 0.6 8 RWB Code = 80h 0.4 6 RWB RWA 4 0.2 Nominal Resistance (k 2 Normalized Resistance ( MCP41010, MCP42010 (10 k
Ω
potentiometers) 0 0 0 32 64 96 128 160 192 224 256 -40 -25 -10 5 20 35 50 65 80 95 110 125 Code (Decimal) Temperature (°C) FIGURE 2-1:
Normalized Wiper to End
FIGURE 2-4:
Nominal Resistance 10 kΩ Terminal Resistance vs. Code. vs. Temperature.
0.5 70
T
0.4
A = -40°C to +85°C
)
Refer to Figure 2-25 Ω
60 0.3 RAB 0.2 50 0.1 40 0 -0.1 30 R -0.2 WB 20 Code = 80h -0.3 10 -0.4 Nominal Resistance (k MCP41050, MCP42050 (50 k
Ω
potentiometers) Potentiometer INL Error (LSB) -0.5 0 0 32 64 96 128 160 192 224 256 -40 -25 -10 5 20 35 50 65 80 95 110 125 Code (Decimal) Temperature (°C) FIGURE 2-2:
Potentiometer INL Error vs.
FIGURE 2-5:
Nominal Resistance 50 kΩ Code. vs. Temperature.
70 140 TA = -40°C to +85°C ) 60 VA = 3V
Ω
120 50 R 100 AB 40 80 RWB 30 Code = 80h 60 20 (ppm / °C) 40 10 0 20 Nominal Resistance (k MCP41100, MCP42100 (100 k
Ω
potentiometers) Potentiometer Mode TempCo -10 0 0 32 64 96 128 160 192 224 256 -40 -25 -10 5 20 35 50 65 80 95 110 125 Code (Decimal) Temperature (°C) FIGURE 2-3:
Potentiometer Mode
FIGURE 2-6:
Nominal Resistance 100 kΩ Tempco vs. Code. vs. Temperature. 2003 Microchip Technology Inc. DS11195C-page 7 Document Outline 1.0 Electrical Characteristics Figure 1-1: Detailed Serial interface Timing. Figure 1-2: Reset Timing. Figure 1-3: Software Shutdown Exit Timing. 2.0 Typical Performance Curves Figure 2-1: Normalized Wiper to End Terminal Resistance vs. Code. Figure 2-2: Potentiometer INL Error vs. Code. Figure 2-3: Potentiometer Mode Tempco vs. Code. Figure 2-4: Nominal Resistance 10kW vs. Temperature. Figure 2-5: Nominal Resistance 50kW vs. Temperature. Figure 2-6: Nominal Resistance 100kW vs. Temperature. Figure 2-7: Rheostat INL Error vs. Code. Figure 2-8: Rheostat Mode Tempco vs. Code. Figure 2-9: Static Current vs. Temperature. Figure 2-10: Active Supply Current vs. Temperature. Figure 2-11: Active Supply Current vs. Clock Frequency. Figure 2-12: Reset & Shutdown Pins Current vs. Voltage. Figure 2-13: 10kW Device Wiper Resistance Histogram. Figure 2-14: 50kW, 100kW Device Wiper Resistance Histogram. Figure 2-15: One Position Settling Time. Figure 2-16: Full-Scale Settling Time. Figure 2-17: Digital Feed through vs. Time. Figure 2-18: Gain vs. Frequency for 10kW Potentiometer. Figure 2-19: Gain vs. Frequency for 50kW Potentiometer. Figure 2-20: Gain vs. Frequency for 100kW Potentiometer. Figure 2-21: -3 dB Bandwidths. Figure 2-22: Power Supply Rejection Ratio vs. Frequency. Figure 2-23: 10kW Wiper Resistance vs. Voltage. Figure 2-24: 50kW & 100kW Wiper Resistance vs. Voltage. 2.1 Parametric Test Circuits Figure 2-25: Potentiometer Divider Non- Linearity Error Test Circuit (DNL, INL). Figure 2-26: Resistor Position Non- Linearity Error Test Circuit (Rheostat operation DNL, INL). Figure 2-27: Wiper Resistance Test Circuit. Figure 2-28: Power Supply Sensitivity Test Circuit (PSS, PSRR). Figure 2-29: Gain vs. Frequency Test Circuit. Figure 2-30: Capacitance Test Circuit. 3.0 Pin Descriptions 3.1 PA0, PA1 3.2 PB0, PB1 3.3 PW0, PW1 3.4 Chip Select (CS) 3.5 Serial Clock (SCK) 3.6 Serial Data Input (SI) 3.7 Serial Data Output (SO) (MCP42XXX devices only) 3.8 Reset (RS) (MCP42XXX devices only) 3.9 Shutdown (SHDN) (MCP42XXX devices only) Table 3-1: MCP41XXX Pins Table 3-2: MCP42XXX Pins 4.0 Applications Information Figure 4-1: Block diagram showing the MCP42XXX dual digital potentiometer. Data register 0 and da... 4.1 Modes of Operation Figure 4-2: Two-terminal or rheostat configuration for the digital potentiometer. Acting as a res... Figure 4-3: Three terminal or voltage divider mode. 4.2 Typical Applications Figure 4-4: Single-supply, programmable, inverting gain amplifier using a digital potentiometer. Figure 4-5: Single-supply, programmable, non-inverting gain amplifier. Figure 4-6: Gain vs. Code for inverting and differential amplifier circuits. Figure 4-7: Single Supply programmable differential amplifier using digital potentiometers. Figure 4-8: By changing the values of R1 and R2, the voltage output resolution of this programmab... 4.3 Calculating Resistances Figure 4-9: Potentiometer resistances are a function of code. It should be noted that, when using... Figure 4-10: Example Resistance calculations. 5.0 Serial Interface 5.1 Command Byte 5.2 Writing Data Into Data Registers 5.3 Using The Shutdown Command Figure 5-1: Timing Diagram for Writing Instructions or Data to a Digital Potentiometer. Figure 5-2: Command Byte Format. 5.4 Daisy-Chain Configuration Figure 5-3: Timing Diagram for Daisy-Chain Configuration. Figure 5-4: Daisy-Chain Configuration. 5.5 Reset (RS) Pin Operation 5.6 Shutdown (SHDN) Pin Operation 5.7 Power-up Considerations Table 5-1: Truth Table for Logic Inputs 5.8 Using the MCP41XXX/42XXX in SPI Mode 1,1 Figure 5-5: Timing Diagram for SPI Mode 1,1 Operation. 6.0 Packaging Information 6.1 Package Marking Information