Datasheet MCP41XXX/42XXX (Microchip) - 10

MCP41XXX/42XXX 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
6 40
Code = FFh
VDD = 4.5V to 5.5V, 0 Code = 80h,
Code = 80h
35 10 k
Ω
Potentiometer -6 CL = 27 pF,
Code = 40h
V -12 30 A = 4V Refer to Figure 2-28
Code = 20h
-18 25
Code = 10h
-24
Code = 08h
20 50 k
Ω
Potentiometer -30 Gain (dB)
Code = 04h
-36 15 PSRR (dB)
Code = 02h
-42 10 100 k
Ω
Potentiometer -48
Code = 01h
5 -54
CL = 30pF, Refer to Figure 2-29 MCP41050, MCP42050 (50kΩ potentiometers)
-60 0 100 1k 10k 100k 1M 10M 1k 10k 100k 1M 10M Frequency (Hz) Frequency (Hz) FIGURE 2-19:
Gain vs. Frequency for
FIGURE 2-22:
Power Supply Rejection 50kΩ Potentiometer. Ratio vs. Frequency.
6 700
Code = FFh
MCP41010, MCP42010 0 Iw = 1 mA, Code = 00h,
Code = 80h
) 600 -6
Ω
Refer to Figure 2-27
Code = 40h
VDD = 2.7V -12 500
Code = 20h
-18 400
Code = 10h
-24
Code = 08h
-30 300 Gain (dB)
Code = 04h
-36 200
Code = 02h
-42 VDD = 5V
Code = 01h
Wiper Resistance ( 100 -48 -54
CL = 30pF, Refer to Figure 2-29
0
MCP41100, MCP42100 (100kΩ potentiometers)
-60 0 1 2 3 4 5 100 1k 10k 100k 1M Frequency (Hz) Terminal B Voltage (V) FIGURE 2-20:
Gain vs. Frequency for
FIGURE 2-23:
10 kΩ Wiper Resistance vs. 100kΩ Potentiometer. Voltage.
0 450 Code = 00h 400 Refer to Figure 2-27 -6 )
Ω
350 1.06 MHz 145 kHz -12 300 VDD = 2.7V 279 kHz 250 -18 10 k
Ω
200 Gain (dB) 150 -24 100 VDD = 5V 50 k
Ω
Wiper Resistance ( -30 50 CL = 30 pF, Code = 80h 100 k
Ω
0 Refer to Figure 2-29 -36 0 1 2 3 4 5 1k 10k 100k 1M 10M Frequency (Hz) Terminal B Voltage (V) FIGURE 2-21:
-3 dB Bandwidths.
FIGURE 2-24:
50 kΩ & 100 kΩ Wiper Resistance vs. Voltage. DS11195C-page 10 2003 Microchip Technology Inc. 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