CAT5120, CAT5121, CAT5122 16‐tap Digital Potentiometers (POTs) with 2‐wire Interface http://onsemi.com Description CAT5120/5121/5122 linear-taper digital POTs perform the same function as a mechanical potentiometer or a variable resistor. These devices consist of a fixed resistor and a wiper contact with 16-tap points that are digitally controlled through a 2-wire up/down serial interface. The CAT5120 is configured as a potentiometer. The CAT5121 and CAT5122 are configured as variable resistors. See Pin Configurations for part functionality. Two resistance values are available: 10 kW and 50 kW. These are available in space-saving 5-pin and 6-pin SC−70 and SOT−23 packages. Features 0.3 mA Ultra-low Standby Current Single-supply Operation: 2.7 V to 5.5 V Glitchless Switching between Resistor Taps Power-on Reset to Midscale 2-wire Up/Down Serial Interface Resistance Values: 10 kW, 50 kW Available in SC−70 and SOT−23 Packages These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS Compliant SC−70 SD SUFFIX CASE 419AD SOT−23 TB SUFFIX CASE 527AJ SC−70 SD SUFFIX CASE 419AC SOT−23 TB SUFFIX CASE 527AH PIN CONFIGURATIONS SC−70 SOT−23 VDD 1 6 H GND 2 5 W U/D 3 4 CS SC−70 SOT−23 Applications CAT5120 LCD Screen Adjustment Volume Control Mechanical Potentiometer Replacement Gain Adjustment Line Impedance Matching VDD 6 H 1 GND 2 5 L CAT5121 4 CS U/D 3 SC−70 SOT−23 5 H VDD 1 GND 2 CAT5122 U/D 3 4 CS ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 7 of this data sheet. Semiconductor Components Industries, LLC, 2013 July, 2013 − Rev. 8 1 Publication Order Number: CAT5120/D CAT5120, CAT5121, CAT5122 H VDD UP−DOWN COUNTER CS U/D 16−POSITION DECODER GND W L Figure 1. Functional Diagram Table 1. PIN DESCRIPTIONS Name Description VDD Power Supply GND Ground U/D Up/Down Control Input. With CS low, a low-to-high transition increments or decrements the wiper position. CS Chip Select Input. A high-to-low CS transition determines the mode: increment if U/D is high, or decrement if U/D is low. L Low Terminal of Resistor W Wiper Terminal of Resistor H High Terminal of Resistor Table 2. ABSOLUTE MAXIMUM RATINGS Parameters Ratings Units −0.3 to +6 V −0.3 to (VDD + 0.3) V Input and Output Latch-up Immunity 200 mA Maximum Continuous Current into H, L and W 50 kW ą10 kW 1.3 1.3 Continuous Power Dissipation (TA = +70C) 5-pin SC−70 (Note 1) 6-pin SC−70 (Note 1) 247 245 VDD to GND All Other Pins to GND mA Operating Temperature Range Junction Temperature Storage Temperature Range Soldering Temperature (soldering, 10 s) mW −40 to +85 C +150 C −65 to +150 C +300 C Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. Derate 3.1 mW/C above TA = +70C http://onsemi.com 2 CAT5120, CAT5121, CAT5122 Table 3. ELECTRICAL CHARACTERISTICS (VDD = 2.7 V to 5.5 V, VH = VDD, VL = 0, TA = −40C to +85C. Typical values are at VDD = 2.7 V, TA = 25C, unless otherwise noted.) Parameter Symbol Conditions Min Typ Max Units DC PERFORMANCE 16 Resolution Taps End-to-End Resistance (−50) 37.5 50 62.5 End-to-End Resistance (−10) 7.5 10 12.5 End-to-End Resistance Tempco TCR 200 Ratiometric Resistance Tempco kW ppm/C 5 ppm/C Integral Non-linearity INL 0.5 LSB Differential Non-linearity DNL 0.5 LSB 0.1 0.5 LSB 200 600 W Zero/Full-Scale Error Wiper Resistance RW DIGITAL INPUTS Input High Voltage VIH Input Low Voltage VIL 0.7 x VDD V 0.3 x VDD V TIMING CHARACTERISTICS (Figures 7, 8) U/D Mode to CS Setup tCU 25 ns CS to U/D Step Setup tCI 50 ns CS to U/D Step Hold tIC 25 ns U/D Step Low Period tIL 25 ns tIH 25 U/D Step High Period Up/Down Toggle Rate (Note 2) fTOGGLE Output Settling Time (Note 3) tSETTLE ns 1 MHz 50 kW variable resistor configuration, CL = 10 pF 1 ms 50 kW potentiometer configuration, CL = 10 pF 0.25 POWER SUPPLY Supply Voltage VDD Active Supply Current (Note 4) IDD Standby Supply Current (Note 5) ISB 2. 3. 4. 5. 2.7 VDD = +5 V Up/Down Toggle Rate: fTOGGLE = 1 / tSETTLE Typical settling times are dependent on end-to-end resistance. Supply current measured while changing wiper tap, fTOGGLE = 1 MHz. Supply current measured while wiper position is fixed. http://onsemi.com 3 0.3 5.5 V 25 mA 1 mA CAT5120, CAT5121, CAT5122 TYPICAL OPERATING CHARACTERISTICS (TA = 25C, unless otherwise noted.) 1.5 200 END−TO−END RESISTANCE CHANGE (%) WIPER RESISTANCE (W) 250 VDD = 2.7 V 150 VDD = 5.5 V 100 50 0 0 4 8 12 16 20 24 28 50 K 0 −0.5 −1.0 −1.5 0 50 100 150 WIPER POSITION TEMPERATURE (C) Figure 2. Wiper Resistance vs. Tap Position Figure 3. Change in End-to-End Resistance vs. Temperature 0.45 0.40 100 80 60 50 k 40 VDD = 5.5 V 0.35 100 k CURRENT (mA) RESISTANCE (kW) 0.5 −2.0 −50 32 120 0.30 VDD = 2.7 V 0.25 0.20 0.15 0.10 20 0 1.0 0.05 10 k 1 3 5 7 0 −50 9 11 13 15 17 19 21 23 25 27 29 31 0 50 100 TAP POSITION TEMPERATURE (C) Figure 4. W-to-L Resistance vs. Tap Position Figure 5. Supply Current vs. Temperature U/D 2 V/div Wiper Output 100 mV/div 200 ns/div Figure 6. Tap-to-Tap Switching Transient http://onsemi.com 4 150 CAT5120, CAT5121, CAT5122 FUNCTIONAL DESCRIPTION The CAT5120/5121/5122 consist of a fixed resistor and a wiper contact with 16-tap points that are digitally controlled through a 2-wire up/down serial interface. Two end-to-end resistance values are available: 10 kW and 50 kW. The CAT5120 is designed to operate as a potentiometer. In this configuration, the low terminal of the resistor array is connected to ground (pin 2). The CAT5122 performs as a variable resistor. In this device, the wiper terminal and high terminal of the resistor array is connected at pin 5. The CAT5121 is a similar variable resistor, except the low terminal is connected to pin 5. low, the part will go into increment mode if U/D input is high, and into decrement mode when U/D input is low. Once the mode is set, the device will remain in that mode until CS goes high again. A low-to-high transition at the U/D pin will increment or decrement the wiper position depending on the current mode (Figures 7 and 8). When the CS input transitions to high (serial interface inactive), the value of the counter is stored and the wiper position is maintained. Note that when the wiper reaches the maximum (or minimum) tap position, the wiper will not wrap around to the minimum (or maximum) position. Digital Interface Operation Power-on Reset The devices have two modes of operation when the serial interface is active: increment and decrement mode. The serial interface is only active when CS is low. The CS and U/D inputs control the position of the wiper along the resistor array. When CS transitions from high to All parts in this family feature power-on reset (POR) circuitry that sets the wiper position to midscale at power-up. By default, the chip is in the increment mode. CS tCU tIC tIL U/D tIH tCI tSETTLE tSETTLE W Note: “W” is not a digital signal. It represents wiper transitions. Figure 7. Serial Interface Timing Diagram, Increment Mode CS tCU tIC tIH U/D tIL W tCI tSETTLE tSETTLE Note: “W” is not a digital signal. It represents wiper transitions. Figure 8. Serial Interface Timing Diagram, Decrement Mode http://onsemi.com 5 CAT5120, CAT5121, CAT5122 APPLICATIONS INFORMATION Adjustable Gain The devices are intended for circuits requiring digitally controlled adjustable resistance, such as LCD contrast control, where voltage biasing adjusts the display contrast. Figures 11 and 12 show how to use the variable resistor to digitally adjust the gain of a noninverting op amp configuration. Connect the CAT5121 in series with a resistor to ground to form the adjustable gain control of a noninverting amplifier. The devices have a low 5 ppm/C ratiometric tempco that allows for a very stable adjustable gain configuration over temperature. Alternative Positive LCD Bias Control Use an op amp to provide buffering and gain on the output of the CAT5120. Connect the mechanical potentiometer to the positive input of a noninverting op amp (Figure 9) to select a portion of the input signal by digitally controlling the wiper terminal. Figure 10 shows a similar circuit for the CAT5121. +5 V +5 V H H W CAT5120 30 V 30 V VOUT VOUT L L CAT5121 Figure 9. Positive LCD Bias Control Figure 10. Positive LCD Bias Control VCC VCC VIN VIN VOUT VOUT H L CAT5121 W H CAT5120 L Figure 11. Adjustable Gain Circuit Figure 12. Adjustable Gain Circuit http://onsemi.com 6 CAT5120, CAT5121, CAT5122 Table 4. ORDERING INFORMATION Resistor [kW] Package Shipping† CAT5120SDI−10GT3 10 SC70−6 (Pb−Free) 3000 / Tape & Reel CAT5120TBI−10GT3 10 SOT23−6 (Pb−Free) 3000 / Tape & Reel CAT5120SDI−50GT3 50 SC70−6 (Pb−Free) 3000 / Tape & Reel CAT5120TBI−50GT3 50 SOT23−6 (Pb−Free) 3000 / Tape & Reel CAT5121SDI−10GT3 10 SC70−6 (Pb−Free) 3000 / Tape & Reel CAT5121TBI−10GT3 10 SOT23−6 (Pb−Free) 3000 / Tape & Reel CAT5121SDI−50GT3 50 SC70−6 (Pb−Free) 3000 / Tape & Reel CAT5121TBI−50GT3 50 SOT23−6 (Pb−Free) 3000 / Tape & Reel CAT5122SDI−10GT3 10 SC70−5 (Pb−Free) 3000 / Tape & Reel CAT5122TBI−10GT3 10 SOT23−5 (Pb−Free) 3000 / Tape & Reel CAT5122SDI−50GT3 50 SC70−5 (Pb−Free) 3000 / Tape & Reel CAT5122TBI−50GT3 50 SOT23−5 (Pb−Free) 3000 / Tape & Reel Orderable Part Number †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. 6. For detailed information and a breakdown of device nomenclature and numbering systems, please see the ON Semiconductor Device Nomenclature document, TND310/D, available at www.onsemi.com. http://onsemi.com 7 CAT5120, CAT5121, CAT5122 PACKAGE DIMENSIONS SC−88 (SC−70 6 Lead), 1.25x2 CASE 419AD ISSUE A SYMBOL D e e E1 E MIN MAX A 0.80 1.10 A1 0.00 0.10 A2 0.80 1.00 b 0.15 0.30 c 0.10 0.18 D 1.80 2.00 2.20 E 1.80 2.10 2.40 E1 1.15 1.25 1.35 0.65 BSC e L TOP VIEW NOM 0.26 0.36 L1 0.42 REF L2 0.15 BSC 0.46 θ 0º 8º θ1 4º 10º q1 A2 A q q1 b L L1 A1 SIDE VIEW c END VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-203. http://onsemi.com 8 L2 CAT5120, CAT5121, CAT5122 PACKAGE DIMENSIONS SOT−23, 6 Lead CASE 527AJ ISSUE B D A NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. CONTROLLING DIMENSION: MILLIMETERS. 3. DATUM C IS THE SEATING PLANE. B 6 5 4 1 2 3 E E1 GAGE PLANE 6X e TOP VIEW L2 b 0.20 SEATING PLANE L M C A S B S DETAIL A A2 c A 6X 0.10 C A1 SIDE VIEW C SEATING PLANE DETAIL A END VIEW RECOMMENDED SOLDERING FOOTPRINT* 3.30 6X 0.85 6X 0.56 0.95 PITCH DIMENSIONS: MILLIMETERS *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. http://onsemi.com 9 DIM A A1 A2 b c D E E1 e L L2 MILLIMETERS MIN MAX --1.45 0.00 0.15 0.90 1.30 0.20 0.50 0.08 0.26 2.70 3.00 2.50 3.10 1.30 1.80 0.95 BSC 0.20 0.60 0.25 BSC CAT5120, CAT5121, CAT5122 PACKAGE DIMENSIONS SC−88A (SC−70 5 Lead), 1.25x2 CASE 419AC ISSUE A SYMBOL MIN A 0.80 1.10 A1 0.00 0.10 A2 0.80 1.00 b 0.15 0.30 c 0.10 0.18 D 1.80 2.00 2.20 E 1.80 2.10 2.40 E1 1.15 1.25 1.35 D e e E1 E e MAX 0.65 BSC L TOP VIEW NOM 0.26 0.36 L1 0.42 REF L2 0.15 BSC 0.46 θ 0º 8º θ1 4º 10º q1 A2 A q q1 b L L1 A1 SIDE VIEW c END VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-203. http://onsemi.com 10 L2 CAT5120, CAT5121, CAT5122 PACKAGE DIMENSIONS SOT−23, 5 Lead CASE 527AH ISSUE O D SYMBOL E1 MIN NOM 0.90 1.45 A1 0.00 0.15 A2 0.90 b 0.30 0.50 c 0.08 0.22 E 1.15 D 2.90 BSC E 2.80 BSC E1 1.60 BSC e e L 1.30 0.95 BSC 0.45 0.30 L1 PIN #1 IDENTIFICATION MAX A 0.60 0.60 REF L2 0.25 REF θ 0° 4° 8° θ1 5° 10° 15° θ2 5° 10° 15° TOP VIEW θ1 A2 A θ b θ2 L1 A1 SIDE VIEW L2 L c END VIEW Notes: (1) All dimensions in millimeters. Angles in degrees. (2) Complies with JEDEC standard MO-178. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. 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