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LM4970 Scheda tecnica(PDF) 5 Page - Texas Instruments |
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LM4970 Scheda tecnica(HTML) 5 Page - Texas Instruments |
5 / 19 page LM4970 www.ti.com SNVS312D – JANUARY 2005 – REVISED MAY 2013 Color LED Driver Electrical Characteristics VDD = 3.0V (1) (2) (3) The following specifications apply for VDD = 3.0V unless otherwise specified. Limits apply for TA = 25°C. LM4970 Units Symbol Parameter Conditions (Limits) Typical(4) Limits(5)(6) IDDRGB Supply Curent 2.2 3 mA (max) ISDRGB Shutdown Current(3) Shutdown Mode 0.5 2 μA (max) .66X current drive setting 12 mA 1X current drive setting 18 mA ILED LED Drive Current 1.33X current drive setting 27 mA 2X current drive setting 35 21 mA (min) fPWM PWM Frequency PWM_F<1:0> = '01' 60 Hz Maximum setting 12 dB Input Signal Level Gain Control Minimum setting –11 dB (1) All voltages are measured with respect to the GND pin unless otherwise specified. (2) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional but do not ensure specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which specify specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not ensured for parameters where no limit is given, however, the typical value is a good indication of device performance. (3) Shutdown current and supply current are measured in a normal room environment. All digital input pins are connected to I2CVDD. (4) Typicals are measured at +25°C and represent the parametric norm. (5) Limits are ensured to AOQL (Average Outgoing Quality Level). (6) Datasheet min/max specification limits are ensured by design, test, or statistical analysis. External Components Description Components Functional Description 1. Ci This is the input coupling capacitor. It blocks the DC voltage and couples the input signal to the amplifier's input terminals. CIN also creates a highpass filter with an internal 20kΩ resistor at fc = 1/(2π.20000.Ci). 2. CS This is the supply bypass capacitor. It filters the supply voltage applied to the VDD pin and helps reduce the noise at the VDD pin. 3. Cfilt This capacitor creates a low pass filter with an internal 4k Ω resistor at fc = 1/(2π*4000*Cfilt). This pole set at fc determines the high cutoff frequency for the low band PWM color LED driver output, LED1. Copyright © 2005–2013, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM4970 |
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