lm4875mx

@@ -0,0 +1,49 @@+# LM4875MX++**Texas Instruments** · Audio Power OpAmps · SOIC-8++LM4875MX from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | VO1 | output | Amp1 (non-inverting bridge half) audio output. Drives one side of the bridged 8 Ω speaker and, in headphone mode, drives the single-ended headphone load referenced to GND. Biased at VDD/2 in bridge mode. |+| 2 | BYPASS | passive | Half-supply (VDD/2) bias-node bypass pin. A capacitor CB (typically 1.0 µF) from this pin to GND filters the internal bias reference and sets the click/pop turn-on time (~280 ms with 1.0 µF). Larger CB improves PSRR. |+| 3 | HP-Sense | input | Headphone-sense control input. VIL ≤ 0.8 V places the amplifier in bridged speaker mode; VIH ≥ 4 V (up to VCC) mutes Amp2, disconnects the bridge load, and enables single-ended headphone drive from VO1. Typically driven by a headphone-jack switch contact through a resistor divider. |+| 4 | DC Vol/SD | input | DC voltage volume control and shutdown pin. Input range GND to VDD sets gain from about −72 dB (VPIN4 ≤ 0.9 V, 20% VDD) up to +20 dB (VPIN4 ≥ 4.0 V, 80% VDD). Applying <300 mV activates the 0.7 µA micropower shutdown; 500 mV-1 V asserts mute (~75 dB attenuation). |+| 5 | -IN | input | Inverting audio input to Amp1. Drive through an input coupling capacitor Ci (blocks DC and forms a highpass with the internal 10 kΩ-110 kΩ input resistor RIN, which varies with the DC Vol/SD setting). Amp1's closed-loop gain is set by the DC Vol/SD voltage. |+| 6 | GND | power_in | Device ground / analog reference. All voltages in the datasheet are measured with respect to this pin. |+| 7 | VDD | power_in | Positive supply rail. Operating range 2.7 V to 5.5 V (absolute max 6.0 V). Quiescent current 4 mA typ (bridge mode) / 3.5 mA typ (headphone mode). Bypass close to the pin with 10 µF and 0.1 µF capacitors to GND for low noise and high PSRR. |+| 8 | VO2 | output | Amp2 (inverting bridge half) audio output. Drives the second side of the bridge-mode 8 Ω speaker with a signal 180° out of phase with VO1 (fixed −1 gain vs Amp1). Muted (Amp2 off) when HP-Sense is driven high. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-8 |+| Category | Op-amp/Cmp |+| Pins | 8 |++## Ordering variants++- `LM4875MXLM4875M/NOPB`+- `LM4875MX/NOPB`+- `LM4875MXLM4875MM/NOPB`++## CAD (KiCad official)++- Symbol: `LM4875MX`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/lm4875mx.pdf) (None pp, sha256 `25dfcc49bd825558`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/lm4875mx-datasheet.pdf)

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