# LR680K

**蜂鸟无线** · RF Transceiver ICs · SOP-8

LR680K from 蜂鸟无线, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VSSRF | power_in | Ground (RF ground) pin of the receiver. |
| 2 | ANT | input | Antenna input for the RF signal. |
| 3 | VDDRF | power_in | Positive power supply pin (datasheet supply voltage 2 to 5.5 V, typical 5 V). |
| 4 | CTH | passive | Demodulator low-pass filter output with internal 120 kOhm output resistance, connected to ground through an external capacitor (330 uF recommended), providing the average-voltage reference for the comparator. |
| 5 | DOUT | output | Data output pin. |
| 6 | SHUT | input | Enable pin: 0 for normal operation, VDD to shut down; requires external control and is high-impedance internally. |
| 7 | CAGC | passive | AGC module filter capacitor pin, connected to ground through an external capacitor (1 uF recommended). |
| 8 | OSC | passive | Reference oscillator input for a crystal or ceramic resonator (crystal required in narrow-bandwidth mode); a clock signal can also be driven directly into it. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | 蜂鸟无线 |
| Package | SOP-8 |
| Category | RF And Wireless |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage |  | 4 |  | 5.5 | V |  | 1 |
| Operating frequency range |  | 300 |  | 440 | MHz |  | 1 |
| Operating current |  |  | 3.5 |  | mA | 315MHz | 1 |
| Operating current |  |  | 5.5 |  | mA | 433.92MHz | 1 |
| Sensitivity |  |  | -115 |  | dBm | OOK modulation | 1 |

## CAD (KiCad official)

- Symbol: `LR680K`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `lr680k-etched.step` / `lr680k-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lr680k.step` / `lr680k.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [蜂鸟无线 datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590921210899345408) (10 pp, sha256 `b7558906f06fa359`, retrieved 2026-10-17, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/lr680k-datasheet.pdf)