The SSM2804 is an audio subsystem designed specifically for mobile phones. It features 3 single-ended stereo audio inputs with optional differential mode, stereo, 1.4 W, filterless Class-D amplifiers with Σ-Δ modulation, integrated receiver path bypass switch, configurable, high performance capless headphone output with true ground Class-G technology, optional hardware-based headphone level limiter, I2C control interface, volume control, flexible input/output mixing, output mode control, EMI emissions control, automatic level control (ALC), adjustable headphone level limiter, low shutdown current, short-circuit and thermal protection, pop-and-click suppression, and is available in a 30-ball, 2.5 mm × 3.0 mm WLCSP.
The SSM2804 is an audio subsystem designed for mobile phones and portable multimedia devices. It offers three configurable input channels, Class‑D speaker amplification, a capless Class‑G headphone driver, and an integrated receiver‑path bypass switch, all controlled via a 2‑wire I²C interface.
The document includes detailed specifications such as supply voltage ranges, quiescent currents, output power levels, THD+N, and signal‑to‑noise ratios, as well as functional block diagrams, pin‑out tables, I²C timing characteristics, absolute maximum ratings, and typical performance curves to aid designers in integrating the chip into their products.
| Analog Voltage Supply (AVDD) | 2.5 V min / 3.3 V typ / 3.6 V max |
|---|---|
| Speaker Voltage Supply (PVDD) | 2.7 V min / 3.6 V typ / 5.5 V max |
| Total Quiescent Current (IDD) | 3.5 mA (HP mode) – 9.8 mA (HP & Class‑D) |
| Power‑Down Current (ISD) | 1 µA |
| Operating Temperature Range | ‑40 °C to +85 °C |
| THD+N (Class‑D) | 0.01 % at 8 Ω |
| Signal‑to‑Noise Ratio (SNR) | 94 dB |
The analog supply (AVDD) ranges from 2.5 V minimum to 3.6 V maximum, with a typical value of 3.3 V.
It is specified for operation from –40 °C to +85 °C.
The device provides three single‑ended stereo audio inputs that can be configured as differential channels.