SSM3515 Datasheet, PDF (1/41 Pages) Analog Devices – 31 W, Filterless, Class-D Digital Input Audio Amplifier

Data Sheet
31 W, Filterless, Class-D Digital Input
Audio Amplifier
SSM3515
FEATURES
Filterless digital input, mono Class-D amplifier
Operates from a single 4.5 V to 17 V supply
31.3 W output power, 17 V supply, and 4 Ω load at 1% THD + N
107 dB A-weighted signal-to-noise ratio
93.3% efficiency into 8 Ω load at 12 V
I²C control with up to 4 pin selectable slots/addresses
Supports multiple serial data formats up to TDM16
Digital interface supports sample rates from 8 kHz to 192 kHz
Flexible digital and analog gain adjustment
Flexible supply monitoring AGC function
6.55 mA quiescent current with single 17 V PVDD supply
Short-circuit and thermal protection, thermal warning
20-ball, 1.8 mm × 2.2 mm, 0.4 mm pitch WLCSP
Pop and click suppression
User selectable ultralow EMI emissions mode
Power-on reset
APPLICATIONS
Notebooks
Portable electronics
Home audio
GENERAL DESCRIPTION
The SSM3515 is a fully integrated, high efficiency, mono Class-D
audio amplifier with digital inputs. The application circuit
requires a minimum of external components and can operate
from a single 4.5 V to 17 V supply. It can deliver 8.4 W of output
power into an 8 Ω load or 15.8 W into an 4 Ω load from a 12 V
power supply, or 31.3 W into an 4 Ω load from a 17 V power
supply, all with 1% THD + N.
The SSM3515 features a high efficiency, low noise modulation
scheme that requires no external LC output filters. This scheme
provides high efficiency even at low output power. It operates
with 92% efficiency at 7 W into an 8 Ω load or 88% efficiency at
15 W into 4 Ω from a 12 V supply.
Spread spectrum pulse density modulation provides lower EMI
radiated emissions compared with other Class-D architectures,
particularly above 100 MHz.
The digital input eliminates the need for an external digital-to-
analog converter (DAC). The SSM3515 has a micropower
shutdown mode with a typical shutdown current of 39 nA at
the 12 V PVDD supply. The device also includes pop and click
suppression circuitry that minimizes voltage glitches at the
output during turn on and turn off.
The SSM3515 operates with or without an I²C control interface.
The SSM3515 is specified over the commercial temperature range
(−40°C to +85°C). It has built in thermal shutdown and output
short-circuit protection. It is available in a halide-free, 20-ball,
1.8 mm × 2.2 mm wafer-level chip scale package (WLCSP).
FUNCTIONAL BLOCK DIAGRAM
5V
1.8V
SCL
SDA
BCLK
FSYNC
SDATA
VREG50/AVDD VREG18/DVDD
I²C
AGND
REG_EN
ADDR
BST+
TDM
I²S
INPUT
VOLUME
DAC
Σ-Δ
CLASS-D
MODULATOR
FULL
BRIDGE
POWER
STAGE
OUT+
OUT–
SSM3515
BST–
PVDD PGND
Figure 1.
Rev. 0
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