ISSI

IS31AP2121

2×20W STEREO / 1× 40W MONO DIGITAL AUDIO AMPLIFIER WITH 20 BANDS EQ FUNCTIONS, DRC AND 2.1CH MODE

Topology: Buck
Input Voltage (min.): 10.00 V
Input Voltage (max.): 26.00 V

Original publication on 2015-07-07, revision C on

Description

The IS31AP2121 is a digital audio amplifier capable of driving 20W (BTL) each to a pair of 8Ω speakers and 40W (PBTL) to a 4Ω speaker operating at 24V supply without external heat-sink or fan. The IS31AP2121 is also capable of driving 4Ω, 10W (SE)×2 + 8Ω, 20W (BTL)×1 at 24V supply for 2.1CH application.The IS31AP2121 can provide advanced audio processing functions, such as volume control, 20 EQ bands, audio mixing, 3D surround sound and Dynamic Range Control (DRC). These are fully programmable via a simple I2C control interface. Robust protection circuits are provided to protect the IS31AP2121 from damage due to accidental erroneous operating condition. The full digital circuit design of IS31AP2121 is more tolerant to noise and PVT (Process, Voltage, and Temperature) variation than the analog Class-ABor Class-D audio amplifier counterpart implemented by analog circuit design. IS31AP2121 is pop free during instantaneous power on/off or mute/shut down switching because of its robust built-in anti-pop circuit.

Characteristics

  • 16/18/20/24-bits input with I2S, Left-alignment and Right-alignment data format
  • PSNR & DR (A-weighting) Loudspeaker: 104dB (PSNR), 110dB (DR) @24V
  • Multiple sampling frequencies (FS)
  • 32kHz / 44.1kHz / 48kHz and
  • 64kHz / 88.2kHz / 96kHz and
  • 128kHz / 176.4kHz / 192kHz
  • System clock = 64x, 128x, 192x, 256x, 384x, 512x, 576x, 768x, 1024x Fs
  • 64x~1024x FS for 32kHz / 44.1kHz / 48kHz
  • 64x~512x FS for 64kHz / 88.2kHz / 96kHz
  • 64x~256x FS for 128kHz / 176.4kHz / 192kHz
  • Supply voltage 3.3V for digital circuit 10V~26V for speaker driver
  • Supports 2.0CH/2.1CH/Mono configuration
  • Loudspeaker output power for at 24V
  • 10W × 2CH into 8Ω @0.16% THD+N for stereo
  • 15W × 2CH into 8Ω @0.19% THD+N for stereo
  • 20W × 2CH into 8Ω @0.25% THD+N for stereo
  • Sound processing including:
  • 20 bands parametric speaker EQ
  • Volume control (+24dB ~
  • 103dB, 0.125dB/step),
  • Dynamic range control (DRC)
  • Dual band dynamic range control
  • Power clipping
  • 3D surround sound
  • Channel mixing
  • Noise gate with hysteresis window
  • Bass/Treble tone control
  • Bass management crossover filter
  • DC-blocking high-pass filter
  • Anti-pop design
  • Short circuit and over-temperature protection
  • Supports I2C control without MCLK
  • I2C control interface with selectable device address
  • Support BCLK system
  • Support hardware and software reset
  • Internal PLL
  • LV Under-voltage shutdown and HV Under-voltage detection
  • Power saving mode

Products

  Order Code SPEC Product series L
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
Version Verpackung VPE Samples
7447709150 PDF WE-PD SMT Power Inductor 15 6.5 8 21 26 17 Standard
74477420 PDF WE-PD2 SMT Power Inductor 100 0.57 0.68 0.51 0.65 7.5
450301014042 PDF WS-SLTV THT Mini Slide Switch, Opposite Side Connection 10x2.5 mm Bulk 200