ISSI IS31AP2121, Manual

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IS31AP2121
Integrated Silicon Solution, Inc. – www.issi.com 1
Rev. C, 10/20/2015
2
×
25W STEREO / 1
×
50W MONO DIGITAL AUDIO AMPLIFIER
WITH 20 BANDS EQ FUNCTIONS, DRC AND 2.1CH MODE
October 2015
GENERAL DESCRIPTION
The IS31AP2121 is a digital audio amplifier capable of
driving 25W (BTL) each to a pair of 8
Ω speakers and
50W (PBTL) to a 4 Ω speaker operating at 24V supply
without external heat-sink or fan. The IS31AP2121 is
also capable of driving 4
Ω , 12W (SE)×2 + 8 Ω , 25W
(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-AB
or 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.
APPLICATIONS

TV audio

Boom-box, CD and DVD receiver, docking system

Powered speaker

Wireless audio
FEATURES

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 (F
S
)
- 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 F
S
for 32kHz / 44.1kHz / 48kHz
- 64x~512x F
S
for 64kHz / 88.2kHz / 96kHz
- 64x~256x F
S
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 8 Ω @0.16% THD+N for stereo
- 15W × 2CH into 8 Ω @0.19% THD+N for stereo
- 25W × 2CH into 8 Ω @0.3% 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