参数资料
| 型号： | ISL54406EVAL1Z |
| 厂商： | Intersil |
| 文件页数： | 2/5页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD FOR ISL54406 |
| 标准包装： | 1 |
| 主要目的： | 音频，音频处理 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ISL54406 |
| 主要属性： | 点弹消除器 |
| 次要属性： | 双路单刀单掷模拟开关 |
| 已供物品： | 板 |
Application Note 1368
Power Supply
The DC power supply connected at banana jacks J1 (V+) and
J2 (GND) provides power to the evaluation board. The IC
requires a +2.7V to +5.0V DC power supply for proper
operation, although the recommended range is +2.7V to
+3.6V. The power supply should be capable of delivering
100μA of current.
Logic Control
The state of the ISL54406 device is determined by the
voltage at the SEL1 (J9/J10) and the SEL2 (J3/J4) inputs.
Normally, jumpers JP1 and JP5 should be in the 1-2 pin
position. If the user desires to control the logic state of SEL1
and SEL2 via switches S1 and S2 on the board, place
jumpers JP1 and JP5 in the 2-3 pin position. In the switch-up
position, SEL1 and SEL2 will be tied to V+ (Logic “1”). In the
down position, a 4M Ω resistor internal to the IC will pull
SEL1 and SEL2 to GND (Logic “0”)
These control pins are 1.8V logic compatible which allows
for control via a standard μcontroller.
Logic “0” (LOW) when ≤ 0.5V (or floating)
Logic “1” (HIGH) when ≥ 1.4V
Logic States
The ISL54406 has four modes of operation that are
determined by the SEL1 and SEL2 logic states: Audio
Playback Mode, Click and Pop Mode, Audio Mute Mode,
and Shutdown (SHDN) Mode.
AUDIO PLAYBACK MODE (SEL1 = SEL2 = 1)
If the SEL1 and SEL2 pins are Logic “1”, the part will be in
the Audio Playback mode. In Audio Playback mode the LIN
and RIN pins are connected to the LOUT and ROUT pins,
respectively, through a 2.5 Ω switch path. The Audio Inputs
have a selectable 100μF or 200μF series DC blocking
capacitor or can be bypassed altogether. The Audio Outputs
can be loaded on the evaluation board with a 32 Ω or a 20k Ω
resistor or can be bypassed altogether.
CLICK AND POP MODE (SEL1 = 1; SEL2 = 0)
If SEL1 is Logic “1” and SEL2 is Logic “0”, the part will go
into Click and Pop Mode. This mode is optimal when
powering up or down the DC biased source inputs or muting
the signal to the load. In Click and Pop Mode, the 2.5 Ω audio
switches are OFF (high impedance). The Audio Output
connections are shunted to ground through 6 Ω resistors that
are internal to the IC and the Audio Input connections are
shunted to ground through 40 Ω resistors that are internal to
the IC (Click and Pop circuitry is active).
Before powering down or powering up of a DC biased
source input, the ISL54406 should be put in the Click and
Pop Mode. In Click and Pop Mode, transients generated at
the Audio Input connections due to a DC step voltage at the
audio source drivers will not pass to the load, thus
eliminating Click and Pop noise.
2
AUDIO MUTE MODE (SEL1 = 0; SEL2 = 1)
If SEL1 is Logic “0” and SEL2 is Logic “1”, the part will be in
the Audio Mute Mode. In the Audio Mute Mode, the audio
switches are OFF (high impedance), the Audio Input Click
and Pop shunt circuitry is inactive (high impedance), and the
Audio Output connections are shorted through 6 Ω resistors
to ground internal to the IC.
In Audio Mute Mode the ISL54406 IC has excellent Off
Isolation for high performance muting of audio signals.
SHUTDOWN MODE (SEL1 = SEL = 0)
If SEL1 and SEL2 pins are Logic “0”, the device will enter a
low powered Shutdown Mode. In SHDN, the audio switches
are OFF, the 6 Ω path is high impedance, the Click and Pop
circuitry is inactive, and the device will draw a minimal
amount of current.
Note: When the logic inputs are floated, the ISL54406 will
automatically be placed in SHDN mode due to the internal
4M Ω pull-down resistors on the logic pins.
Note: Off-Isolation performance is degraded when the
device is placed into SHDN. The design of the ISL54406
optimizes low current consumption in SHDN Mode,
compromising Off-Isolation performance. Thus, SHDN Mode
should not be used for muting audio if Off-Isolation is a
concern.
Note: The ISL54406 should not be brought into Audio
Playback mode directly from Shutdown mode. A DC
transient may occur at the LOUT/ROUT pins when brought
from Shutdown directly to Audio Playback mode. The
recommended procedure is to place the ISL54406 into Mute
mode for at least 100ms when entering or leaving Audio
Playback mode.
CLICK AND POP OPERATION
Single supply audio sources are biased at a DC offset that
generates transients during power on/off of the audio
source. This DC offset is coupled through a blocking
capacitor, causing a transient voltage at the load. When the
source is off and suddenly turned on with a DC offset, the
capacitor will develop a voltage equal to the DC offset. If the
ISL54406 is in Audio mode, a transient discharge will occur
in the speaker, generating a Click and Pop noise.
For proper operation of Click and Pop elimination, the
ISL54406 should be placed in Click and Pop mode before
the audio source is turned on or off. This allows any
transients generated by the source to be discharged through
the Click and Pop circuitry first. With a typical DC blocking
capacitor of 200μF and the Click and Pop circuitry designed
to have a impedance of 40 Ω, allowing a 100ms dead time in
Click and Pop mode for discharging a transient when
entering or leaving Audio Playback mode will eliminate the
DC transient generated by the blocking capacitor.
AN1368.0
August 18, 2008
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