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PDF ( 数据手册 , 数据表 ) ISL22102

零件编号 ISL22102
描述 Dual Audio Logarithmic Potentiometer
制造商 Intersil
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ISL22102 数据手册, 描述, 功能
ISL22102
Dual, Audio, Push-button Controlled Potentiometer (XDCP™)
Data Sheet
September 21, 2015
FN6788.2
32 Tap, Push-button, Dual Audio
Logarithmic Potentiometer with Buffer
Amplifiers and Audio Detection
The ISL22102 integrates two digitally controlled
potentiometers (DCP) with buffered wiper outputs and an
internal bias voltage generator (VB) on a monolithic CMOS
integrated circuit. The wiper position is adjusted by the user
through simple Up and Down push buttons, ideal for stereo
volume control in audio applications.
Each potentiometer is implemented using 31 polysilicon
resistors in a logarithmic array. Between each of the
resistors are tap points connected to the wiper terminal
through switches. When powered up, the wipers are reset to
the -20dB position.
In addition to the ISL22102’s low noise design, the ISL22102
also contains a zero-crossing detection circuitry to further
minimize click and pop noise during volume transition.
The internal VB generator of the ISL22102 provides a
precision middle scale voltage reference that reduces
external circuitry and simplifies application design.
The ISL22102 implements two power saving techniques for
power critical applications. It is a Standby Mode that can be
enabled to reduce the power consumption of the part when
DCP is not in use. The part also has Audio Detection
circuitry that provides an indication FLAG to external devices
and services. The FLAG can be delayed through D0, D1 and
D2 pin configuration. By connecting the FLAG to the standby
pin (SB), it will automatically put the part into Standby Mode.
Pinout
ISL22102
(20 LD QFN)
TOP VIEW
20 19 18 17 16
DN 1
MUTE 2
VCC 3
AVCC 4
LEFT_IN 5
15 D0
14 VTH
13 GND
12 HPB
11 HPA
6 7 8 9 10
Features
• Dual Audio Control – Two 32 Taps Log Pots
• Buffered Wiper Outputs
• Audio Detection with Threshold Input and Controlled
Delay
• Zero Amplitude Wiper Switching (ZAWS)
• Simple Push-button Interface
• Auto Increment/decrement After 1s Button Press
• Standby Mode
• Mute Function
• Total Resistance: 18.5keach DCP (Typical)
• Voltage Operation
- VCC = 2.7V to 5.5V
- AVCC = 2.7V to 5.5V
• Temp Range = -40°C to +85°C
• Package Options
- 20 Ld TSSOP
- 20 Ld QFN
• Pb-Free (RoHS Compliant)
Audio Performance
• 0dB to -72dB Volume Control
• -90dB Mute
• SNR: -90dB
• THD+N: 0.01% @ 1kHz
• Crosstalk Rejection: -100dB @ 1kHz
• Channel-to-Channel Variation: ±0.1dB
• Mid point 3dB-Cutoff: 100kHz
Applications
• Set Top Boxes
• Stereo Amplifiers
• DVD Players
• Portable Audio Products
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas LLC
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas LLC 2008, 2010, 2015. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.







ISL22102 pdf, 数据表
ISL22102
VTH
This terminal allows to set up the threshold level of audio
input to be detected. When audio input to either Left or Right
channel is below this threshold - the FLAG output is Low;
when audio input is above this threshold - the FLAG output
is High. The threshold level is maintained over an external
resistor RTH placed between VTH pin, which is a source of
±10µA current, and VB pin. To calculate the actual threshold
we need to multiply 10µA by a resistor value and divide the
result by 1000. For example, a 100kresistor is a subject of
1mV audio detection threshold, e.g. 10µA*100k/1000 = 1mV.
Note, the VTH threshold multiplied by 1000 should not exceed
1/2 of AVCC. The maximum resistor value for detection
threshold can be found in Table 2.
TABLE 2. RTH vs AVCC
AVCC (V)
5.5
MAX RTH (k)
188
5.25 177
5.0 167
4.75 156
4.5 146
4.25 135
4.0 125
3.75 115
3.5 104
3.25 94
3.0 83
2.75 73
Device Operation
There are four sections in the ISL22102: the input control,
counter and decode section, two resistor arrays with
buffered wiper outputs, reference voltage generator of VB
output, and audio detection block with programmable delay
FLAG output. The input control section operates just like an
up/down counter. The output of this counter is decoded to
turn on a single electronic switch, connecting a point on the
resistor array to the wiper output. Each resistor array is
comprised of 31 individual resistors connected in series and
its wiper output pass an attenuated audio input to the power
amplifier. Both resistor arrays have logarithmic taper with
-72dB dynamic range as shown in Table 2.
The ISL22102 is designed to interface directly to two
push-button switches for effectively moving the wipers up or
down. The UP and DN inputs increment or decrement 5-bit
counters respectively. The output of these counters are
decoded to select one of the thirty-two wiper positions along
the resistive array. The wiper increment input, UP, and the
wiper decrement input, DN, are both connected to an
internal pull-up so that they normally remain High. When
pulled Low by an external push button switch or a logic Low
level input, the wipers will be switched to the next adjacent
tap position.
Internal debounce circuitry prevents inadvertent switching of
the wipers position if UP or DN remain Low for less than
15ms, typical. Each of the buttons can be pushed either
once for a single increment/decrement or continuously for a
multiple increments/decrements. When making a continuous
push, after the first second, the device is going to auto
increment/decrement mode. If the button is held for longer
than 1s, the wiper position will be auto
incremented/decremented with a rate of 4Hz for 4s, and with
a rate of 8Hz after that. As soon as the button is released,
the ISL22102 will return to a low power standby condition.
Each wiper acts like its mechanical equivalent and does not
move beyond the last position. That is, the counter does not
wrap around when clocked to either extreme.
Table 3 contains information about attenuation level for each
tap position.
TABLE 3. WIPER TAP POSITION vs ATTENUATION
TAP POSITION
ATTENUATION
00
1 -2dB
2 -4dB
3 -6dB
4 -8dB
5 -10dB
6 -12dB
7 -14dB
8 -16dB
9 -18dB
10 -20dB
11 -22dB
12 -24dB
13 -26dB
14 -28dB
15 -30dB
16 -32dB
17 -34dB
18 -36dB
19 -38dB
20 -40dB
21 -42dB
22 -44dB
23 -46dB
24 -48dB
8 FN6788.2
September 21, 2015














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