1
FN6788.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas LLC 2008, 2010, 2015. All Rights Reserved
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ISL22102
Dual, Audio, Push-button Controlled Potentiometer (XDCP™)
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
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: 18.5k each 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
ISL22102
(20 LD QFN)
TOP VIEW
UP
FLAG
D2
SB
D1
LEFT_OUT
VB
RIGHT_OUT
CB
RIGHT_IN
DN
VCC
AVCC
MUTE
LEFT_IN
D0
GND
HPB
V
TH
HPA
1
2
3
4
5
678910
15
14
13
12
11
20 19 18 17 16
Data Sheet September 21, 2015
