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MAS6116 Schematic ( PDF Datasheet ) - Micro Analog Systems

Teilenummer MAS6116
Beschreibung Stereo Digital Volume Control
Hersteller Micro Analog Systems
Logo Micro Analog Systems Logo 




Gesamt 20 Seiten
MAS6116 Datasheet, Funktion
DA6116.009
13 January, 2014
MAS6116
Stereo Digital Volume Control
Signal Voltage up to ± 18V
Gain range from -111.5dB to +15.5dB
Small step sizes 0.5dB
THD 0.0002% in balanced mode
SNR 124dB in balanced mode
DESCRIPTION
MAS6116 is an ultra low noise stereo volume
control IC for high end audio systems. It can work
with input signals as high as ± 18 V but operates
from a single +5V supply with minimal power.
It has a serial interface that controls two audio
channels independently. The gain of each channel
can be programmed from -111.5dB to +15.5dB in
small 0.5dB steps. It is highly linear, especially in
single channel balanced configuration with just
0.0002% THD.
Audible “Clicks” on gain changes are eliminated by
changing gains only during a zero crossing in the
input signal.
A peak detection circuit allows easy monitoring of
the output signal.
The MAS6116 is available in a 16 pin SOIC
package. Its performance is guaranteed over a
temperature range of -30°C to +85°C.
FEATURES
Input signal voltage up to ± 18V
Gain range from -111.5dB to +15.5dB
Small and equal gain step size 0.5dB
0.0002% THD in balanced mono configuration
Dynamic range 121 dB stereo configuration
Two independent channels
Zero cross detection for gain changes
Power on/off transient suppression
Signal peak level detection with adjustable
reference
Instant gain change option
Hardware and software mute function
Single +5V operation
Low power consumption 12mW
APPLICATION
High End Audio Systems
Consumer Audio /Entertainment Systems
Mixing Desks
Audio Recording Equipment
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MAS6116 Datasheet, Funktion
DA6116.009
13 January, 2014
GENERAL DESCRIPTION
Operating modes
When power is first applied, the Power-On Reset circuit (POR) initializes the control registers and sets MAS6116
into mute state, ignoring the state of the XMUTE pin. The activation of the device requires that XMUTE pin is high
and a control byte with a greater than the default value (00HEX) is written in the gain register. It is possible to return
to the mute state either by setting XMUTE pin low or writing zero (00HEX) to the gain register. Setting the XMUTE
pin low will mute both channels. Setting the XMUTE pin back high will return the channels to previously written
gain values. The zero cross detector function is used when entering and returning from the mute state to prevent
large transients in the output signal (see chapter Changing the gain of the channels).
The device has a special test mode register, which is used only for internal testing of the device. It is strongly
recommended not to change the default value (00HEX) of the test register during normal operation. For device
testing the XMUTE pin is bi-directional. When the test register bit 1 is set to high, XMUTE pin is in output mode.
In the test mode internal signals can be directed to the XMUTE pin. Note: In the test mode both analog outputs
are in mute state and the device will not allow new gain values to be written in the gain registers. An exception to
this is the force latch command specified in table Test Register CR5 Description, which can be used to instantly
change the gain of both channels. This function is intended to be used in the test mode only, and it is
recommended to use the commands specified in Register Description to instantly change the channel gains.
Changing the gain of the channels
When a new gain value is written to the gain register the device will activate the zero crossing detection and delay
generator for the selected channel. MAS6116 will wait until a rising edge of the input signal is detected to change
the gain value. This is done to ensure that no audible clicks are produced to the output signal during the gain
change operation. The zero cross detection circuit has also a timeout delay generator that will force the gain
change. The delay generator generates a typical delay of 22 ms.
If a new gain value is written before the previous write operation has finished, the previously written value will be
overwritten and will not be set to the output. If it is desired that each gain value is set to the output, it is
recommended to read the status bit from the write operation status register (CR6) or wait for at least 30 ms
before the next gain change instruction.
Both channels can be programmed independently with separate commands. In this case the gain values will be
set to the output in the order of writing. Both channels can also be programmed to the same value by writing only
one instruction (see the Register Description on page 8).
Note: Due to the input signal dependency of the zero cross detection circuits the order of the gain changes may
differ from the order of writing to the registers if the input signals to the channels are different. This applies to all
instructions that use the zero cross detection and timeout functions, i.e. instructions that are not labeled as
“instant” in the register description.
The new gain value can be set instantly to the output by using the instant gain change function. By using this
command function the gain is set to the output instantly after the write operation has finished, without waiting for a
zero cross to occur in the input signal or a delay to pass. The gains can be set independently to both channels
using different commands, or both channels can be set to the same gain value by using a single command. Using
the instant gain change function to change the gain value in larger than 0.5 dB steps may produce audible clicks
to the output signal.
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MAS6116 pdf, datenblatt
DA6116.009
13 January, 2014
ANALOG CHARACTERISTICS
N Peak Level Detection
(AVCC=+5.0 V, AGND=0 V, TA=+25oC unless otherwise noted)
Parameter
Peak detector
minimum level
Peak detector
maximum level
Peak detector step
size
Symbol
VMIN
VMAX
VSTEP
Conditions
PD reference = 0
PD reference = 255
Min Typ Max Unit
0 18 500 mV
18 18.5 20
V
60 72.5 90
mV
N Zero Cross Detection Timeout
(AVCC=+5.0 V, AGND=0 V, TA=+25oC unless otherwise noted)
Parameter
Symbol
Zero cross
detection timeout
TDEL
Noise [dBV] in Balanced Configuration
0
-30
Conditions
0
-30
Min Typ Max
15 22 30
Noise [dBV] in Unbalanced Configuration
Unit
ms
-60 -60
-90 -90
-120
-120
-100
-80
-60 -40
Gain [dB]
-20
0
20
Figure 1. A-Weighted Noise in Balanced Configuration (gain=0dB)
THD [%] in Balanced Configuration
1.0000
0.1000
0.0100
-120
-120
-100
-80
-60 -40
Gain [dB]
-20
0
20
Figure 2. A-Weighted Noise in Unbalanced Configuration (gain=0dB)
THD [%] in Unbalanced Configuration
1.0000
0.1000
0.0100
0.0010
0.0010
0.0001
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
Vin [Vrms]
Figure 3. THD in Balanced Configuration (fin=1kHz, gain=0dB)
Crosstalk [dB]
0
5.0
0.0001
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Vin [Vrms]
Figure 4. THD in Unbalanced Configuration (fin=1kHz, gain=0dB)
-30
-60
-90
-120
10
100
1000
10000
Frequency [Hz]
Figure 5. Crosstalk Measurement (Vin=5Vrms, gain=0dB)
100000
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