SSM2163 データシートの表示（PDF） - Analog Devices
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SSM2163 Datasheet PDF : 16 Pages
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VDD
4
VCC 10
10µF +
AGND 17
ACOM (NC)
VSS 2
VEE
12
10µF
+
1
DGND
V+
0.1µF
V–
0.1µF
SSM2163 power supply connections
4
VDD
10
VCC
+
10µF
17
AGND
V+
0.1µF
13
ACOM
VSS 2
12
VEE
1
DGND
+
10µF
VREF
OUT
0.1µF
SSM2163
VDD 4
VCC 10
+
10µF
17
AGND
ACOM (NC)
VSS 2
12
VEE
1
DGND
V+
0.1µF
EXTERNAL
REFERENCE
Figure 22a. Dual Supply
Figure 22b. Single Supply
Figure 22c. Single Supply Using External
Reference
stored in the attenuator control registers. To re-enable the
system after a mute, use the address byte to turn on the desired
mixer channel. The selected channel will then operate with the
previously set attenuator value.
Serial Data Input Format
As previously mentioned, data is written to the SSM2163 in two
8-bit bytes. The serial data format is shown in the Address and
Data Decoding Truth Table, Figure 3. The first byte sent contains
the channel address and the Left/Right output mixer control bits.
The address byte is identified by the MSB being high.
The second byte contains the data (i.e., the attenuator value).
The six LSBs of this byte set the attenuation level, from 0 dB to
–63 dB. The MSB of the data byte must be a logic zero.
The standard format for data sent to the SSM2163 is an address
byte followed by a data (attenuator level) byte. In some cases,
however, only one byte needs to be sent. For example,
attenuation levels are not affected by the MUTE input. To turn
a muted channel on, simply send an address byte with the Left
or Right mixer bit set. The addressed channel will immediately
be enabled, using the previously-set attenuation level.
Furthermore, once a channel is addressed the attenuation level
can be varied by sending additional data bytes. For example,
fading a channel can be accomplished by simply incrementing
the data value sent to the SSM2163.
Serial Data Output
The MSB of the shift register is available on the serial DATA
OUTPUT pin. This output can be connected to the input of
another SSM2163 to permit “daisy-chain” operation. See
Figure 26 for a typical application. The DATA OUTPUT pin
swings between the digital power supply rails (i.e., from VDD to
VSS).
Logic Levels
All of the SSM2163 logic inputs have TTL and CMOS
compatible thresholds. However, the allowable voltage range
for these inputs extends from VDD to VSS.
Power Supplies and Decoupling
The SSM2163 operates from either single or dual (split) power
supplies. In either case, proper supply decoupling is important
to maximize audio performance.
To reduce noise, separate pins are provided for the digital and
analog power supply connections. These pins should be
connected together (VDD to VCC and VEE to VSS) as close to the
SSM2163 package as possible (Figures 22a, 22b, 22c, power
supply connections).
Single Supply Operation
The SSM2163 will operate with a single power supply of +5 V
to +14 V. Single supply operation simplifies design and reduces
system cost in multimedia applications, battery powered
systems, and similar designs. The SSM2163 provides about
2 dB of headroom (to 1% THD+N) when operating from a
single +5 V supply.
The key to operating from a single supply is to reference all
analog common connections to a voltage midway between the
supply and ground. To simplify single supply operation, the
SSM2163 provides a buffered pseudo-ground reference (ACOM)
on Pin 13. This reference, shown in Figure 23, provides a low
impedance output at approximately one half of the supply
voltage. Connect Analog Ground (Pin 17) to the ACOM output
(Pin 13) for single supply operation. To minimize noise caused
by modulation of the pseudo-ground, Pin 13 should be bypassed to
power supply ground with 0.1 µF and 10 µF capacitors.
REV. 0
–11–
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