MX029J Просмотр технического описания (PDF) - MX-COM Inc
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MX029J Datasheet PDF : 13 Pages
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Dual Digitally Controlled Amplifier
6
5. Control Data and Timing
MX029
The gain and I/O signal path for each section (Channels 1 and 2) is set individually by a 14-bit data word (D0
to D13). Data is loaded on the rising edge of the Serial Clock. Loaded data is executed on the rising edge of
the Load/Latch pulse. The 14-bit word consists of 1 channel address bit (D7) for selection of the channel to
be programmed, 6 bits for setting the gain/attenuation level (D8-D13), 3 bits for input selection (D4 and D6),
and 4 bits for output settings (D0-D3). This format is illustrated in Figure 3.
D13 D12 D11 D10 D9
D8
G G G G G G
SET SET SET SET SET SET
GAIN/ATTN LEVEL
D7
CHAN
ADDR
CHANNEL
ADDRESS
D6 D5 D4
IN IN IN
SEL SEL SEL
INPUT SELECT
D3
OUT
SET
D2
D1
OUT
SET
OUT
SET
OUTPUT
SETTINGS
D0
OUT
SET
Figure 3: Data Word Format
Tables 1-5 show how the data word is used to control channel selection, gain/attenuation, input selection and
output settings, respectively.
To calculate the data word used to control channel gain/attenuation use the following formula:
25 +
gain
2
dB
=
The
decimal
equivalent
of
binary
Data
Word
For example: using a gain of +34dB,
25 + +342dB
=
42
=
$2A
=
D13 - D8
101010
D13
D12
D11
D10
D9
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
1
D8 GAIN SET (dB)
0
MUTE
1
-48
0
-46
1
-44
0
1
1
0
0
1
0
1
0
1
1
1
0
+42
1
0
1
1
1
1
+44
1
1
0
0
0
0
+46
1
1
0
0
0
1
+48
1
1
0
0
1
0
+48
1
1
0
0
1
1
+48
Table 1: Gain/Attenuation Level
1998 MX-COM, INC.
www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054
Doc. # 20480096.008
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA. All trademarks and service marks are held by their respective companies.
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