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Teilenummer | MX029 |
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Beschreibung | Dual Digitally Controlled Amplifier | |
Hersteller | CML | |
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Gesamt 13 Seiten DATA BULLETIN
MX029 Dual Digitally Controlled Amplifier
PRELIMINARY INFORMATION
Features
Applications
2 Digitally Controlled Amplifiers
Cellular and LMR Radios
±48dB Gain/Attenuation in 2dB Steps + Mute PABX’s, Electronic Mail, TAM's
Individual Control with a 14-Bit Serial Word Automatic Test Equipment
Separate Fixed Gain Buffer Amplifier
Remote Gain Adjustments
Digitally Set Audio Control Levels
SERIAL CLOCK
DATA INPUT
LOAD/LATCH
SERIAL
INTERFACE
VDD
VSS
BIAS
CH1, INPUT 1
CH1, INPUT 2
CH1, INPUT 3
CH2, INPUT 1
CH2, INPUT 2
UNIVERSAL
AMP IN
STAGE 1 CONTROL REGISTER
VSS BIAS
CH1, OUTPUT 1
∆G
CH1, OUTPUT 2
TO STAGE 1
CONTROL
REGISTER
VSS BIAS
STAGE 1 CONTROL REGISTER
VSS BIAS
∆G CH2, OUTPUT 1
UNIVERSAL
AMP OUT
BIAS
The MX029 Digitally Controlled Amplifier Array replaces audio level controls in radio and wireline
communications applications. It is a single-chip LSI circuit comprised of two discrete, digitally controlled gain
sections. Each section has 48 distinct gain steps (+/-48dB of range in 2dB steps) plus MUTE.
As shown in Figure 1, both gain stages have switchable inputs. This switching allows for selection of three
different input signals on one channel and two on the other channel. One of the channels also has output
switching. In addition to two digitally controlled gain stages, there is a general purpose inverting amplifier.
The gain of this amplifier is controlled externally via negative feedback. Control of each gain control section is
accomplished through the serial interface. All switching is accomplished using controlled rise and fall times,
thereby assuring no transients (clicks or pops).
The MX029 requires a single 5-volt supply and is available in the following packages: 16-pin SOIC
(MX029DW), 16-pin CDIP (MX029J), and 24-pin TSSOP (MX029TN).
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.
Dual Digitally Controlled Amplifier
5. Control Data and Timing
6
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
0000
0000
0000
0000
D9
0
0
1
1
D8 GAIN SET (dB)
0 MUTE
1 -48
0 -46
1 -44
011001
0
101110
101111
110000
110001
110010
110011
Table 1: Gain/Attenuation Level
+42
+44
+46
+48
+48
+48
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.
6 Page Dual Digitally Controlled Amplifier
12
A
B
PIN 1
K
H K1 C
L
J J1
F
P
E1 E
T
MX029
Package Tolerances
DIM. MIN. TYP. MAX.
A 0.753 (19.13)
0.767 (19.48)
B 0.285 (7.24)
0.291 (7.39)
C 0.165 (4.19)
0.230 (5.84)
E 0.370 (9.40)
0.415 (10.53)
E1 0.300 (7.61)
0.317 (8.04)
F 0.70 (17.78)
H 0.020 (0.51)
J 0.018 (0.46)
J1 0.055 (1.39)
K 0.053 (1.33)
0.080 (2.03)
K1 0.075 (1.91)
0.080 (2.03)
L 0.115 (2.92)
0.200 (5.08)
P 0.100 (2.54)
T 0.0098 (0.249)
0.0102 (0.259)
NOTE : All dimensions in inches (mm.)
Angles are in degrees
Figure 7: 16-pin CDIP Mechanical Outline: Order as part no. MX029J
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.
12 Page | ||
Seiten | Gesamt 13 Seiten | |
PDF Download | [ MX029 Schematic.PDF ] |
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