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APPLICATION NOTE
MX009 and MX019 Amplifier Array
The MX009 and MX019 offer 8 and 4 digitally controlled gain/attenuation amplifiers respectively. MX009 7 Amplifiers 1 Amplifier MX019 3 Amplifiers 1 Amplifier +3dB to -3dB adjustment range in 0.43dB steps +15dB to -15dB adjustment range in 2dB steps
In certain applications it may be necessary to trim over a wider dynamic range or use smaller step sizes. This can be achieved by grouping the amplifier stages together either in series or parallel. The 2 following examples show a typical application of: 1. Series connection of 2 amplifiers to achieve trimming over a 30dB dynamic range in 0.43dB steps. 2. Parallel connection of 2 amplifiers to achieve approximately 0.21dB steps over a 6dB dynamic range. Example 1: 0.43dB steps over a 30dB dynamic range This is achieved by connecting the volume amplifier stage in series with 1 of the other amplifier stages as shown in the diagram below.
A I/P
B O/P
Note: 1. A - MX009 Amplifier no. 8 (MX009 Amplifier no.4) (Volume). 2. B - Any of the MX009 Amplifiers 1 through 7 (MX019 Amplifiers 1 through 3)
(c) 1997 MX*COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc. # 20830073.001 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA.All trademarks and service marks are held by their respective companies.
Noise Immunity Circuit for the MX633/643 Call Progress Detectors
2
Application Note
Example 2: 0.21dB steps over a 6dB dynamic range A very fine step size of approximately 0.21dB can be obtained over a 6dB dynamic range by the connection of 2 amplifiers in parallel.
100k A
100k
C I/P 100k B O/P
Note: 1. A & B - Any MX009 Amplifiers 1 through 7 (MX019 Amplifiers 1 through 3) 2. C - Standard CMOS Amplifier. The table shows all possible combinations of gain on each of the 2 amplifiers, many of which are duplicated. The highlighted section shows 1 of the possible combinations to achieve an output dynamic of 6dB with approximately 0.21dB steps.
3.00 3.00 2.57 2.14 1.71 1.29 0.88 0.43 0.00 -0.43 -0.86 -1.29 -1.71 -2.14 -2.57 -3.00 3.00 2.79 2.58 2.38 2.19 1.99 1.81 1.83 1.45 1.28 1.12 0.96 0.80 0.65 0.51
2.57 2.79 2.57 2.36 2.15 1.95 1.76 1.57 1.38 1.20 1.03 0.86 0.69 0.53 0.38 0.22
2.14 2.58 2.36 2.14 1.93 1.72 1.52 1.33 1.14 0.95 0.77 0.60 0.43 0.26 0.10 -0.05
1.71 2.38 2.15 1.93 1.71 1.50 1.30 1.10 0.90 0.71 0.52 0.34 0.17 0.00 -0.17 -0.33
1.29 2.19 1.95 1.72 1.50 1.29 1.07 0.87 0.67 0.47 0.28 0.09 -0.09 -0.26 -0.43 -0.60
0.66 1.99 1.76 1.52 1.30 1.07 0.86 0.65 0.44 0.24 0.04 -0.15 -0.33 -0.51 -0.69 -0.86
0.43 1.81 1.57 1.33 1.10 0.87 0.65 0.43 0.22 0.01 -0.19 -0.39 -0.58 -0.76 -0.94 -1.12
0.00 1.83 1.38 1.14 0.90 0.67 0.44 0.22 0.00 -0.21 -0.42 -0.62 -0.81 -1.01 -1.19 -1.37
-0.43 1.45 1.20 0.95 0.71 0.47 0.24 0.01 -.021 -0.43 -0.84 -0.85 -1.05 -1.24 -1.43 -1.62
-0.86 1.28 1.03 0.77 0.52 0.28 0.04 -0.19 -0.42 -0.64 -0.86 -1.07 -1.28 -1.48 -1.67 -1.88
-1.29 1.12 0.86 0.60 0.34 0.09 -0.15 -0.39 -0.62 -0.85 -1.07 -1.29 -1.50 -1.70 -1.90 -2.10
-1.71 0.96 0.69 0.43 0.17 -0.09 -.033 -0.58 -0.81 -1.05 -1.28 -1.50 -1.71 -1.93 -2.13 -2.33
-2.14 0.80 0.53 0.26 0.00 -0.26 -0.51 -0.76 -1.01 -1.24 -1.48 -1.70 -1.93 -2.14 -2.35 -2.56
-2.57 0.65 0.38 0.10 -0.17 -0.43 -0.69 -0.94 -1.19 -1.43 -1.67 -1.90 -2.13 -2.35 -2.57 -2.78
-3.00 0.51 .022 -0.05 -0.33 -0.60 -0.86 -1.12 -1.37 -1.62 -1.86 -2.10 -2.33 -2.56 -2.78 -3.00
(c) 1997 MX*COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc. # 20830017.002 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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