AD7628TQ Ver la hoja de datos (PDF) - Analog Devices
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AD7628TQ Datasheet PDF : 8 Pages
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AD7628
DIGITALLY CONTROLLED DUAL
TELEPHONE ATTENUATOR
In this configuration, the AD7628 functions as a 2-channel
digitally controlled attenuator; ideal for stereo audio and tele-
phone signal level control applications. Table IV gives input
codes vs. attenuation for a 0 dB to 15.5 dB range.
Input Code = 256 × 10 exp
−
Attenuation,
20
dB
MECHANICAL INFORMATION
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
20-Pin Cerdip (Q Suffix)
20-Pin Plastic DIP (N Suffix)
Figure 15. Digitally Controlled Dual Telephone Attenuator
Table IV. Attenuation vs. DAC A, DAC B Code for the
Circuit of Figure 15
DAC Input
Attn. dB Code
Code in
DAC Input
Decimal Attn. dB Code
Code in
Decimal
0.0
1 1 1 1 1 1 1 1 255
8.0
0 1 1 0 0 1 1 0 102
0.5
1 1 1 1 0 0 1 0 242
8.5
0 1 1 0 0 0 0 0 96
1.0
1 1 1 0 0 1 0 0 228
9.0
0 1 0 1 1 0 1 1 91
1.5
1 1 0 1 0 1 1 1 215
9.5
0 1 0 1 0 1 1 0 86
2.0
1 1 0 0 1 0 1 1 203
10.0
0 1 0 1 0 0 0 1 81
2.5
1 1 0 0 0 0 0 0 192
10.5
0 1 0 0 1 1 0 0 76
3.0
1 0 1 1 0 1 0 1 181
11.0
0 1 0 0 1 0 0 0 72
3.5
1 0 1 0 1 0 1 1 171
11.5
0 1 0 0 0 1 0 0 68
4.0
1 0 1 0 0 0 1 0 162
12.0
0 1 0 0 0 0 0 0 64
4.5
1 0 0 1 1 0 0 0 152
12.5
0 0 1 1 1 1 0 1 61
5.0
1 0 0 1 0 0 0 0 144
13.0
0 0 1 1 1 0 0 1 57
5.5
1 0 0 0 1 0 0 0 136
13.5
0 0 1 1 0 1 1 0 54
6.0
1 0 0 0 0 0 0 0 128
14.0
0011001
51
6.5
0 1 1 1 0 0 1 121
14.5
0 0 1 1 0 0 0 0 48
7.0
0 1 1 1 0 0 1 0 114
15.0
0 0 1 0 1 1 1 0 46
7.5
0 1 1 0 1 1 0 0 108
15.5
0 0 1 0 1 0 1 1 43
20-Terminal
Leadless Chip
Carrier (E Suffix)
20-Terminal
Plastic Leaded
Chip Carrier (P Suffix)
–8–
REV. A
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