AD7628
DIGITALLY CONTROLLED DUAL
TELEPHONE ATTENUATOR
MECHANICAL INFORMATION
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
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.
Attenuation, dB
20
20-Pin Cerdip (Q Suffix)
C1029a–8–3/88
Input Code = 256
×
10 exp
−
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
20-Terminal
Leadless Chip
Carrier (E Suffix)
–8–
REV. A
PRINTED IN U.S.A.
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
11111111
11110010
11100100
11010111
11001011
11000000
10110101
10101011
10100010
10011000
10010000
10001000
10000000
0111001
01110010
01101100
255
242
228
215
203
192
181
171
162
152
144
136
128
121
114
108
8.0
8.5
9.0
9.5
10.0
10.5
11.0
11.5
12.0
12.5
13.0
13.5
14.0
14.5
15.0
15.5
01100110
01100000
01011011
01010110
01010001
01001100
01001000
01000100
01000000
00111101
00111001
00110110
0011001
00110000
00101110
00101011
102
96
91
86
81
76
72
68
64
61
57
54
51
48
46
43
20-Terminal
Plastic Leaded
Chip Carrier (P Suffix)
AD [ ANALOG DEVICES ]
