AD7528KR Analog Devices, AD7528KR Datasheet - Page 8

• Manufacturer Part Number: AD7528KR
• Description: CMOS Dual 8-Bit Buffered Multiplying DAC
• Manufacturer: Analog Devices

AD7528
DIGITALLY CONTROLLED DUAL TELEPHONE
ATTENUATOR
In this configuration the AD7528 functions as a 2-channel digi-
tally controlled attenuator. Ideal for stereo audio and telephone
signal level control applications. Table IV gives input codes vs.
attenuation for a 0 dB to 15.5 dB range.
Figure 15. Digitally Controlled Dual Telephone Attenuator
0.14 (3.56)
0.125 (3.18)
0.0118 (0.30)
0.0040 (0.10)
0.20 (5.0)
0.15 (3.8)
PIN 1
20
V
V
1
LEADS ARE SOLDER OR TIN-PLATED KOVAR OR ALLOY 42
PIN 1
IN
Input Code = 256
OUT
A
0.07 (1.78)
0.05 (1.27)
20
B
1
0.5118 (13.00)
0.4961 (12.60)
0.0500
(1.27)
BSC
LEAD NO. 1 IDENTIFIED BY DOT OR NOTCH
V
DD
0.935 (23.75)
0.97 (24.64)
0.0192 (0.49)
0.0138 (0.35)
A2
0.016 (0.41)
20-Lead Cerdip (Q-20)
0.02 (0.5)
20-Lead SOIC (R-20)
0.1043 (2.65)
0.0926 (2.35)
11
10
AD7528
0.11 (2.79)
0.09 (2.28)
DAC A
SEATING
PLANE
10 exp
0.2992 (7.60)
0.2914 (7.40)
DAC B
11
10
DB7
0.4193 (10.65)
0.3937 (10.00)
DB0
0.28 (7.11)
0.24 (6.1)
0.0125 (0.32)
0.0091 (0.23)
0.125 (3.17)
SEATING
PLANE
0.14 (3.56)
DATA BUS
Attenuation dB
SUGGESTED
OP AMP: AD644
A1
DAC A/DAC B
8
0
20
CS
V
WR
IN
0.0291 (0.74)
0.0098 (0.25)
15
0
B
0.32 (8.128)
0.29 (7.366)
Dimensions shown in inches and (mm).
,
V
OUT
OUTLINE DIMENSIONS
0.0500 (1.27)
0.0157 (0.40)
0.011 (0.28)
0.009 (0.23)
A
45
–8–
Table IV. Attenuation vs. DAC A, DAC B Code for the Circuit
of Figure 15
Attn. DAC Input
dB
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
For further applications information the reader is referred to
Analog Devices Application Note on the AD7528.
0.145 (3.683)
0.125 (3.175)
0.048 (1.21)
0.042 (1.07)
Code
1 1 1 1 1 1 1 1
1 1 1 1 0 0 1 0
1 1 1 0 0 1 0 0
1 1 0 1 0 1 1 1
1 1 0 0 1 0 1 1
1 1 0 0 0 0 0 0
1 0 1 1 0 1 0 1
1 0 1 0 1 0 1 1
1 0 1 0 0 0 1 0
1 0 0 1 1 0 0 0
1 0 0 1 0 0 0 0
1 0 0 0 1 0 0 0
1 0 0 0 0 0 0 0
0 1 1 1 1 0 0 1
0 1 1 1 0 0 1 0
0 1 1 0 1 1 0 0
MIN
MIN
20-Lead Plastic Leaded Chip Carrier (P-20A)
(0.51)
MAX
0.021 (0.533)
0.015 (0.381)
0.02
LEADS ARE SOLDER OR TIN-PLATED KOVAR OR ALLOY 42
0.02 (0.51)
20
1
MAX
4
8
LEAD NO. 1 IDENTIFIED BY DOT OR NOTCH
0.395 (10.02)
PIN 1
0.385 (9.78)
0.356 (9.04)
0.350 (8.89) SQ
20-Lead Plastic DIP (N-20)
3
(PINS DOWN)
9
TOP VIEW
IDENTIFIER
1.07 (27.18) MAX
PIN 1
0.11 (2.79)
0.09 (2.28)
Code In
Decimal
255
242
228
215
203
192
181
171
162
152
144
136
128
121
114
108
19
13
SQ
18
14
0.065 (1.66)
0.045 (1.15)
0.050
(1.27)
BSC
Attn. DAC Input
dB
88.0
88.5
89.0
89.5
10.0
10.5
11.0
11.5
12.0
12.5
13.0
13.5
14.0
14.5
15.0
15.5
10
11
0.180 (4.47)
0.165 (4.19)
0.060 (1.53)
0.255 (6.477)
0.245 (6.223)
SEATING
PLANE
0.135 (3.429)
0.125 (3.17)
MIN
Code
0 1 1 0 0 1 1 0
0 1 1 0 0 0 0 0
0 1 0 1 1 0 1 1
0 1 0 1 0 1 1 0
0 1 0 1 0 0 0 1
0 1 0 0 1 1 0 0
0 1 0 0 1 0 0 0
0 1 0 0 0 1 0 0
0 1 0 0 0 0 0 0
0 0 1 1 1 1 0 1
0 0 1 1 1 0 0 1
0 0 1 1 0 1 1 0
0 0 1 1 0 0 1 1
0 0 1 1 0 0 0 0
0 0 1 0 1 1 1 0
0 0 1 0 1 0 1 1
0.12 (3.05)
0.09 (2.29)
0.021 (0.53)
0.013 (0.33)
0.032 (0.81)
0.026 (0.66)
0.025 (0.64)
MIN
0.020 (0.51) MIN
15
0
0.32 (8.128)
0.30 (7.62)
0.011 (0.28)
0.009 (0.23)
Code In
Decimal
REV. B
102
96
91
86
81
76
72
68
64
61
57
54
51
48
46
43