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AD7528SQ Datasheet(数据表) 8 Page - Analog Devices

部件型号  AD7528SQ
说明  CMOS Dual 8-Bit Buffered Multiplying DAC
下载  8 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
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AD7528
REV. B
–8–
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.
Input Code = 256
10 exp


Attenuation dB
,
20
VIN B
VOUT A
VIN A
DATA BUS
DAC A/DAC B
CS
WR
AD7528
DB0
DB7
DAC A
DAC B
VDD
VOUT B
A1
A2
SUGGESTED
OP AMP: AD644
Figure 15. Digitally Controlled Dual Telephone Attenuator
Table IV. Attenuation vs. DAC A, DAC B Code for the Circuit
of Figure 15
Attn. DAC Input
Code In
Attn. DAC Input
Code In
dB
Code
Decimal
dB
Code
Decimal
0.0
1 1 1 1 1 1 1 1
255
88.0
0 1 1 0 0 1 1 0
102
0.5
1 1 1 1 0 0 1 0
242
88.5
0 1 1 0 0 0 0 0
96
1.0
1 1 1 0 0 1 0 0
228
89.0
0 1 0 1 1 0 1 1
91
1.5
1 1 0 1 0 1 1 1
215
89.5
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
0 0 1 1 0 0 1 1
51
6.5
0 1 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
For further applications information the reader is referred to
Analog Devices Application Note on the AD7528.
20-Lead Cerdip (Q-20)
0.97 (24.64)
0.935 (23.75)
SEATING
PLANE
0.02 (0.5)
0.016 (0.41)
0.07 (1.78)
0.05 (1.27)
0.15 (3.8)
0.125 (3.18)
0.20 (5.0)
0.14 (3.56)
0.11 (2.79)
0.09 (2.28)
20
110
11
0.28 (7.11)
0.24 (6.1)
PIN 1
0.14 (3.56)
0.125 (3.17)
15
0
0.32 (8.128)
0.29 (7.366)
0.011 (0.28)
0.009 (0.23)
LEAD NO. 1 IDENTIFIED BY DOT OR NOTCH
LEADS ARE SOLDER OR TIN-PLATED KOVAR OR ALLOY 42
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
20-Lead Plastic DIP (N-20)
SEATING
PLANE
0.021 (0.533)
0.015 (0.381)
0.065 (1.66)
0.045 (1.15)
0.11 (2.79)
0.09 (2.28)
0.145 (3.683)
MIN
0.125 (3.175)
MIN
20
110
11
PIN 1
1.07 (27.18) MAX
0.255 (6.477)
0.245 (6.223)
0.32 (8.128)
0.30 (7.62)
0.011 (0.28)
0.009 (0.23)
0.135 (3.429)
0.125 (3.17)
15
0
LEAD NO. 1 IDENTIFIED BY DOT OR NOTCH
LEADS ARE SOLDER OR TIN-PLATED KOVAR OR ALLOY 42
20-Lead SOIC (R-20)
SEATING
PLANE
0.0118 (0.30)
0.0040 (0.10)
0.0192 (0.49)
0.0138 (0.35)
0.1043 (2.65)
0.0926 (2.35)
0.0500
(1.27)
BSC
0.0125 (0.32)
0.0091 (0.23)
0.0500 (1.27)
0.0157 (0.40)
8
0
0.0291 (0.74)
0.0098 (0.25)
45
11
20
10
1
0.5118 (13.00)
0.4961 (12.60)
0.4193 (10.65)
0.3937 (10.00)
0.2992 (7.60)
0.2914 (7.40)
PIN 1
20-Lead Plastic Leaded Chip Carrier (P-20A)
0.021 (0.53)
0.013 (0.33)
0.032 (0.81)
0.026 (0.66)
0.180 (4.47)
0.165 (4.19)
0.12 (3.05)
0.09 (2.29)
0.020 (0.51) MIN
0.025 (0.64)
MIN
0.060 (1.53)
MIN
3
PIN 1
IDENTIFIER
4
19
18
8
9
14
13
TOP VIEW
(PINS DOWN)
0.356 (9.04)
0.350 (8.89)
SQ
0.048 (1.21)
0.042 (1.07)
0.02
(0.51)
MAX
0.050
(1.27)
BSC
0.02 (0.51)
MAX
0.395 (10.02)
0.385 (9.78)
SQ




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