參數(shù)資料
型號： AD7111ABNZ
廠商： Analog Devices Inc
文件頁數(shù)： 5/8頁
文件大?。?/td> 0K
描述： IC DAC LOGARITHMIC 16-DIP
產(chǎn)品培訓(xùn)模塊： Data Converter Fundamentals
DAC Architectures
產(chǎn)品變化通告： AD7111A Discontinuation 27/Feb/2012
標(biāo)準(zhǔn)包裝： 25
系列： LOGDAC®
位數(shù)： 17
轉(zhuǎn)換器數(shù)目： 1
電壓電源： 單電源
功率耗散（最大）： 1W
工作溫度： -40°C ~ 85°C
安裝類型： 通孔
封裝/外殼： 16-DIP（0.300"，7.62mm）
供應(yīng)商設(shè)備封裝： 16-PDIP
包裝： 管件
輸出數(shù)目和類型： 1 電流，單極
采樣率（每秒）： *
產(chǎn)品目錄頁面： 784 (CN2011-ZH PDF)
AD7111/AD7111A
REV. 0
–5–
PIN CONFIGURATIONS
Write Cycle Timing Diagram
CIRCUIT DESCRIPTION
GENERAL CIRCUIT DESCRIPTION
The AD7111/AD7111A consists of a 17-bit R-2R CMOS mul-
tiplying D/A converter with extensive digital logic. The logic
translates the 8-bit binary input into a 17-bit word which is
used to drive the D/A converter. Input data on the D7-D0 bus
is loaded into the input data latches using CS and WR control
signals. When using the AD7111, the rising edge of WR latches
the input data and initiates the internal data transfer to the de-
coder. A minimum time tRFSH, the refresh time, is required for
the data to propagate through the decoder before a new data
write is attempted.
In contrast, the AD7111A WR input is level triggered to allow
transparent operation of the latches if required.
The transfer function for the circuit of Figure 1 is given by:
VO = –VIN 10 exp –
0. 375 N
20
or
VO
VIN
dB = –0.375 N
where 0.375 is the step size (resolution) in dB and N is the in-
put code in decimal for values 0 to 239. For 240
≤ N ≤ 255 the
output is zero. Table I gives the output attenuation relative to
0 dB for all possible input codes.
Figure 1. Typical Circuit Configuration
The graphs on the last page give a pictorial representation of the
specified accuracy and monotonic ranges for all grades of the
AD7111/AD7111A. High attenuation levels are specified with
less accuracy than low attenuation levels. The range of mono-
tonic behavior depends upon the attenuation step size used.
DIP/SOIC
LCCC
Table I. Ideal Attenuation in dB vs. Input Code
D7-D4
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
0000
0.0
0.375
0.75
1.125
1.5
1.875
2.25
2.625
3.0
3.375
3.75
4.125
4.5
4.875
5.25
5.625
0001
6.0
6.375
6.75
7.125
7.5
7.875
8.25
8.625
9.0
9.375
9.75
10.125 10.5
10.875 11.25
11.625
0010
12.0
12.375 12.75
13.125 13.5
13.875 14.25
14.625 15.0
15.375 15.75
16.125 16.5
16.875 17.25
17.625
0011
18.0
18.375 18.75
19.125 19.5
19.875 20.25
20.625 21.0
21.375 21.75
22.125 22.5
22.875 23.25
23.625
0100
24.0
24.375 24.75
25.125 25.5
25.875 26.25
26.625 27.0
27.375 27.75
28.125 28.5
28.875 29.25
29.625
0101
30.0
30.375 30.75
31.125 31.5
31.875 32.25
32.625 33.0
33.375 33.75
34.125 34.5
34.875 35.25
35.625
0110
36.0
36.375 36.75
37.125 37.5
37.875 38.25
38.625 39.0
39.375 39.75
40.125 40.5
40.875 41.25
41.625
0111
42.0
42.375 42.75
43.125 43.5
43.875 44.25
44.625 45.0
45.375 45.75
46.125 46.5
46.875 47.25
47.625
1000
48.0
48.375 48.75
49.125 49.5
49.875 50.25
50.625 51.0
51.375 51.75
52.125 52.5
52.875 53.25
53.625
1001
54.0
54.375 54.75
55.125 55.5
55.875 56.25
56.625 57.0
57.375 57.75
58.125 58.5
58.875 59.25
59.625
1010
60.0
60.375 60.75
61.125 61.5
61.875 62.25
62.625 63.0
63.375 63.75
64.125 64.5
64.875 65.25
65.625
1011
66.0
66.375 66.75
67.125 67.5
67.875 68.25
68.625 69.0
69.375 69.75
70.125 70.5
70.875 71.25
71.625
1100
72.0
72.375 72.75
73.125 73.5
73.875 74.25
74.625 75.0
75.375 75.75
76.125 76.5
76.875 77.25
77.625
1101
78.0
78.375 78.75
79.125 79.5
79.875 80.25
80.625 81.0
81.375 81.75
82.125 82.5
82.875 83.25
83.625
1110
84.0
84.375 84.75
85.125 85.5
85.875 86.25
86.625 87.0
87.375 87.75
88.125 88.5
88.875 89.25
89.625
1111
MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE
D3-D0
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