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AD7112CN Scheda tecnica(PDF) 5 Page - Analog Devices

Il numero della parte AD7112CN
Spiegazioni elettronici  LC2MOS LOGDAC Dual Logarithmic D/A Converter
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD7112CN Scheda tecnica(HTML) 5 Page - Analog Devices

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AD7112
REV. 0
–5–
CIRCUIT DESCRIPTION
GENERAL CIRCUIT INFORMATION
The AD7112 consists of a dual 17-bit R-2R CMOS multiplying
D/A converter with extensive digital logic. Figure 1 shows a sim-
plified circuit of the D/A converter section of the AD7112. The
logic translates the 8-bit binary input into a 17-bit word which is
used to drive the D/A converter. Figure 2 shows a typical circuit
configuration for the AD7112.
The transfer function for the circuit of Figure 2 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
input 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.
R
2R
VINA
RR
2R
2R
2R
2R
R
RFB A
OUT A
AGND
S1
S2
S3
S17
Figure 1. Simplified D/A Circuit of 1/2 AD7112
Figures 16 and 17 give a pictorial representation of the specified
accuracy and monotonic ranges for all grades of the AD7112.
High attenuation levels are specified with less accuracy than low
attenuation levels. The range of monotonic behavior depends
upon the attenuation step size used. To achieve monotonic op-
eration over the entire 88.5 dB range, it is necessary to select in-
put codes so that the attenuation step size at any point is
consistent with the step size guaranteed for monotonic opera-
tion at that point.
OUT A
AGND
DAC A
AD7112
DGND
CS
WR
RFB A
VIN A
DAC A/DAC B
VDD
15
4
3
17
5
2
1
VOUT
A1
C1
SIGNAL
GROUND
A1: 1/2 AD712
1/2 OP-275
6
16
NOTES
1. ONLY ONE DAC IS SHOWN FOR CLARITY.
2. DATA INPUT CONNECTIONS ARE OMITTED.
3. C1 PHASE COMPENSATION (5–15pF) MAY BE REQUIRED WHEN
USING HIGH SPEED AMPLIFIER.
Figure 2. Typical Circuit Configuration
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
0.000
0.375
0.750
1.125
1.500
1.875
2.250
2.625
3.000
3.375
3.750
4.125
4.500
4.875
5.250
5.625
0001
6.000
6.375
6.750
7.125
7.500
7.875
8.250
8.625
9.000
9.375
9.750
10.125
10.500
10.875
11.250
11.625
0010
12.000
12.375
12.750
13.125
13.500
13.875
14.250
14.625
15.000
15.375
15.750
16.125
16.500
16.875
17.250
17.625
0011
18.000
18.375
18.750
19.125
19.500
19.875
20.250
20.625
21.000
21.375
21.750
22.125
22.500
22.875
23.250
23.625
0100
24.000
24.375
24.750
25.125
25.500
25.875
26.250
26.625
27.000
27.375
27.750
28.125
28.500
28.875
29.250
29.625
0101
30.000
30.375
30.750
31.125
31.500
31.875
32.250
32.625
33.000
33.375
33.750
34.125
34.500
34.875
35.250
35.625
0110
36.000
36.375
36.750
37.125
37.500
37.875
38.250
38.625
39.000
39.375
39.750
40.125
40.500
40.875
41.250
41.625
0111
42.000
42.375
42.750
43.125
43.500
43.875
44.250
44.625
45.000
45.375
45.750
46.125
46.500
46.875
47.250
47.625
1000
48.000
48.375
48.750
49.125
49.500
49.875
50.250
50.625
51.000
51.375
51.750
52.125
52.500
52.875
53.250
53.625
1001
54.000
54.375
54.750
55.125
55.500
55.875
56.250
56.625
57.000
57.375
57.750
58.125
58.500
58.875
59.250
59.625
1010
60.000
60.375
60.750
61.125
61.500
61.875
62.250
62.625
63.000
63.375
63.750
64.125
64.500
64.875
65.250
65.625
1011
66.000
66.375
66.750
67.125
67.500
67.875
68.250
68.625
69.000
69.375
69.750
70.125
70.500
70.875
71.250
71.625
1100
72.000
72.375
72.750
73.125
73.500
73.875
74.250
74.625
75.000
75.375
75.750
76.125
76.500
76.875
77.250
77.625
1101
78.000
78.375
78.750
79.125
79.500
79.875
80.250
80.625
81.000
81.375
81.750
82.125
82.500
82.875
83.250
83.625
1110
84.000
84.375
84.750
85.125
85.500
85.875
86.250
86.625
87.000
87.375
87.750
88.125
88.500
88.875
89.250
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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