TLC7528C_15 Datasheet, PDF (12/28 Pages) Texas Instruments – DUAL 8-BIT MULTIPLYING DIGITAL-TO-ANALOG CONVERTERS

TLC7528C, TLC7528E, TLC7528I
DUAL 8ĆBIT MULTIPLYING
DIGITALĆTOĆANALOG CONVERTERS
SLAS062E − JANUARY 1987 − REVISED NOVEMBER 2008
APPLICATION INFORMATION
Table 3. Attenuation vs DACA, DACB Code
ATTEN (dB)
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
DAC INPUT CODE
11111111
11110010
11100100
11010111
11001011
11000000
10110101
10101011
10100010
10011000
10011111
10001000
10000000
01111001
01110010
01101100
CODE IN
DECIMAL
255
242
228
215
203
192
181
171
162
152
144
136
128
121
114
108
ATTN (dB)
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
DAC INPUT CODE
01100110
01100000
01011011
01010110
01010001
01001100
01001000
01000100
01000000
00111101
00111001
00110110
00110011
00110000
00101110
00101011
CODE IN
DECIMAL
102
96
91
86
81
76
72
68
64
61
57
54
51
48
46
43
programmable state-variable filter
This programmable state-variable or universal filter configuration provides low-pass, high-pass, and bandpass
outputs, and is suitable for applications requiring microprocessor control of filter parameters.
As shown in Figure 10, DACA1 and DACB1 control the gain and Q of the filter while DACA2 and DACB2 control
the cutoff frequency. Both halves of the DACA2 and DACB2 must track accurately in order for the
cutoff-frequency equation to be true. With the TLC7528, this validity is easy to achieve.
fc
+
2p
1
R1C1
The programmable range for the cutoff or center frequency is 0kHz to 15kHz with a Q ranging from 0.3 to 4.5.
This parameter defines the limits of the component values.
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