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AD7528KR Datasheet(PDF) 8 Page - Analog Devices |
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AD7528KR Datasheet(HTML) 8 Page - Analog Devices |
8 / 8 page 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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