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DAC7802 Datasheet(PDF) 6 Page - Texas Instruments |
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DAC7802 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 23 page DAC7800, 7801, 7802 6 SBAS005A www.ti.com BLOCK DIAGRAM 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 AGND I R V CS A (LSB) DB0 DB1 DB2 DB3 DB4 DB5 DGND I R V V CS B WR DB11 (MSB) DB10 DB9 DB8 DB7 DB6 OUT A FB A REF A FB B REF B DD OUT B DAC7802 TIMING CHARACTERISTICS At VDD = +5V, and TA = –40oC to +85oC. PARAMETER MINIMUM t1 - Data Setup Time 20ns t2 - Data Hold Time 15ns t3 - Chip Select to Write Setup Time 30ns t4 - Chip Select to Write Hold Time 0ns t5 - Write Pulse Width 30ns LOGIC TRUTH TABLE CSA CSB WR FUNCTION X X 1 No Data Transfer 1 1 X No Data Transfer 0 A Rising Edge on CSA or CSB Loads Data to the Respective DAC 01 DAC A Register Loaded from Data Bus 10 DAC B Register Loaded from Data Bus 00 DAC A and DAC B Registers Loaded from Data Bus X = Don’t care. means rising edge triggered. PIN CONFIGURATION DAC7802 DATA 5V 0V 5V 5V CSA, CSB WR t 2 t 1 t 3 t 4 t 5 NOTES: (1) All input signal rise and fall times are measured from 10% to 90% of +5V. t R = tR = 5ns. (2) Timing measurement reference level is V IH + VIL 2 . CK DAC B DAC A 12 12 12 12 12 DGND 18 CS A 5 CS B 20 WR 19 21 V DD DAC7802 6 2 I 3 R OUT A FB A 23 R 24 I 1 AGND FB B OUT B DAC A Register CK DAC B Register DB11–DB0 4 22 V V REF A REF B Top View DIP |
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