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DAC7800 Datasheet(PDF) 5 Page - Burr-Brown (TI) |
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DAC7800 Datasheet(HTML) 5 Page - Burr-Brown (TI) |
5 / 12 page ® 5 DAC7800, 01, 02 DAC7800 (CONT) DATA CS CLK t 1 t 5 UPD A UPD B t 3 t 7 CLR t 6 t 8 t 4 0V 5V 5V 5V 5V 0V NOTES: (1) All input signal rise and fall times are measured from 10% to 90% of +5V. t = t = 5ns. (2) Tim- ing measurement reference level is V + V 2 F R IH IL . t 2 PARAMETER MINIMUM t1 — Data Setup Time 15ns t2 — Data Hold Time 15ns t3 — Chip Select to CLK, 15ns Update, Data Setup Time t4 — Chip Select to CLK, 40ns Update, Data Hold Time t5 — CLK Pulse Width 40ns t6 — Clear Pulse Width 40ns t7 — Update Pulse Width 40ns t8 — CLK Edge to UPD A 15ns or UPD B TIMING CHARACTERISTICS VDD = +5V, VREF A = VREF B = +10V, TA = –40°C to +85°C. LOGIC TRUTH TABLE DAC A I AGND A R V V R I AGND B OUT A FB A REF A REF B FB B OUT B 20 V DD 2 1 3 4 21 22 23 24 DAC A Register 4 8 DAC A LS Input Reg DAC A MS Input Reg DAC B DAC B Register 4 8 12 DGND DAC B LS Input Reg DAC B MS Input Reg 19 16 15 5 18 17 UPD A1 A0 CS WR CLR DAC7801 14 6 DB7–DB0 12 12 BLOCK DIAGRAM PIN CONFIGURATION 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 A CS DB0 DB1 DB2 DB3 DB4 DB5 DGND AGND B I R V V UPD WR CLR A1 A0 DB7 DB6 OUT A FB A REF A FB B REF B DD OUT B DAC7801 Top View DIP I R V DAC7801 CLR UPD CS WR A1 A0 FUNCTION 1 1 1 X X X No Data Transfer 1 1 X 1 X X No Data Transfer 0 X X X X X All Registers Cleared 1 1 0 0 0 0 DAC A LS Input Register Loaded with DB7–DB0 (LSB) 1 1 0 0 0 1 DAC A MS Input Register Loaded with DB3 (MSB)–DB0 1 1 0 0 1 0 DAC B LS Input Register Loaded with DB7–DB0 (LSB) 1 1 0 0 1 1 DAC B MS Input Register Loaded with DB3 (MSB)–DB0 1 0 1 0 X X DAC A, DAC B Registers Updated Simultaneously from Input Registers 1 0 0 0 X X DAC A, DAC B Registers are Transparent X = Don’t care. |
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