Datenblatt-Suchmaschine für elektronische Bauteile |
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AD7853LAR Datenblatt(PDF) 5 Page - Analog Devices |
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AD7853LAR Datenblatt(HTML) 5 Page - Analog Devices |
5 / 34 page REV. B –5– AD7853/AD7853L TYPICAL TIMING DIAGRAMS Figures 2 and 3 show typical read and write timing diagrams. Figure 2 shows the reading and writing after conversion in In- terface Modes 2 and 3. To attain the maximum sample rate of 100 kHz (AD7853L) or 200 kHz (AD7853) in Interface Modes 2 and 3, reading and writing must be performed during conver- sion. Figure 3 shows the timing diagram for Interface Modes 4 and 5 with sample rate of 100 kHz (AD7853L) or 200 kHz (AD7853). At least 400 ns acquisition time must be allowed (the time from the falling edge of BUSY to the next rising edge of CONVST) before the next conversion begins to ensure that the part is settled to the 12-bit level. If the user does not want to provide the CONVST signal, the conversion can be initiated in software by writing to the control register. TO OUTPUT PIN +2.1V IOH 1.6mA 200 A IOL CL 100pF Figure 1. Load Circuit for Digital Output Timing Specifications POLARITY PIN LOGIC HIGH SYNC (I/P) SCLK (I/P) t 3 BUSY (O/P) CONVST (I/P) t 2 t 1 t 5 t 11 t 6 t 9 t 10 15 6 16 t 12 t 6 DOUT (O/P) DB0 DB11 t 8 DB15 DB0 THREE- STATE DB11 THREE- STATE DB15 t CONVERT t 7 t CONVERT = 4.6 s MAX, 10 s FOR L VERSION t 1 = 100 ns MIN, t5 = 50/90 ns MAX 5V/3V, t7 = 40/60 ns MIN 5V/3V Figure 2. AD7853/AD7853L Timing Diagram (Typical Read and Write Operation for Interface Modes 2, 3) POLARITY PIN LOGIC HIGH SYNC (O/P) DOUT (O/P) SCLK (O/P) DB0 DB11 t 4 t 8 DIN (I/P) DB15 DB0 THREE- STATE BUSY (O/P) CONVST (I/P) DB11 t 2 t 1 t 7 t 11 t 6 t 9 t 10 THREE- STATE 15 6 16 t 12 t 5 DB15 t CONVERT t CONVERT = 4.6 s MAX, 10 s FOR L VERSION t 1 = 100 ns MIN, t5 = 50/90 ns MAX 5V/3V, t7 = 40/60 ns MIN 5V/3V Figure 3. AD7853/AD7853L Timing Diagram (Typical Read and Write Operation for Interface Modes 4, 5) |
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