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AD7853L Arkusz danych(PDF) 5 Page - Analog Devices

Numer części AD7853L
Szczegółowy opis  3 V to 5 V Single Supply, 200 kSPS 12-Bit Sampling ADCs
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD7853L Arkusz danych(HTML) 5 Page - Analog Devices

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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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