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AD7851 Datenblatt(PDF) 6 Page - Analog Devices

Teilenummer AD7851
Bauteilbeschribung  14-Bit 333 kSPS Serial A/D Converter
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7851 Datenblatt(HTML) 6 Page - Analog Devices

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AD7851
–6–
REV. B
TYPICAL TIMING DIAGRAMS
Figures 2 and 3 show typical read and write timing diagrams.
Figure 2 shows the reading and writing after conversion in
Interface Modes 2 and 3. To attain the maximum sample rate of
285 kHz in Interface Modes 2 and 3, reading and writing must
be performed during conversion. Figure 3 shows the timing dia-
gram for Interface Modes 4 and 5 with sample rate of 285 kHz.
At least a 330 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 14-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.
1.6mA
2.1V
200µA
CL
50pF
TO
OUTPUT
PIN
IOL
IOH
Figure 1. Load Circuit for Digital Output Timing
Specifications
DB15
DB0
DB11
POLARITY PIN LOGIC HIGH
SYNC (I/P)
SCLK (I/P)
t
3
BUSY (O/P)
CONVST (I/P)
t
2
t
5
t
11
t
6
t
9
t
10
15
6
16
t
12
DOUT (O/P)
DB0
DB11
t
8
DIN (I/P)
THREE-STATE
THREE-STATE
DB15
t
CONVERT
t
CONVERT = 3.25µs MAX, t1 = 100ns MIN,
t
5 = 30ns MAX, t7 = 30ns MIN
t
1
t
6
t
7
Figure 2. Timing Diagram (Typical Read and Write Operation for Interface Modes 2, 3)
POLARITY PIN LOGIC HIGH
SYNC ( O/P)
SCLK (O/P)
t
4
BUSY (O/P)
CONVST (I/P)
t
2
t
5
t
11
t
12
t
9
t
10
15
6
16
DOUT (O/P)
DB0
DB11
t
8
DIN (I/P)
DB15
DB0
THREE-STATE
DB11
THREE-STATE
DB15
t
CONVERT
t
CONVERT = 3.25µs MAX, t1 = 100ns MIN,
t
5 = 30ns MAX, t7 = 30ns MIN
t
1
t
6
t
7
Figure 3. Timing Diagram (Typical Read and Write Operation for Interface Modes 4, 5)


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