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參數資料
| 型號： | EVAL-AD7851CB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 14-Bit 333 kSPS Serial A/D Converter |
| 中文描述： | 14位333 kSPS的串行A / D轉換器 |
| 文件頁數： | 5/36頁 |
| 文件大小： | 435K |
| 代理商： | EVAL-AD7851CB |
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–5–
REV. A
AD7851
T Y PICAL T IMING 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. T o 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 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
C
L
50pF
TO
OUTPUT
PIN
I
OL
I
OH
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
1
5
6
16
t
12
DOUT (O/P)
DB0
DB11
t
8
DIN (I/P)
3-STATE
3-STATE
DB15
t
CONVERT
t
CONVERT
= 3.25μs MAX, t
= 100ns MIN,
t
5
7
= 30ns MIN
t
1
t
6
t
7
Figure 2. AD7851 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
1
5
6
16
DOUT (O/P)
DB0
DB11
t
8
DIN (I/P)
DB15
DB0
3-STATE
DB11
3-STATE
DB15
t
CONVERT
t
CONVERT
= 3.25μs MAX, t
= 100ns MIN,
t
5
7
= 30ns MIN
t
1
t
6
t
7
Figure 3. AD7851 Timing Diagram (Typical Read and Write Operation for Interface Modes 4, 5)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| EVAL-AD7851CB4 | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit 333 kSPS Serial A/D Converter |
| EVAL-AD7853CB | 制造商:Analog Devices 功能描述:EVALUATION CONTROL BOARD - Bulk |
| EVAL-AD7854CB | 制造商:Analog Devices 功能描述:EVALUATION CONTROL BOARD - Bulk |
| EVAL-AD7856CB | 制造商:AD 制造商全稱:Analog Devices 功能描述:5 V Single Supply, 8-Channel 14-Bit 285 kSPS Sampling ADC |
| EVAL-AD7858CB | 制造商:Analog Devices 功能描述:EVALUATION CONTROL BOARD - Bulk |
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