AVDD = 2.7 V to 5.25 V, DV
參數(shù)資料
型號(hào): EVAL-AD7780EBZ
廠商: Analog Devices Inc
文件頁(yè)數(shù): 12/16頁(yè)
文件大小: 0K
描述: BOARD EVAL FOR AD7780
標(biāo)準(zhǔn)包裝: 1
ADC 的數(shù)量: 1
位數(shù): 24
采樣率(每秒): 16.7
數(shù)據(jù)接口: SPI?
輸入范圍: ±5 V
工作溫度: -40°C ~ 105°C
已用 IC / 零件: AD7780
已供物品:
AD7780
Rev. A | Page 5 of 16
TIMING CHARACTERISTICS
AVDD = 2.7 V to 5.25 V, DVDD = 2.7 V to 5.25 V, GND = 0 V, Input Logic 0 = 0 V, Input Logic 1 = DVDD, unless otherwise noted.
Table 3.
Parameter1
Limit at TMIN, TMAX
Unit
Test Conditions/Comments
Read2
t1
100
ns min
SCLK high pulse width
t2
100
ns min
SCLK low pulse width
t33
0
ns min
SCLK active edge to data valid delay4
60
ns max
DVDD = 4.75 V to 5.25 V
80
ns max
DVDD = 2.7 V to 3.6 V
t4
10
ns min
SCLK inactive edge to DOUT/RDY high
130
ns max
Reset
t5
100
ns min
PDRST low pulse width
t65
FILTER/GAIN change to data valid delay
120
ms typ
Update rate = 16.7 Hz
300
ms typ
Update rate = 10 Hz
1 Sample tested during initial release to ensure compliance. All input signals are specified with tR = tF = 5 ns (10% to 90% of DVDD) and timed from a voltage level of 1.6 V.
2 See Figure 3.
3 The values of t3 are measured using the load circuit of Figure 2 and are defined as the time required for the output to cross the VOL or VOH limits.
4 SCLK active edge is falling edge of SCLK.
5 The PDRST high to data valid delay is typically 1 ms longer than t6 because the internal oscillator requires time to power up and settle.
Circuit and Timing Diagrams
ISINK (1.6mA WITH DVDD = 5V,
100A WITH DVDD = 3V)
ISOURCE (200A WITH DVDD = 5V,
100A WITH DVDD = 3V)
1.6V
TO
OUTPUT
PIN
50pF
079
45
-00
2
Figure 2. Load Circuit for Timing Characterization
DOUT/RDY
(OUTPUT)
MSB
LSB
SCLK
(INPUT)
t3
t1
t4
t2
07
94
5-
0
3
Figure 3. Read Cycle Timing Diagram
PDRST
(INPUT)
t5
DOUT/RDY
(OUTPUT)
07
94
5-
0
04
Figure 4. Resetting the AD7780
GAIN OR FILTER
(INPUT)
t6
DOUT/RDY
(OUTPUT)
07945
-005
Figure 5. Changing Gain or Filter Option
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