AVDD = 2.7 V to 5.25 V, DV
參數(shù)資料
型號(hào): AD7781CRZ
廠商: Analog Devices Inc
文件頁(yè)數(shù): 12/16頁(yè)
文件大?。?/td> 0K
描述: IC ADC 20BIT 1CH LP SD 14SOIC
產(chǎn)品培訓(xùn)模塊: Weigh Scale Introduction
設(shè)計(jì)資源: Weigh Scale Design Using AD7781 with Internal PGA (CN0108)
標(biāo)準(zhǔn)包裝: 56
位數(shù): 20
采樣率(每秒): 16.7
數(shù)據(jù)接口: 串行,SPI?
轉(zhuǎn)換器數(shù)目: 1
電壓電源: 單電源
工作溫度: -40°C ~ 105°C
安裝類型: 表面貼裝
封裝/外殼: 14-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 14-SO
包裝: 管件
輸入數(shù)目和類型: 1 個(gè)差分,雙極
產(chǎn)品目錄頁(yè)面: 779 (CN2011-ZH PDF)
AD7781
Rev. 0 | 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
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
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.
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
PDRST
(INPUT)
t5
DOUT/RDY
(OUTPUT)
08
16
2
-00
4
GAIN OR FILTER
(INPUT)
081
62
-00
2
Figure 2. Load Circuit for Timing Characterization
DOUT/RDY
(OUTPUT)
MSB
LSB
SCLK
(INPUT)
t3
t1
t4
t2
08
16
2-
0
3
Figure 3. Read Cycle Timing Diagram
Figure 4. Resetting the AD7781
t6
DOUT/RDY
(OUTPUT)
08
16
2
-00
5
Figure 5. Changing Gain or Filter Option
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