參數(shù)資料
型號(hào)： AD7856AR
廠商： ANALOG DEVICES INC
元件分類： ADC
英文描述： 5 V Single Supply, 8-Channel 14-Bit 285 kSPS Sampling ADC
中文描述： 8-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO24
封裝： SOIC-24
文件頁(yè)數(shù)： 19/32頁(yè)
文件大小： 294K
代理商： AD7856AR
AD7856
–19–
REV. A
A combination of hardware and software selection can also be
used to achieve the desired effect.
Table VI.Power Management Options
PMGT1
Bit
PMGT0
Bit
SLEEP
Pin
Comment
0
0
0
Full Power-Down Between
Conversions (HW/SW)
Full Power-Up (HW/SW)
Normal Operation
(Independent of the
SLEEP
Pin)
Full Power-Down (SW)
Partial Power-Down Between
Conversions
0
0
0
1
1
X
1
1
0
1
X
X
NOTE
HW = Hardware Selection; SW = Software Selection.
POWER-UP TIMES
Using an External Reference
When the AD7856 is powered up, the part is powered up from
one of two conditions. First, when the power supplies are ini-
tially powered up and, secondly, when the part is powered up
from either a hardware or software power-down (see last section).
When AV
DD
and DV
DD
are powered up, the AD7856 should be
left idle for approximately 42 ms (6 MHz CLK) to allow for the
autocalibration if a 10 nF cap is placed on the
CAL
pin, (see
Calibration section). During power-up the functionality of the
SLEEP
pin is disabled, i.e., the part will not power down until
the end of the calibration if
SLEEP
is tied logic low. The auto-
calibration on power-up can be disabled if the
CAL
pin is tied to
a logic high. If the autocalibration is disabled, then the user must
take into account the time required by the AD7856 to power-up
before a self-calibration is carried out. This power-up time is the
time taken for the AD7856 to power up when power is first
applied (300
μ
s) typ) or the time it takes the external reference
to settle to the 14-bit level–whichever is the longer.
AUTO POWER
DOWN AFTER
CONVERSION
AUTO CAL ON
POWER-UP
AV
DD
AIN(+)
DV
DD
AIN(–)
C
REF1
C
REF2
SLEEP
DIN
DOUT
SYNC
CONVST
AGND
DGND
CLKIN
SCLK
REF
IN
/REF
OUT
AD7856
ANALOG
SUPPLY
+5V
0.1
m
F
0.1
m
F
10
m
F
0.1
m
F
0.01
m
F
MASTER CLOCK
INPUT
CONVERSION
START INPUT
SERIAL DATA OUTPUT
0.1
m
F
CAL
0.01
m
F
INTERNAL
REFERENCE
0V TO 2.5V
INPUT
4/6MHz OSCILLATOR
SERIAL CLOCK
INPUT
100kHz PULSE GENERATOR
OPTIONAL
EXTERNAL
REFERENCE
REF-192
SERIAL DATA INPUT
LOW POWER
m
C/
m
P
CURRENT, I = 12mA TYP
Figure 21. Typical Low Power Circuit
相關(guān)PDF資料
PDF描述
AD7856ARS 5 V Single Supply, 8-Channel 14-Bit 285 kSPS Sampling ADC
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD7856AR-REEL 功能描述:IC ADC 14BIT 8CH 5V 24-SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個(gè)單端，單極；1 個(gè)單端，雙極
AD7856AR-REEL7 制造商:Analog Devices 功能描述:ADC Single SAR 285ksps 14-bit Serial 24-Pin SOIC W T/R 制造商:Rochester Electronics LLC 功能描述:8 CH. 14-BIT 300 KSPS ADC I.C. - Tape and Reel
AD7856ARS 制造商:Analog Devices 功能描述:ADC Single SAR 285ksps 14-bit Serial 24-Pin SSOP
AD7856ARS-REEL 制造商:Analog Devices 功能描述:ADC Single SAR 285ksps 14-bit Serial 24-Pin SSOP T/R
AD7856ARS-REEL7 制造商:Analog Devices 功能描述:ADC Single SAR 285ksps 14-bit Serial 24-Pin SSOP T/R
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