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參數(shù)資料
| 型號： | ADS7817UB |
| 英文描述： | 50mA, 3V to 80V Low Dropout Micropower Regulator; Package: MSOP; No of Pins: 8; Temperature Range: -40°C to +125°C |
| 中文描述： | 模擬到數(shù)字轉(zhuǎn)換器，12位 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 166K |
| 代理商： | ADS7817UB |
9
ADS7816
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNITS
t
SMPL
t
CONV
t
CYC
t
CSD
Analog Input Sample TIme
1.5
2.0
Clk Cycles
Conversion Time
12
Clk Cycles
Throughput Rate
200
kHz
CS Falling to
DCLOCK LOW
0
ns
t
SUCS
CS Falling to
DCLOCK Rising
30
ns
t
hDO
DCLOCK Falling to
Current D
OUT
Not Valid
DCLOCK Falling to Next
D
OUT
Valid
CS Rising to D
OUT
Tri-State
DCLOCK Falling to D
OUT
Enabled
15
ns
t
dDO
85
150
ns
t
dis
t
en
25
50
ns
50
100
ns
t
f
t
r
D
OUT
Fall Time
D
OUT
Rise Time
70
100
ns
60
100
ns
value for one clock period. For the next 12 DCLOCK
periods, D
OUT
will output the conversion result, most sig-
nificant bit first. After the least significant bit (B0) has been
output, subsequent clocks will repeat the output data but in
a least significant bit first format.
After the most significant bit (B11) has been repeated, D
OUT
will tri-state. Subsequent clocks will have no effect on the
converter. A new conversion is initiated only when CS has
been taken HIGH and returned LOW.
The reference current diminishes directly with both conver-
sion rate and reference voltage. As the current from the
reference is drawn on each bit decision, clocking the con-
verter more quickly during a given conversion period will
not reduce the overall current drain from the reference. The
reference current changes only slightly with temperature.
See the curves, “Reference Current vs Sample Rate” and
“Reference Current vs Temperature” in the Typical Perfor-
mance Curves section for more information.
DIGITAL INTERFACE
SERIAL INTERFACE
The ADS7816 communicates with microprocessors and other
digital systems via a synchronous 3-wire serial interface as
shown in Figure 1 and Table I. The DCLOCK signal
synchronizes the data transfer with each bit being transmit-
ted on the falling edge of DCLOCK. Most receiving systems
will capture the bitstream on the rising edge of DCLOCK.
However, if the minimum hold time for D
OUT
is acceptable,
the system can use the falling edge of DCLOCK to capture
each bit.
A falling CS signal initiates the conversion and data transfer.
The first 1.5 to 2.0 clock periods of the conversion cycle are
used to sample the input signal. After the second falling
DCLOCK edge, D
OUT
is enabled and will output a LOW
FIGURE 1. ADS7816 Basic Timing Diagrams.
TABLE I. Timing Specifications –40
°
C to +85
°
C.
CS/SHDN
D
OUT
DCLOCK
t
DATA
t
SUCS
t
CSD
t
CYC
t
CONV
POWER
DOWN
t
SMPL
Note: (1) After completing the data transfer, if further clocks are applied with CS
LOW, the ADC will output LSB-First data then followed with zeroes indefinitely.
B11
(MSB)
B10 B9
B8
B7
B6
B5
B4
B3
B2
B1 B0
(1)
NULL
BIT
HI-Z
HI-Z
B11 B10
B9
B8
NULL
BIT
CS/SHDN
D
OUT
DCLOCK
t
CONV
t
DATA
t
SUCS
t
CYC
POWER DOWN
t
SMPL
Note: (2) After completing the data transfer, if further clocks are applied with CS
LOW, the ADC will output zeroes indefinitely.
t
: During this time, the bias current and the comparator power down and the reference input
becomes a high impedance node, leaving the CLK running to clock out LSB-First data or zeroes.
B11
(MSB)
B10 B9
B8
B7
B6
B5
B4
B4
B3
B3
B2
B2
B1
B1
B0
NULL
BIT
HI-Z
HI-Z
B5
B6
B7
B8
B9
B10 B11
(2)
t
CSD
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS7817UC | Analog-to-Digital Converter??? 12-Bit |
| ADS7816E | Analog-to-Digital Converter??? 12-Bit |
| ADS7816PB | Analog-to-Digital Converter??? 12-Bit |
| ADS7816PC | Analog-to-Digital Converter??? 12-Bit |
| ADS7816U | IC-SMD-12BIT UPOWER SERIAL A/D |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7817UB/2K5 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit Differential In MicroPwr Sampling RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7817UB/2K5G4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit Differential In MicroPwr Sampling RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7817UBG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit Differential In MicroPwr Sampling RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7817UC | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit Differential In MicroPwr Sampling RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7817UC/2K5 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit Differential In MicroPwr Sampling RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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