參數(shù)資料
型號(hào)： ADS7812U
廠商： Texas Instruments
文件頁(yè)數(shù)： 24/24頁(yè)
文件大?。?/td> 0K
描述： IC LP SERIAL 12-BIT A/D 16-SOIC
產(chǎn)品培訓(xùn)模塊： Data Converter Basics
標(biāo)準(zhǔn)包裝： 40
位數(shù)： 12
采樣率（每秒）： 40k
數(shù)據(jù)接口： 串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 35mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 16-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC
包裝： 管件
輸入數(shù)目和類(lèi)型： 3 個(gè)單端，單極；3 個(gè)單端，雙極
產(chǎn)品目錄頁(yè)面： 891 (CN2011-ZH PDF)
ADS7812
9
SBAS042A
www.ti.com
BINARY TWO’S COMPLEMENT
DIGITAL OUTPUT
TABLE III. Ideal Input Voltage and Corresponding Digital Output for Two Common Input Ranges.
DESCRIPTION
ANALOG INPUT
Full-Scale Range
±10V
0.5V to 4.5V
Least Significant Bit (LSB)
4.88mV
0.98mV
BINARY CODE
HEX CODE
+Full Scale –1LSB
9.99512V
4.49902V
0111 1111 1111
7FF
Midscale
0V
2.5V
0000 0000 0000
000
Midscale –1LSB
–4.88mV
2.49902 V
1111 1111 1111
FFF
–Full Scale
–10V
0.5V
1000 0000 0000
800
FIGURE 3. Block Diagram of the ADS7812’s Digital Inputs and Outputs.
READING DATA
The ADS7812’s digital output is in Binary Two’s Comple-
ment (BTC) format. Table III shows the relationship be-
tween the digital output word and the analog input voltage
under ideal conditions.
Figure 3 shows the relationship between the various digital
inputs, digital outputs, and internal logic of the ADS7812.
Figure 4 shows when the internal shift register of the
ADS7812 is updated and how this relates to a single conver-
sion cycle. Together, these two figures point out a very
important aspect of the ADS7812: the conversion result is
not available until after the conversion is complete. The
implications of this are discussed in the following sections.
FIGURE 4. Timing of the Shift Register Update.
Q
D
S0
Q
Update of the shift
register occurs just prior
to BUSY Rising(1)
D
S1
Q
D
S2
Q
D
S10
Q
D
S11
Q
Shift Register
Working Register
Converter Core
D
SOUT
Q
D
W0
Q
Each flip-flop in the
working register is
latched as the
conversion proceeds
D
W1
Q
D
W2
Q
D
W10
Q
D
W11
Delay
DATA
BUSY
DATACLK
CDAC
Control Logic
Clock
REF
EXT/INT
CONV
CS
NOTE: (1) If EXT/INT is HIGH (external clock), DATACLK is HIGH, and CS is LOW
during this time, the shift register will not be updated and the conversion result will be lost.
CONV
t
6 – t25
t
25
BUSY
NOTE: Update of the internal shift register occurs in the
shaded region. If EXT/INT is HIGH, then DATACLK
must be LOW or CS must be HIGH during this time.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS7812U 制造商:Texas Instruments 功能描述:A/D Converter (A-D) IC 制造商:Texas Instruments 功能描述:IC, ADC, 12BIT, 40KSPS, SOIC-16
ADS7812U/1K 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Pwr Serial 12B Sampling ADC Cnvrtr 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS7812U/1KE4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Power Serial 12-Bit 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS7812U/1KG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Pwr Serial 12B Sampling ADC Cnvrtr 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS7812UB 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Power Serial 12-Bit 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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