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參數(shù)資料
| 型號： | ADS7810U |
| 英文描述： | CMOS Quad 2-Input NOR Gate 14-CDIP -55 to 125 |
| 中文描述： | 12位800kHz采樣CMOS模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 208K |
| 代理商： | ADS7810U |
ADS7810
8
To reduce the number of control pins, CS can be tied LOW
using R/C to control the read and convert modes. Note that
the parallel output will be active whenever R/C is HIGH and
no conversion is in progress. See the Reading Data section
and refer to Table I for control line functions for ‘read’ and
‘convert’ modes.
READING DATA
The ADS7810 outputs full parallel data in Binary Two’s
Complement data format. The parallel output will be active
when R/C (pin 23) is HIGH, CS (pin 24) is LOW, and no
conversion is in progress. Any other combination will tri-
state the parallel output. Valid conversion data can be read
in a full parallel, 12-bit word on D11-D0 (pins 6-13 and 15-
18). Refer to Table II for ideal output codes.
After the conversion is completed and the output registers
have been updated, BUSY (pin 25) will go HIGH. Valid data
from the most recent conversion will be available on
D11-D0 (pins 6-13 and 15-18). BUSY going HIGH can be
used to latch the data. Refer to Table III and Figures 2
and 3.
Note: For the best performance, the external data bus con-
nected to D11-D0 should not be active during a conversion.
The switching noise of the external asynchronous data
signals can cause digital feedthrough degrading the
converter’s performance.
The number of control lines can be reduced by tieing CS
LOW while using R/C to initiate conversions and activate
the output mode of the converter. See Figure 2.
INPUT RANGES
The ADS7810 offers a standard
±
10V input range. Figures
4a and 4b show the necessary circuit connections for the
ADS7810 with and without external trim. Offset and full
scale error
(1)
specifications are tested and guaranteed with
the 50
resistor shown in Figure 4b. This external resistor
makes it possible to trim the offset
±
50mV using a trim pot
or trim DAC. This resistor may be left out if the offset and
gain errors will be corrected in software or if they are
negligible in regards to the particular application. See the
Calibration
section of the data sheet for details.
The nominal input impedance of 3.125k
results from the
combination of the internal resistor network shown on the
front page of the product data sheet and external 50
resistor. The input resistor divider network provides inherent
overvoltage protection guaranteed to at least
±
25V. The
50
, 1% resistor does not compromise the accuracy or drift
of the converter. It has little influence relative to the internal
resistors, and tighter tolerances are not required.
Note: The values shown for the internal resistors are for
reference only. The exact values can vary by
±
30%. This is
true of all resistors internal to the ADS7810. Each resistive
divider is trimmed so that the proper division is achieved.
NOTE: (1) Full scale error includes offset and gain errors measured at both
+FS and –FS.
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNITS
t
1
Convert Pulse Width
40
ns
t
2
Data Valid Delay
After R/C LOW
955
1095
ns
t
3
BUSY Delay
From R/C LOW
70
125
ns
t
4
BUSY LOW
950
1080
ns
t
5
BUSY Delay After
End of Conversion
90
ns
t
6
t
7
Aperture Delay
20
ns
Conversion Time
910
1020
ns
t
8
Acquisition Time
200
230
ns
t
7
& t
8
Throughput Time
1110
1250
ns
t
9
Bus Relinquish Time
10
50
83
ns
t
10
BUSY Delay
After Data Valid
20
65
120
ns
t
11
R/C to CS
Setup Time
10
ns
t
12
Time Between
Conversions
1250
ns
t
13
Bus Access Time
10
25
62
ns
TABLE III. Timing Specifications (T
MIN
to T
MAX
).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7810U/1K | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 800kHz Sampling CMOS 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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7810U/1KE4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 800kHz Sampling CMOS 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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7810U/1KG4 | 功能描述:IC 12BIT 800KHZ SMPL ADC 28SOIC 制造商:texas instruments 系列:- 包裝:帶卷（TR） 零件狀態(tài):停產(chǎn) 位數(shù):12 采樣率（每秒）:800k 輸入數(shù):1 輸入類型:單端 數(shù)據(jù)接口:并聯(lián) 配置:S/H-ADC 無線電 - S/H:ADC:1:1 A/D 轉(zhuǎn)換器數(shù):1 架構(gòu):SAR 參考類型:外部， 內(nèi)部 電壓 - 電源，模擬:±5V 電壓 - 電源，數(shù)字:5V 特性:- 工作溫度:-40°C ~ 70°C 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商器件封裝:28-SOIC 基本零件編號:ADS7810 標(biāo)準(zhǔn)包裝:1,000 |
| ADS7810U-1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADS7810UB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 800kHz Sampling CMOS 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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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