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參數(shù)資料
| 型號： | AD7322 |
| 廠商： | Atmel Corp. |
| 英文描述： | Software Selectable True Bipolar Input, 2-Channel, 12-Bit Plus Sign ADC |
| 中文描述： | 軟件可選真雙極性輸入，2通道，12位ADC的加號 |
| 文件頁數(shù)： | 18/18頁 |
| 文件大?。?/td> | 901K |
| 代理商： | AD7322 |
Preliminary Technical Data
AD7322
the selected channel with a 50 kHz signal. The figure given is
the worst-case across all eight channels for the AD7322.
Intermodulation Distortion
With inputs consisting of sine waves at two frequencies, fa and
fb, any active device with non-linearities will create distortion
products at sum and difference frequencies of mfa ± nfb where
m, n = 0, 1, 2, 3, etc. Intermodulation distortion terms are those
for which neither m nor n are equal to zero. For example, the
second order terms include (fa + fb) and (fa – fb), while the
third order terms include (2fa + fb), (2fa – fb), (fa + 2fb) and (fa
– 2fb).
The AD7322 is tested using the CCIF standard where two input
frequencies near the top end of the input bandwidth are used.
In this case, the second order terms are usually distanced in
frequency from the original sine waves while the third order
terms are usually at a frequency close to the input frequencies.
As a result, the second and third order terms are specified
separately. The calculation of the intermodulation distortion is
as per the THD specification where it is the ratio of the rms
sum of the individual distortion products to the rms amplitude
of the sum of the fundamentals expressed in dBs.
PSR (Power Supply Rejection)
Variations in power supply will affect the full-scale transition
but not the converter’s linearity. Power supply rejection is the
maximum change in full-scale transition point due to a change
in power supply voltage from the nominal value. See Typical
Performance Curves.
Theory of Operation
CIRCUIT INFORMATION
The AD7322 is a fast, 2-Channel, 12-bit plus Sign, Bipolar Input,
Serial A/D converter. The AD7322 can accept bipolar input
ranges that include ±10V, ±5V, ±2.5V, it can also accept 0 to 10V
unipolar input range. Different Analog input ranges can be
programmed on each analog input Channel via the on-chip
range register. The AD7322 has a high speed serial interface that
can operate at throughput rates up to 1 MSPS.
The AD7322 requires VDD and VSS dual supplies for the high
voltage Analog input structure. These supplies must be equal to
or greater than the Analog input range. See
for the
minimum requirements on these supplies for each Analog Input
Range. The AD7322 requires a low voltage 2.7V to 5.25 V VCC
supply to power the ADC core.
Table 5. Reference and Supply Requirements for each Analog
Input Range
Ain Range
VDD/VSS
Min
VCC
Reference V
± 12 V
3 V to 5V
3V
± 10 V
± 10V
3 V to 5 V
2.5 V
± 5 V
3V to 5V
2.5 V
± 2.5 V
± 5 V
3 V to 5 V
2.5 V
0 to 10 V
± 10 V
3 V to 5 V
2.5 V
The Analog Inputs can be configured as either 2 Single-Ended
inputs, 1 True Differential Inputs, or 1 Pseudo Differential
Input. Selection can be made by programming the Mode bits,
Mode0 and Mode1, in the on-chip Control Register.
The serial clock input accesses data from the part but also
provides the clock source for each successive approximation
ADC. The AD7322 has an on-chip 2.5 V reference. If an
External Reference is the preferred option the user must write
to the reference bit in the control register to disable the internal
Reference.
The AD7322 also features power-down options to allow power
saving between conversions. The power-down modes are
selected by programming the power management bits in the on-
chip Control Register, as described in the Modes of Operation
section.
CONVERTER OPERATION
The AD7322 is a successive approximation analog-to-digital
converter, based around two capacitive DACs. F
and
show simplified schematics of the ADCs in Single
Ended Mode during the acquisition and conversion phase,
respectively.
show simplified schematics
of the ADC in Differential Mode during acquisition and
conversion phase, respectively. The ADC is comprised of
control logic, a SAR, and a capacitive DAC. In F
(the
acquisition phase), SW2 is closed and SW1 is in position A, the
comparator is held in a balanced condition, and the sampling
capacitor array acquires the signal on the input.
Figure 4. ADC Acquisition Phase(Single Ended)
Vin0
AGND
CONTROL
LOGIC
CAPACITIVE
DAC
SW2
SW1
CS
A
B
COMPARATOR
Rev. PrE | Page 9 of 18
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相關代理商/技術(shù)參數(shù) |
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| AD7322BRU | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Software Selectable True Bipolar Input, 2-Channel, 12-Bit Plus Sign ADC |
| AD7322BRUZ | 功能描述:IC ADC 12BIT+ SAR 2CHAN 14TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD7322BRUZ-REEL | 功能描述:IC ADC 12BIT+SAR 2CHAN 14-TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個單端，單極 |
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| AD7322LYRU | 制造商:Analog Devices 功能描述: |
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