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參數(shù)資料
| 型號： | AD7732BRU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 2-Channel, +-10 V Input Range, High Throughput, 24-Bit SIGMA- ADC |
| 中文描述： | 2-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28 |
| 封裝： | MO-153AE, TSSOP-28 |
| 文件頁數(shù)： | 29/32頁 |
| 文件大?。?/td> | 1576K |
| 代理商： | AD7732BRU |
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AD7732
Frequency Response
The sigma-delta modulator runs at the MCLK frequency,
which is effectively the sampling frequency. Therefore, the
Nyquist frequency is the MCLK frequency. The digital filter,
in association with the modulator, features the frequency
response of a first order low-pass filter. The –3 dB point is close
to the frequency of 1/channel conversion time. The roll-off is –
20 dB/dec up to the Nyquist frequency. If chopping is enabled,
the input signal is resampled by chopping. Therefore, the overall
frequency response features notches close to the frequency of
1/channel conversion time. The top envelope is again the ADC
response of –20 dB/dec.
The typical frequency response plots are given in Figure 27
and Figure 28. The plots are normalized to 1/channel
conversion time.
NORMALIZED INPUT FREQUENCY
(INPUT FREQUENCY
×
CONVERSION TIME)
G
–60
–50
–40
–30
–20
–10
0
0.1
1.0
10.0
CHOP = 1
Figure 27. Typical ADC Frequency Response, Chopping Enabled
NORMALIZED INPUT FREQUENCY
(INPUT FREQUENCY
×
CONVERSION TIME)
G
–60
–50
–40
–30
–20
–10
0
1.0
0.1
10.0
100.0
1000.0
CHOP = 0
Figure 28. Typical ADC Frequency Response, Chopping Disabled
Voltage Reference Inputs
The AD7732 has a differential reference input, REF IN(+) and
REF IN(–). The common-mode range for these inputs is from
AGND to AV
DD
. The nominal differential reference voltage for
specified operation is 2.5 V. Both reference inputs feature
dynamic load. Therefore, the reference inputs should be
connected to a low impedance reference voltage source.
External resistance/capacitance combinations may result in gain
errors on the part.
The output noise performance outlined in Table 4 through
Table 9 is for an analog input of 0 V and is unaffected by noise
on the reference. To obtain the same noise performance as
shown in the noise tables over the full input range requires a
low noise reference source for the AD7732. If the reference
noise in the bandwidth of interest is excessive, it will degrade
the performance of the AD7732.
Recommended reference voltage sources for the AD7732
include the AD780, ADR421, REF43, and REF192. Note that in a
typical connection, the voltage reference must be capable of
sinking current flowing out of the BIAS pins through the
internal resistors if a positive voltage is applied to the analog
input. The AD780 meets this requirement. If the voltage
reference used in an application is not capable of sinking
current, an external resistor (5 k) should be connected in
parallel to the REFIN pins.
Reference Detect
The AD7732 includes on-chip circuitry to detect if the part has
a valid reference for conversions. If the voltage between the
REFIN(+) and REFIN(–) pins goes below the NOREF trigger
voltage (0.5 V typ) and the AD7732 is performing a conversion,
the NOREF bit in the channel status register is set.
Rev. 0 | Page 29 of 32
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD7732BRU-REEL | 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 15.437ksps 24-bit Serial 28-Pin TSSOP T/R 制造商:Analog Devices 功能描述:ADC SGL DELTA-SIGMA 15.437KSPS 24BIT SERL 28TSSOP - Tape and Reel |
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| AD7732BRUZ | 功能描述:IC ADC 24BIT 2-CH 28-TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 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 產品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD7732BRUZ | 制造商:Analog Devices 功能描述:IC 24BIT ADC SMD 7732 TSSOP28 |
| AD7732BRUZ-REEL | 功能描述:IC ADC 24BIT 2CH SIG-DEL 28TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝: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） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
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