- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄10977 > AD5934YRSZ-REEL7 (Analog Devices Inc)IC CONV 12BIT 250KSPS 16SSOP PDF資料下載
參數(shù)資料
| 型號： | AD5934YRSZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/32頁 |
| 文件大小： | 0K |
| 描述： | IC CONV 12BIT 250KSPS 16SSOP |
| 產(chǎn)品培訓(xùn)模塊： | Direct Digital Synthesis Tutorial Series (1 of 7): Introduction Direct Digital Synthesizer Tutorial Series (7 of 7): DDS in Action Direct Digital Synthesis Tutorial Series (3 of 7): Angle to Amplitude Converter Direct Digital Synthesis Tutorial Series (6 of 7): SINC Envelope Correction Direct Digital Synthesis Tutorial Series (4 of 7): Digital-to-Analog Converter Direct Digital Synthesis Tutorial Series (2 of 7): The Accumulator |
| 標(biāo)準(zhǔn)包裝： | 500 |
| 分辨率（位）： | 12 b |
| 主 fclk： | 16.776MHz |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SSOP |
| 包裝： | 帶卷 (TR) |
| 配用： | EVAL-AD5934EBZ-ND - BOARD EVALUATION FOR AD5934 |
第1頁第2頁第3頁第4頁第5頁第6頁當(dāng)前第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁
Data Sheet
AD5934
Rev. C | Page 15 of 32
IMPEDANCE CALCULATION
MAGNITUDE CALCULATION
The first step in the impedance calculation for each frequency
point is to calculate the magnitude of the DFT at that point.
The DFT magnitude is given by
2
I
R
Magnitude
+
=
where:
R is the real number stored at Register Address 0x94 and
Register Address 0x95.
I is the imaginary number stored at Register Address 0x96 and
Register Address 0x97.
For example, assume the results in the real data and imaginary
data registers are as follows at a frequency point:
Real Data Register = 0x038B = 907 decimal
Imaginary Data Register = 0x0204 = 516 decimal
1043.506
)
516
(907
2
=
+
=
Magnitude
To convert this number into impedance, it must be multiplied
by a scaling factor called the gain factor. The gain factor is
calculated during the calibration of the system with a known
impedance connected between the VOUT and VIN pins.
Once the gain factor is calculated, it can be used in the
calculation of any unknown impedance between the VOUT and
VIN pins.
GAIN FACTOR CALCULATION
An example of a gain factor calculation follows, with these
assumptions:
Output excitation voltage = 2 V p-p
Calibration impedance value, ZCALIBRATION = 200 k
PGA gain = ×1
Current-to-voltage amplifier gain resistor = 200 k
Calibration frequency = 30 kHz
The typical contents of the real data and imaginary data
registers after a frequency point conversion would then be
Real Data Register = 0xF064 = 3996 decimal
Imaginary Data Register = 0x227E = +8830 decimal
(
)
106
.
9692
)
8830
(
3996
2
=
+
=
Magnitude
Impedance
1
Code
Admittance
Factor
Gain
=
=
12
10
819
.
515
106
.
9692
kΩ
200
1
×
=
=
Factor
Gain
IMPEDANCE CALCULATION USING GAIN FACTOR
The next example illustrates how the calculated gain factor
derived previously is used to measure an unknown impedance.
For this example, assume that the unknown impedance is 510 k.
After measuring the unknown impedance at a frequency of
30 kHz, assume that the real data and imaginary data registers
contain the following data:
Real Data Register = 0xFA3F = 1473 decimal
Imaginary Data Register = 0x0DB3 = +3507 decimal
3802.863
)
(3507)
1473)
((
2
=
+
=
Magnitude
The measured impedance at the frequency point is then given by
Magnitude
Factor
Gain
Impedance
×
=
1
Ω
3802.863
10
515.819273
1
12 ×
×
=
= 509.791 k
GAIN FACTOR VARIATION WITH FREQUENCY
Because the AD5934 has a finite frequency response, the gain
factor also shows a variation with frequency. This variation in
gain factor results in an error in the impedance calculation over
a frequency range. Figure 18 shows an impedance profile based
on a single-point gain factor calculation. To minimize this error,
the frequency sweep should be limited to as small a frequency
range as possible.
101.5
98.5
54
66
05325-
085
FREQUENCY (kHz)
IM
PE
DANCE
(k
)
101.0
100.5
100.0
99.5
99.0
56
58
60
62
64
VDD = 3.3V
CALIBRATION FREQUENCY = 60kHz
TA = 25°C
MEASURED CALIBRATION IMPEDANCE = 100k
Figure 18. Impedance Profile Using a Single-Point Gain Factor Calculation
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VE-B1D-IX-B1 | CONVERTER MOD DC/DC 85V 75W |
| AD9833BRMZ-REEL7 | IC WAVEFORM GEN PROG 10MSOP |
| VE-B1D-IW-B1 | CONVERTER MOD DC/DC 85V 100W |
| MCF51AC256BCFUE | MCU 32BIT 256K FLASH 64-QFP |
| AD9833BRMZ-REEL | IC WAVEFORM GEN PROG 10MSOP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD594 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Monolithic Thermocouple Amplifiers with Cold Junction Compensation |
| AD594A | 制造商:AD 制造商全稱:Analog Devices 功能描述:Monolithic Thermocouple Amplifiers with Cold Junction Compensation |
| AD594AD | 制造商:Analog Devices 功能描述:Temp Sensor Analog 14-Pin TO-116 制造商:Rochester Electronics LLC 功能描述:THERMOCOUPLER AMPLIFIER - Bulk 制造商:Analog Devices 功能描述:Special Function IC Package/Case:TO-116 |
| AD594AD/+ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD594ADZ | 功能描述:IC THERMOCOUPLE INSTR AMP 14CDIP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 功能:溫度開關(guān) 傳感器類型:內(nèi)部 感應(yīng)溫度:85°C 分界點 精確度:±6°C（最小值） 拓撲:ADC（三角積分型），比較器，寄存器庫 輸出類型:開路漏極 輸出警報:是 輸出風(fēng)扇:是 電源電壓:2.7 V ~ 5.5 V 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:ADT6501SRJZP085RL7-ND |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。