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| 型号： | EVAL-AD5933EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/40页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD5933 |
| 产品培训模块： | AD5933 Impedance to Digital Converter ADP2102 DSP Battery Life Applications 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 |
| 标准包装： | 1 |
| 主要目的： | 计时，直接数字合成（DDS） |
| 嵌入式： | 否 |
| 已用 IC / 零件： | AD5933 |
| 主要属性： | 12 位数模转换器，24 位调节字宽 |
| 次要属性： | 16MHz 2.7 V ~ 5.5 V 图形用户界面 |
| 已供物品： | 板，缆线，CD |
| 产品目录页面： | 797 (CN2011-ZH PDF) |
| 相关产品： | AD5933YRSZ-REEL7-ND - NETWORK ANALYZER 12B 1MSP 16SSOP AD5933YRSZ-ND - IC NTWK ANALYZER 12B 1MSP 16SSOP |
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Data Sheet
AD5933
Rev. E | Page 13 of 40
SYSTEM DESCRIPTION
ADC
(12 BITS)
VDD/2
DDS
CORE
(27 BITS)
DAC
Z(ω)
I2C
INTERFACE
IMAGINARY
REGISTER
REAL
REGISTER
MAC CORE
(1024 DFT)
LPF
SCL
SDA
MCLK
ROUT
VOUT
AD5933
RFB
VIN
PROGRAMMABLE
GAIN AMPLIFIER
×5
×1
WINDOWING
OF DATA
COS
SIN
MICROCONTROLLER
MCLK
05324-
017
TEMPERATURE
SENSOR
OSCILLATOR
Figure 17. Block Overview
The AD5933 is a high precision impedance converter system
solution that combines an on-board frequency generator with a
12-bit, 1 MSPS ADC. The frequency generator allows an external
complex impedance to be excited with a known frequency. The
response signal from the impedance is sampled by the on-board
ADC and DFT processed by an on-board DSP engine. The DFT
algorithm returns both a real (R) and imaginary (I) data-word at
each frequency point along the sweep. The impedance magnitude
and phase are easily calculated using the following equations:
2
I
R
Magnitude
+
=
Phase = tan1(I/R)
To characterize an impedance profile Z(ω), generally a frequency
sweep is required, like that shown in Figure 18.
FREQUENCY
IM
P
E
DANCE
05324-
018
Figure 18. Impedance vs. Frequency Profile
The AD5933 permits the user to perform a frequency sweep with
a user-defined start frequency, frequency resolution, and number
of points in the sweep. In addition, the device allows the user to
program the peak-to-peak value of the output sinusoidal signal as
an excitation to the external unknown impedance connected
between the VOUT and VIN pins.
Table 5 gives the four possible output peak-to-peak voltages and
the corresponding dc bias levels for each range for 3.3 V. These
values are ratiometric with VDD. So for a 5 V supply
p
V
3
.
3
0
.
5
98
.
1
=
×
=
1
Range
for
Voltage
Excitation
Output
p
V
24
.
2
3
.
3
0
.
5
48
.
1
=
×
=
1
Range
for
Voltage
Bias
DC
Output
Table 5. Voltage Levels Respective Bias Levels for 3.3 V
Range
Output Excitation
Voltage Amplitude
Output DC Bias Level
1
1.98 V p-p
1.48 V
2
0.97 V p-p
0.76 V
3
383 mV p-p
0.31 V
4
198 mV p-p
0.173 V
The excitation signal for the transmit stage is provided on-chip
using DDS techniques that permit subhertz resolution. The receive
stage receives the input signal current from the unknown impedance,
performs signal processing, and digitizes the result. The clock for
the DDS is generated from either an external reference clock,
which is provided by the user at MCLK, or by the internal
oscillator. The clock for the DDS is determined by the status of
Bit D3 in the control register (see Register Address 0x81 in the
Register Map section).
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