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| 型号： | AD5933YRSZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/40页 |
| 文件大小： | 0K |
| 描述： | NETWORK ANALYZER 12B 1MSP 16SSOP |
| 产品培训模块： | AD5933 Impedance to Digital Converter 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： | 500 |
| 分辨率（位）： | 12 b |
| 主 fclk： | 16.776MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 带卷 (TR) |
| 配用： | EVAL-AD5933EBZ-ND - BOARD EVALUATION FOR AD5933 |
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AD5933
Data Sheet
Rev. E | Page 16 of 40
SYSTEM CLOCK
The system clock for the AD5933 can be provided in one of two
ways. The user can provide a highly accurate and stable system
clock at the external clock pin (MCLK). Alternatively, the AD5933
provides an internal clock with a typical frequency of 16.776 MHz
by means of an on-chip oscillator.
The user can select the preferred system clock by programming
Bit D3 in the control register (Register Address 0x81, see
Table 11). The default clock option on power-up is selected to
be the internal oscillator.
The frequency distribution of the internal clock with temperature
can be seen in Figure 14, Figure 15, and Figure 16.
TEMPERATURE SENSOR
The temperature sensor is a 13-bit digital temperature sensor with
a 14th bit that acts as a sign bit. The on-chip temperature sensor
allows an accurate measurement of the ambient device temper-
ature to be made.
The measurement range of the sensor is 40°C to +125°C. At
+150°C, the structural integrity of the device starts to deteriorate
when operated at voltage and temperature maximum specifica-
tions. The accuracy within the measurement range is ±2°C.
TEMPERATURE CONVERSION DETAILS
The conversion clock for the part is internally generated; no
external clock is required except when reading from and writing
to the serial port. In normal mode, an internal clock oscillator
runs an automatic conversion sequence.
The temperature sensor block defaults to a power-down state.
To perform a measurement, a measure temperature command
is issued by the user to the control register (Register Address 0x80
and Register Address 0x81). After the temperature operation is
complete (typically 800 μs later), the block automatically
powers down until the next temperature command is issued.
The user can poll the status register (Register Address 0x8F) to see
if a valid temperature conversion has taken place, indicating that
valid temperature data is available to read at Register Address
0x92 and Register Address 0x93 (see the Register Map section).
TEMPERATURE VALUE REGISTER
The temperature value register is a 16-bit, read-only register that
stores the temperature reading from the ADC in 14-bit, twos
complement format. The two MSB bits are don’t cares. D13 is the
sign bit. The internal temperature sensor is guaranteed to a low
value limit of –40°C and a high value limit of +150°C. The digital
output stored in Register Address 0x92 and Register Address 0x93
for the various temperatures is outlined in Table 6. The tempera-
ture sensor transfer characteristic is shown in Figure 21.
Table 6. Temperature Data Format
Temperature
Digital Output D13…D0
40°C
11, 1011, 0000, 0000
30°C
11, 1100, 0100, 0000
25°C
11, 1100, 1110, 0000
10°C
11, 1110, 1100, 0000
0.03125°C
11, 1111, 1111, 1111
0°C
00, 0000, 0000, 0000
+0.03125°C
00, 0000, 0000, 0001
+10°C
00, 0001, 0100, 0000
+25°C
00, 0011, 0010, 0000
+50°C
00, 0110, 0100, 0000
+75°C
00, 1001, 0110, 0000
+100°C
00, 1100, 1000, 0000
+125°C
00, 1111, 1010, 0000
+150°C
01, 0010, 1100, 0000
TEMPERATURE CONVERSION FORMULA
Positive Temperature = ADC Code (D)/32
Negative Temperature = (ADC Code (D) – 16384)/32
where ADC Code uses all 14 bits of the data byte, including the
sign bit.
Negative Temperature = (ADC Code (D) – 8192)/32
where ADC Code (D) is D13, the sign bit, and is removed from the
ADC code.)
D
IGI
T
A
L
O
UT
P
UT
–40°C
–0.03125°C
–30°C
11, 1111, 1111, 1111
11, 1100, 0100, 0000
11, 1011, 0000, 0000
TEMPERATURE (°C)
75°C
150°C
01, 0010, 1100, 0000
00, 1001, 0110, 0000
00, 0000, 0000, 0001
05324-
021
Figure 21. Temperature Sensor Transfer Function
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