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參數(shù)資料
| 型號(hào)： | AD7298BCPZ-RL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/25頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 10BIT SPI/SRL 8CH 20LFCSP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 1M |
| 數(shù)據(jù)接口： | DSP，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 22.7mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-WFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 20-LFCSP-WQ（4x4） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 輸入數(shù)目和類型： | 8 個(gè)單端，單極 |
| 其它名稱： | AD7298BCPZ-RL7DKR |
AD7298
Rev. B | Page 15 of 24
Temperature Value Format
VDRIVE
One LSB of the ADC corresponds to 0.25°C. The temperature
reading from the ADC is stored in a 12-bit twos complement
format to accommodate both positive and negative temperature
measurements. The temperature data format is provided in
The AD7298 also provides the VDRIVE feature. VDRIVE controls the
voltage at which the serial interface operates. VDRIVE allows the
ADC to easily interface to both 1.8 V and 3 V processors. For
example, if the AD7298 is operated with a VDD of 3.3 V, the
VDRIVE pin can be powered from a 1.8 V supply.
This enables the AD7298 to operate with a larger dynamic
range with a VDD of 3.3 V while still being able to interface to
1.8 V processors. Take care to ensure VDRIVE does not exceed
section).
Table 6. Temperature Data Format
Temperature (°C)
Digital Output
40
1111 0110 0000
25
1111 1001 1100
10
1111 1101 1000
THE INTERNAL OR EXTERNAL REFERENCE
0.25
1111 1111 1111
0
0000 0000 0000
The AD7298 can operate with either the internal 2.5 V on-chip
reference or an externally applied reference. The EXT_REF bit
in the control register is used to determine whether the internal
reference is used. If the EXT_REF bit is selected in the control
register, an external reference can be supplied through the
VREF pin. On power-up, the internal reference is enabled.
Suitable external reference sources for the AD7298 include
+0.25
0000 0000 0001
+10
0000 0010 1000
+25
0000 0110 0100
+50
0000 1100 1000
+75
0001 0010 1100
+100
0001 1001 0000
+105
0001 1010 0100
+125
0001 1111 0100
The internal reference circuitry consists of a 2.5 V band gap
reference and a reference buffer. When the AD7298 operates in
internal reference mode, the 2.5 V internal reference is available
at the VREF pin, which should be decoupled to GND1 using a 10 μF
capacitor. It is recommended that the internal reference be buffered
before applying it elsewhere in the system.
The temperature conversion formulas are as follows:
Positive Temperature = ADC Code/4
Negative Temperature = (4096 ADC Code)/4
The previous formulas are for a VREF of 2.5 V only.
If an external reference is used, the temperature sensor requires
an external reference of between 2 V and 2.5 V for correct
operation. When an external reference of less than 2.5 V is
applied, the temperature results are calculated using the
following formula, where VEXT_REF is the value of the external
The internal reference is capable of sourcing up to 2 mA of
current when the converter is static. The reference buffer
requires 5.5 ms to power up and charge the 10 μF decoupling
capacitor during the power-up time.
reference voltage.
15
.
273
3
.
109
10
_
+
=
ADCCode
V
e
Temperatur
REF
EXT
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