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參數資料
| 型號： | MAX11359AETL+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數： | 25/67頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAS SYSTEM 16BIT 40-TQFN |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 類型： | 數據采集系統(tǒng)（DAS） |
| 分辨率（位）： | 16 b |
| 采樣率（每秒）： | 512 |
| 數據接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 電壓電源： | 模擬和數字 |
| 電源電壓： | 1.8 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 40-WFQFN 裸露焊盤 |
| 供應商設備封裝： | 40-TQFN-EP（6x6） |
| 包裝： | 帶卷 (TR) |
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MAX11359A
16-Bit Data-Acquisition System with ADC, DAC,
UPIOs, RTC, Voltage Monitors, and Temp Sensor
31
Maxim Integrated
Two-Current Method
For the two-current method, currents I1 and I2 are
passed through a p-n junction. This requires two VBE
measurements. Temperature measurements can be
performed using I1 and I2.
where k is Boltzman’s constant and q is the absolute
value of the charge on electron. A four-measurement
procedure is adopted to improve accuracy by precisely
measuring the ratio of I1 and I2:
1) Current I1 is driven through the diode and the series
resistor R, and the voltage across the diode is mea-
sured as VBE1.
2) For the same current, the voltage across the diode
and R is measured as V1.
3) Repeat steps 1 and 2 with I2. I1 is typically 4A and
I2 is typically 60A (see Table 21).
Since only four integer numbers are accessible from the
ADC conversions at a certain voltage reference, the previ-
ous equation can be represented in the following manner:
where NV1, NV2, NVBE1, and NVBE2 are the measure-
ment results in integer format and VREF is the reference
voltage used in the ADC measurements.
Four-Current Method
The four-current method is used to account for the
diode series resistance and trace resistance. The four
currents are defined as follows; I1, I2, M1I1, and M2I2. If
the currents are selected so (M1 - 1)I1 = (M2 - 1)I2, the
effect of the series resistance is eliminated from the
temperature measurements. For the currents I1 = 4A
and I2 = 60A, the factors are selected as M1 = 16 and
M2 = 2. This results in the currents I3 = M1I1 = 64A
and I4 = M2I2 = 120A (typ). As in the case of the two-
current method, two measurements per current are
used to improve accuracy by precisely measuring the
values of the currents.
1) Current I1 is driven through the diode and the series
resistor R, and the voltage is measured across the
diode using the ADC as NVBE1.
2) For the same current, the voltage across the diode and
the series resistor is measured by the ADC as NV1.
3) Repeat steps 1 and 2 with I2, I3, and I4.
The measured temperature is defined as follows:
where VREF is the reference voltage used and:
External Temperature Sensor
For an external temperature sensor, either the two-cur-
rent or four-current method can be used. Connect an
external diode (such as 2N3904 or 2N3906) between
pins AIN1 and AGND (or AIN2 and AGND). Connect a
sense resistor R between AIN1 and AIN2. Maximize R
so the IR drop plus VBE of the p-n junction [(R x
IMAX)+VBE] is the smaller of the ADC reference voltage
or (AVDD - 400mV). The same procedure as the inter-
nal temperature sensor can be used for the external
temperature sensor, by routing the currents to AIN1 (or
AIN2) (see Table 20).
For the two-current method, if the external diode’s
series resistance (RS) is known, then the temperature
measurement can be corrected as shown below:
Temperature-Sensor Calibration
To account for various error sources during the temper-
ature measurement, the internal temperature sensor is
calibrated at the factory. The calibrated temperature
equation is:
TT
qN
N
qN
N
nkIn
NN
VR
R
ACTUAL
MEAS
V
VBE
V
VBE
V
VBE
V
VBE
REF
S
=
××
()
(
)
221
1
22
11
16
2
M
NN
V
VBE
V
VBE
V
VBE
V
VBE
1
2
33
11
22
44
=
T
qN
N
qN
N
nkIn
M
V
MEAS
VBE
REF
=
()
()
×
31
4
2
1
2
16
2
T
qN
N
nk
NN
V
MEAS
VBE
V
VBE
V
VBE
REF
()
ln
=
×
21
22
11
16
2
T
qV
V
nk
I
MEAS
BE
ln
=
()
21
2
1
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相關代理商/技術參數 |
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|---|---|
| MAX1135BCAP | 功能描述:模數轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1135BCAP+ | 功能描述:模數轉換器 - ADC 16-Bit 150ksps 3.3V Single Supply RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1135BCAP+T | 功能描述:模數轉換器 - ADC 16-Bit 150ksps 3.3V Single Supply RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1135BCAP-T | 功能描述:模數轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1135BEAP | 功能描述:模數轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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