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参数资料
| 型号： | ISL26132AVZ-T7A |
| 厂商： | Intersil |
| 文件页数： | 11/23页 |
| 文件大小： | 0K |
| 描述： | IC ADC 24BIT SRL 80SPS 24TSSOP |
| 标准包装： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 80 |
| 数据接口： | 串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 80mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 24-TSSOP |
| 包装： | 标准包装 |
| 输入数目和类型： | 2 个差分，双极 |
| 其它名称： | ISL26132AVZ-T7ADKR |
ISL26132, ISL26134
19
FN6954.1
September 9, 2011
Applications Information
Power-up Sequence – Initialization and
Configuration
The sequence to properly power-up and initialize the device are
as follows. For details on individual functions, refer to their
descriptions.
1. AVDD, DVDD ramp to specified levels
2. Apply External Clock
3. Pull PDWN High to initiate Reset
4. Device begins conversion
5. SDO/RDY goes low at end of first conversion
OPTIONAL ACTIONS
Perform Offset Calibration
Place device in Standby
Return device from Standby
Read on-chip Temperature (applicable to ISL26132 only)
Application Examples
WEIGH SCALE SYSTEM
Figure 38 illustrates the ISL26132 connected to a load cell. The
A/D converter is configured for a gain of 128x and a sample rate
of 10Sps. If a load cell with 2mV/V sensitivity is used, the full
scale output from the load cell will be 10mV. On a gain of 128x
and sample rate of 10Sps, the converter noise is 67nVP-P. The
converter will achieve 10mV/67nVP-P = 149,250 noise free
counts across its 10mV input signal. This equates to 14,925
counts per mV of input signal. If five output words are averaged
together this can be improved by √5 to yield √5*14925
counts = 33,370 counts per mV of input signal with an effective
update rate of 2 readings per second.
THERMOCOUPLE MEASUREMENT
Figure 39 illustrates the ISL26132 in a thermocouple
application. As shown, the 4.096V reference combined with the
PGA gain set to 128x sets the input span of the converter to
±16mV. This supports the K type thermocouple measurement for
temperatures from -270°C at -6.485mV to +380°C at about
16mV.
If a higher temperature is preferred, the PGA can be set to 64x to
provide a converter span of ±32mV. The will allow the converter
to support temperature measurement with the K type
thermocouple up to about +765°C.
In the circuit shown, the thermocouple is referenced to a voltage
dictated by the resistor divider from the +5V supply to ground.
These set the common mode voltage at about 2.5V. The 5M
resistors provide a means for detection of an open thermocouple.
If the thermocouple fails open or is not connected, the bias
through the 5M resistors will cause the input to the PGA to go to
full scale.
AVDD
VREF+
CAP
AIN+1
AIN-1
AIN+2
AIN-2
VREF-
AGND
DGND
TEMP
A0
SPEED
XTALOUT
PDWN
SCLK
SDO/RDY
GAIN0
GAIN1
DVDD
ISL26132
XTALIN/CLOCK
+
-
0.1F
VDD
MICRO
CONTROLLER
GND
16
9
10
11
12
14
13
15
17
2, 5, 6
7
8
21
3
4
22
23
24
19
20
GAIN = 128
3V
5V
0.1F
18
1
FIGURE 38. WEIGH SCALE APPLICATION
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL26134 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Low-Noise 24-bit Delta Sigma ADC |
| ISL26134AV28EV1Z | 功能描述:数据转换 IC 开发工具 ISL26134 EVALRD 1 2 8LD ROHS CMPL RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| ISL26134AVZ | 功能描述:模数转换器 - ADC ISL26134AVZ LW-NOISE 24-BIT TI-COMP D/S RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| ISL26134AVZ-T | 功能描述:模数转换器 - ADC ISL26134AVZ LW-NOISE 24-BIT TI-COMP D/S RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| ISL26134AVZ-T7A | 功能描述:模数转换器 - ADC ISL26134AVZ LW-NOISE 24BIT DELTASIGMA ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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