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參數(shù)資料
| 型號： | ISL26134AVZ |
| 廠商： | Intersil |
| 文件頁數(shù)： | 11/23頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 24BIT SRL 80SPS 28TSSOP |
| 標準包裝： | 500 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 80 |
| 數(shù)據(jù)接口： | 串行 |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 80mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-TSSOP（0.173"，4.40mm 寬） |
| 供應商設(shè)備封裝： | 28-TSSOP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 4 個差分，雙極 |
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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