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参数资料
| 型号： | MAX1239LEEE |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | ADC |
| 英文描述： | 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs |
| 中文描述： | 12-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16 |
| 封装： | 0.150 INCH, 0.025 INCH PITCH, QSOP-16 |
| 文件页数： | 17/22页 |
| 文件大小： | 407K |
| 代理商： | MAX1239LEEE |
clock. In external clock mode, the MAX1236
–
MAX1239
begin tracking the analog input on the ninth rising clock
edge of a valid slave address byte. Two SCL clock
cycles later, the analog signal is acquired and the con-
version begins. Unlike internal clock mode, converted
data is available immediately after the first four empty
high bits. The device continuously converts input chan-
nels dictated by the scan mode until given a not
acknowledge. There is no need to readdress the
device with a read command to obtain new conversion
results (see Figure 11).
The conversion must complete in 1ms, or droop on the
track-and-hold capacitor degrades conversion results.
Use internal clock mode if the SCL clock period
exceeds 60μs.
The MAX1236
–
MAX1239 must operate in external clock
mode for conversion rates from 40ksps to 94.4ksps.
Below 40ksps, internal clock mode is recommended
due to much smaller power consumption.
Scan Mode
SCAN0 and SCAN1 of the configuration byte set the
scan mode configuration. Table 5 shows the scanning
configurations. If AIN_/REF is set to be a reference
input or output (SEL1 = 1, Table 6), AIN_/REF is exclud-
ed from a multichannel scan. The scanned results are
written to memory in the same order as the conversion.
Read the results from memory in the order they were
converted. Each result needs a 2-byte transmission; the
first byte begins with four empty bits, during which SDA
is left high. Each byte has to be acknowledged by the
master or the memory transmission is terminated. It is
not possible to read the memory independently of con-
version.
Applications Information
Power-On Reset
The configuration and setup registers (Tables 1 and 2)
default to a single-ended, unipolar, single-channel con-
version on AIN0 using the internal clock with V
DD
as the
reference and AIN_/REF configured as an analog input.
The memory contents are unknown after power-up.
Automatic Shutdown
SEL[2:0] of the setup byte (Table 1 and Table 6) control
the state of the reference and AIN_/REF. If automatic
shutdown is selected (SEL[2:0] = 100), shutdown
occurs between conversions when the MAX1236
–
MAX1239 are idle. When operating in external clock
mode, a STOP, not-acknowledge, or repeated START
condition must be issued to place the devices in idle
mode and benefit from automatic shutdown. A STOP
condition is not necessary in internal clock mode to
benefit from automatic shutdown because power-down
occurs once all contents are written to memory (Figure
10). All analog circuitry is inactive in shutdown and
supply current is less than 0.5μA. The digital conversion
results are maintained in memory during shutdown and
are available for access through the serial interface at
any time prior to a STOP or a repeated START condition.
When idle, the MAX1236
–
MAX1239 continuously wait
for a START condition followed by their slave address
(see the
Slave Address
section). Upon reading a valid
address byte, the MAX1236
–
MAX1239 power up. The
internal reference requires 10ms to wake up, so when
using the internal reference it should be powered up
10ms prior to conversion or powered continuously.
Wake-up is invisible when using an external reference
or V
DD
as the reference.
M
2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/12-Channel, 2-Wire Serial, 12-Bit ADCs
______________________________________________________________________________________
17
SCAN1
SCAN0
SCANNING CONFIGURATION
0
0
Scans up from AIN0 to the input selected by CS3
–
CS0. When CS3
–
CS0 exceeds 11, the scanning stops
at AIN11. When AIN_/REF is set to be a REF in/out, scanning stops at AIN10 or AIN3.
*Converts the input selected by CS3
–
CS0 eight times (see Tables 3 and 4).
Scans up from AIN2 to the input selected by CS1 and CS0. When CS1 and CS0 are set for AIN0
–
AIN2,
the scanning stops at AIN2 (MAX1236/MAX1237). When AIN/REF is set to be a REF IN/OUT, scanning
stops at AIN3 or AIN10.
Scans up from AIN6 to the input selected by CS3
–
CS0. When CS3
–
CS0 is set for AIN0-AIN6, scanning
stops at AIN6 (MAX1238/MAX1239). When AIN/REF is set to be a REF IN/OUT, scanning stops at AIN or
AIN10.
*Converts channel selected by CS3
–
CS0.
0
1
1
0
1
1
*
When operating in external clock mode, there is no difference between SCAN[1:0] = 01 and SCAN[1:0] = 11 and converting occurs
perpetually until not-acknowledge occurs.
Table 5. Scanning Configuration
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1239MEEE | Circular Connector; No. of Contacts:128; Series:D38999; Body Material:Metal; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle; Insert Arrangement:25-35 |
| MAX1238LEEE | DIODE ZENER DUAL COMMON-CATHODE 300mW 10Vz 5mA-Izt 0.06 0.1uA-Ir 7.5 SOT-23 3K/REEL |
| MAX1237KEUA | 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs |
| MAX1238MEEE | 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs |
| MAX1236KEUA | 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1239LEEE+ | 功能描述:模数转换器 - ADC Integrated Circuits (ICs) 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 |
| MAX1239LEEE+T | 功能描述:模数转换器 - 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 |
| MAX1239LEEE-T | 功能描述:模数转换器 - 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 |
| MAX1239MEEE | 功能描述:模数转换器 - 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 |
| MAX1239MEEE+ | 功能描述:模数转换器 - ADC Integrated Circuits (ICs) 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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