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参数资料
| 型号： | MAX1236 |
| 厂商： | Maxim Integrated Products, Inc. |
| 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： | 2.7V至3.6V及4.5V至5.5V、低功耗、4/12通道、2线串口12位ADC |
| 文件页数： | 11/22页 |
| 文件大小： | 407K |
| 代理商： | MAX1236 |
swing from (GND - 0.3V) to (V
DD
+ 0.3V) without caus-
ing damage to the device. For accurate conversions,
the inputs must not go more than 50mV below GND or
above V
DD
.
Single-Ended/Differential Input
The SGL/
DIF
of the configuration byte configures the
MAX1236
–
MAX1239 analog-input circuitry for single-
ended or differential inputs (Table 2). In single-ended
mode (SGL/
DIF
= 1), the digital conversion results are the
difference between the analog input selected by CS[3:0]
and GND (Table 3). In differential mode (SGL/
DIF
= 0),
the digital conversion results are the difference between
the
“
+
”
and the
“
-
”
analog inputs selected by CS[3:0]
(Table 4).
Unipolar/Bipolar
When operating in differential mode, the BIP/
UNI
bit of
the set-up byte (Table 1) selects unipolar or bipolar
operation. Unipolar mode sets the differential input
range from 0 to V
REF
. A negative differential analog
input in unipolar mode causes the digital output code
to be zero. Selecting bipolar mode sets the differential
input range to ±V
REF
/2. The digital output code is bina-
ry in unipolar mode and two
’
s complement in bipolar
mode, see the
Transfer Functions
section.
In single-ended mode, the MAX1236
–
MAX1239 al-
ways operates in unipolar mode irrespective of
BIP/
UNI
. The analog inputs are internally referenced to
GND with a full-scale input range from 0 to V
REF
.
2-Wire Digital Interface
The MAX1236
–
MAX1239 feature a 2-wire interface con-
sisting of a serial data line (SDA) and serial clock line
(SCL). SDA and SCL facilitate bidirectional communica-
tion between the MAX1236
–
MAX1239 and the master at
rates up to 1.7MHz. The MAX1236
–
MAX1239 are slaves
that transfer and receive data. The master (typically a
microcontroller) initiates data transfer on the bus and
generates the SCL signal to permit that transfer.
SDA and SCL must be pulled high. This is typically done
with pullup resistors (750
or greater) (see the
Typical
Operating Circuit
). Series resistors (R
S
) are optional. They
protect the input architecture of the MAX1236
–
MAX1239
from high voltage spikes on the bus lines and minimize
crosstalk and undershoot of the bus signals.
Bit Transfer
One data bit is transferred during each SCL clock
cycle. A minimum of 18 clock cycles are required to
transfer the data in or out of the MAX1236
–
MAX1239.
The data on SDA must remain stable during the high
period of the SCL clock pulse. Changes in SDA while
SCL is stable are considered control signals (see the
START and STOP Conditions
section). Both SDA and
SCL remain high when the bus is not busy.
START and STOP Conditions
The master initiates a transmission with a START condi-
tion (S), a high-to-low transition on SDA while SCL is high.
The master terminates a transmission with a STOP condi-
tion (P), a low-to-high transition on SDA while SCL is high
(Figure 5). A repeated START condition (Sr) can be used
in place of a STOP condition to leave the bus active and
the interface mode unchanged (see HS mode).
Acknowledge Bits
Data transfers are acknowledged with an acknowledge
bit (A) or a not-acknowledge bit (
A
). Both the master
and the MAX1236
–
MAX1239 (slave) generate acknowl-
edge bits. To generate an acknowledge, the receiving
device must pull SDA low before the rising edge of the
acknowledge-related clock pulse (ninth pulse) and
keep it low during the high period of the clock pulse
(Figure 6). To generate a not-acknowledge, the receiv-
er allows SDA to be pulled high before the rising edge
of the acknowledge-related clock pulse and leaves
SDA high during the high period of the clock pulse.
Monitoring the acknowledge bits allows for detection of
unsuccessful data transfers. An unsuccessful data
transfer happens if a receiving device is busy or if a
system fault has occurred. In the event of an unsuc-
cessful data transfer, the bus master should reattempt
communication at a later time.
M
2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/12-Channel, 2-Wire Serial, 12-Bit ADCs
______________________________________________________________________________________
11
SCL
SDA
S
P
Sr
Figure 5. START and STOP Conditions
SCL
SDA
S
NOT ACKNOWLEDGE
ACKNOWLEDGE
1
2
8
9
Figure 6. Acknowledge Bits
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1237 | 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs |
| MAX1238 | 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs |
| MAX1237MEUA | 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs |
| MAX1236MEUA | 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs |
| MAX1236LEUA | 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 |
|---|---|
| MAX1236EUA | 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 |
| MAX1236EUA+ | 功能描述:模数转换器 - ADC 12-Bit 4Ch 94.4ksps 5.5V Precision 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 |
| MAX1236EUA+T | 功能描述:模数转换器 - ADC 12-Bit 4Ch 94.4ksps 5.5V Precision 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 |
| MAX1236EUA-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 |
| MAX1236EVKIT | 功能描述:数据转换 IC 开发工具 MAX1236 Eval Kit 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 |
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