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参数资料
| 型号： | MAX1231BEVKIT# |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/22页 |
| 文件大小： | 0K |
| 描述： | KIT EVALUATION FOR 12BIT ADCS |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 300k |
| 数据接口： | SPI? |
| 输入范围： | ±VREF/2 |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | MAX1231 |
| 已供物品： | 板 |
MAX1227/MAX1229/MAX1231
12-Bit 300ksps ADCs with FIFO,
Temp Sensor, Internal Reference
12
______________________________________________________________________________________
Applications Information
Register Descriptions
The MAX1227/MAX1229/MAX1231 communicate
between the internal registers and the external circuitry
through the SPI-/QSPI-compatible serial interface.
Table 1 details the registers and the bit names. Tables
2–7 show the various functions within the conversion
register, setup register, averaging register, reset regis-
ter, unipolar register, and bipolar register.
Conversion Time Calculations
The conversion time for each scan is based on a num-
ber of different factors: conversion time per sample,
samples per result, results per scan, if a temperature
measurement is requested, and if the external refer-
ence is in use.
Use the following formula to calculate the total conver-
sion time for an internally timed conversion in clock
modes 00 and 10 (see the
Electrical Characteristics
section as applicable):
total conversion time = tcnv x navg x nresult + tTS + tRP
where:
tcnv = tacq(max) + tconv(max)
navg = samples per result (amount of averaging)
nresult = number of FIFO results requested; determined
by number of channels being scanned or by NSCAN1,
NSCAN0
tTS = time required for temperature measurement; set
to zero if temp measurement is not requested
tRP = internal reference wake up; set to zero if internal
reference is already powered up or external reference
is being used
In clock mode 01, the total conversion time depends on
how long CNVST is held low or high, including any time
required to turn on the internal reference. Conversion
time in externally clocked mode (CKSEL1, CKSEL0 = 11)
depends on the SCLK period and how long CS is held
high between each set of eight SCLK cycles. In clock
mode 01, the total conversion time does not include the
time required to turn on the internal reference.
Conversion Register
Select active analog input channels, scan modes, and
a single temperature measurement per scan by writing
to the conversion register. Table 2 details channel
selection, the four scan modes, and how to request a
temperature measurement. Request a scan by writing
to the conversion register when in clock mode 10 or 11,
or by applying a low pulse to the CNVST pin when in
clock mode 00 or 01.
A conversion is not performed if it is requested on a
channel that has been configured as CNVST or REF-.
Do not request conversions on channels 8–15 on the
MAX1227 and channels 12–15 on the MAX1229. Set
CHSEL3:CHSELO to the lower channel’s binary value. If
the last two channels are configured as a differential
pair and one of them has been reconfigured as CNVST
or REF-, the pair is ignored.
Select scan mode 00 or 01 to return one result per sin-
gle-ended channel and one result per differential pair
within the requested range, plus one temperature result if
selected. Select scan mode 10 to scan a single input
channel numerous times, depending on NSCAN1 and
NSCAN0 in the averaging register (Table 6). Select scan
mode 11 to return only one result from a single channel.
Setup Register
Write a byte to the setup register to configure the clock,
reference, and power-down modes. Table 3 details the
REGISTER NAME
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Conversion
1
CHSEL3
CHSEL2
CHSEL1
CHSEL0
SCAN1
SCAN0
TEMP
Setup
0
1
CKSEL1
CKSEL0
REFSEL1
REFSEL0
DIFFSEL1
DIFFSEL0
Averaging
0
1
AVGON
NAVG1
NAVG0
NSCAN1
NSCAN0
Reset
0001
RESET
XX
X
Unipolar mode (setup)
UCH0/1
UCH2/3
UCH4/5
UCH6/7
UCH8/9*
UCH10/11 UCH12/138** UCH14/15**
Bipolar mode (setup)
BCH0/1
BCH1/2
BCH4/5
BCH6/7
BCH8/9*
BCH10/11
BCH12/13** BCH14/15**
Table 1. Input Data Byte (MSB First)
*Unipolar/bipolar channels 8–15 are only valid on the MAX1229 and MAX1231.
*Unipolar/bipolar channels 12–15 are only valid on the MAX1231.
X = Don’t care.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1231BEVKIT# | 功能描述:数据转换 IC 开发工具 MAX1231 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 |
| MAX1231BEVSYS# | 功能描述:数据转换 IC 开发工具 MAX1231 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 |
| MAX1231EVC16 | 功能描述:数据转换 IC 开发工具 MAX1231 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 |
| MAX1231EVKIT | 功能描述:数据转换 IC 开发工具 MAX1231 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 |
| MAX1232C/D | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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