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參數(shù)資料
| 型號(hào)： | MAX1227ACEE-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | ADC |
| 英文描述： | 12-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference |
| 中文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, MO-137, QSOP-16 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大小： | 512K |
| 代理商： | MAX1227ACEE-T |
M
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 regis-
ter, setup register, averaging register, reset register,
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 = t
cnv
x n
avg
x n
result
+ t
TS
+ t
RP
where:
t
cnv
= t
acq
(max) + t
conv
(max)
n
avg
= samples per result (amount of averaging)
n
result
= number of FIFO results requested; determined
by number of channels being scanned or by NSCAN1,
NSCAN0
t
TS
= time required for temperature measurement; set
to zero if temp measurement is not requested
t
RP
= 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:CHSEL0 to the lower channel
’
s binary values.
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
Conversion
Setup
Averaging
Reset
Unipolar mode (setup)
Bipolar mode (setup)
BIT 7
1
0
0
0
UCH0/1
BCH0/1
BIT 6
CHSEL3
1
0
0
UCH2/3
BCH1/2
BIT 5
CHSEL2
CKSEL1
1
0
UCH4/5
BCH4/5
BIT 4
CHSEL1
CKSEL0
AVGON
1
UCH6/7
BCH6/7
BIT 3
CHSEL0
REFSEL1
NAVG1
RESET
UCH8/9*
BCH8/9*
BIT 2
SCAN1
REFSEL0
NAVG0
X
UCH10/11 UCH12/138** UCH14/15**
BCH10/11
BCH12/13** BCH14/15**
BIT 1
SCAN0
DIFFSEL1
NSCAN1
X
BIT 0
TEMP
DIFFSEL0
NSCAN0
X
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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| MAX1227AEEE | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1227AEEE+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1227AEEE+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1227AEEE-T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1227BCEE | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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