- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383317 > MAX1272EUA (MAXIM INTEGRATED PRODUCTS INC) Fault-Protected, 12-Bit ADCs with Software-Selectable Input Range PDF資料下載
參數(shù)資料
| 型號(hào)： | MAX1272EUA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | ADC |
| 英文描述： | Fault-Protected, 12-Bit ADCs with Software-Selectable Input Range |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8 |
| 封裝： | MO-187CAA, USOP-8 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 850K |
| 代理商： | MAX1272EUA |
M
Fault-Protected, 12-Bit ADCs
with Software-Selectable Input Range
______________________________________________________________________________________
13
External Reference
To use an external reference, disable the internal buffer
by setting the REF bit in the 8-bit control word to zero
(see Table 1), and apply a reference voltage to REF. Use
an external reference voltage ranging from 2.40V to
4.18V. External reference voltages less than 4.096V
increase the ratio of RMS noise to the LSB value (full
scale / 4096) resulting in performance degradation (loss
of effective bits
—
ENOB).
The REF input impedance is a minimum of 4.8k
for
DC currents; therefore, the external reference must be
able to source 850μA during conversions and have an
output impedance of less than 10
. Bypass REF with a
1μF capacitor to GND as close to REF as possible
(Figure 7b).
Power-Down Modes
To save power, configure the ADC for a low-current
shutdown mode by setting the
PD
bit in the control
byte. The MAX1272/MAX1273 features four program-
mable power-down modes: delayed standby power-
down, immediate standby power-down, delayed full
power-down, and immediate full power-down. Select
standby or full power-down by programming MODE1 in
the input control byte (Table 4). Select delayed or
immediate power-down by programming MODE0 in the
input control byte. Use the MODE0 bit to choose when
the part enters the power-down state. For example,
when MODE0 of the control byte is 0, the device
remains powered up until after the current conversion
ends (Figure 8). On the other hand, if MODE0 = 1, the
device powers down on the falling edge of the eighth
serial clock cycle and no conversion takes place
(Figure 9). In all power-down modes, the interface
remains active with the conversion results available at
DOUT. Additionally, the input overvoltage protection
remains active in all power-down modes (MAX1272).
The first high bit on DIN after
CS
falls (start condition)
powers up the MAX1272/MAX1273 from any software-
selected power-down condition. With external refer-
ence mode, device power-up time from full power-
down is typically 10μs. Send a control byte and allow
10μs for the device to wake up from full power-down.
The next received control byte initiates a conversion.
When in internal reference mode, full power-down
mode disables the internal reference and reference
buffer. Only the interface circuitry remains active for
reading conversion results. Send a control byte and
allow 2ms (C
REF
= 1μF) for the internal reference to set-
tle and the MAX1272/MAX1273 to wake up from full
power-down mode. The next received control byte initi-
ates a conversion.
AutoShutdown
The MAX1272/MAX1273 automatically enter standby
power-down mode after each conversion without requir-
ing any startup time on the next conversion.
Digital Interface
The MAX1272/MAX1273 feature a fully compatible
SPI/QSPI and MICROWIRE serial interface. For SPI and
QSPI, clear CPOL and CPHA in the microcontroller
’
s
SPI control registers.
REF
1.0
μ
F
MAX1272
MAX1273
C
REF
Figure 7a. Internal Reference Configuration
REF
OUT
GND
IN
5V
1.0
μ
F
C
REF
MAX1272
MAX1273
MAX6064
Figure 7b. External Reference Configuration
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1273EUA | Fault-Protected, 12-Bit ADCs with Software-Selectable Input Range |
| MAX1272EPA | Fault-Protected, 12-Bit ADCs with Software-Selectable Input Range |
| MAX1273CPA | Fault-Protected, 12-Bit ADCs with Software-Selectable Input Range |
| MAX1273EPA | Fault-Protected, 12-Bit ADCs with Software-Selectable Input Range |
| MAX1272CUA | Fault-Protected, 12-Bit ADCs with Software-Selectable Input Range |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1272EUA+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC MAX1272EUA+ 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 |
| MAX1272EUA+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC FAULT-PROTECTED 12-BIT 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 |
| MAX1272EUA-T | 制造商:Maxim Integrated Products 功能描述:- Tape and Reel |
| MAX1272EVKIT | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1273BCPA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。