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參數(shù)資料
| 型號： | MAX1144BCAP+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 6/18頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14BIT 150KSPS 20-SSOP |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 66 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 150k |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 26.4mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SSOP（0.209"，5.30mm 寬） |
| 供應商設(shè)備封裝： | 20-SSOP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個單端，單極；1 個單端，雙極 |
MAX1144/MAX1145
magnitude of the offset produced by a synchronous
signal depends on the signal’s shape, recalibration
may be appropriate if the shape or relative timing of the
clock or other digital signals change, which can occur
if more than one clock signal or frequency is used.
Distortion
Avoid degrading dynamic performance by choosing an
amplifier with distortion much less than the
MAX1144/MAX1145’s THD (-90dB) at frequencies of
interest. If the chosen amplifier has insufficient com-
mon-mode rejection, which results in degraded THD
performance, use the inverting configuration to elimi-
nate errors from common-mode voltage. Low tempera-
ture-coefficient resistors reduce linearity errors caused
by resistance changes due to self-heating. Also, to
reduce linearity errors due to finite amplifier gain, use
an amplifier circuit with sufficient loop gain at the fre-
quencies of interest.
DC Accuracy
If DC accuracy is important, choose a buffer with an
offset much less than the MAX1144/MAX1145’s maxi-
mum offset (±6mV), or whose offset can be trimmed
while maintaining good stability over the required tem-
perature range.
Operating Modes and Serial Interfaces
The MAX1144/MAX1145 are fully compatible with
MICROWIRE and SPI/QSPI devices. MICROWIRE and
SPI/QSPI both transmit a byte and receive a byte at the
same time. The simplest software interface requires
only three 8-bit transfers to perform a conversion (one
8-bit transfer to configure the ADC, and two more 8-bit
transfers to clock out the 14-bit conversion result).
Short Acquisition Mode (24 SCLK)
Configure short acquisition by setting M1 = 0 and M0 =
0. In short acquisition mode, the acquisition time is 5
clock cycles. The total period is 24 clock cycles per
conversion.
Long Acquisition Mode (32 SCLK)
Configure long acquisition by setting M1 = 1 and M0 =
1. In long acquisition mode, the acquisition time is 13
clock cycles. The total period is 32 clock cycles per
conversion.
Calibration Mode
A calibration is initiated through the serial interface by
setting M1 = 0 and M0 = 1. Calibration can be done in
either internal or external clock mode, though it is desir-
able that the part be calibrated in the same mode in
which it will be used to do conversions. The part
remains in calibration mode for approximately 80,000
clock cycles unless the calibration is aborted. Calibr-
ation is halted if RST or SHDN goes low, or if a valid
start condition occurs.
Software Shutdown
A software power-down is initiated by setting M1 = 1
and M0 = 0. After the conversion completes, the part
shuts down. It reawakens upon receiving a new start
bit. Conversions initiated with M1 = 1 and M0 = 0 (shut-
down) use the acquisition mode selected for the previ-
ous conversion.
Shutdown Mode
The MAX1144/MAX1145 may be shut down by pulling
SHDN low or by asserting software shutdown. In addi-
tion to lowering power dissipation to 4W, considerable
power can be saved by shutting down the conv-
erter for short periods between conversions. There is
no need to perform a calibration after the converter has
been shut down unless the time in shutdown is long
enough that the supply voltage or ambient temperature
may have changed.
Supplies, Layout, Grounding,
and Bypassing
For best system performance, use separate analog and
digital ground planes. The two ground planes should
be tied together at the MAX1144/MAX1145. Use pin 3
and pin 14 as the primary AGND and DGND, respec-
tively. If the analog and digital supplies come from the
same source, isolate the digital supply from the analog
with a low-value resistor (10
).
The MAX1144/MAX1145 are not sensitive to the order
of AVDD and DVDD sequencing. Either supply can be
present in the absence of the other. Do not apply an
external reference voltage until after both AVDD and
DVDD are present.
Be sure that digital return currents do not pass through
the analog ground. All return-current paths must be low
impedance. A 5mA current flowing through a PC board
ground trace impedance of only 0.05
creates an error
voltage of about 250V, or about 0.5LSBs error with a
±4V full-scale system. The board layout should ensure
that digital and analog signal lines are kept separate.
Do not run analog and digital lines parallel to one
another. If you must cross one with the other, do so at
right angles.
The ADC is sensitive to high-frequency noise on the
AVDD power supply. Bypass this supply to the analog
ground plane with 0.1F. If the main supply is not ade-
quately bypassed, add an additional 1F or 10F low-
ESR capacitor in parallel with the primary bypass
capacitor.
14-Bit ADCs, 150ksps, 3.3V Single Supply
14
______________________________________________________________________________________
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1144BCAP+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 14-Bit 150ksps 2.2V Precision 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1144BCAP+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 14-Bit 150ksps 2.2V Precision 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1144BCAP-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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1144BEAP | 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1144BEAP+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 14-Bit 150ksps 2.2V Precision 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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