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參數(shù)資料
| 型號： | MAX1201EMH |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | ADC |
| 英文描述： | Scan Test Devices With 18-Bit Bus Transceivers 56-TSSOP -40 to 85 |
| 中文描述： | 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP44 |
| 封裝： | MQFP-44 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 187K |
| 代理商： | MAX1201EMH |
M
+5V S ingle-S upply, 2.2Msps, 14-Bit
S elf-Calibrating ADC
_______________________________________________________________________________________
9
Choic e of Referenc e
It is important to choose a low-noise reference, such as
the MAX6341, which can provide both excellent load
regulation and low temperature drift. The equivalent
input circuit for the reference pins is shown in Figure 3.
Note that the reference pins drive approximately 1k
of
resistance on chip. They also drive a switched capacitor
of 21pF. To meet the dynamic performance, the refer-
ence voltage is required to settle to 0.0015% within one
clock cycle. Carefully choose an appropriate driving cir-
cuit (Figure 4). The capacitors at the reference pins
(RFPF, RFNF) provide the dynamic charge required dur-
ing each clock cycle, while the op amps ensure accura-
cy of the reference signals. These capacitors must have
low dielectric-absorption characteristics, such as poly-
styrene or teflon capacitors.
The reference pins can be connected to either single-
ended or differential voltages within the specified maxi-
mum levels. Typically, the positive reference pin (RFPF)
would be driven to 4.096V, and the negative reference
pin (RFNF) connected to analog ground. There are
sense pins, RFPS and RFNS, which can be used with
external amplifiers to compensate for any resistive drop
on these lines, internal or external to the chip. Assure a
correct reference voltage by using proper Kelvin con-
nections at the sense pins.
Common-Mode V oltage
The switched capacitor circuit at the analog input allows
signals between AGND and the analog power supply.
Since the common-mode voltage has a strong influence
on the performance of the ADC, the best results are
obtained by choosing V
CM
to be at half the difference
between the reference voltages V
RFP
and V
RFN
. Achieve
this by using a resistive divider between the two refer-
ence potentials. Figure 4 shows the driving circuit for
good dynamic performance.
RFPF
INP
INN
RFPF
CM
CM
RFNF
Figure 2. Simplified MDAC Architecture
RFPF
RFPS
RFNF
RFNS
Figure 3. Equivalent Input at the Reference Pins. The sense
pins should not draw any DC current.
V
RFP
= 4.096V
V
RFN
= 0V
5k
5k
MAX410
CHIP BOUNDARY
CM
RFNS
RFNF
RFPS
RFPF
MAX410
MAX410
Figure 4. Drive Circuit for Reference Pins and Common-Mode
Pin
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| MAX1202ACAP+T | 功能描述:模數(shù)轉換器 - ADC 12-Bit 8Ch 133ksps 5V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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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