參數(shù)資料
型號(hào)： 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(yè)數(shù)： 12/16頁(yè)
文件大?。?/td> 187K
代理商： MAX1201EMH
M
+5V S ingle-S upply, 2.2Msps, 14-Bit
S elf-Calibrating ADC
12
______________________________________________________________________________________
Table 1. Binary Output Codes
S ignal-to-Noise
Plus Distortion (S INAD)
SINAD is the ratio of the fundamental input frequency’s
RMS amplitude to all other ADC output signals.
SINAD (dB) = 20
·
log [Signal
RMS
/ (Noise +
Distortion)
RMS
]
Effec tive Number of Bits (ENOB)
ENOB indicates the global accuracy of an ADC at a
specific input frequency and sampling rate. An ideal
ADC’s error consists only of quantization noise. With an
input range equal to the full-scale range of the ADC, the
effective number of bits can be calculated as follows:
ENOB = (SINAD - 1.76) / 6.02
T otal Harmonic Distortion (T HD)
THD is the ratio of the RMS sum of the first nine har-
monics of the input signal to the fundamental itself. This
is expressed as:
(
where V
1
is the fundamental amplitude, and V
2
through
V
9
are the amplitudes of the 2nd through 9th-order har-
monics.
S purious-Free
Dynamic Range (S FDR)
SFDR is the ratio of RMS amplitude of the fundamental
(maximum signal component) to the RMS value of the
next largest spurious component, excluding DC offset.
Grounding and Power-S upply Dec oupling
Grounding and power-supply decoupling strongly influ-
ence the performance of the MAX1201. At 14-bit reso-
lution, unwanted digital crosstalk may couple through
the input, reference, power supply, and ground con-
nections; this adversely affects the signal-to-noise ratio
or spurious-free dynamic range. In addition, electro-
magnetic interference (EMI) can either couple into or
be generated by the MAX1201. Therefore, grounding
and power-supply decoupling guidelines should be
closely followed.
First, a multilayer, printed circuit board (PCB) with sep-
arate ground and power-supply planes is recommend-
ed. Run high-speed signal traces on lines directly
above the ground plane. Since the MAX1201 has sepa-
rate analog and digital ground buses (AGND and
DGND, respectively), the PCB should also have sepa-
rate analog and digital ground sections connected at
only one point (star ground). Digital signals should run
above the digital ground plane and analog signals
should run above the analog ground plane. Digital sig-
nals should be kept far away from the sensitive analog
inputs, reference input senses, common-mode input,
and clock input.
THD
20 log
V
V
2
2
V
V
V
=
)
+
+
+ +
3
2
4
2
9
2
1
SCALE
OFFSET BINARY
ONE’S COMPLEMENT
TWO’S COMPLEMENT
+FSR - 1LSB
1111 .... 1111
0111 .... 1111
0111 .... 1111
+3/4FSR
1110 .... 0000
0110 .... 0000
0110 .... 0000
+1/2FSR
1100 .... 0000
0100 .... 0000
0100 .... 0000
+1/4FSR
1010 .... 0000
0010 .... 0000
0010 .... 0000
+0
1000 .... 0000
0000 .... 0000
0000 .... 0000
-0
—— .... ——
1111 .... 1111
—— .... ——
-1/4FSR
0110 .... 0000
1101 .... 1111
1110 .... 0000
-1/2FSR
0100 .... 0000
1011 .... 1111
1100 .... 0000
-3/4FSR
0010 .... 0000
1001 .... 1111
1010 .... 0000
-FSR +1LSB
0000 .... 0001
1000 .... 0000
1000 .... 0001
-FSR
0000 .... 0000
—— .... ——
1000 .... 0000
相關(guān)PDF資料
PDF描述
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MAX1202ACAP-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
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