參數(shù)資料
型號(hào)： MAX1281
廠商： Maxim Integrated Products, Inc.
英文描述： 400ksps/300ksps, Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference
中文描述： 400ksps/300ksps、單電源、低功耗、8通道、串行12位ADC，內(nèi)置電壓基準(zhǔn)
文件頁(yè)數(shù)： 19/24頁(yè)
文件大?。?/td> 363K
代理商： MAX1281
M
400ksps/300ksps, Single-Supply, Low-Power, 8-Channel,
Serial 12-Bit ADCs with Internal Reference
______________________________________________________________________________________
19
18k
. During conversion, an external reference at REF
must deliver up to 350μA DC load current and have 10
or less output impedance. If the reference has a higher
output impedance or is noisy, bypass it close to the REF
pin with a 4.7μF capacitor.
Using the REFADJ input makes buffering the external
reference unnecessary. To use the direct REF input,
disable the internal buffer by connecting REFADJ to
V
DD1
.
Transfer Function
Table 5 shows the full-scale voltage ranges for unipolar
and bipolar modes. Figure 14 depicts the nominal,
unipolar input/output (I/O) transfer function, and Figure
15 shows the bipolar I/O transfer function. Code transi-
tions occur halfway between successive-integer LSB
values. Output coding is binary, with 1LSB = 610μV
for unipolar and bipolar operation.
Layout, Grounding, and Bypassing
For best performance, use printed circuit boards; wire-
wrap boards are not recommended. Board layout
should ensure that digital and analog signal lines are
separated from each other. Do not run analog and digi-
tal (especially clock) lines parallel to one another, or
digital lines underneath the ADC package.
Figure 16 shows the recommended system ground
connections. Establish a single-point analog ground
(star ground point) at GND. Connect all analog grounds
to the star ground. Connect the digital system ground
to star ground at this point only. For lowest-noise opera-
tion, the ground return to the star ground’s power sup-
ply should be low impedance and as short as possible.
High-frequency noise in the V
DD1
power supply may
affect the high-speed comparator in the ADC. Bypass
the supply to the star ground with 0.1μF and 10μF
capacitors, located close to pin 20 of the MAX1280/
MAX1281. Minimize capacitor lead lengths for best
supply-noise rejection. If the power supply is very
noisy, a 10
resistor can be connected as a lowpass
filter (Figure 16).
+3.3V
510k
24k
100k
0.01μF
12
REFADJ
MAX1281
Figure 13. MAX1281 Reference-Adjust Circuit
OUTPUT CODE
FULL-SCALE
TRANSITION
11
. . .
111
11
. . .
110
11
. . .
101
00
. . .
011
00
. . .
010
00
. . .
001
00
. . .
000
1
2
3
0
(COM)
FS
FS - 3/2LSB
FS = V
REF
+ V
COM
ZS = V
COM
1LSB = V
REF
INPUT VOLTAGE (LSB)
4096
Figure 14. Unipolar Transfer Function, Full Scale (FS) = V
REF
+ V
COM
, Zero Scale (ZS) = V
COM
011
. . .
111
011
. . .
110
000
. . .
010
000
. . .
001
000
. . .
000
111
. . .
111
111
. . .
110
111
. . .
101
100
. . .
001
100
. . .
000
- FS
COM*
INPUT VOLTAGE (LSB)
OUTPUT CODE
ZS = COM
+FS - 1LSB
*V
COM
V
REF
/ 2
+ V
COM
FS
= V
REF
2
-FS =
+ V
COM
-V
REF
2
1LSB = V
REF
4096
Figure 15. Bipolar Transfer Function, Full Scale (FS) =
V
REF
/ 2 + V
COM
, Zero Scale (ZS) = V
COM
相關(guān)PDF資料
PDF描述
MAX1280BEUP 400ksps/300ksps, Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference
MAX1281BCUP 400ksps/300ksps, Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference
MAX1281BEUP 400ksps/300ksps, Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference
MAX1283BCUE 300ksps/400ksps, Single-Supply, 4-Channel, Serial 12-Bit ADCs with Internal Reference
MAX1282 300ksps/400ksps, Single-Supply, 4-Channel, Serial 12-Bit ADCs with Internal Reference
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1281BCUP 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
MAX1281BCUP+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 300ksps 3.6V 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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX1281BCUP+T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 300ksps 3.6V 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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX1281BCUP-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
MAX1281BEUP 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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