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參數(shù)資料
| 型號： | MX7824TQ |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | ADC |
| 英文描述： | CMOS, High-Speed, 8-Bit ADCs with Multiplexer |
| 中文描述： | 4-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, CDIP24 |
| 封裝： | CERDIP-24 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 106K |
| 代理商： | MX7824TQ |
Input Current
The converters’ analog inputs behave somewhat differ-
ently from conventional ADCs. The sampled data com-
parators take varying amounts of current from the input,
depending on the cycle they are in. The equivalent cir-
cuit of the converter is shown in Figure 9a. When the
conversion starts, AIN(n) is connected to the MS and
LS comparators. Thus, AIN(n) is connected to thirty-one
1pF capacitors.
To acquire the input signal in approximately 1μs, the
input capacitors must charge to the input voltage
through the on-resistance of the multiplexer (about
600
) and the comparator’s analog switches (2k
to
5k
per comparator). In addition, about 12pF of stray
capacitance must be charged. The input can be mod-
eled as an equivalent RC network shown in Figure 9b.
As R
S
(source impedance) increases, the capacitors
take longer to charge.
Since the length of the input acquisition time is internal-
ly set, large source resistances (greater than 100
) will
cause settling errors. The output impedance of an op-
amp is its open-loop output impedance divided by the
loop gain at the frequency of interest. It is important
that the amplifier driving the converter input have suffi-
cient loop gain at approximately 1MHz to maintain low
output impedance.
Input Filtering
The transients in the analog input caused by the sam-
pled data comparators do not degrade the converter’s
performance, since the ADC does not “l(fā)ook” at the
input when these transients occur. The comparator’s
outputs track the input during the first 1μs of the con-
version, and are then latched. Therefore, at least 1μs
will be provided to charge the ADC’s input capaci-
tance. It is not necessary to filter these transients with
an external capacitor on the AIN terminals.
S inusoidal Inputs
The MAX154/MAX158 and MX7824/MX7828 can mea-
sure input signals with slew rates as high as 157mV/μs
to the rated specifications. This means that the analog
input frequency can be as high as 10kHz without the
aid of an external track/hold. The maximum sampling
rate is limited by the conversion time (typical t
CRD
=
2μs) plus the time required between conversions (t
p
=
500ns). It is calculated as:
f
MAX
=
1 =
t
CRD
+ t
p
(2.0 + 0.5) μs
1 = 400kHz
M
CMOS , High-S peed, 8-Bit ADCs
with Multiplexer
_______________________________________________________________________________________
9
MAX154
MAX158
V
IN
GND
V
DD
REF OUT
V
REF
+
AIN
x
(+)
AIN
x
(-)
+5V
0.1
μ
F
47
μ
F
0.01
μ
F
V
REF
-
MX7824
MX7828
MX584
V
IN
GND
V
DD
V
REF
+
AIN
x
(+)
AIN
x
(-)
+5V
2.5V
0.1
μ
F
47
μ
F
V
REF
-
MAX154
MAX158
MX7824
MX7828
V
IN
GND
V
DD
V
REF
+
AIN
x
(+)
AIN
x
(-)
+5V
0.1
μ
F
47
μ
F
V
REF
-
MAX154
MAX158
MX7824
MX7828
V
IN
GND
* Current path must
still exist from
V
IN(-)
to Ground
V
DD
V
REF
+
AIN
x
(+)
AIN
x
(-)
+5V
2.5V
0.1
μ
F
47
μ
F
V
REF
-
*
Figure 8a. Internal Reference (MAX154/MAX158 only)
Figure 8b. External Reference +2.5V Full-Scale
Figure 8c. Power Supply as Reference
Figure 8d. Inputs Not Referenced to GND
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MX7824UQ | CMOS, High-Speed, 8-Bit ADCs with Multiplexer |
| MX7828KN | CMOS, High-Speed, 8-Bit ADCs with Multiplexer |
| MX7828KP | CMOS, High-Speed, 8-Bit ADCs with Multiplexer |
| MX7828TQ | CMOS, High-Speed, 8-Bit ADCs with Multiplexer |
| MX7824 | CMOS, High-Speed, 8-Bit ADCs with Multiplexer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MX7824TQ/883 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-Ended Data Acquisition System |
| MX7824TQ/883B | 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 |
| MX7824UQ | 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 |
| MX7824UQ/883 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-Ended Data Acquisition System |
| MX7824UQ/883B | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 4Ch 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 |
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