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參數(shù)資料
| 型號(hào)： | ADC7802BN |
| 英文描述： | Autocalibrating, 4-Channel, 12-Bit ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | Autocalibrating，4通道，12位模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 10/13頁(yè) |
| 文件大?。?/td> | 102K |
| 代理商： | ADC7802BN |
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10
ADC7802
INSTALLATION
INPUT BANDWIDTH
From the typical performance curves, it is clear that ADC7802
can accurately digitize signals up to 500Hz, but distortion
will increase beyond this point. Input signals slewing faster
than 8mV/
μ
s can degrade accuracy. This is a result of the
high-precision auto-zeroing circuit used during the acquisi-
tion phase. For applications requiring higher signal band-
width, any good external sample/hold, like the SHC5320,
can be used.
INPUT IMPEDANCE
ADC7802 has a very high input impedance (input bias
current over temperature is 100nA max), and a low 50pF
input capacitance. To ensure a conversion accurate to 12 bits,
the analog source must be able to charge the 50pF and settle
within the first five clock cycles after a conversion is initi-
ated. During this time, the input is also very sensitive to noise
at the analog input, since it could be injected into the
capacitor array.
FIGURE 7. Measuring Active LOW to/from Hi-Z State.
Test
Point
ADC7802
Output
5V
3k
C
L
(a) Load Circuit
t
FALL
90%
50%
10%
10%
Gnd
V
D
V
D
V
OL
t
15
t
14
t
13
90%
50%
10%
0.8V
t
RISE
(b) From LOW to Hi-Z, C = 10pF
(c) From Hi-Z to LOW, C = 50pF
Output
Enable
Gnd
V
D
V
D
V
OL
Output
Enable
FIGURE 8. Measuring Active HIGH to/from Hi-Z State.
Test
Point
ADC7802
Output
3k
C
L
(a) Load Circuit
t
FALL
90%
50%
10%
90%
Gnd
V
D
V
OH
t
15
t
14
t
13
90%
50%
10%
2.4V
t
RISE
(c) From Hi-Z to HIGH, C = 50pF
(b) From HIGH to Hi-Z, C = 10pF
Output
Enable
Gnd
Gnd
V
D
V
OH
Gnd
Output
Enable
In many applications, a simple passive low-pass filter as
shown in Figure 9a can be used to improve signal quality. In
this case, the source impedance needs to be less than 5k
to
keep the induced offset errors below 1/2LSB, and to meet the
acquisition time of five clock cycles. The values in Figure 9a
meet these requirements, and will maintain the full power
bandwidth of the system. For higher source impedances, a
buffer like the one in Figure 9b should be used.
FIGURE 9. Input Signal Conditioning.
OPA27
To ADC7802
Analog
Input
(b) Active Low Pass Filter
(a) Passive Low Pass Filter
Analog
Input
100
To ADC7802
22nF
R
C
V
REF
– (Normally 0V)
V
REF
– (Normally 0V)
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| ADC7802BP | 制造商:BB 制造商全稱:BB 功能描述:Autocalibrating, 4-Channel, 12-Bit ANALOG-TO-DIGITAL CONVERTER |
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| ADC78H89CIMT | 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 |
| ADC78H89CIMT | 制造商:Texas Instruments 功能描述:IC 12BIT ADC 500KSPS POWERWISE |
| ADC78H89CIMT/NOPB | 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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