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參數資料
| 型號： | AD7992 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 2-Channel, 12-Bit ADC with I2C Compatible Interface in 10-Lead MSOP |
| 中文描述： | 2通道，12位I2C兼容接口的ADC的10引腳MSOP |
| 文件頁數： | 11/21頁 |
| 文件大小： | 266K |
| 代理商： | AD7992 |
AD7992
–11–
REV. PrH
PRELIMINARY TECHNICAL DATA
Analog Input
Figure 6 shows an equivalent circuit of the analog input
sturcture of the AD7992. The two diodes D1 and D2
provide ESD protection for the analog inputs. Care must
be taken to ensure that the analog input signal never ex-
ceeds the supply rails by more than 300mV. This will
cause these diodes to become forward biased and start
conducting current into the substrate. 10 mA is the maxi-
mum current these diodes can conduct without causing
irreversable damage to the part. The capacitor C1 in Fig-
ure 6 is typically about 4pF and can primarily be attrib-
uted to pin capacitance. The resistor R1 is a lumped
component made up of the on resistance (R
ON
) of a switch
(track and hold switch) and also includes the R
ON
of the
input multiplexer. This resistor is typically about 100
.
The capacitor C2 is the ADC sampling capacitor and has
a capacitance of 30 pF typically.
For ac applications, removing high frequency compo-
nents from the analog input signal is recommended by use
of an RC band-pass filter on the relevant analog input pin.
In applications where harmonic distortion and signal to
noise ratio are critical the analog input should be driven
from a low impedance source. Large source impedances
will significantly affect the ac performance of the ADC.
This may necessitate the use of an input buffer amplifier.
The choice of the op amp will be a function of the par-
ticular application.
When no amplifier is used to drive the analog input the
source impedance should be limited to low values. The
maximum source impedance will depend on the amount of
total harmonic distortion (THD) that can be tolerated.
The THD will increase as the source impedance increases
and performance will degrade. Figure 7 shows a graph of
the Total Harmonic Distortion vs. analog input signal
frequency for different source impedances when using a
supply voltage of 3V±10% and 5V ±10% and sampling at
a rate of xkSPS. Figure 8 shows a graph of the total har-
monic distortion versus analog input signal frequency for
various supply voltages while sampling at xkSPS .
Figure 6. Equivalent Analog Input Circuit
Figure 7. THD vs. Analog Input Frequency for
Various Source Impedance for V
DD
= 3V and 5V
Figure 8. THD vs. Analog Input Frequency,
Fs = xkSPS
Figure 5 AD7992 Typical Connection Diagram
V
DD
VINx
GND
+5V SUPPLY
REF 19X
0.1μF
10μF
AD7992
0V to REFIN
INPUT
SDA
μC/μP
SCL
TWO WIRE SERIAL
INTERFACE
0.1μF
ALERT
REF IN
R
P
R
P
R
P
SET TO REQUIRED
ADDRESS
AS
VIN
D1
VDD
D2
R1
C2
30PF
C1
4PF
CONVERSION PHASE - SWITCH OPEN
TRACK PHASE - SWITCH CLOSED
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| AD7992BRM-0 | 2-Channel, 12-Bit ADC with I2C Compatible Interface in 10-Lead MSOP |
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| AD7994BRU-0 | 4-Channel, 12-/10-Bit ADCs with I2C Compatible Interface in 16-Lead TSSOP |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7992_05 | 制造商:AD 制造商全稱:Analog Devices 功能描述:2-Channel, 12-Bit ADC with I2C-Compatible |
| AD7992BRM-0 | 制造商:Analog Devices 功能描述:ADC Single SAR 188ksps 12-bit Serial 10-Pin MSOP |
| AD7992BRM-0REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 188ksps 12-bit Serial 10-Pin MSOP T/R |
| AD7992BRM-1 | 制造商:Analog Devices 功能描述:ADC Single SAR 188ksps 12-bit Serial 10-Pin MSOP 制造商:Rochester Electronics LLC 功能描述:2-CHANNEL, 12-BIT ADC WITH 12C ITF I.C. - Bulk |
| AD7992BRM-1REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 188ksps 12-bit Serial 10-Pin MSOP T/R |
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