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| 型號： | AD7452BRT-R2 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/29頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT 555KSPS SOT23-8 |
| 標準包裝： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 555k |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉換器數(shù)目： | 1 |
| 功率耗散（最大）： | 7.25mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-8 |
| 供應商設備封裝： | SOT-23-8 |
| 包裝： | 剪切帶 (CT) |
| 輸入數(shù)目和類型： | 2 個單端，單極；1 個差分，單極 |
| 其它名稱： | AD7452BRT-R2CT |
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AD7452
Rev. B | Page 15 of 28
different values of VREF for VDD = 5 V. It also gives the maximum
and minimum common-mode voltages for each reference value
according to Figure 23.
COMMON-MODE (CM)
CMMIN = 1V
CMMAX = 4V
2V p-p
VIN–
VIN+
REFERENCE = 2V
COMMON-MODE (CM)
CMMIN = 1.25V
CMMAX = 3.75V
2.5V p-p
VIN–
VIN+
REFERENCE = 2.5V
03154-A
-025
Figure 25. Examples of the Analog Inputs to VIN+ and VIN– for
Different Values of VREF for VDD = 5 V
Analog Input Structure
Figure 26 shows the equivalent circuit of the analog input
structure of the AD7452. The four diodes provide ESD
protection for the analog inputs. Care must be taken to ensure
that the analog input signals never exceed the supply rails by
more than 300 mV. This causes these diodes to become
forward-biased and start conducting into the substrate. These
diodes can conduct up to 10 mA without causing irreversible
damage to the part. The capacitors, C1 in Figure 26, are typically
4 pF and can primarily be attributed to pin capacitance. The
resistors are lumped components made up of the on resistance
of the switches. The value of these resistors is typically about
100 . The capacitors C2 are the ADC’s sampling capacitors
and have a typical capacitance of 16 pF.
C1
C2
R1
D
C1
C2
R1
D
VDD
03154-A
-026
VIN+
VIN–
Figure 26. Equivalent Analog Input Circuit
Conversion Phase—Switches Open; Track Phase—Switches Closed
For ac applications, removing high frequency components from
the analog input signal through the use of an RC low-pass filter
on the relevant analog input pins is recommended. In applica-
tions where harmonic distortion and signal-to-noise ratio are
critical, the analog input should be driven from a low imped-
ance source. Large source impedances significantly affect the ac
performance of the ADC. This may necessitate the use of an
input buffer amplifier. The choice of the op amp is a function of
the particular application.
When no amplifier is used to drive the analog input, the source
impedance should be limited to low values. The maximum
source impedance depends on the amount of total harmonic
distortion (THD) that can be tolerated. The THD increases as
the source impedance increases, and performance degrades.
Figure 27 shows a graph of the THD versus the analog input
signal frequency for different source impedances for VDD = 5 V.
INPUT FREQUENCY (kHz)
10
100
THD
(dB)
–40
–60
–100
277
–20
0
TA = 25°C
VDD = 5V
RIN = 510
RIN = 1k
RIN = 10
RIN = 300
–80
03154-A
-027
Figure 27. THD vs. Analog Input Frequency for Various
Source Impedances for VDD = 5 V
Figure 28 shows a graph of the THD versus the analog input
frequency for VDD of 5 V ± 5% and 3 V +20%/–10%, while
sampling at 555 kSPS with an SCLK of 10 MHz. In this case, the
source impedance is 10 .
10
100
THD
(dB)
–60
–65
–90
277
–55
–50
TA = 25°C
VDD = 4.75V
–70
VDD = 5.25V
VDD = 3.6V
VDD = 2.7V
–75
–80
–85
INPUT FREQUENCY (kHz)
03154-A
-028
Figure 28. THD vs. Analog Input Frequency for 3 V and 5 V Supply Voltages
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