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| 型号： | EVAL-ADUC7122QSPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 28/96页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADUC7122 |
| 设计资源： | EVAL-ADUC7122 Schematic ADUC7122 Gerber Files ADUC7122 BOM |
| 标准包装： | 1 |
| 系列： | MicroConverter® ADuC7xxx |
| 类型： | MCU |
| 适用于相关产品： | ADUC7122 |
| 所含物品： | 板 |
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ADuC7122
Rev. 0 | Page 34 of 96
AVDD
C1
D
R1 C2
AVDD
C1
D
R1 C2
08
75
5-
02
2
Figure 22. Equivalent Analog Input Circuit Conversion Phase:
Switches Open, Track Phase: Switches Closed
For ac applications, removing high frequency components from
the analog input signal is recommended through the use of an
RC low-pass filter on the relevant analog input pins. 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 significantly affect the ac performance
of the ADC and can necessitate the use of an input buffer amplifier.
The choice of the op amp is a function of the particular application.
Figure 23 and Figure 24 give an example of an ADC front end.
0
875
5-
0
23
ADuC7122
ADC0
10
0.01F
Figure 23. Buffering Single-Ended/Pseudo Differential Input
08
75
5-
0
24
ADuC7122
ADC0
VREF
ADC1
Figure 24. Buffering Differential Inputs
When no amplifier is used to drive the analog input, the source
impedance should be limited to values lower than 1 kΩ. 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 the
performance degrades.
DRIVING THE ANALOG INPUTS
Internal or external reference can be used for the ADC. In
differential mode of operation, there are restrictions on the
common-mode input signal (VCM) that are dependent on
reference value and supply voltage used to ensure that the signal
remains within the supply rails.
maximum values under various AVDD and VREF conditions.
Table 35. VCM Ranges
AVDD
VREF
VCM Min
VCM Max
Peak-to-Peak Signal
3.3 V
2.5 V
1.25 V
2.05 V
2.5 V
2.048 V
1.024 V
2.276 V
2.048 V
1.25 V
0.75 V
2.55 V
1.25 V
3.0 V
2.5 V
1.25 V
1.75 V
2.5 V
2.048 V
1.024 V
1.976 V
2.048 V
1.25 V
0.75 V
2.25 V
1.25 V
BAND GAP REFERENCE
The ADuC7122 provides an on-chip band gap reference of
2.5 V that can be used for the ADC and for the DAC. This
2.5 V reference is generated from a 1.2 V reference.
This internal reference also appears on the VREF_1.2 and
VREF_2.5 pins. When using the internal reference, a 470 nF
capacitor must be connected between VREF_1.2 and AGND and
a 470 nF capacitor between VREF_2.5 pin and AGND to ensure
stability and fast response during ADC conversions.
The band gap reference also connects through buffers to the
BUF_VREF1 and the BUF_VREF2 pins, which can be used as a
reference for other circuits in the system. A minimum of 0.1 μF
capacitor should be connected to these pins to damp noise.
The band gap reference interface consists of an 8-bit REFCON
MMR, described in Table 36. It is recommended to enable
REFCON Bit 0 and Bit 1 when performing an ADC or DAC
conversion that uses the internal reference.
An external reference can be used for an ADC conversion.
To perform an ADC conversion with an external 2.5 V refer-
ence, clear REFCON[1] and apply the external reference to
the VREF_2.5 pin. To apply an external 1.2 V reference, clear
REFCON[0] and apply the external reference to the VREF_1.2 pin.
Note that when applying an external reference to the VREF_1.2
pin, this internally influences the 2.5 V reference as the 2.5 V
reference is generated from the 1.2 V reference.
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