參數(shù)資料
型號: AK5354VT
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: 圓形連接器
英文描述: Circular Connector; No. of Contacts:55; Series:MS27484; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:16; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:16-35 RoHS Compliant: No
中文描述: 低功耗20位ADC,美國PGA
文件頁數(shù): 17/19頁
文件大?。?/td> 109K
代理商: AK5354VT
ASAHI KASEI
[AK5354]
MS0054-E-01
2001/01
- 17 -
1. Grounding and Power Supply Decoupling
The AK5354 requires careful attention to power supply and grounding arrangements. VA is usually supplied from analog
supply in system. VD is a power supply pin to interface with the external ICs and is supplied from digital supply in system.
VSS of the AK5354 should be connected to analog ground plane. System analog ground and digital ground should be
connected together near to where the supplies are brought onto the printed circuit board. Decoupling capacitors should be
as near to the AK5354 as possible, with the small value ceramic capacitor being the nearest.
2. Voltage Reference
The input to VA Voltage sets the analog input range. A 0.1
μ
F ceramic capacitor and a 10
μ
F electrolytic capacitor is
connected to VA and VSS pins, normally. VCOM is a signal ground of this chip. An electrolytic 2.2
μ
F in parallel with a
0.1
μ
F ceramic capacitor attached to these pins eliminates the effects of high frequency noise. No load current may be
drawn from VCOM pin. All signals, especially clock, should be kept away from the VA, VD and VCOM pins in order to
avoid unwanted coupling into the AK5354.
3. Analog Inputs
The analog inputs are single-ended and the input resistance 9k
(typ). The input signal range scales with nominally 0.6 x
VA Vpp (typ) centered in the internal common voltage (typ. 0.45 x VA). Usually, the input signal cuts DC with a capacitor.
The cut-off frequency is fc=(1/2
π
RC). The AK5354 can accept input voltages from VSS to VA. The ADC output data
format is 2’s complement. The DC offset including ADC own DC offset removed by the internal HPF
(fc=3.4Hz@fs=44.1kHz).
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