AL1101 데이터 시트보기 (PDF) - Unspecified

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AL1101

24-Bit Analog-to-Digital Converter

Unspecified 

Architecture Details

Differential Analog Inputs

The AL1101 inputs are self-biased to MID potential. Input signals larger than maximum levels

(±4V differential, or +0.5V to +4.5V at the pin) and smaller than supply voltages are output-

limited to maximum positive and negative levels in the digital section (7FFFFFH and 800000H

respectively).

The digital section of the AL1101 compensates for the passband amplitude deviation of an

external single-pole 80kHz anti-alias filter (@ Fs=48k, scaling with Fs). To remove high-

frequency noise at the differential inputs, the capacitor between the differential inputs should be

located as close as possible to the input pins.

Single-Ended Input Conditioning Circuit

GND

Input

8Vpp

4.4k

2.2k

-

2.2k

+

GND

GND

10µ

220Ω

2.2k

-

4700p*

220Ω

+

10µ

MID

-

+

MID

4Vpp

To ADC

4Vpp

*Note: Position capacitor as close to pins as possible.

Film or high quality ceramic capacitor suggested.

If decreasing component count is an important factor, and a decrease in performance

specifications is acceptable, the AL1101 inputs may be driven unbalanced with a simple passive

component conditioning circuit. The lowpass filter has fc = 72kHz.

Unbalanced Input Conditioning Circuit

*Note: Position capacitor as close to pins as possible.

Film or high quality ceramic capacitor suggested.

The AL1101 can properly receive input logical “1” voltages of 0.55VD. This means the AL1101

can interface directly with logic signals supplied from 3.3V systems. No special interface

circuitry is required.

www.wavefrontsemi.com

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