AS1529 데이터 시트보기 (PDF) - austriamicrosystems AG

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AS1529

Micro-Power, 10-Bit, 150ksps, ADC, Single Ended or Differential

austriamicrosystems AG 

AS1528/AS1529

Data Sheet - Detailed Description

Input Bandwidth

The AS1528/AS1529 input tracking circuitry has a 20MHz small signal bandwidth, so it is possible to digitize high-

speed transient events and measure periodic signals with bandwidths exceeding the AS1528/AS1529 sampling rate

by using undersampling techniques.

Note: To avoid high-frequency signals being aliased into the frequency band of interest, anti-alias filtering is recom-

mended.

Analog Input Protection

Internal protection diodes that clamp the analog input to VDD and GND allow the analog input pins to swing from GND

- 0.3V to VDD + 0.3V without damage. Both inputs must not exceed VDD by more than 50mV or be lower than GND by

more than 50mV for accurate conversions.

Note: If an off-channel analog input voltage exceeds the supply voltages, the input current should be limited to 2mA.

Internal Clock

The AS1528/AS1529 operate from an internal clock, which is accurate within 5% of the 4MHz clock rate. This results in

a worst-case conversion time of 3.7µs. The internal clock releases the system microprocessor from running the SAR

conversion clock and allows the conversion results to be read back at the processor’s convenience, at any clock rate

from 0 to 8MHz.

Output Data Format

Figure 18 on page 11 and Figure 19 on page 11 illustrate the conversion timing for the AS1528/AS1529. The 10-bit

conversion result is output in MSB-first format. Data on DOUT transitions on the falling edge of SCLK. All 10 bits must

be clocked out before CNVST transitions again.

For the AS1528, data is straight binary for unipolar mode and two’s complement for bipolar mode. For the AS1529,

data is always straight binary.

Transfer Function

Figure 20 on page 12 shows the unipolar transfer function for the AS1528/AS1529. Figure 21 on page 13 shows the

bipolar transfer function for the AS1528. Code transitions occur halfway between successive-integer LSB values.

Figure 20. AS1528/AS1529 Unipolar Transfer Function

Full Scale = VREF

Zero Scale = GND

1 LSB = VREF/4096

11...111

11...110

11....101

Full-Scale

Transition

00...011

00...010

00...001

00...000

01 2 3

FS-3/2 LSB FS

Input Voltage (LSB)

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