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參數資料

1998 Jul 02

Philips Semiconductors

Product specification

8-bit A/D and D/A converter

PCF8591

7.3

D/A conversion

The third byte sent to a PCF8591 device is stored in the

DAC data register and is converted to the corresponding

analog voltage using the on-chip D/A converter. This D/A

converter consists of a resistor divider chain connected to

the external reference voltage with 256 taps and selection

switches. The tap-decoder switches one of these taps to

the DAC output line (see Fig.5).

The analog output voltage is buffered by an auto-zeroed

unity gain amplifier. This buffer amplifier may be switched

on or off by setting the analog output enable flag of the

control register. In the active state the output voltage is

held until a further data byte is sent.

The on-chip D/A converter is also used for successive

approximation A/D conversion. In order to release the

DAC for an A/D conversion cycle the unity gain amplifier is

equipped with a track and hold circuit. This circuit holds the

output voltage while executing the A/D conversion.

The output voltage supplied to the analog output AOUT is

given by the formula shown in Fig.6. The waveforms of a

D/A conversion sequence are shown in Fig.7.

Fig.5 DAC resistor divider chain.

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PCA8591T	8-bit A/D and D/A converter
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相關代理商/技術參數	參數描述
PCF8591_03	制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit A/D and D/A converter
PCF8591P	制造商:NXP Semiconductors 功能描述:Codec General Purpose 1-CH 8Bit 3.3V/5V 16-Pin PDIP Bulk 制造商:NXP Semiconductors 功能描述:Codec General Purpose 1-CH 8Bit 3.3V/5V 16-Pin PDIP Bulk Bulk 制造商:NXP Semiconductors 功能描述:IC 8-BIT ADC/DAC 制造商:NXP Semiconductors 功能描述:IC, 8-BIT ADC/DAC 制造商:NXP Semiconductors 功能描述:IC, A/D AND D/A CONVERTER, 8BIT, 16-DIP; IC Function:A/D and D/A Converter; Brief Features:Low Standby Current, Auto Incremented Channel Selection, On Chip Track and Hold Circuit; Supply Voltage Min:2.5V; Supply Voltage Max:6V ;RoHS Compliant: Yes
PCF8591P,112	功能描述:模數轉換器 - ADC ADC/DAC 8-BIT I2C RoHS:否制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
PCF8591P112	制造商:NXP Semiconductors 功能描述:IC ADC-DAC 8BIT DIP-16
PCF8591PN	制造商:NXP Semiconductors 功能描述:Codec General Purpose 1-CH 8bit 3.3V/5V 16-Pin PDIP Bulk

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