PCF8591P,112 NXP Semiconductors, PCF8591P,112 Datasheet - Page 7

• Manufacturer Part Number: PCF8591P,112
• Description: IC ADC/DAC 8-BIT I2C 16-DIP
• Manufacturer: NXP Semiconductors
• Type: ADC, DACr

Specifications of PCF8591P,112

• Package / Case: 16-DIP (0.300", 7.62mm)
• Resolution (bits): 8 b
• Sampling Rate (per Second): 11.1k
• Data Interface: I²C, Serial
• Voltage Supply Source: Dual ±
• Voltage - Supply: 2.5 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Resolution: 8 bit
• Interface Type: I2C
• Supply Voltage (max): 6 V
• Supply Voltage (min): 2.5 V
• Mounting Style: Through Hole
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 568-1087-5; 933768130112; PCF8591PN

Philips Semiconductors
7.3
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.6).
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
2003 Jan 27
handbook, full pagewidth
8-bit A/D and D/A converter
D/A conversion
AGND
V REF
Fig.6 DAC resistor divider chain.
R256
R255
R3
R2
R1
7
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.7. The waveforms of a
D/A conversion sequence are shown in Fig.8.
FF
02
01
00
DAC out
DECODER
TAP
MBL826
D7
D6
D0
Product specification
PCF8591