AS1541BQFT austriamicrosystems, AS1541BQFT Datasheet - Page 10

• Manufacturer Part Number: AS1541BQFT
• Description: IC, ADC, 10BIT, 50KSPS, TQFN-16
• Manufacturer: austriamicrosystems

Specifications of AS1541BQFT

• Resolution (bits): 10bit
• Sampling Rate: 50kSPS
• Input Channel Type: Single Ended
• Data Interface: 2-Wire, I2C, Serial
• Supply Voltage Range - Analog: 2.7V To 5.25V
• Supply Current: 850µA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AS1539/AS1541
Data Sheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1539/AS1541 successive approximation register (SAR) A/D converter architecture is based on capacitive
redistribution which inherently includes a sample-and- hold function.
The AS1539/AS1541 core is controlled by an internally generated free-running clock. When the device is not perform-
ing conversions or being addressed, the A/D converter-core and internal clock are powered off.
Figure 22. Simplified I/O Diagram
Analog Input
When the converter enters the hold mode, the voltage on the selected CHx pin is captured on the internal capacitor
array. The input current on the analog inputs depends on the conversion rate of the device. During the sample period,
the source must charge the internal sampling capacitor (typically 15pF). After the capacitor has been fully charged,
there is no further input current. The amount of charge transfer from the analog source to the converter is a function of
conversion rate.
Figure 23. Reference circuit
www.austriamicrosystems.com
1µF
REF
VIN
IN/OUT
COM
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
+
-
AS1539/
AS1541
10Ω
1µF
1nF
V
SDA
SCL
A0
A1
GND
DD
REF
CH0:CH7
+
IN/OUT
Revision 1.03
0.1 to
10µF
AS1539
2kΩ
V
SDA
DD
+
0.1 to
10µF
Microcontroller
+5.25V
+2.7 to
2kΩ
+5.25V
+2.7 to
0.1 to
10µF
+
10 - 20