AS1542-BTSU ams, AS1542-BTSU Datasheet - Page 25

• Manufacturer Part Number: AS1542-BTSU
• Description: Analog to Digital Converters - ADC
• Manufacturer: ams

Specifications of AS1542-BTSU

• Rohs: yes
• Number Of Channels: 16/8
• Architecture: SAR
• Conversion Rate: 1 MSPs
• Resolution: 12 bit
• Input Type: Single-Ended/Differential
• Snr: 71 dB
• Interface Type: QSPI, SPI
• Operating Supply Voltage: 2.7 V to 5.25 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-28
• Maximum Power Dissipation: 18.4 mW
• Minimum Operating Temperature: - 40 C
• Number Of Converters: 1

AS1542
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
Figure 35
nected to the analog ground plane of the system. In
source, to provide an analog input range of 0 to 2.5V (if
5V (if bit RANGE is 0 and bit SE/FDN = 1). In
interface is connected to a 3V microprocessor.
Pin V
result is output in a 16-bit word. This 16-bit data stream consists of four address bits indicating which channel the con-
version result corresponds to, followed by the 12 bits of conversion data.
Note: For applications where power consumption is of concern, the power-down modes should be used between
Figure 35. Typical Application
Note: For the circuit shown in
Initialisation
When power is first applied to the AS1542 interal power-on reset circuitry sets the device for
PM0 = X) on page
Note: The device requires 10µs after the power supplies stabilize; no conversions should be initiated during this time.
The digital output at pin DOUT will be set to tri-state after internal power-on reset.
www.austriamicrosystems.com
DRIVE
conversions or bursts of several conversions to improve power performance
mance decouple all analog input channels and the reference input voltage to the ground of AGND.
shows a typical connection diagram for the AS1542. In this configuration, pin AGND, GND and DGND con-
5V
is connected to the same 3V supply of the microprocessor to allow a 3V logic interface. The conversion
0.1µF
23.
VREFIN
0V to
2.5V
10µF
4.7µF
Figure
V
REFIN
AGND
IN0:15
GND
V
35, unused input channels should be connected to ground. For optimum perfor-
DD
Figure 35
AS1542
Figure
Revision 1.00
RANGE (page 14)
the AS1542 is connected to a V
35, REFIN is connected to a decoupled 2.5V reference
SCLK
DOUT
DIN
CSN
VDRIVE
DGND
0.1µF
is 1 and bit
10µF
(see Power Modes on page
SE/FDN (page 14)
DD
of 5V, however the serial
DSP/µP
Auto Shutdown (PM1 = 0,
3V
= 1) or 0 to
25 - 29
22).