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AS1542 데이터시트 PDF




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부품번호 AS1542 기능
기능 12-Bit ADC
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AS1542 데이터시트, 핀배열, 회로
AS1542
16-Channel, 1 Msps, 12-Bit ADC with Sequencer
Data Sheet
1 General Description
The AS1542 is a 12-bit high-speed, low-power, 16-chan-
nel, successive-approximation ADC that operates from
a single 2.7 to 5.25V supply. The device features high
throughput rates (1Msps) and a low-noise, wide-band-
width track-and-hold amplifier that can handle input fre-
quencies in excess of 1 MHz.
The AS1542 features 16 single-ended or 8 fully differen-
tial analog inputs with a channel sequencer to allow a
programmed selection of channels to be converted
sequentially. The conversion time is determined by the
SCLK frequency (also used as the master clock to con-
trol the conversion).
The conversion process and data acquisition are con-
trolled using a chip select pin and a serial clock signal,
allowing the device to easily interface with microproces-
sors or DSPs. The input signal is sampled on the falling
edge of CSN and conversion is also initiated at this
point. There are no pipeline delays associated with the
device.
The AS1542 uses advanced design techniques to
achieve very low power dissipation at high throughput
rates. At maximum throughput rates, the AS1542 con-
sumes just 2.8mA (@3.6V), and 3.5mA (@5.25V).
By using internal control register, single-ended or fully-
differential conversion mode with different input ranges
can be used with either straight binary or twos comple-
ment output coding.
The device is available in a TSSOP-28 pin package.
Figure 1. Typical Application
2 Key Features
! Single Supply Operation with VDRIVE Function:
2.7 to 5.25V
! Fast Throughput Rate: 1 Msps
! Sequencer & Channel Counter
! Software-Configurable Analog Input Types:
- 16-Channel Single-Ended
- 8-Channel Fully-Differential
! Software-Configurable Input Range
! Low Power Consumption at Max Throughput Rates:
- 10.1mW @ 1Msps (3.6V Supply)
- 18.4mW @ 1Msps (5.25V Supply)
! Shutdown Mode Current: 0.5µA
! Flexible Power/Serial Clock Speed Management
! Wide Input Bandwidth: 71dB SNR @ 50 kHz Input
Frequency
! No Pipeline Delays
! High Speed SPI/QSPI/Microwire/DSP Interface
! TSSOP-28 Package
3 Applications
The devices are ideal for remote sensors, data-acquisi-
tion and data-logging devices, pen-digitizers, process
control, or any other space-limited A/D application with
low power-consumption requirements.
VDD
REFIN
VIN0:15
16
Multiplexer
Track/
Hold
AGND
GND
Sequencer
AS1542
12-Bit
ADC
Control
Logic
DGND
SCLK
DOUT
DIN
CSN
VDRIVE
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AS1542 pdf, 반도체, 판매, 대치품
AS1542
Data Sheet - Absolute Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in Electrical Character-
istics on page 5 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Table 2. Absolute Maximum Ratings
Parameter
Min Max Units
Comments
VDD to GND/ AGND/ DGND
VDRIVE to GND/ AGND/ DGND
-0.3 +7
-0.3
VDD +
0.3
V
V
VINx, REFIN to GND/ AGND/ DGND
-0.3
VDD +
0.3
V
CSN, SCLK, DIN,
DOUT to GND/ AGND/ DGND
-0.3
VDRIVE
+ 0.3
V
Input Current (any pin except VDD and VINx)
Power DIsspation
θJA Thermal Impedance
θJC Thermal Impedance
Electro-Static Discharge
Operating Temperature Range
Storage Temperature Range
Junction Temperature
-10
-40
-65
Package Body Temperature
+10
450
97.9
14
1
+85
+150
+150
+260
mA
mW Derate 25mW/ºC above +25ºC
ºC/W
ºC/W
kV
ºC
ºC
ºC
The reflow peak soldering temperature (body
temperature) specified is in accordance with
IPC/JEDEC J-STD-020C “Moisture/Reflow
ºC Sensitivity Classification for Non-Hermetic
Solid State Surface Mount Devices”.
The lead finish for Pb-free leaded packages is
matte tin (100% Sn).
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AS1542 전자부품, 판매, 대치품
AS1542
Data Sheet - Electrical Characteristics
Table 3. Electrical Characteristics (Continued)
Symbol
Parameter
Power Requirements
VDD Input Supply Range
VDRIVE
DRIVE Range
IDD Input Current
Condition
VDRIVE VDD
Normal Mode
(Static)
VDD = 2.7 to 5.25V,
SCLK On or Off
Normal Mode
(Operational);
fS = Max
Throughput
VDD = 4.75 to 5.25V,
fSCLK = 20 MHz
VDD = 2.7 to 3.6V,
fSCLK = 20 MHz
Auto Shutdown
Mode
fSAMPLE = 250ksps
Static
Power Dissipation
(see Power vs. Throughput
Rate on page 23).
Normal Mode
(Operational);
fSCLK = 20MHz
Auto Shutdown
Mode (Static)
VDD = 4.75 to 5.25V
VDD = 2.7 to 3.6V
VDD = 4.75 to 5.25V
VDD = 2.7 to 3.6V
Min
2.75
2.75
1. When bit RANGE = 0 and bit SE/FDN = 1, VREFIN must not be larger than VDD/2.
Typ
1.8
3.0
2.4
1.4
0.01
Max Unit
5.25 V
5.25 V
mA
3.5 mA
2.8 mA
1.6 mA
0.5 µA
18.4 mW
10.1 mW
2.5 µW
1.5 µW
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