AS1524 반도체 회로 부품 판매점
1-Channel Pseudo/True-Differential and 2-Channel Single-Ended ADCs
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 austriamicrosystems AG |
Datasheet
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AS1524/AS1525
150ksps, 12-Bit, 1-Channel Pseudo/True-Differential
and 2-Channel Single-Ended ADCs
1 General Description
2 Key Features
The AS1524/AS1525 are low-power, 12-bit analog-to-
digital converters (ADCs) designed to operate with a sin-
gle +2.7V to +5.25V supply. Excellent dynamic perfor-
mance, low power consumption, and simplicity make
these devices perfect for portable battery-powered data-
acquisition applications.
The devices are available as the standard products
listed in Table 1.
Table 1. Standard Products
Model
Input Type
Input Voltage
AS1524
1-Channel, Pseudo /
True-Differential
0 to VREF /
-VREF/2 to VREF/2
AS1525
2-Channel, Single-
Ended
0 to VREF
! Single-Supply Operation: +2.7V to +5.25V
! Automatic Shutdown Between Conversions
! Low Power Consumption
- 350µA @ 150ksps
- 245µA @ 100ksps
- 24µA @ 10ksps
- 2.5µA @ 1ksps
- 200nA in Automatic Shutdown Mode
! True-Differential Track/Hold, 150kHz Sampling Rate
Software-Configurable Unipolar/Bipolar Conversion
(AS1524)
The devices feature a successive-approximation regis-
ter (SAR), automatic shutdown, fast wakeup (1.4µs),
and low-power consumption at the maximum sampling
rate of 150ksps.
Automatic shutdown (0.2µA) between conversions
results in reduced power consumption (at slower
throughput rates).
Data access are made via an external clock through the
SPI-/QSPI-/MICROWIRE-compatible 3-wire high-speed
serial interface.
The AS1525/AS1524 are available in a 8-pin TDFN
(3x3mm) package.
Figure 1. AS1524/AS1525 - Block Diagram
! Input Common Mode Range from GND to VDD
! 3-Wire SPI-/QSPI-/MICROWIRE-Compatible Serial
Interface
! Internal Conversion Clock
! 8-pin TDFN (3x3mm) Package
3 Applications
The devices are ideal for remote sensors, data-acquisi-
tion, data logging devices, lab instruments, or for any
other space-limited A/D devices with low power con-
sumption and single-supply requirements.
1
VDD
7
CNVST
8
SCLK
2
AIN1/AIN+
2
AIN2/AIN-
4
REF
AS1524/AS1525
Input
Shift
Register
Osc
Control
Logic
Track/
Hold
12-Bit
SAR
6
DOUT
5
GND
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AS1524/AS1525
Datasheet
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Contents
1 General Description ............................................................................................................................. 1
2 Key Features ........................................................................................................................................ 1
3 Applications .......................................................................................................................................... 1
4 Pinout ................................................................................................................................................... 3
Pin Assignment ................................................................................................................................................... 3
Pin Description ..................................................................................................................................................... 3
5 Absolute Maximum Ratings ................................................................................................................. 4
6 Electrical Characteristics ...................................................................................................................... 5
Timing Characteristics ......................................................................................................................................... 7
7 Typical Operating Characteristics ........................................................................................................ 8
8 Detailed Description ........................................................................................................................... 11
True Differential Analog Input Track/Hold .......................................................................................................... 11
Selecting AIN1 or AIN2 (AS1525) ...................................................................................................................... 11
Selecting Unipolar or Bipolar Conversions (AS1524) .........................................................................................12
Input Bandwidth ..................................................................................................................................................13
Analog Input Protection ......................................................................................................................................13
Internal Clock ......................................................................................................................................................13
Output Data Format ............................................................................................................................................13
Transfer Function ................................................................................................................................................13
9 Application Information ....................................................................................................................... 15
Automatic Shutdown Mode .................................................................................................................................15
External Reference .............................................................................................................................................15
Performing a Conversion ....................................................................................................................................15
Standard Interface Connections ..........................................................................................................................15
SPI and Microwire Interface ........................................................................................................................... 15
QSPI Interface ................................................................................................................................................16
PIC16 and SSP Module and PIC17 Interface ................................................................................................17
Layout and Grounding Considerations .............................................................................................................. 19
10 Package Drawings and Markings .................................................................................................... 20
11 Ordering Information ........................................................................................................................ 21
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AS1524 data
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