[AK9240]
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Preliminary
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AK9240
AFE with Dual 12-Bit 1MSPS SAR ADC
General Description
The AK9240 is an Analog Front End with 12-bit 1MSPS A/D converter. It integrates a programmable
gain amplifier (PGA) that is able to select the input current and the input voltage realizing to control the
input range. An LED driver and auto power control circuits are also integrated, making the device
suitable for compact optical encoders. The AK9240 is housed in a space-saving 20-pin QFN package.
Features
Simultaneous Sampling 12-bit SAR A/D Converter
Sampling Rate: 1MSPS
Differential Inputs
Current Input or Voltage Input Selectable
PGA Function
LED driver
Automatic Power Control Circuit
Low Pass Filter
S/(N+D): 71dB (Typ.) at 10kHz Input.
INL: ±1.25LSB (Max.)
DNL: ±1.0LSB (Max.)
Power Consumption: 17 mA (Typ.) at Voltage Input Mode, fs= 1MSPS
Power Supply: 2.7 ~ 5.5V
Operational Temperature Range (Ta): -40 ~ 105ºC
Small Package: 20-pin QFN (3mm x 3mm)
LVDD LEDLPF
LEDREF
VREFP
VREFN
LEDO
LED
Driver
Auto Power
Controller
2.5V
Reference
RSTN
Current
Input
AIN0P
Voltage
Input
Current
Input
AIN0N
Voltage
Input
Current
Input
AIN1P
Voltage
Input
Current
Input
AIN1N
Voltage
Input
VDD
VSS
DRVDD
SAR
PGA1
ADC1
Serial I/F
&
Control
Logic
SAR
CSN
PGA0
SCLK
ADC0
SDO0
SDO1
SDATI
SDATO
Figure 1. AK9240 Block Diagram
Rev. 0.7
-1-
2015/7
[AK9240]
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More detail product information is available,
please contact our sales office or authorized distributors.
IMPORTANT NOTICE
0. Asahi Kasei Microdevices Corporation (“AKM”) reserves the right to make changes to the
information contained in this document without notice. When you consider any use or
application of AKM product stipulated in this document (“Product”), please make inquiries the
sales office of AKM or authorized distributors as to current status of the Products.
1. All information included in this document are provided only to illustrate the operation and
application examples of AKM Products. AKM neither makes warranties or representations with
respect to the accuracy or completeness of the information contained in this document nor
grants any license to any intellectual property rights or any other rights of AKM or any third
party with respect to the information in this document. You are fully responsible for use of such
information contained in this document in your product design or applications. AKM ASSUMES
NO LIABILITY FOR ANY LOSSES INCURRED BY YOU OR THIRD PARTIES ARISING FROM
THE USE OF SUCH INFORMATION IN YOUR PRODUCT DESIGN OR APPLICATIONS.
2. The Product is neither intended nor warranted for use in equipment or systems that require
extraordinarily high levels of quality and/or reliability and/or a malfunction or failure of which
may cause loss of human life, bodily injury, serious property damage or serious public impact,
including but not limited to, equipment used in nuclear facilities, equipment used in the
aerospace industry, medical equipment, equipment used for automobiles, trains, ships and
other transportation, traffic signaling equipment, equipment used to control combustions or
explosions, safety devices, elevators and escalators, devices related to electric power, and
equipment used in finance-related fields. Do not use Product for the above use unless
specifically agreed by AKM in writing.
3. Though AKM works continually to improve the Product’s quality and reliability, you are
responsible for complying with safety standards and for providing adequate designs and
safeguards for your hardware, software and systems which minimize risk and avoid situations
in which a malfunction or failure of the Product could cause loss of human life, bodily injury or
damage to property, including data loss or corruption.
4. Do not use or otherwise make available the Product or related technology or any information
contained in this document for any military purposes, including without limitation, for the design,
development, use, stockpiling or manufacturing of nuclear, chemical, or biological weapons or
missile technology products (mass destruction weapons). When exporting the Products or
related technology or any information contained in this document, you should comply with the
applicable export control laws and regulations and follow the procedures required by such laws
and regulations. The Products and related technology may not be used for or incorporated into
any products or systems whose manufacture, use, or sale is prohibited under any applicable
domestic or foreign laws or regulations.
5. Please contact AKM sales representative for details as to environmental matters such as the
RoHS compatibility of the Product. Please use the Product in compliance with all applicable
laws and regulations that regulate the inclusion or use of controlled substances, including
without limitation, the EU RoHS Directive. AKM assumes no liability for damages or losses
occurring as a result of noncompliance with applicable laws and regulations.
6. Resale of the Product with provisions different from the statement and/or technical features set
forth in this document shall immediately void any warranty granted by AKM for the Product and
shall not create or extend in any manner whatsoever, any liability of AKM.
7. This document may not be reproduced or duplicated, in any form, in whole or in part, without
prior written consent of AKM.
Rev. 0.7
-3-
2015/7
51mcu
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