AK9240 Datasheet, PDF (1/3 Pages) Asahi Kasei Microsystems – AFE with Dual 12-Bit 1MSPS SAR ADC

[AK9240]
= Preliminary =
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
AIN0P
AIN0N
AIN1P
AIN1N
LED
Driver
Auto Power
Controller
2.5V
Reference
Current
Input
Voltage
Input
Current
Input
Voltage
Input
Current
Input
Voltage
Input
Current
Input
Voltage
Input
PGA0
SAR
ADC0
PGA1
SAR
ADC1
Serial I/F
&
Control
Logic
VDD VSS DRVDD
RSTN
CSN
SCLK
SDO0
SDO1
SDATI
SDATO
Figure 1. AK9240 Block Diagram
Rev. 0.7
-1-
2015/7