AK8456 Datasheet, PDF (4/32 Pages) Asahi Kasei Microsystems – 3 channel input 16bit 30MSPS Video ADC with LED driver

[AK8456]
 ADC
After offset adjust, the ADC convert analog signal level to digital data. The ADC has 16-bit resolution
and 30MSPS maximum conversion ratio. The output code is straight binary, 0000h corresponds to
black signal and FFFFh corresponds to white signal.
 Digital PGA
The digital PGA amplifies A/D data. Its gain range is 0dB~18dB and gain resolution is 8bit.
 Output Control Block
The output control block converts 16-bit width data to two 8-bit width data. Higher 8-bit is output at
ADCK rising edge and lower 8-bit is output at ADCK falling edge. Gray code output is possible too
by register setting.
 Reference Voltage Generation Block
Reference Voltage
This block generates internal reference voltage VRP, sensor reference voltage VDC and LDO
reference voltage.
 Internal Clock Generation Block
Clock Gen
This block generates internal pulses using A/D clock ADCK and sampling pulse SHD.
 LED Driver Control Block
LED Control
This block controls LED switching and LED current. LED current is adjustable from 100% to12.5%
by 12.5% step channel independently. 100% current is 67.2mA per channel.
 Serial Interface Block Serial I/F
Control registers are written and read through 3-wire serial interface.
 Low Dropout Voltage Regulator LDO
The LDO generate 1.8V supply from 3.3V of AVDD. The 1.8V is used for internal circuit. There are
two LDO for analog circuit and digital circuit.
014002433-E-00
-4-
2014/06