ASAHI KASEI [AK9844A]
DAD05E-00 2005/03
- 1 -

AK9844A
4Kbit EEPROM with 4ch 8bit D/A Converter

General Description

The AK9844A includes 4 channel, 8-bit D/A converters with on-chip output buffer amps and it is
capable to store the input digital data of each D/A converter by on-chip non-volatile CMOS
EEPROM. The AK9844A is optimally designed for various circuit adjustments for consumer and
industrial equipments and it is ideally suited for replacing mechanical trimmers.


Features

… EEPROM section
・4 word x 8-bit organization (Dedicated for DAC data)
・256 word x 16-bit organization (General purpose memory)
・Serial data interface
・Sequential register read
・Automatic write cycle
・100K write cycles
・10 year data retention

… D/A section
・4 channels
・Resolution : 8-bits
・Differential Non-Linearity : ±1.0 LSB
・Linearity Error : ±1.5 LSB
・Output Voltage Range : GND to VCC

… AUTO READ Function
… Power down mode

















Block Diagram
8bit D/A
8bit D/A
8bit D/A
8bit Latch
8bit Latch
8bit Latch
EEPROM
4128bit
256 x 16bit
+ 4 x 8bit
8
8
CS
Control Logic
Instruction
Register
Data
Register
Latch Decoder
SK
PROTECT
PD
8
8bit Latch
+
--
8bit D/A
AO0
8 +
--
AO2
8 +
--
AO3
8 +
--
AO1
VREF1
DI
DO
VCC
GND
VREF2