ASAHI KASEI
[AK9844A]
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
・Differential
Non-Linearity
・Linearity
Error
・Output
Voltage Range
AUTO READ Function
Power down mode
SK
CS
VREF1
: 8-bits
: ±1.0 LSB
: ±1.5 LSB
: GND to VCC
PROTECT
Control Logic
Instruction
Register
Data
Register
Latch Decoder
--
+
DI
8bit Latch
8
8bit D/A
AO0
DO
8
8
8bit Latch
8
8bit D/A
--
+
AO1
VCC
8bit Latch
GND
8
8bit D/A
--
+
AO2
EEPROM
4128bit
256 x 16bit
+ 4 x 8bit
8bit Latch
8
8bit D/A
--
+
AO3
PD
VREF2
Block Diagram
DAD05E-00
- 1 -
2005/03
AKM [ ASAHI KASEI MICROSYSTEMS ]
