AS1504, AS1505
Octal 8-Bit Programmable Low-Power DACs with
Shutdown and Mid-Scale Reset
austriamicrosystems
Data Sheet
www.austriamicrosystems.com Revision 1.0 1 - 17
1 General Description
The AS1504/AS1505 are low-power (5µA @ 5V) individ-
ually programmable 8-channel, 8-bit resolution digital-to-
analog converters. All eight DACs share a common ref-
erence-voltage input making them ideal for applications
where adjustments start at a nominal voltage.
The devices feature a low-power shutdown reference
input current (5µA) that enables the devices to maintain
individual DAC latch settings during shutdown until nor-
mal operation is resumed.
The devices are controlled via a standard 3-wire serial
interface. Data is shifted into the DACs via the internal
serial-to-parallel shift register.
The AS1504/AS1505 are available in a 16-pin SOIC-150
package.
Figure 1. Block Diagram
2 Key Features
! 8 Individually-Controlled DACs
! Replaces 8 Potentiometers
! Standard 3-Wire Serial Interface
! Single-Supply Operation: +3 to +5V
! Mid-Scale Reset Pin (AS1504)
! Separate VREFL Range Setting (AS1505)
! Shutdown Mode: ≤25µW (IDD and IREF)
! Power-On Reset
! 16-pin SOIC-150 Package
3 Applications
The devices are ideal for video amplifier gain control,
video equipment voltage-controlled frequencies and
bandwidths, CRT display geometric corrections and
automatic adjustments, or any other space-limited DAC
application with low power-consumption requirements.
Table 1. Standard Products
Model Functionality
AS1504 Mid-Scale Reset Pin
AS1505 Separate VREFL Range Settings
DAC
Select
DAC1
GND
VDD
SDI
CLK
CSN
AS1504 Only SHDNN
VREFH
VREFL
VOUTVREFL
VREFH
OUT1
DAC8
VREFH
VREFL
VOUT
OUT8
Address
11-Bit
Serial Latch
CK RSN
D
AS1504/
AS1505
8
8-Bit
Latch
CK RSN
1
8
8-Bit
Latch
CK RSN
3
8
8
AS1505 Only
RSN