a us t ria
m i c r o
s y s t e m s
AS1504, AS1505
O c ta l 8 - B i t P r o g r a m m a b l e L o w - P o w e r D A C s w i t h
S h u td o w n a n d M i d - S c a l e R e s e t
D a ta S he e t
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.
Table 1. Standard Products
Model
AS1504
AS1505
Functionality
Mid-Scale Reset Pin
Separate V
REFL
Range Settings
2 Key Features
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8 Individually-Controlled DACs
Replaces 8 Potentiometers
Standard 3-Wire Serial Interface
Single-Supply Operation: +3 to +5V
Mid-Scale Reset Pin (AS1504)
Separate V
REFL
Range Setting (AS1505)
Shutdown Mode:
≤25µW
(I
DD
and I
REF
)
Power-On Reset
16-pin SOIC-150 Package
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.
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.
Figure 1. Block Diagram
V
REFH
V
REFH
DAC1 V
OUT
V
REFL
V
REFL
AS1505 Only
8-Bit
Latch
CK RSN
DAC 1
Select
8
Address
3
11-Bit
Serial Latch 8
D
CK
RSN
OUT1
8
V
DD
GND
SDI
CLK
CSN
8-Bit
Latch
CK RSN
AS1504/
AS1505
RSN
AS1504 Only
V
REFH
DAC8 V
OUT
V
REFL
8
OUT8
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