AS1504-T

a u s t ri a 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) individually programmable 8-channel, 8-bit resolution digital-toanalog converters. All eight DACs share a common reference-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 VREFL Range Settings 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 The devices feature a low-power shutdown reference input current (5µA) that enables the devices to maintain individual DAC latch settings during shutdown until normal 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 VREFH VREFH DAC1 VOUT VREFL VREFL AS1505 Only 8-Bit Latch CK RSN DAC 1 Select 8 Address 3 11-Bit Serial Latch 8 D CK RSN OUT1 8 VDD GND SDI CLK CSN 8-Bit Latch CK RSN AS1504/ AS1505 RSN AS1504 Only VREFH DAC8 VOUT VREFL 8 OUT8 SHDNN www.austriamicrosystems.com Revision 1.0 1 - 17 AS1504, AS1505 Data Sheet austria m i c r o systems 4 Absolute Maximum Ratings Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in Electrical Characteristics on page 3 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 2. Absolute Maximum Ratings Parameter VDD to GND VREFH and VREFH to GND OUTx to GND Digital Input Voltage to GND Package Power Dissipation Operating Temperature Range Storage Temperature Range Maximum Junction Temperature (TJ Max) Thermal Resistance (θJA) Electro-Static Discharge -40 -65 +85 +150 +150 60