Document
FEATURES
nn SO-8 Package (LTC1595) nn DNL and INL: 1LSB Max nn Low Glitch Impulse: 1nV-s Typ nn Fast Settling to 1LSB: 2µs (with LT1468) nn Pin Compatible with Industry Standard
12-Bit DACs: DAC8043 and DAC8143/AD7543 nn 4-Quadrant Multiplication nn Low Supply Current: 10µA Max nn Power-On Reset
nn LTC1595/LTC1596: Resets to Zero-Scale nn LTC1596-1: Resets to Mid-Scale nn 3-Wire SPI and MICROWIRE Compatible Serial Interface nn Daisy-Chain Serial Output (LTC1596) nn Asynchronous Clear Input nn LTC1596: Clears to Zero-Scale nn LTC1596-1: Clears to Mid-Scale
APPLICATIONS
nn Process Control and Industrial Automation nn Software Controlled Gain Adjustment nn Digitally Controlled Filter and Power Supplies nn Automatic Test Equipment
LTC1595/LTC1596/LTC1596-1 Serial 16-Bit
Multiplying DACs
DESCRIPTION
The LTC®1595/LTC1596/LTC1596-1 are serial input, 16‑bit multiplying current output DACs. The LTC1595 is pin and hardware compatible with the 12-bit DAC8043 and comes in 8-pin PDIP and SO packages. The LTC1596 is pin and hardware compatible with the 12-bit DAC8143/AD7543 and comes in the 16-pin SO wide package. Both are specified over the industrial temperature range. Sensitivity of INL to op amp VOS is reduced by five times compared to the industry standard 12-bit DACs, so most systems can be easily upgraded to true 16-bit resolution and linearity without requiring more precise op amps. These DACs include an internal deglitching circuit that reduces the glitch impulse by more than ten times to less than 1nV-s typ. The DACs have a clear input and a power-on reset. The LTC1595 and LTC1596 reset to zero-scale. The LTC1596‑1 is a version of the LTC1596 that resets to mid-scale.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
SO-8 Multiplying 16-Bit DAC Has Easy 3-Wire Serial Interface
VIN
CLOCK DATA LOAD
5V
8 12
7 6 5
VDD CLK SRI
LD
VREF RFB LTC1595 OUT1
3
GND 4
33pF
– +LT®1468
VOUT
1595/96 TA01
INTEGRAL NONLINEARITY (LSB)
1.0 0.8 0.6 0.4 0.2
0 –0.2 –0.4 –0.6 – 0.8 –1.0
0
Integral Nonlinearity
16384 32768 49152 DIGITAL INPUT CODE
65535
1595/96 TA02
For more information www.linear.com/LTC1595
159561fc
1
LTC1595/LTC1596/LTC1596-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VDD to AGND................................................ –0.5V to 7V VDD to DGND............................................... –0.5V to 7V AGND to DGND ............................................ VDD + 0.5V DGND to AGND .............................................VDD + 0.5V VREF to AGND, DGND...............................................±25V RFB to AGND, DGND.................................................±25V Digital Inputs to DGND ................ –0.5V to (VDD + 0.5V)
VOUT1, VOUT2 to AGND.................. –0.5V to (VDD + 0.5V) Maximum Junction Temperature........................... 150°C Operating Temperature Range .