LTC1595 Linear Technology, LTC1595 Datasheet

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LTC1595

Manufacturer Part Number
LTC1595
Description
Serial 16-Bit Multiplying DACs
Manufacturer
Linear Technology
Datasheet

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APPLICATIONS
TYPICAL
FEATURES
SO-8 Package (LTC1595)
DNL and INL: 1LSB Max
Low Glitch Impulse: 1nV-s Typ
Fast Settling to 1LSB: 2 s (with LT1468)
Pin Compatible with Industry Standard
12-Bit DACs: DAC8043 and DAC8143/AD7543
4-Quadrant Multiplication
Low Supply Current: 10 A Max
Power-On Reset
LTC1595/LTC1596: Resets to Zero Scale
LTC1596-1: Resets to Midscale
3-Wire SPI and MICROWIRE
Serial Interface
Daisy-Chain Serial Output (LTC1596)
Asynchronous Clear Input
LTC1596: Clears to Zero Scale
LTC1596-1: Clears to Midscale
Process Control and Industrial Automation
Software Controlled Gain Adjustment
Digitally Controlled Filter and Power Supplies
Automatic Test Equipment
CLOCK
LOAD
DATA
SO-8 Multiplying 16-Bit DAC Has Easy 3-Wire Serial Interface
V
IN
APPLICATION
7
6
5
CLK
SRI
LD
V
5V
DD
U
8
V
LTC1595
REF
1
GND
R
FB
2
4
OUT1
TM
U
Compatible
3
33pF
+
LT
®
1468
1595/96 TA01
V
OUT
The LTC
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 16-pin PDIP and SO wide packages.
Both are specified over the industrial temperature range.
Sensitivity of INL to op amp V
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 midscale.
MICROWIRE is a trademark of National Semiconductor Corporation.
DESCRIPTION
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC1595/LTC1596/LTC1596-1
®
1595/LTC1596/LTC1596-1 are serial input,
– 0.8
–0.2
–0.4
–0.6
–1.0
1.0
0.8
0.6
0.4
0.2
0
0
U
Multiplying DACs
16384
Integral Nonlinearity
DIGITAL INPUT CODE
OS
32768
Serial 16-Bit
is reduced by five times
49152
1595/96 TA02
65535
1

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LTC1595 Summary of contents

Page 1

... The DACs have a clear input and a power-on reset. The LTC1595 and LTC1596 reset to zero scale. The LTC1596 version of the LTC1596 that resets to midscale. , LTC and LT are registered trademarks of Linear Technology Corporation. ...

Page 2

... U RATINGS (Note OUT1 Maximum Junction Temperature .......................... 150 C + 0.5V Operating Temperature Range DD + 0.5V LTC1595C/LTC1596C/LTC1596-1C ........ LTC1595I/LTC1596I/LTC1596-1I ...... – Storage Temperature Range ................ – 150 C + 0.5V) Lead Temperature (Soldering, 10 sec)................. 300 OUT1 OUT2 AGND STB1 LD1 SRO SRI STB2 ...

Page 3

... Digital Output High Voltage OH V Digital Output Low Voltage 10 10V GND = 0V REF OUT1 SYMBOL PARAMETER Timing Characteristics (LTC1595) t Serial Input to CLK Setup Time DS t Serial Input to CLK Hold Time DH LTC1595/LTC1596/LTC1596-1 = AGND = 0V unless otherwise noted. A MIN MAX ...

Page 4

... LTC1595/LTC1596/LTC1596-1 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER t Serial Input Data Pulse Width SRI t Clock Pulse Width High CH t Clock Pulse Width Low CL t Load Pulse Width LD t LSB Clocked into Input Register ASB to DAC Register Load Time 10 10V REF OUT1 ...

Page 5

... D4 D3 – –100 ALL USING LT1122 OP AMP BITS OFF C = 33pF FEEDBACK –120 100 1k 100k 10k 1M 10M FREQUENCY (Hz) 1595/96 G07 LTC1595/LTC1596/LTC1596-1 Integral Nonlinearity (INL) 1.0 0.8 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 – 0.8 –1 16384 32768 49152 DIGITAL INPUT CODE Integral Nonlinearity vs Reference Voltage 1.0 ...

Page 6

... INPUT VOLTAGE ( PIN FUNCTIONS LTC1595 V (Pin 1): Reference Input. REF R (Pin 2): Feedback Resistor. Normally tied to the output FB of the current to voltage converter op amp. OUT1 (Pin 3): Current Output Pin. Tie to inverting input of current to voltage converter op amp. GND (Pin 4): Ground Pin. ...

Page 7

... DD LOAD LD 5 CLK DIAGRA (LTC1595 CLK INPUT PREVIOUS D15 WORD MSB SRI LD LTC1595/LTC1596/LTC1596-1 Table 2. LTC1596/LTC1596-1 DAC Register CONTROL INPUTS CLR LD1 56k 56k 56k 56k 112k DECODER D15 D14 D13 D12 ...

Page 8

... LTC1595/LTC1596/LTC1596-1 W BLOCK DIAGRA (LTC1596/LTC1596- REF 56k 56k 56k CLR 13 5 LD1 9 LD2 STB1 4 STB2 8 STB3 10 STB4 DIAGRA (LTC1596/LTC1596-1) STROBE INPUT STB1, STB2, STB4 (INVERT FOR STB3) D15 SRI MSB LD1, LD2 PD1 D15 (MSB) SRO ...

Page 9

... DACs on one 3-wire interface (see LTC1596 Timing Diagram). Unipolar (2-Quadrant Multiplying) Mode ( –V OUT The LTC1595/LTC1596 can be used with a single op amp to provide 2-quadrant multiplying operation as shown in Figure 1. With a fixed –10V reference, the circuits shown give a precision unipolar 0V to 10V output swing ...

Page 10

... Measurement Advances Ensure 16-Bit DAC Settling Time. ” Grounding As with any high resolution converter, clean grounding is important. A low impedance analog ground plane and star grounding should be used. I (LTC1595) must be tied to the star ground with as low a resistance as possible. COMMENTS 100pF Good Low Speed Choice ...

Page 11

... Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. LTC1595/LTC1596/LTC1596-1 U Dimensions in inches (millimeters) unless otherwise noted. ...

Page 12

... 33pF REF FB 7 CLK 6 3 – P SRI LTC1595 OUT1 5 LD 1/2 LT1112 GND + 4 (b) Figure 2. Bipolar Operation (4-Quadrant Multiplication) V RELATED PARTS PART NUMBER DESCRIPTION DACs LTC1590 Dual Serial I/O Multiplying I LTC1597 Parallel 16-Bit Current Output DAC LTC1650 Serial 16-Bit Voltage Output DAC ...

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