ltc1654cgn-trpbf Linear Technology Corporation, ltc1654cgn-trpbf Datasheet

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ltc1654cgn-trpbf

Manufacturer Part Number
ltc1654cgn-trpbf
Description
Ltc1654 - Dual 14-bit Rail-to-rail Dac In 16-lead Ssop Package
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
BLOCK DIAGRA
APPLICATIO S
14-Bit Monotonic Over Temperature
Individually Programmable Speed/Power:
3V to 5V Single Supply Operation
Maximum Update Rate: 0.9MHz
Buffered True Rail-to-Rail Voltage Outputs
User Selectable Gain
Power-On Reset and Clear Function
Schmitt Trigger On Clock Input Allows Direct
Optocoupler Interface
Smallest Dual 14-Bit DAC: 16-Lead Narrow
SSOP Package
Digital Calibration
Industrial Process Control
Automatic Test Equipment
Offset/Gain Adjustment
Multiplying DAC
3µs Settling Time at 930µA
8.5µs Settling Time at 540µA
CS/LD
U
SDO
SCK
SDI
CLR
W
REGISTER
CONTROL
32-BIT
LOGIC
SHIFT
POWER-ON
LATCH
LATCH
RESET
INPUT
INPUT
REGISTER
REGISTER
DAC
DAC
REFLO B
Dual 14-Bit Rail-to-Rail DAC
DESCRIPTIO
The LTC
digital-to-analog converter (DAC). It is available in a
16-lead narrow SSOP package, making it the smallest dual
14-bit DAC available. It includes output buffer amplifiers
and a flexible serial interface.
The LTC1654 has REFHI pins for each DAC that can be
driven up to V
a gain of 1 configuration or V
ration. It operates from a single 2.7V to 5.5V supply.
The LTC1654 has two programmable speeds: a FAST and
SLOW mode with ±1LSB settling times of 3µs or 8.5µs
respectively and supply currents of 930µA and 540µA in
the two modes. The LTC1654 also has shutdown capabil-
ity, power-on reset and a clear function to 0V.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5396245.
in 16-Lead SSOP Package
DAC B
DAC A
, LTC and LT are registered trademarks of Linear Technology Corporation.
REFLO A
®
1654 is a dual, rail-to-rail voltage output, 14-bit
CC
. The output will swing from 0V to V
+
+
U
CC
/2 in a gain of 1/2 configu-
REFHI B
V
X
REFHI A
V
X
OUT B
1
OUT A
1
/X
/X
1654 BD
1/2
1/2
B
A
LTC1654
CC
1654fb
1
in

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ltc1654cgn-trpbf Summary of contents

Page 1

... The LTC1654 also has shutdown capabil- ity, power-on reset and a clear function to 0V. , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5396245. ...

Page 2

... Input Code = ±10%) REFHIA, REFHIB = 4.096V ( ±10%) REFHIA, REFHIB = 2.048V (V CC Input Code = 16383 U W ORDER PART TOP VIEW NUMBER OUT B LTC1654CGN 14 REFHI B LTC1654IGN 13 REFLO B 12 AGND 11 REFLO A GN PART MARKING 10 REFHI OUT A 1654 GN PACKAGE 1654I = 125° ...

Page 3

ELECTRICAL CHARACTERISTICS ture range, otherwise specifications are at T REFHI B = 4.096V (V = 5V), REFHI A, REFHI B = 2.048V (V CC SYMBOL PARAMETER AC Performance Voltage Output Slew Rate Voltage Output Settling Time Digital Feedthrough Midscale Glitch ...

Page 4

LTC1654 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T REFHI A, REFHI B = 4.096V (V = 5V), REFHI A, REFHI B = 2.048V (V CC SYMBOL PARAMETER Switching Characteristics (V = 2.7V to 5.5V SDO Output ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Logic Input Voltage 3.0 1 LOGIC INPUT VOLTAGE (V) 1654 G07 Midscale Glitch—Fast Mode V OUT 10mV/DIV CS/LD 2V/DIV TIME (1µs/DIV) 1654 G10 Large-Signal ...

Page 6

LTC1654 CTIO (Pins 1, 8): The Gain Gain of 1 1/2 1 1/2 1/2 Pin. When this pin is tied to V OUT be REFLO ...

Page 7

DIAGRA S LTC1654 1654fb 7 ...

Page 8

LTC1654 U OPERATIO Serial Interface The data on the SDI input is loaded into the shift register on the rising edge of SCK. The MSB is loaded first. The Clock is disabled internally when CS/LD is high. Note: SCK must ...

Page 9

U OPERATIO Voltage Output The LTC1654 comes complete with rail-to-rail voltage output buffer amplifiers. These amplifiers will swing to within a few millivolts of either supply rail when unloaded and to within a 450mV of either supply rail when sinking ...

Page 10

LTC1654 U OPERATIO Table 1. CONTROL Load Input Register Update (Power-Up) DAC Register Load Input Register n, Update (Power-Up) All 0 0 ...

Page 11

U U APPLICATIO S I FOR ATIO Rail-to-Rail Output Considerations Rail-to-rail DACs take full advantage of the supply range available to them, but cannot produce output voltages above V or below ground. See Figure 2a REFLO is tied ...

Page 12

LTC1654 U U DEFI ITIO S Resolution (n): Resolution is defined as the number of digital input bits (n also the number of DAC output n states (2 ) that divide the full-scale range. Resolution does not imply ...

Page 13

U TYPICAL APPLICATIO S This circuit shows how to use an LTC1654 and make a wide bipolar output swing 14-bit DAC with an offset that can be digitally programmed set by loading the appropriate code ...

Page 14

LTC1654 U TYPICAL APPLICATIO S µP 14 Dual 14-Bit Voltage Output DAC 2.7V TO 5.5V 0.1µF LTC1654 1 CLR OUTPUT OUT SCK ...

Page 15

... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 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. ...

Page 16

... DAC in MS8 Package. OUT Output Swings from GND to REF. REF Input Can Be Tied Low Cost, 10ppm Drift Ultralow Drift 3ppm/°C, Initial Accuracy: 0.04% Low Drift 10ppm/°C, Initial Accuracy: 0.05% LT/LT 0705 REV B • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2000 1654fb ...

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