LTC2704-12 LINER [Linear Technology], LTC2704-12 Datasheet

LTC2704-12

Manufacturer Part Number

LTC2704-12

Description

Manufacturer

LINER [Linear Technology]

Datasheet

1.LTC2704-12.pdf (20 pages)

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FEATURES

APPLICATIONS

■

TYPICAL APPLICATION

Tiny 3mm × 3mm 8-Pin DFN Package

Maximum 16-Bit INL Error: ±2LSB over Temperature

Low 120μA Supply Current

Guaranteed Monotonic over Temperature

Low 0.5nV•sec Glitch Impulse

2.7V to 5.5V Single Supply Operation

Fast 1μs Settling Time to 16 Bits

Unbuffered Voltage Output Directly Drives 60k Loads

50MHz SPI

Serial Interface

Power-On Reset Clears DAC Output to Zero Scale

(LTC2641) or Midscale (LTC2642)

Schmitt-Trigger Inputs for Direct Optocoupler

Interface

Asynchronous ⎯ C ⎯ L ⎯ R Pin

8-Lead MSOP and 3mm × 3mm DFN Packages

(LTC2641)

10-Lead MSOP and 3mm × 3mm DFN Packages

(LTC2642)

High Resolution Offset and Gain Adjustment

Process Control and Industrial Automation

Automatic Test Equipment

Data Aquisition Systems

2.7V TO 5.5V

SCLK

DIN

CLR

LTC2642

POWER-ON

CONTROL

RESET

LOGIC

/QSPI

16-BIT SHIFT REGISTER

/MICROWIRE

16-BIT DATA LATCH

0.1μF

16-BIT DAC

Bipolar 16-Bit DAC

REF

1μF

GND

Compatible

0.1μF

INV

OUT

26412 TA01a

2V TO V

REF

5pF

–

1/2 LT1678

16-/14-/12-Bit V

DESCRIPTION

The LTC

unbuffered voltage output DACs. These DACs operate from

a single 2.7V to 5.5V supply and are guaranteed monotonic

over temperature. The LTC2641-16/LTC2642-16 provide

16-bit performance (±2LSB INL and ±1LSB DNL) over

temperature. Unbuffered DAC outputs result in low supply

current of 120μA and a low offset error of ±1LSB.

Both the LTC2641 and LTC2642 feature a reference input

range of 2V to V

bipolar operation, the LTC2642 includes matched scaling

resistors for use with an external precision op amp (such

as the LT1678), generating a ±V

The LTC2641/LTC2642 use a simple SPI/MICROWIRE

compatible 3-wire serial interface which can be operated

at clock rates up to 50MHz and can interface directly

with optocouplers for applications requiring isolation. A

power-on reset circuit clears the LTC2641’s DAC output

to zero scale and the LTC2642’s DAC output to midscale

when power is initially applied. A logic low on the ⎯ C ⎯ L ⎯ R pin

asynchronously clears the DAC to zero scale (LTC2641)

or midscale (LTC2642). These DACs are all speciﬁ ed over

the commercial and industrial ranges.

All other trademarks are the property of their respective owners.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

BIPOLAR V

–V

REF

TO V

OUT

REF

2641/LTC2642 are families of 16-, 14- and 12-bit

. V

LTC2641/LTC2642

3mm × 3mm DFN

–0.2

–0.4

–0.6

–1.0

–0.8

1.0

0.8

0.6

0.4

0.2

LTC2642-16 Integral Nonlinearity

OUT

±2.5V RANGE

REF

= 5V

swings from 0V to V

= 2.5V

16384

OUT

REF

32768

CODE

output swing at R

DACs in

49152

INL 25°C

INL 90°C

INL –45°C

LT1372 • G10

65535

REF

. For

26412f

Related parts for LTC2704-12

LTC2704-12 Summary of contents

Page 1

FEATURES Tiny 3mm × 3mm 8-Pin DFN Package ■ ■ Maximum 16-Bit INL Error: ±2LSB over Temperature ■ Low 120μA Supply Current ■ Guaranteed Monotonic over Temperature ■ Low 0.5nV•sec Glitch Impulse ■ 2.7V to 5.5V Single Supply Operation ■ ...

Page 2

LTC2641/LTC2642 ABSOLUTE MAXIMUM RATINGS V to GND .................................................. –0. ⎯ C ⎯ SCLK, DIN, ⎯ C ⎯ L ⎯ GND ........................ –0. REF INV to GND ........ –0.3V to ...

Page 3

ORDER INFORMATION LTC2641 LEAD FREE FINISH TAPE AND REEL LTC2641CDD-16#PBF LTC2641CDD-16#TRPBF LTC2641CDD-14#PBF LTC2641CDD-14#TRPBF LTC2641CDD-12#PBF LTC2641CDD-12#TRPBF LTC2641IDD-16#PBF LTC2641IDD-16#TRPBF LTC2641IDD-14#PBF LTC2641IDD-14#TRPBF LTC2641IDD-12#PBF LTC2641IDD-12#TRPBF LTC2641CMS8-16#PBF LTC2641CMS8-16#TRPBF LTC2641CMS8-14#PBF LTC2641CMS8-14#TRPBF LTC2641CMS8-12#PBF LTC2641CMS8-12#TRPBF LTC2641IMS8-16#PBF LTC2641IMS8-16#TRPBF LTC2641IMS8-14#PBF LTC2641IMS8-14#TRPBF LTC2641IMS8-12#PBF LTC2641IMS8-12#TRPBF LTC2642 LTC2642CDD-16#PBF LTC2642CDD-16#TRPBF LTC2642CDD-14#PBF LTC2642CDD-14#TRPBF LTC2642CDD-12#PBF LTC2642CDD-12#TRPBF ...

Page 4

LTC2641/LTC2642 ELECTRICAL CHARACTERISTICS temperature range, otherwise speciﬁ cations are at T otherwise specified. SYMBOL PARAMETER CONDITIONS Static Peformance N Resolution Monotonicity DNL Differential Nonlinearity (Note 2) INL Integral Nonlinearity (Note 2) ZSE Zero Code Offset Error Code = 0 ZS ...

Page 5

ELECTRICAL CHARACTERISTICS temperature range, otherwise speciﬁ cations are at T otherwise specified. SYMBOL PARAMETER I Digital Input Current IN C Digital Input Capacitance IN V Hysteresis Voltage H Power Supply V Supply Voltage DD I Supply Current ...

Page 6

LTC2641/LTC2642 TYPICAL PERFORMANCE CHARACTERISTICS Integral Nonlinearity (INL) 1.0 LTC2642-16 0 2.5V REF 0.6 DD 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1.0 0 16384 32768 49152 65535 CODE 26412 G01 Differential Nonlinearity (DNL) 1.0 LTC2642-16 ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS Bipolar Gain Error vs Temperature 2.5V REF –1 –2 –3 –4 –5 –40 – TEMPERATURE (°C) 26412 G10 14-Bit Integral Nonlinearity (INL) ...

Page 8

LTC2641/LTC2642 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current ( Temperature 150 V = 2.5V REF 125 100 –40 – TEMPERATURE (°C) 26412 G19 Supply ...

Page 9

PIN FUNCTIONS LTC2641 REF (Pin 1): Reference Voltage Input. Apply an external reference at REF between 2V and V ⎯ C ⎯ S (Pin 2): Serial Interface Chip Select/Load Input. When ⎯ C ⎯ low, SCLK is enabled ...

Page 10

LTC2641/LTC2642 BLOCK DIAGRAMS LTC2641 REF DD LTC2641-16 LTC2641-14 LTC2641-12 POWER-ON 16-/14-/12-BIT DAC RESET CS 2 SCLK 3 CONTROL 16-BIT DATA LATCH DIN LOGIC 4 CLR 16-BIT SHIFT REGISTER 5 TIMING DIAGRAM SCK SDI ...

Page 11

OPERATION The digital-to-analog transfer function at the V is: ⎛ ⎞ ⎝ ⎜ ⎠ ⎟ OUT IDEAL ( ) REF N 2 where k is the decimal equivalent of the binary DAC input code ...

Page 12

LTC2641/LTC2642 OPERATION Power-On Reset The LTC2641/LTC2642 include a power-on reset circuit to ensure that the DAC ouput comes known state. When V is ﬁ rst applied, the power-on reset circuit sets DD the output of the LTC2641 ...

Page 13

APPLICATIONS INFORMATION Bipolar Conﬁ guration Figure 3 shows a typical bipolar DAC application for the LTC2642. The on-chip bipolar offset/gain resistors, R and R , are connected to an external ampliﬁ produce INV a bipolar output swing from ...

Page 14

LTC2641/LTC2642 APPLICATIONS INFORMATION Unbuffered Operation and V Loading OUT The DAC output is available directly at the V swings from GND Unbuffered operation provides REF the lowest possible offset, full-scale and linearity errors, the fastest settling time ...

Page 15

APPLICATIONS INFORMATION such as the LTC6078 is suitable, if the application does not require linear operation very near to GND, or zero scale (Figure 2). The LTC6078 typically swings to within 1mV of GND not required to ...

Page 16

LTC2641/LTC2642 APPLICATIONS INFORMATION Op Amp Speciﬁ cations and Bipolar DAC Accuracy The op amp contributions to unipolar DAC error discussed above apply equally to bipolar operation. The bipolar ap- plication circuit gains up the DAC span, and all errors, by ...

Page 17

APPLICATIONS INFORMATION Digital Inputs and Interface Logic All of the digital inputs include Schmitt-trigger buffers to accept slow transition interfaces. This means that op- tocuplers can interface directly to the LTC2641/LTC2642 without additional external logic. Digital input hysteresis is typically ...

Page 18

LTC2641/LTC2642 PACKAGE DESCRIPTION 3.5 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) 0.25 ± 0.05 0.50 BSC 2.38 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1) ...

Page 19

PACKAGE DESCRIPTION 0.889 ± 0.127 (.035 ± .005) 5.23 3.20 – 3.45 (.206) (.126 – .136) MIN 0.42 ± 0.038 0.65 (.0165 ± .0015) (.0256) TYP BSC RECOMMENDED SOLDER PAD LAYOUT NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO ...

Page 20

... LTC1591/LTC1597 Parallel 14-/16-Bit Current Output DACs LTC1599 16-Bit Current Output DAC LTC1650 16-Bit Voltage Output DAC LTC2621/LTC2611 12-/14-/16-Bit Serial Voltage Output DACs LTC2601 LTC2704-12 12-/14-/16-Bit Quad Voltage Output DACs LTC2704-14 LTC2704-16 Op Amps LT ® 1678 Dual Low Noise Rail-to-Rail Precision Op Amp ...

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