LTC2758

1

2758fb

Typical applicaTion

FeaTures

applicaTions

DescripTion

Dual Serial 18-Bit

The LTC®2758 is a dual 18-bit multiplying serial-input,

current-output digital-to-analog converter. LTC2758A

provides full 18-bit performance (INL and DNL of ±1LSB

maximum) over temperature without any adjustments.

18-bit monotonicity is guaranteed in all performance

grades. This SoftSpan™ DAC operates from a single 3V

to 5V supply and offers six output ranges (up to ±10V)

that can be programmed through the 3-wire SPI serial

interface or pin-strapped for operation in a single range.

Any on-chip register (including DAC output-range set-

tings) can be read for verification in just one instruction

cycle; and if you change register content, the altered

register will be automatically read back during the next

instruction cycle.

Voltage-controlled offset and gain adjustments are also

provided; and the power-on reset circuit and CLR pin both

reset the DAC outputs to 0V regardless of output range.

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property

of their respective owners.

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Maximum 18-Bit INL Error: ±1 LSB Over Temperature

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Program or Pin-Strap Six Output Ranges:

0V to 5V, 0V to 10V, –2.5V to 7.5V, ±2.5V, ±5V, ±10V

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Guaranteed Monotonic Over Temperature

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18-Bit Settling Time: 2.1µs

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2.7V to 5.5V Single Supply Operation

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1µA Maximum Supply Current

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Voltage-Controlled Offset and Gain Trims

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Serial Interface with Readback of All Registers

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Clear and Power-On-Reset to 0V Regardless of

Output Range

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48-Pin 7mm × 7mm LQFP Package

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Instrumentation

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Medical Devices

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Automatic Test Equipment

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Process Control and Industrial Automation

LTC2758 Integral Nonlinearity

CODE

0

65536

–1.0

–0.8

–0.6

–0.4

–0.2

0.6

0.4

0.2

0

0.8

1.0

131072

196608

262143

2758 TA01b

0V TO 10V RANGE

LTC2758

5V

4

SPI WITH

READBACK

GND

DAC B

DAC A

REFERENCE

5V

REFA

REFERENCE

5V

REFB

–

+

2758 TA01a

LT1012

LT1012

LT1468

LT1468

0.1µF

OFFSET A ADJUST

OFFSET B ADJUST

GAIN A

ADJUST

GAIN B

ADJUST

27pF

27pF