1

LTC1860/LTC1861

18601f

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

µPower, 12-Bit, 250ksps

1- and 2-Channel ADCs in MSOP

Single 5V Supply, 250ksps, 12-Bit Sampling ADC

Supply Current vs Sampling Frequency

The LTC

offered in MSOP and SO-8 packages and operate on a

single 5V supply. At 250ksps, the supply current is only

850

µA. The supply current drops at lower speeds because

the LTC1860/LTC1861 automatically power down to a

typical supply current of 1nA between conversions. These

12-bit switched capacitor successive approximation ADCs

include sample-and-holds. The LTC1860 has a differential

analog input with an adjustable reference pin. The LTC1861

offers a software-selectable 2-channel MUX and an ad-

justable reference pin on the MSOP version.

The 3-wire, serial I/O, MSOP or SO-8 package and

extremely high sample rate-to-power ratio make these

ADCs ideal choices for compact, low power, high speed

systems.

These ADCs can be used in ratiometric applications or with

external references. The high impedance analog inputs

and the ability to operate with reduced spans down to 1V

full scale, allow direct connection to signal sources in

many applications, eliminating the need for external gain

stages.

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12-Bit 250ksps ADCs in MSOP Package

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Single 5V Supply

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Low Supply Current: 850

µA (Typ)

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Auto Shutdown Reduces Supply Current

to 2

µA at 1ksps

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True Differential Inputs

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1-Channel (LTC1860) or 2-Channel (LTC1861)

Versions

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SPI/MICROWIRE

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High Speed Upgrade to LTC1286/LTC1298

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Pin Compatible with 16-Bit LTC1864/LTC1865

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

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High Speed Data Acquisition

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Portable or Compact Instrumentation

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Low Power Battery-Operated Instrumentation

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Isolated and/or Remote Data Acquisition

MICROWIRE is a trademark of National Semiconductor Corporation.

1

2

3

4

8

7

6

5

GND

SCK

SDO

CONV

LTC1860

1860 TA01

ANALOG INPUT

0V TO 5V

5V

1

µF

SERIAL DATA LINK TO

ASIC, PLD, MPU, DSP

OR SHIFT REGISTERS

SAMPLING FREQUENCY (kHz)

0.01

1000

100

10

1

0.1

0.01

100

1860 TA02

0.1

1

10

1000