1

LTC1860L/LTC1861L

18601Lf

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

µPower, 3V, 12-Bit, 150ksps

1- and 2-Channel ADCs in MSOP

Single 3V Supply, 150ksps, 12-Bit Sampling ADC

Supply Current vs Sampling Frequency

The LTC

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

single 3V supply. At 150ksps, the supply current is only

450

µA. The supply current drops at lower speeds because

the LTC1860L/LTC1861L automatically power down be-

tween conversions. These 12-bit switched capacitor suc-

cessive approximation ADCs include sample-and-holds.

The LTC1860L has a differential analog input with an

external reference pin. The LTC1861L offers a software-

selectable 2-channel MUX and an external 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.

s

12-Bit 150ksps ADCs in MSOP Package

s

Single 3V Supply

s

Low Supply Current: 450

µA (Typ)

s

Auto Shutdown Reduces Supply Current

to 10

µA at 1ksps

s

True Differential Inputs

s

1-Channel (LTC1860L) or 2-Channel (LTC1861L)

Versions

s

SPI/MICROWIRE

s

High Speed Upgrade to LTC1285/LTC1288

s

Pin Compatible with 16-Bit LTC1864L/LTC1865L

s

No Minimum Data Transfer Rate

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

s

High Speed Data Acquisition

s

Portable or Compact Instrumentation

s

Low Power Battery-Operated Instrumentation

s

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

LTC1860L

1860L TA01

ANALOG INPUT

0V TO 3V

3V

1

µF

SERIAL DATA LINK TO

ASIC, PLD, MPU, DSP

OR SHIFT REGISTERS

SAMPLING FREQUENCY (kHz)

0.1

1

10

100

1000

0.01

1

10

1000

1860L/61L TA02

0.1

100

CONV LOW = 1.5

µs