1

LTC1864/LTC1865

sn18645 18645fs

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

µPower, 16-Bit, 250ksps

1- and 2-Channel ADCs in MSOP

Single 5V Supply, 250ksps, 16-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

850µA. The supply current drops at lower speeds because

the LTC1864/LTC1865 automatically power down

between conversions. These 16-bit switched capacitor

successive approximation ADCs include sample-and-holds.

The LTC1864 has a differential analog input with an

adjustable reference pin. The LTC1865 offers a software-

selectable 2-channel MUX and an adjustable reference pin

on the MSOP version.

The 3-wire, serial I/O, small 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.

to 2µA at 1ksps

Versions

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

■

Low Power Battery-Operated Instrumentation

1

2

3

4

8

7

6

5

GND

SCK

SDO

CONV

LTC1864

1864 TA01

ANALOG INPUT

0V TO 5V

5V

1µF

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

1864 TA02

0.1

1

10

1000

MICROWIRE is a trademark of National Semiconductor Corporation.