LTC1864 Datasheet, PDF (1/20 Pages) Linear Technology – μPower, 16-Bit, 250ksps 1- and 2-Channel ADCs in MSOP

FEATURES
■ _{16-Bit 250ksps ADCs in MSOP Package}
■ _{Single 5V Supply}
■ _{Low Supply Current: 850µA (Typ)}
■ _{Auto Shutdown Reduces Supply Current}
to 2µA at 1ksps
■ _{True Differential Inputs}
■ _{1-Channel (LTC1864) or 2-Channel (LTC1865)}
Versions
■ _{SPI/MICROWIRE}^TM _{Compatible Serial I/O}
■ _{16-Bit Upgrade to 12-Bit LTC1286/LTC1298}
■ _{Pin Compatible with 12-Bit LTC1860/LTC1861}
U
APPLICATIO S
■ _{High Speed Data Acquisition}
■ _{Portable or Compact Instrumentation}
■ _{Low Power Battery-Operated Instrumentation}
■ _{Isolated and/or Remote Data Acquisition}
LTC1864/LTC1865
µPower, 16-Bit, 250ksps
1- and 2-Channel ADCs in MSOP
DESCRIPTIO
The LTC^®1864/LTC1865 are 16-bit A/D converters that are
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
TYPICAL APPLICATIO
Single 5V Supply, 250ksps, 16-Bit Sampling ADC
1µF
5V
ANALOG INPUT
0V TO 5V
LTC1864
1
V_REF
2 _IN+
8
V_CC
7
SCK
3 _IN–
6
SDO
4
GND
5
CONV
1864 TA01
SERIAL DATA LINK TO
ASIC, PLD, MPU, DSP
OR SHIFT REGISTERS
Supply Current vs Sampling Frequency
1000
100
10
1
0.1
0.01
0.01
0.1
1
10 100
SAMPLING FREQUENCY (kHz)
1000
1864 TA02
sn18645 18645fs
1