LTC1860 Datasheet, PDF (1/12 Pages) Linear Technology – mPower, 12-Bit, 250ksps 1- and 2-Channel ADCs in MSOP

FEATURES
s _{12-Bit 250ksps ADCs in MSOP Package}
s _{Single 5V Supply}
s _{Low Supply Current: 850µA (Typ)}
s _{Auto Shutdown Reduces Supply Current}
to 2µA at 1ksps
s _{True Differential Inputs}
s _{1-Channel (LTC1860) or 2-Channel (LTC1861)}
Versions
s _{SPI/MICROWIRE}^TM _{Compatible Serial I/O}
s _{High Speed Upgrade to LTC1286/LTC1298}
s _{Pin Compatible with 16-Bit LTC1864/LTC1865}
U
APPLICATIO S
s _{High Speed Data Acquisition}
s _{Portable or Compact Instrumentation}
s _{Low Power Battery-Operated Instrumentation}
s _{Isolated and/or Remote Data Acquisition}
LTC1860/LTC1861
µPower, 12-Bit, 250ksps
1- and 2-Channel ADCs in MSOP
DESCRIPTIO
The LTC^®1860/LTC1861 are 12-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 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
TYPICAL APPLICATIO
Single 5V Supply, 250ksps, 12-Bit Sampling ADC
1µF
5V
ANALOG INPUT
0V TO 5V
LTC1860
1
V_REF
2 _IN+
8
V_CC
7
SCK
3 _IN–
6
SDO
4
GND
5
CONV
1860 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
1860 TA02
18601f
1