LTC1860L_15 Datasheet, PDF (1/12 Pages) Linear Technology – Power, 3V, 12-Bit, 150ksps 1- and 2-Channel ADCs in MSOP

LTC1860L/LTC1861L
µPower, 3V, 12-Bit, 150ksps
1- and 2-Channel ADCs in MSOP
FEATURES
s _{12-Bit 150ksps ADCs in MSOP Package}
s _{Single 3V Supply}
s _{Low Supply Current: 450µA (Typ)}
s _{Auto Shutdown Reduces Supply Current}
to 10µA at 1ksps
s _{True Differential Inputs}
s _{1-Channel (LTC1860L) or 2-Channel (LTC1861L)}
Versions
s _{SPI/MICROWIRE}^TM _{Compatible Serial I/O}
s _{High Speed Upgrade to LTC1285/LTC1288}
s _{Pin Compatible with 16-Bit LTC1864L/LTC1865L}
s _{No Minimum DataUTransfer Rate}
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}
DESCRIPTIO
The LTC^®1860L/LTC1861L are 12-bit A/D converters that
are offered in MSOP and SO-8 packages and operate on a
single 3V supply. At 150ksps, the supply current is only
450µA. 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
TYPICAL APPLICATIO
Single 3V Supply, 150ksps, 12-Bit Sampling ADC
1µF
3V
ANALOG INPUT
0V TO 3V
LTC1860L
1
V_REF
2 _IN+
8
V_CC
7
SCK
3 _IN–
6
SDO
4
GND
CONV
5
1860L TA01
SERIAL DATA LINK TO
ASIC, PLD, MPU, DSP
OR SHIFT REGISTERS
Supply Current vs Sampling Frequency
1000
100
CONV LOW = 1.5µs
T_A = 25°C
V_CC = 2.7V
10
1
0.1
0.01
0.1
1
10 100 1000
SAMPLING FREQUENCY (kHz)
1860L/61L TA02
18601Lf
1