LTC1401 Datasheet, PDF (1/20 Pages) Linear Technology – Complete SO-8, 12-Bit, 200ksps ADC with Shutdown

FEATURES
s _{Complete 12-Bit ADC with Reference in SO-8}
s _{Single Supply 3V Operation}
s _{Sample Rate: 200ksps}
s _{Power Dissipation: 15mW (Typ)}
s _{68dB S/(N + D) and – 72dB THD at 50kHz}
s _{No Missing Codes Over Temperature}
s _{Nap Mode with Instant Wake-Up: 1.5mW}
s _{Sleep Mode: 19.5µW}
s _{Shutdown Mode: 13.5µW}
s _{High Impedance Analog Input}
s _{Input Range (0.5mV/LSB): 0V to 2.048V}
s _{Internal Reference Can Be Overdriven Externally}
s _{3-Wire Interface to DSPs and Processors (SPI and}
MICROWIRE^TM Compatible)
U
APPLICATIONS
s _{Low Power and Battery-Operated Systems}
s _{Handheld or Portable Instruments}
s _{High Speed Data Acquisition}
s _{Digital Signal Processing}
s _{Multiplexed Data Acquisition Systems}
s _{Telecommunication}
s _{Digital Radio}
s _{Spectrum Analysis}
LTC1401
Complete
SO-8, 12-Bit, 200ksps
ADC with Shutdown
DESCRIPTION
The LTC ^®1401 is a complete 200ksps, 12-bit A/D con-
verter that converts 0V to 2.048V unipolar input and draws
only 15mW from a single 3V supply. This easy-to-use
device comes complete with a 315ns sample-and-hold
and a precision reference. Maximum DC specifications
include ±1LSB INL, ±1LSB DNL and 45ppm/°C full-scale
drift over temperature.
The LTC1401 has three power saving modes: Nap and
Sleep, through the serial interface and Shutdown by
setting the SHDN pin to zero. In Nap mode, it consumes
only 1.5mW of power and can wake up and convert
immediately. In Sleep (Shutdown) mode, it consumes
19.5µW (13.5µW) of power typically. Upon power-up
from Sleep or Shutdown mode, a reference ready (REFRDY)
signal is available in the serial word to indicate that the
reference has settled and the chip is ready to convert.
The 3-wire serial port allows compact and efficient data
transfer to a wide range of microprocessors, microcon-
trollers and DSPs.
, LTC and LT are registered trademarks of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
TYPICAL APPLICATION
Single 3V Supply, 200kHz, 12-Bit Sampling A/D Converter
3V
+
10µF
ANALOG INPUT
(0V TO 2.048V)
1.20V ₊
10µF
1
V_CC
8
SHDN
0.1µF
LTC1401
2
A_IN
7
CONV
3 _VREF
4
0.1µF GND
CLK
D_OUT
6
5
SERIAL
DATA LINK
MPU
P1.4
P1.3
P1.2
1401 TA01
Power Consumption vs Sample Rate
100
3.2MHz CLOCK
T_A = 25°C
10
NORMAL CONVERSION
NAP MODE
1
BETWEEN CONVERSION
0.1
SHUTDOWN MODE
0.01
BETWEEN CONVERSION
SLEEP MODE BETWEEN
CONVERSION
0.001
0.01 0.1 1 10 100 1k 10k 100k 1M
SAMPLE RATE (Hz)
LTC1401 • TA02
1