LTC1401
Complete
SO-8, 12-Bit, 200ksps
ADC with Shutdown
U
FEATURES
DESCRIPTION
The LTC®1401 is a complete 200ksps, 12-bit A/D con-
verterthatconverts0Vto2.048Vunipolarinputanddraws
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.
■
Complete 12-Bit ADC with Reference in SO-8
■
Single Supply 3V Operation
■
Sample Rate: 200ksps
Power Dissipation: 15mW (Typ)
■
■
68dB S/(N + D) and – 72dB THD at 50kHz
■
No Missing Codes Over Temperature
■
Nap Mode with Instant Wake-Up: 1.5mW
■
Sleep Mode: 19.5µW
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
fromSleeporShutdownmode,areferenceready(REFRDY)
signal is available in the serial word to indicate that the
reference has settled and the chip is ready to convert.
■
Shutdown Mode: 13.5µW
■
High Impedance Analog Input
■
Input Range (0.5mV/LSB): 0V to 2.048V
■
Internal Reference Can Be Overdriven Externally
■
3-Wire Interface to DSPs and Processors (SPI and
MICROWIRETM Compatible)
U
APPLICATIONS
■
Low Power and Battery-Operated Systems
Handheld or Portable Instruments
High Speed Data Acquisition
Digital Signal Processing
Multiplexed Data Acquisition Systems
Telecommunication
Digital Radio
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.
■
■
■
Spectrum Analysis
U
TYPICAL APPLICATION
Power Consumption vs Sample Rate
100
3.2MHz CLOCK
A
Single 3V Supply, 200kHz, 12-Bit Sampling A/D Converter
T
= 25°C
10
1
NORMAL CONVERSION
3V
NAP MODE
BETWEEN CONVERSION
1
8
V
SHDN
CC
+
10µF
0.1µF
MPU
P1.4
LTC1401
0.1
0.01
2
7
ANALOG INPUT
(0V TO 2.048V)
A
V
CONV
CLK
IN
SHUTDOWN MODE
BETWEEN CONVERSION
3
4
6
5
1.20V
P1.3
REF
+
SLEEP MODE BETWEEN
CONVERSION
GND
D
P1.2
10µF
0.1µF
OUT
SERIAL
DATA LINK
0.001
1401 TA01
100
SAMPLE RATE (Hz)
0.01 0.1
1
10
1k 10k 100k 1M
LTC1401 • TA02
1