LTC1400 Datasheet, PDF (1/20 Pages) Linear Technology – Complete SO-8, 12-Bit, 400ksps ADC with Shutdown

LTC1400
Complete SO-8, 12-Bit,
400ksps ADC with Shutdown
FEATURES
s _{Complete 12-Bit ADC in SO-8}
s _{Single Supply 5V or ±5V Operation}
s _{Sample Rate: 400ksps}
s _{Power Dissipation: 75mW (Typ)}
s _{72dB S/(N + D) and – 80dB THD at Nyquist}
s _{No Missing Codes over Temperature}
s _{Nap Mode with Instant Wake-Up: 6mW}
s _{Sleep Mode: 30µW}
s _{High Impedance Analog Input}
s _{Input Range (1mV/LSB): 0V to 4.096 or ± 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 _{High Speed Data Acquisition}
s _{Digital Signal Processing}
s _{Multiplexed Data Acquisition Systems}
s _{Audio and Telecom Processing}
s _{Digital Radio}
s _{Spectrum Analysis}
s _{Low Power and Battery-Operated Systems}
s _{Handheld or Portable Instruments}
DESCRIPTION
The LTC ^®1400 is a complete 400ksps, 12-bit A/D con-
verter which draws only 75mW from a 5V or ± 5V supplies.
This easy-to-use device comes complete with a 200ns
sample-and-hold and a precision reference. Unipolar and
bipolar conversion modes add to the flexibility of the ADC.
The LTC1400 has two power saving modes: Nap and
Sleep. In Nap mode, it consumes only 6mW of power and
can wake up and convert immediately. In the Sleep mode,
it consumes 30µW of power typically. Upon power-up
from Sleep mode, a reference ready (REFRDY) signal is
available in the serial data word to indicate that the
reference has settled and the chip is ready to convert.
The LTC1400 converts 0V to 4.096V unipolar inputs from
a single 5V supply and ±2.048V bipolar inputs from ±5V
supplies. Maximum DC specs include ±1LSB INL, ±1LSB
DNL and 45ppm/°C drift over temperature. Guaranteed AC
performance includes 70dB S/(N + D) and – 76dB THD at
an input frequency of 100kHz, over temperature.
The 3-wire serial port allows compact and efficient data
transfer to a wide range of microprocessors, microcontrollers
and DSPs.
, LTC and LT are registered trademarks of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corp.
TYPICAL APPLICATION
Single 5V Supply, 400kHz, 12-Bit Sampling A/D Converter
5V
+
10µF
ANALOG INPUT
(0V TO 4.096V)
2.42V REF_{OUT +}
10µF
1
V_CC
8
V_SS
0.1µF
LTC1400
MPU
2
7
A_IN
CONV
P1.4
3 _VREF
4
0.1µF GND
6
CLK
P1.3
5
D_OUT
P1.2
SERIAL
DATA LINK
LTC1400 • TA01
Power Consumption vs Sample Rate
100
NORMAL CONVERSION
10
NAP MODE
BETWEEN CONVERSION
1
0.1
0.01
0.001
0.01 0.1
SLEEP AND NAP MODE
BETWEEN CONVERSION
SLEEP MODE BETWEEN
CONVERSION
6.4MHz CLOCK
1 10 100 1k 10k 100k 1M
SAMPLE RATE (Hz)
LTC1400 • TA02
1