
1
LTC1404
1404fa
VCC
AIN
VREF
GND
VSS
CONV
CLK
DOUT
MPU
P1.4
P1.3
P1.2
LTC1404
+
0.1
F
10
F
+
0.1
F
10
F*
*AVX TPSD106M035R0300
REFOUT
2.43V
ANALOG INPUT
(0V TO 4.096V)
SERIAL
DATA LINK
5V
LTC1404 TA01
TYPICAL APPLICATIO
U
APPLICATIO S
U
DESCRIPTIO
U
FEATURES
Power Consumption vs Sample Rate
Single 5V Supply, 600kHz, 12-Bit Sampling A/D Converter
The LTC
1404 is a complete 600ksps, 12-bit A/D con-
verter which draws only 75mW from 5V or
± 5V supplies.
This easy-to-use device comes complete with a 160ns
sample-and-hold and a precision reference. Unipolar and
bipolar conversion modes add to the flexibility of the ADC.
The LTC1404 has two power saving modes: Nap and
Sleep. In Nap mode, it consumes only 7.5mW of power
and can wake up and convert immediately. In the Sleep
mode, it consumes 60
W 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 LTC1404 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 full-scale drift over temperature.
Guaranteed AC performance includes 69dB S/(N + D)
and – 76dB THD at an input frequency of 100kHz over
temperature.
The 3-wire serial port allows compact and efficient data
transfertoawiderangeofmicroprocessors,microcontrollers
and DSPs.
■ Complete 12-Bit ADC in SO-8
■
Single Supply 5V or
±5V Operation
■ Sample Rate: 600ksps
■ Power Dissipation: 75mW (Typ)
■
72dB S/(N + D) and – 80dB THD at Nyquist
■ No Missing Codes over Temperature
■ Nap Mode with Instant Wake-Up: 7.5mW
■
Sleep Mode: 60
W
■ High Impedance Analog Input
■ Input Range (1mV/LSB): 0V to 4.096V or
± 2.048V
■
Internal Reference Can Be Overdriven Externally
■ 3-Wire Interface to DSPs and Processors (SPI and
MICROWIRE
TM Compatible)
■ High Speed Data Acquisition
■ Digital Signal Processing
■ Multiplexed Data Acquisition Systems
■ Audio and Telecom Processing
■ Digital Radio
■ Spectrum Analysis
■ Low Power and Battery-Operated Systems
■ Handheld or Portable Instruments
SAMPLE RATE (Hz)
0.01
SUPPLY
CURRENT
(mA)
100
10
1
0.1
0.01
0.001
10
1k
1M
LTC1404 TA02
0.1
1
100
10k 100k
NORMAL CONVERSION
9.6MHz CLOCK
SLEEP MODE
BETWEEN CONVERSION
NAP MODE
BETWEEN CONVERSION
Complete SO-8, 12-Bit,
600ksps ADC with Shutdown
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.