LTC1404
Complete SO-8, 12-Bit,
600ksps ADC with Shutdown
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FEATURES
DESCRIPTION
The LTC®1404 is a complete 600ksps, 12-bit A/D con-
verterwhichdrawsonly75mWfroma5Vor± 5Vsupplies.
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, itconsumes60µWofpowertypically. Uponpower-
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.
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Complete 12-Bit ADC in SO-8
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Single Supply 5V or ±5V Operation
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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: 60µW
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
MICROWIRETM Compatible)
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.
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APPLICATIONS
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High Speed Data Acquisition
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Digital Signal Processing
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Multiplexed Data Acquisition Systems
Audio and Telecom Processing
Digital Radio
Spectrum Analysis
Low Power and Battery-Operated Systems
Handheld or Portable Instruments
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The 3-wire serial port allows compact and efficient data
transfertoawiderangeofmicroprocessors,microcontrollers
and DSPs.
, LTC and LT are registered trademarks of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corp.
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TYPICAL APPLICATION
Power Consumption vs Sample Rate
Single 5V Supply, 600kHz, 12-Bit Sampling A/D Converter
100
5V
NORMAL CONVERSION
1
8
V
CC
V
SS
10
+
NAP MODE
10µF*
0.1µF
BETWEEN CONVERSION
MPU
P1.4
LTC1404
1
2
7
ANALOG INPUT
(0V TO 4.096V)
A
V
CONV
CLK
IN
SLEEP MODE
BETWEEN CONVERSION
3
4
6
5
REF
2.43V
10µF
OUT
0.1
P1.3
P1.2
REF
+
GND
D
0.1µF
OUT
SERIAL
DATA LINK
0.01
9.6MHz CLOCK
*AVX TPSD106M035R0300
LTC1404 • TA01
0.001
0.01 0.1
100
SAMPLE RATE (Hz)
1
10
1k 10k 100k 1M
LTC1404 • TA02
1