LTC1404 Datasheet, PDF (1/24 Pages) Linear Technology – Complete SO-8, 12-Bit, 600ksps ADC with Shutdown

FEATURES
s _{Complete 12-Bit ADC in SO-8}
s _{Single Supply 5V or ±5V Operation}
s _{Sample Rate: 600ksps}
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: 7.5mW}
s _{Sleep Mode: 60µW}
s _{High Impedance Analog Input}
s _{Input Range (1mV/LSB): 0V to 4.096V 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}
TYPICAL APPLICATION
Single 5V Supply, 600kHz, 12-Bit Sampling A/D Converter
5V
+
10µF*
ANALOG INPUT
(0V TO 4.096V)
REF_OUT
2.43V ₊
10µF
1
V_CC
8
V_SS
0.1µF
LTC1404
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
*AVX TPSD106M035R0300
LTC1404 • TA01
LTC1404
Complete SO-8, 12-Bit,
600ksps ADC with Shutdown
DESCRIPTION
The LTC ^®1404 is a complete 600ksps, 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 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 60µW 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
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.
Power Consumption vs Sample Rate
100
NORMAL CONVERSION
10
NAP MODE
BETWEEN CONVERSION
1
0.1
SLEEP MODE
BETWEEN CONVERSION
0.01
0.001
0.01 0.1
9.6MHz CLOCK
1 10 100 1k 10k 100k 1M
SAMPLE RATE (Hz)
LTC1404 • TA02
1