LTC1418
Low Power, 14-Bit, 200ksps
ADC with Serial and Parallel I/O
FEATURES
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DESCRIPTION
The LTC
®
1418 is a low power, 200ksps, 14-bit A/D
converter. Data output is selectable for 14-bit parallel or
serial format. This versatile device can operate from a
single 5V or
±5V
supply. An onboard high performance
sample-and-hold, a precision reference and internal tim-
ing minimize external circuitry requirements. The low
15mW power dissipation is made even more attractive
with two user selectable power shutdown modes.
The LTC1418 converts 0V to 4.096V unipolar inputs from
a single 5V supply and
±2.048V
bipolar inputs from
±5V
supplies. DC specs include
±1.25LSB
INL,
±1LSB
DNL
and no missing codes over temperature. Outstanding AC
performance includes 82dB S/(N + D) and 94dB THD at the
Nyquist input frequency of 100kHz.
The flexible output format allows either parallel or serial I/O.
The SPI/MICROWIRE
TM
compatible serial I/O port can oper-
ate as either master or slave and can support clock frequen-
cies from DC to 10MHz. A separate convert start input and
a data ready signal (BUSY) allow easy control of conversion
start and data transfer.
, LTC and LT are registered trademarks of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
Single Supply 5V or
±5V
Operation
Sample Rate: 200ksps
±1.25LSB
INL and
±1LSB
DNL Max
Power Dissipation: 15mW (Typ)
Parallel or Serial Data Output
No Missing Codes Over Temperature
Power Shutdown: Nap and Sleep
External or Internal Reference
Differential High Impedance Analog Input
Input Range: 0V to 4.096V or
±2.048V
81.5dB S/(N + D) and – 94dB THD at Nyquist
28-Pin Narrow PDIP and SSOP Packages
APPLICATIONS
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Remote Data Acquisition
Battery Operated Systems
Digital Signal Processing
Isolated Data Acquisition Systems
Audio and Telecom Processing
Medical Instrumentation
TYPICAL APPLICATION
Low Power, 200kHz, 14-Bit Sampling A/D Converter
5V
10µF
V
DD
LTC1418
A
IN+
S/H
A
IN
–
SER/PAR
D13
14-BIT ADC
14
SELECTABLE
SERIAL/
PARALLEL
PORT
D5
D4 (EXTCLKIN)
D3 (SCLK)
D2 (CLKOUT)
D1 (D
OUT
)
D0 (EXT/INT)
BUSY
CS
RD
CONVST
SHDN
1.0
0.5
INL (LSBs)
4.096V
REFCOMP
10µF
BUFFER
–0.5
8k
V
REF
1µF
AGND
V
SS
(0V OR – 5V)
DGND
1418 TA02
1418 TA01
2.5V
REFERENCE
TIMING AND
LOGIC
–1.0
0
4096
8192
OUTPUT CODE
12288
16384
U
0
U
U
Typical INL Curve
1
LINER [ LINEAR TECHNOLOGY ]
