LTC1418 Datasheet, PDF (1/28 Pages) Linear Technology – Low Power, 14-Bit, 200ksps ADC with Serial and Parallel I/O

LTC1418
Low Power, 14-Bit, 200ksps
ADC with Serial and Parallel I/O
FEATURES
s _{Single Supply 5V or ± 5V Operation}
s _{Sample Rate: 200ksps}
s _{±1.25LSB INL and ±1LSB DNL Max}
s _{Power Dissipation: 15mW (Typ)}
s _{Parallel or Serial Data Output}
s _{No Missing Codes Over Temperature}
s _{Power Shutdown: Nap and Sleep}
s _{External or Internal Reference}
s _{Differential High Impedance Analog Input}
s _{Input Range: 0V to 4.096V or ±2.048V}
s _{81.5dB S/(N + D) and – 94dB THD at Nyquist}
s _{28-Pin Narrow PDIP and SSOP Packages}
U
APPLICATIONS
s _{Remote Data Acquisition}
s _{Battery Operated Systems}
s _{Digital Signal Processing}
s _{Isolated Data Acquisition Systems}
s _{Audio and Telecom Processing}
s _{Medical Instrumentation}
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.
TYPICAL APPLICATION
Low Power, 200kHz, 14-Bit Sampling A/D Converter
5V
A_IN+
A_IN–
REFCOMP
10µF
V_REF
1µF
LTC1418
10µF
V_DD
S/H
14-BIT ADC
4.096V
BUFFER
14 _SELECTABLE
SERIAL/
PARALLEL
PORT
8k
2.5V
REFERENCE
TIMING AND
LOGIC
AGND
V_SS
(0V OR – 5V)
DGND
SER/PAR
D13
D5
D4 (EXTCLKIN)
D3 (SCLK)
D2 (CLKOUT)
D1 (D_OUT)
D0 (EXT/INT)
BUSY
CS
RD
CONVST
SHDN
1418 TA01
Typical INL Curve
1.0
0.5
0
–0.5
–1.0
0
4096
8192
12288
OUTPUT CODE
16384
1418 TA02
1