LTC1417
Low Power 14-Bit, 400ksps
Sampling ADC Converter
with Serial I/O
U
FEATURES
DESCRIPTIO
The LTC®1417 is a low power, 400ksps, 14-bit A/D con-
verter. This versatile device can operate from a single 5V or
±5V supplies. An onboard high performance sample-and-
hold, a precision reference and internal trimming minimize
external circuitry requirements. The low 20mW power
dissipation is made even more attractive with two user-
selectable power shutdown modes.
■
16-Pin Narrow SSOP Package (SO-8 Footprint)
■
Sample Rate: 400ksps
■
±1.25LSB INL and ±1LSB DNL Max
■
Power Dissipation: 20mW (Typ)
■
Single Supply 5V or ±5V Operation
■
Serial Data Output
■
No Missing Codes Over Temperature
■
Power Shutdown: Nap and Sleep
The LTC1417 converts 0V to 4.096V unipolar inputs when
using a 5V supply and ±2.048V bipolar inputs when using
±5V supplies. DC specs include ±1.25LSB INL, ±1LSB
DNLandnomissingcodesovertemperature. Outstanding
AC performance includes 81dB S/(N + D) and 95dB THD
at a Nyquist input frequency of 200kHz.
■
External or Internal Reference
■
Differential High Impedance Analog Input
■
Input Range: 0V to 4.096V or ±2.048V
■
81dB S/(N + D) and –95dB THD at Nyquist
U
APPLICATIO S
The internal clock is trimmed for 2µs maximum conver-
sion time. A separate convert start input and a data ready
signal (BUSY) ease connections to FIFOs, DSPs and
microprocessors.
■
High Speed Data Acquisition
■
Digital Signal Processing
■
Isolated Data Acquisition Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Audio and Telecom Processing
■
Spectrum Instrumentation
U
W
EQUIVALE T BLOCK DIAGRA
A 400kHz, 14-Bit Sampling A/D Converter in a Narrow 16-Lead SSOP Package
5V
Effective Bits and Signal-to-(Noise + Distortion)
vs Input Frequency
10µF
16
V
DD
14
12
10
8
86
80
74
68
62
LTC1417
S/H
1
2
+
A
A
IN
6
7
8
9
14
14-BIT ADC
EXTCLKIN
SCLK
CLKOUT
–
IN
SERIAL
PORT
D
OUT
4.096V
BUFFER
4
3
REFCOMP
10µF
6
14
12
13
11
BUSY
RD
CONVST
SHDN
4
8k
TIMING AND
LOGIC
2.5V
REFERENCE
V
REF
2
1µF
1k
10k
100k
1M
1417 TA01
INPUT FREQUENCY (Hz)
5
AGND
15
V
10 DGND
SS
(0V OR –5V)
1417 TA02
1