LTC1416 Datasheet, PDF (1/20 Pages) Linear Technology – Low Power 14-Bit, 400ksps Sampling ADC

LTC1416
Low Power 14-Bit, 400ksps
Sampling ADC
FEATURES
s _{Sample Rate: 400ksps}
s _{Power Dissipation: 70mW}
s _{Guaranteed ±1.5LSB DNL, ± 2LSB INL (Max)}
s _{80.5dB S/(N + D) and 93dB THD at 100kHz}
s _{80dB S/(N + D) and 90dB THD at Nyquist}
s _{Nap and Sleep Shutdown Modes}
s _{Operates with Internal or External Reference}
s _{True Differential Inputs Reject Common Mode Noise}
s _{15MHz Full Power Bandwidth Sampling}
s _{±2.5V Bipolar Input Range}
s _{28-Pin SSOP Package}
APPLICATI S
s _{Telecommunications}
s _{Digital Signal Processing}
s _{Multiplexed Data Acquisition Systems}
s _{High Speed Data Acquisition}
s _{Spectrum Analysis}
s _{Imaging Systems}
, LTC and LT are registered trademarks of Linear Technology Corporation.
DESCRIPTIO
The LTC^®1416 is a 2.2µs, 400ksps, 14-bit sampling A/D
converter that draws only 70mW from ±5V supplies. This
easy-to-use device includes a high dynamic range sample-
and-hold and a precision reference. Two digitally select-
able power shutdown modes provide flexibility for low
power systems.
The LTC1416’s full-scale input range is ±2.5V. Maximum
DC specifications include ±2LSB INL, ±1.5LSB DNL over
temperature. Outstanding AC performance includes 80.5dB
S/(N + D) and 93dB THD with a 100kHz input, and 80dB
S/(N + D) and 90dB THD at the Nyquist input frequency of
200kHz.
The unique differential input sample-and-hold can ac-
quire single-ended or differential input signals up to its
15MHz bandwidth. The 60dB common mode rejection
allows users to eliminate ground loops and common
mode noise by measuring signals differentially from the
source.
The ADC has a µP compatible, 14-bit parallel output port.
There is no pipeline delay in the conversion results. A
separate convert start input and a data ready signal
(BUSY) ease connections to FIFOs, DSPs and micropro-
cessors.
TYPICAL APPLICATI
Complete, 70mW, 14-Bit ADC with 80.5dB S/(N + D)
10µF
A_IN+
A_IN–
REFCOMP
22µF
V_REF
1µF
AV_DD
DV_DD
14
S/H
14-BIT ADC
LTC1416
OUTPUT
BUFFERS
•••
D13 (MSB)
D0 (LSB)
BUFFER
4k
2.5V
REFERENCE
TIMING
AND
LOGIC
V_SS
10µF –5V
AGND
DGND
BUSY
CS
CONVST
RD
SHDN
1416 TA01
Effective Bits and
Signal-to-(Noise + Distortion)
vs Input Frequency
14
13
12
11
NYQUIST
10
FREQUENCY
9
8
7
6
5
4
3
2
1 fSAMPLE = 400kHz
0
1k
10k
100k
INPUT FREQUENCY (Hz)
86
80
74
68
62
1M 2M
1416 TA02
1