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LTC1419
14-Bit, 800ksps Sampling
A/D Converter with Shutdown
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Sample Rate: 800ksps
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Power Dissipation: 150mW
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81.5dB S/(N + D) and 93dB THD
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No Missing Codes
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No Pipeline Delay
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Nap and Sleep Shutdown Modes
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Operates with 2.5V Internal 15ppm/°C
Reference or External Reference
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True Differential Inputs Reject Common Mode Noise
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20MHz Full-Power Bandwidth Sampling
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Bipolar Input Range: ±2.5V
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28-Pin SSOP and SO Packages
D
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ESCRIPTIO
The LTC
®
1419 is a 1µs, 800ksps, 14-bit sampling
A/D converter that draws only 150mW from ±5V supplies.
This easy-to-use device includes a high dynamic range
sample-and-hold and a precision reference. Two digitally
selectable power shutdown modes provide flexibility for
low power systems.
The LTC1419 has a full-scale input range of ±2.5V. Out-
standing AC performance includes 81.5dB S/(N + D) and
93dB THD with a 100kHz input; 80dB S/(N + D) and 86dB
THD at the Nyquist input frequency of 400kHz.
The unique differential input sample-and-hold can acquire
single-ended or differential input signals up to its 20MHz
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 data ready signal (BUSY)
ease connections to FIFOs, DSPs and microprocessors.
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Telecommunications
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Digital Signal Processing
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Multiplexed Data Acquisition Systems
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High Speed Data Acquisition
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Spectrum Analysis
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Imaging Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
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+A
IN
–A
IN
V
REF
REFCOMP
AGND
D13(MSB)
D12
D11
D10
D9
D8
D7
D6
DGND
AV
DD
DV
DD
V
SS
BUSY
CS
CONVST
RD
SHDN
D0
D1
D2
D3
D4
D5
LTC1419
10µF
1µF
DIFFERENTIAL
ANALOG INPUT
(–2.5V TO 2.5V)
10µF
10µF
–5V
5V
14-BIT
PARALLEL
BUS
µP CONTROL
LINES
1419 TA01
V
REF
OUTPUT
2.50V
800kHz, 14-Bit Sampling A/D Converter
INPUT FREQUENCY (Hz)
EFFECTIVE BITS
S/(N + D) (dB)
10k 100k 1M 2M
1419 TA02
1k
14
13
12
11
10
9
8
7
6
5
4
3
2
86
80
74
68
62
f
SAMPLE
= 800kHz
Effective Bits and Signal-to-(Noise + Distortion)
vs Input Frequency
