LTC1419 Datasheet, PDF (1/20 Pages) Linear Technology – 14-Bit, 800ksps Sampling A/D Converter with Shutdown

LTC1419
14-Bit, 800ksps Sampling
A/D Converter with Shutdown
FEATURES
s _{Sample Rate: 800ksps}
s _{Power Dissipation: 150mW}
s _{81.5dB S/(N + D) and 93dB THD}
s _{No Missing Codes}
s _{No Pipeline Delay}
s _{Nap and Sleep Shutdown Modes}
s _{Operates with 2.5V Internal 15ppm/°C}
Reference or External Reference
s _{True Differential Inputs Reject Common Mode Noise}
s _{20MHz Full-Power Bandwidth Sampling}
s _{Bipolar Input Range: ±2.5V}
s _{28-Pin SSOP and SO Packages}
APPLICATI S
s _{Telecommunications}
s _{Digital Signal Processing}
s _{Multiplexed Data Acquisition Systems}
s _{High Speed Data Acquisition}
s _{Spectrum Analysis}
s _{Imaging Systems}
DESCRIPTIO
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATI
V_REF
OUTPUT
2.50V
1µF
800kHz, 14-Bit Sampling A/D Converter
LTC1419
DIFFERENTIAL ¹
ANALOG INPUT
(–2.5V TO 2.5V)
2
3
4
10µF
5
6
7
8
9
10
11
14-BIT
PARALLEL ¹²
BUS 13
14
+A_IN
–A_IN
V_REF
REFCOMP
AGND
D13(MSB)
D12
D11
D10
D9
D8
D7
D6
DGND
28
AV_{DD 27}
DV_{DD 26}
V_{SS 25}
BUSY
24
CS
23
CONVST
22
RD
21
SHDN
20
D0
19
D1
18
D2
17
D3
16
D4
15
D5
5V
– 5V
10µF
µP CONTROL
LINES
10µF
1419 TA01
Effective Bits and Signal-to-(Noise + Distortion)
vs Input Frequency
14
13
12
11
10
9
8
7
6
5
4
3 _{fSAMPLE = 800kHz}
2
1k
10k
100k
INPUT FREQUENCY (Hz)
86
80
74
68
62
1M 2M
1419 TA02
1