LTC1419_1 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
■ _{Sample Rate: 800ksps}
■ _{Power Dissipation: 150mW}
■ _{81.5dB S/(N + D) and 93dB THD}
■ _{No Missing Codes}
■ _{No Pipeline Delay}
■ _{Nap and Sleep Shutdown Modes}
■ _{Operates with 2.5V Internal 15ppm/°C}
Reference or External Reference
■ _{True Differential Inputs Reject Common Mode Noise}
■ _{20MHz Full-Power Bandwidth Sampling}
■ _{Bipolar Input Range: ±2.5V}
■ _{28-Pin SSOP and SO Packages}
U
APPLICATIO S
■ _{Telecommunications}
■ _{Digital Signal Processing}
■ _{Multiplexed Data Acquisition Systems}
■ _{High Speed Data Acquisition}
■ _{Spectrum Analysis}
■ _{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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 5581252.
TYPICAL APPLICATIO
V_REF
OUTPUT
2.50V
1µF
800kHz, 14-Bit Sampling A/D Converter
LTC1419
5V
DIFFERENTIAL ₁
28
ANALOG INPUT
(–2.5V TO 2.5V)
2
3
+A_IN
–A_IN
4 ^VREF
REFCOMP
AV_{DD 27}
DV_{DD 26}
V_{SS 25}
BUSY
–5V
10µF
10µF
5
24
10µF
AGND
CS
6
D13(MSB)
7
23
CONVST
22
µP CONTROL
LINES
D12
RD
8
21
D11
SHDN
9
20
D10
D0
10
19
D9
D1
14-BIT
PARALLEL
11
D8
12
18
D2
17
BUS
D7
D3
13
16
D6
D4
14
15
DGND
D5
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
1419 TA01
1419fb
1