LTC1273 Ver la hoja de datos (PDF) - Linear Technology
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LTC1273 Datasheet PDF : 24 Pages
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FEATURES
■ Single Supply 5V or ±5V Operation
■ 300ksps Sample Rate
■ 75mW (Typ) Power Dissipation
■ On-Chip 25ppm/°C Reference
■ Internal Synchronized Clock; No Clock Required
■ High Impedance Analog Input
■ 70dB S/(N + D) and 77dB THD at Nyquist
■ ±1/2LSB INL and ±3/4LSB DNL Max (A Grade)
■ ESD Protected On All Pins
■ 24-Pin Narrow PDIP and SW Packages
■ Variety of Input Ranges:
0V to 5V (LTC1273)
±2.5V (LTC1275)
±
5V
(LTC1276)
U
APPLICATIO S
■ High Speed Data Acquisition
■ Digital Signal Processing
■ Multiplexed Data Acquisition Systems
■ Audio and Telecom Processing
■ Spectrum Analysis
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
LTBiCMOS is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LTC1273
LTC1275/LTC1276
12-Bit, 300ksps Sampling
A/D Converters with Reference
DESCRIPTIO
The LTC®1273/LTC1275/LTC1276 are 300ksps, sam-
pling 12-bit A/D converters that draw only 75mW from
single 5V or ±5V supplies. These easy-to-use devices
come complete with 600ns sample-and-holds, precision
references and internally trimmed clocks. Unipolar and
bipolar conversion modes provide flexibility for various
applications. They are built with LTBiCMOSTM switched
capacitor technology.
These devices have 25ppm/°C (max) internal references.
The LTC1273 converts 0V to 5V unipolar inputs from a
single 5V supply. The LTC1275/LTC1276 convert ±2.5V
and ±5V respectively from ±5V supplies. Maximum DC
specifications include ±1/2LSB INL, ±3/4LSB DNL and
25ppm/°C full scale drift over temperature. Outstanding
AC performance includes 70dB S/(N + D) and 77dB THD
at the Nyquist input frequency of 150kHz.
The internal clock is trimmed for 2.7µs maximum conver-
sion time. The clock automatically synchronizes to each
sample command eliminating problems with asynchro-
nous clock noise found in competitive devices. A high
speed parallel interface eases connections to FIFOs, DSPs
and microprocessors.
TYPICAL APPLICATIO
Single 5V Supply, 300ksps, 12-Bit Sampling A/D Converter
2.42V
VREF
OUTPUT
+
10µF
LTC1273
ANALOG INPUT 1
(0V TO 5V) 2
3
0.1µF
4
5
6
7
8
9
8- OR 12-BIT 10
PARALLEL BUS 11
12
AIN
VREF
AGND
D11
D10
D9
D8
D7
D6
D5
D4
DGND
24
VDD 23
NC
22
BUSY
21
CS
20
RD
19
HBEN
18
NC
17
NC
16
D0/8
15
D1/9
14
D2/10
13
D3/11
5V
+
10µF
0.1µF
µP CONTROL
LINES
LTC1273/75/76 • TA01
Effective Bits and Signal to (Noise + Distortion)
vs Input Frequency
12
74
11
68
10
NYQUIST
62
9
FREQUENCY
56
8
50
7
6
5
4
3
2
1 fSAMPLE = 300kHz
0
10k
100k
INPUT FREQUENCY (Hz)
1M 2M
LTC1273/75/76 • TA02
127356fa
1
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