1
LTC1273
LTC1275/LTC1276
127356fa
■
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)
Effective Bits and Signal to (Noise + Distortion)
vs Input Frequency
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
A
IN
V
REF
AGND
D11
D10
D9
D8
D7
D6
D5
D4
DGND
V
DD
NC
BUSY
CS
RD
HBEN
NC
NC
D0/8
D1/9
D2/10
D3/11
LTC1273
+
0.1µF
10µF
2.42V
V
REF
OUTPUT
ANALOG INPUT
(0V TO 5V)
+
10µF
0.1µF
5V
8- OR 12-BIT
PARALLEL BUS
µP CONTROL
LINES
LTC1273/75/76 • TA01
INPUT FREQUENCY (Hz)
10k
0
EFFECTIVE BITS
3
5
7
10
100k 2M
LTC1273/75/76 • TA02
1
4
6
9
12
11
8
2
1M
62
56
74
68
50
S/(N + D) (dB)
f
SAMPLE
= 300kHz
NYQUIST
FREQUENCY
■
High Speed Data Acquisition
■
Digital Signal Processing
■
Multiplexed Data Acquisition Systems
■
Audio and Telecom Processing
■
Spectrum Analysis
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 LTBiCMOS
TM
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.
12-Bit, 300ksps Sampling
A/D Converters with Reference
Single 5V Supply, 300ksps, 12-Bit Sampling A/D Converter
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
, 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.
