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LTC1275BC Datasheet

  • LTC1275BC

  • 12-Bit, 300ksps Sampling A/D Converters with Reference

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LTC1273
LTC1275/LTC1276
12-Bit, 300ksps Sampling
A/D Converters with Reference
FEATURES
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Single Supply 5V or
鹵5V
Operation
300ksps Sample Rate
75mW (Typ) Power Dissipation
On-Chip 25ppm/擄C Reference
Internal Synchronized Clock; No Clock Required
High Impedance Analog Input
70dB S/(N + D) and 77dB THD at Nyquist
鹵1/2LSB
INL and
鹵3/4LSB
DNL Max (A Grade)
ESD Protected On All Pins
24-Pin Narrow DIP and SOL Packages
Variety of Input Ranges:
0V to 5V (LTC1273)
鹵2.5V
(LTC1275)
鹵5V
(LTC1276)
The LTC1273/LTC1275/LTC1276 are 300ksps, sampling
12-bit A/D converters that draw only 75mW from single
5V or
鹵5V
supplies. These easy-to-use devices come
complete with 600ns sample-and-holds, precision refer-
ences and internally trimmed clocks. Unipolar and bipo-
lar conversion modes provide flexibility for various appli-
cations. They are built with LTBiCMOS
TM
switched ca-
pacitor technology.
These devices have 25ppm/擄C (max) internal references.
The LTC1273 converts 0V to 5V unipolar inputs from a
single 5V supply. The LTC1275/LTC1276 convert
鹵2.5V
and
鹵5V
respectively from
鹵5V
supplies. Maximum DC
specifications include
鹵1/2LSB
INL,
鹵3/4LSB
DNL and
25ppm/擄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 2.7碌s 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.
LTBiCMOS
TM
is a trademark of Linear Technology Corporation
APPLICATI
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High Speed Data Acquisition
Digital Signal Processing
Multiplexed Data Acquisition Systems
Audio and Telecom Processing
Spectrum Analysis
TYPICAL APPLICATI
2.42V
V
REF
OUTPUT
Single 5V Supply, 300ksps, 12-Bit Sampling A/D Converter
LTC1273
1
ANALOG INPUT
V
DD
A
(0V TO 5V) 2
IN
V
REF
NC
3
BUSY
AGND
0.1碌F
4
CS
D11
5
RD
D10
6
HBEN
D9
7
NC
D8
8
NC
D7
9
D0/8
D6
10
8- OR 12-BIT
D1/9
D5
PARALLEL BUS
11
D2/10
D4
12
D3/11
DGND
5V
24
23
22
21
20
19
18
17
16
15
14
13
Effective Bits and Signal to (Noise + Distortion)
vs Input Frequency
12
11
0.1碌F
+
10碌F
碌P
CONTROL
LINES
+
10碌F
10
9
EFFECTIVE BITS
8
7
6
5
4
3
2
1
0
10k
f
SAMPLE
= 300kHz
100k
INPUT FREQUENCY (Hz)
1M
LTC1273/75/76 鈥?TA01
U
74
68
NYQUIST
FREQUENCY
62
56
50
S/(N + D) (dB)
UO
UO
2M
LTC1273/75/76 鈥?TA02
1

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