LTC1275_15 Datasheet, PDF (1/24 Pages) Linear Technology – 12-Bit, 300ksps Sampling A/D Converters with Reference

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 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.
TYPICAL APPLICATIO
Single 5V Supply, 300ksps, 12-Bit Sampling A/D Converter
2.42V
V_REF
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
A_IN
V_REF
AGND
D11
D10
D9
D8
D7
D6
D5
D4
DGND
24
V_{DD 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