LTC1282 Datasheet, PDF (1/24 Pages) Linear Technology – 3V 140ksps 12-Bit Sampling A/D Converter with Reference

FEATURES
s _{Single Supply 3V or ±3V Operation}
s _{140ksps Throughput Rate}
s _{12mW (Typ) Power Dissipation}
s _{On-Chip 25ppm/°C Reference}
s _{Internal Synchronized Clock; No Clock Required}
s _{High Impedance Analog Input}
s _{69dB S/(N + D) and 77dB THD at Nyquist}
s _{±0.5LSB INL and ±0.75LSB DNL Max (A Grade)}
s _{2.7V Guaranteed Minimum Supply Voltage}
s _{ESD Protected On All Pins}
s _{24-Pin Narrow PDIP and SW Packages}
s _{0V to 2.5V or ±1.25V Input Ranges}
APPLICATI S
s _{3V Powered Systems}
s _{High Speed Data Acquisition}
s _{Digital Signal Processing}
s _{Multiplexed Data Acquisition Systems}
s _{Audio and Telecom Processing}
s _{Spectrum Analysis}
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTBiCMOS is a trademark of Linear Technology Corporation
LTC1282
3V 140ksps 12-Bit
Sampling A/D Converter
with Reference
DESCRIPTIO
The LTC^®1282 is a 6µs, 140ksps, sampling 12-bit A/D
converter that draws only 12mW from a single 3V or dual
±3V supply. This easy-to-use device comes complete with
1.14µs sample-and-hold, precision reference and inter-
nally trimmed clock. Unipolar and bipolar conversion
modes provide flexibility for various applications. They are
built with LTBiCMOS^TM switched capacitor technology.
The LTC1282 has a 25ppm/°C (max) internal reference
and converts 0V to 2.5V unipolar inputs from a single 3V
supply. With ±3V supplies its input range is ±1.25V with
two’s complement output format. Maximum DC specifica-
tions include ±0.5LSB INL, ±0.75LSB DNL and 25ppm/°C
full-scale drift over temperature. Outstanding AC perfor-
mance includes 69dB S/(N + D) and 77dB THD at the
Nyquist input frequency of 70kHz.
The internal clock is trimmed for 6µs 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 APPLICATI
Single 3V Supply, 140ksps, 12-Bit Sampling A/D Converter
1.20V
V_REF
OUTPUT
+
10µF
LTC1282
ANALOG INPUT
(0V TO 2.5V)
1
2
A_IN
24
V_{DD 23}
3 ^VREF
V_{SS 22}
0.1µF
AGND BUSY
4
21
D11(MSB) CS
5
20
D10
RD
6
19
D9
HBEN
7
18
D8
NC
8
17
D7
NC
9
16
D6
D0/8
8- OR 12-BIT
PARALLEL BUS
10
D5
11
15
D1/9
14
D4
D2/10
12
13
DGND D3/11
3V
+
10µF
0.1µF
µP CONTROL
LINES
1282 TA01
Effective Bits and Signal-to-(Noise + Distortion)
vs Input Frequency
12
74
11
68
10
62
9
NYQUIST
FREQUENCY
56
8
50
7
6
5
4
3
2
1 _{fSAMPLE = 140kHz}
0
1k
10k
INPUT FREQUENCY (Hz)
100k
LTC1282 • TA02
1