LTC1279 Datasheet, PDF (1/16 Pages) Linear Technology – 12-Bit, 600ksps Sampling A/D Converter with Shutdown

LTC1279
12-Bit, 600ksps Sampling
A/D Converter with Shutdown
FEATURES
s _{Single Supply 5V or ±5V Operation}
s _{Sample Rate: 600ksps}
s _{70dB S/(N + D) and 74dB THD at Nyquist}
s _{Power Dissipation: 60mW Typ}
s _{Power Shutdown with Instant Wake-Up}
s _{Internal Reference Can Be Overdriven Externally}
s _{Internal Synchronized Clock; No Clock Required}
s _{High Impedance Analog Input}
s _{Input Range: 0V to 5V or ±2.5V}
s _{New Flexible, Friendly Parallel Interface Eases}
Connections to DSPs and FIFOs
s _{24-Pin SO Wide Package}
APPLICATI S
s _{High Speed Data Acquisition}
s _{Digital Signal Processing}
s _{Multiplexed Data Acquisition Systems}
s _{Audio and Telecom Processing}
s _{Spectrum Analysis}
DESCRIPTIO
The LTC^®1279 is a 1.4µs, 600ksps, sampling 12-bit A/D
converter which draws only 60mW from a single 5V or
±5V supplies. This easy-to-use device comes complete
with a 160ns sample-and-hold, a precision reference and
an internally trimmed clock. Unipolar and bipolar conver-
sion modes add to the flexibility of the ADC. The low
power dissipation is reduced even more, drawing only
8.5mW in power shutdown mode. Instant wake-up from
power shutdown allows the converter to be powered
down even during brief inactive periods.
The LTC1279 converts 0V to 5V unipolar inputs from a
single 5V supply and ±2.5V bipolar inputs from ±5V
supplies. Maximum DC specs include ±1LSB INL and
±1LSB DNL. Outstanding guaranteed AC performance
includes 70dB S/(N + D) and 78dB THD at the input
frequency of 100kHz over temperature.
The internal clock is trimmed for 1.4µs conversion time.
The clock automatically synchronizes to each sample
command, eliminating problems with asynchronous clock
noise found in competitive devices. A separate conversion
start input and a data-ready signal (BUSY) ease connec-
tions to FIFOs, DSPs and microprocessors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATI
Single 5V Supply, 600kHz, 12-Bit Sampling A/D Converter
2.42V
REFERENCE
OUTPUT
+
10µF
LTC1279
ANALOG INPUT
(0V TO 5V)
1
2
A_IN
24
AV_{DD 23}
3 ^VREF
V_{SS 22}
0.1µF
AGND
4
BUSY
21
D11 (MSB)
CS
5
20
D10
RD
6
19
D9
CONVST
7
18
D8
SHDN
8
17
12-BIT
PARALLEL
D7
9
D6
10
DV_{DD 16}
D0
15
BUS
D5
11
D1
14
D4
D2
12
13
DGND
D3
5V
+
10µF
0.1µF
µP CONTROL
LINES
CONVERSION-START INPUT
POWER SHUTDOWN INPUT
LTC1279 • TA01
Effective Bits and Signal-to-(Noise + Distortion)
vs Input Frequency
12
11
10
NYQUIST
9
FREQUENCY
8
7
6
5
4
3
2
1 f_SAMPLE = 600kHz
0
10k
100k
1M
FREQUENCY (Hz)
74
68
62
56
50
5M
1279 G03
1