LTC1415_15 Datasheet, PDF (1/24 Pages) Linear Technology – 12-Bit, 1.25Msps, 55mW Sampling A/D Converter

FEATURES
s _{1.25Msps Sample Rate}
s _{Single 5V Supply}
s _{Power Dissipation: 55mW}
s _{Nap and Sleep Power Shutdown Modes}
s _{±0.35LSB INL and ±0.25LSB DNL}
s _{72dB S/(N + D) and 80dB THD at 100kHz}
s _{External or Internal Reference Operation}
s _{True Differential Inputs Reject Common Mode Noise}
s _{Input Range: 4.096V (1mV/LSB)}
s _{28-Pin SSOP and SO Packages}
APPLICATI S
s _{High Speed Data Acquisition}
s _{Imaging Systems}
s _{Digital Signal Processing}
s _{Multiplexed Data Acquisition Systems}
s _{Telecommunications}
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC1415
12-Bit, 1.25Msps, 55mW
Sampling A/D Converter
DESCRIPTIO
The LTC^®1415 is a 700ns, 1.25Msps, 12-bit sampling
A/D converter that draws only 55mW from a single 5V
supply. This easy-to-use device includes a high dynamic
range sample-and-hold, precision reference and a trimmed
internal clock. Two power shutdown modes provide flex-
ibility for low power systems.
The LTC1415’s full-scale input range is 4.096V. Low
linearity errors ±0.35LSB INL, ± 0.25LSB DNL make it
ideal for imaging systems. Outstanding AC performance
includes 72dB S/(N + D) and 80dB THD with an input
frequency of 100kHz.
The unique differential input sample-and-hold can acquire
single-ended or differential input signals up to its 18MHz
bandwidth. The 60dB common mode rejection allows
users to eliminate ground loops and common mode noise
by measuring signals differentially from the source.
The ADC has a µP compatible, 12-bit parallel output port.
There is no pipeline delay in the conversion results. A
separate convert start input and data ready signal (BUSY)
ease connections to FIFOs, DSPs and microprocessors. A
separate output logic supply pin allows direct connection
to 3V components.
TYPICAL APPLICATI
1.25MHz, 12-Bit Sampling A/D Converter
LTC1415
DIFFERENTIAL ₁
28
ANALOG INPUT
(0V TO 4.096V)
2.50V
V_REF OUTPUT
2
3
4
+A_IN
–A_IN
V_REF
AV_{DD 27}
DV_{DD 26}
OV_{DD 25}
REFCOMP BUSY
5
24
10µF
AGND
6
CS
23
D11(MSB) CONVST
7
22
D10
RD
8
21
D9
SHDN
9
20
D8
NAP/SLP
10
19
D7
OGND
12-BIT 11
18
PARALLEL
D6
12
D0
17
BUS
D5
D1
13
16
D4
D2
14
15
DGND
D3
5V
OUTPUT LOGIC
SUPPLY 3V OR 5V
10µF
µP CONTROL
LINES
1415 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 _{fSAMPLE = 1.25Msps}
0
1k
10k
100k
INPUT FREQUENCY (Hz)
74
68
62
56
1M 2M
LTC1415 • TA02
1