LTC1415
12-Bit, 1.25Msps, 55mW
Sampling A/D Converter
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DESCRIPTIO
EATURE
S
F
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
rangesample-and-hold,precisionreferenceandatrimmed
internal clock. Two power shutdown modes provide flex-
ibility for low power systems.
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1.25Msps Sample Rate
Single 5V Supply
Power Dissipation: 55mW
Nap and Sleep Power Shutdown Modes
±
0.35LSB INL and ±0.25LSB DNL
72dB S/(N + D) and 80dB THD at 100kHz
External or Internal Reference Operation
True Differential Inputs Reject Common Mode Noise
Input Range: 4.096V (1mV/LSB)
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.
28-Pin SSOP and SO Packages
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PPLICATI
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A
Theuniquedifferentialinputsample-and-holdcanacquire
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.
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High Speed Data Acquisition
Imaging Systems
Digital Signal Processing
Multiplexed Data Acquisition Systems
Telecommunications
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATI
1.25MHz, 12-Bit Sampling A/D Converter
Effective Bits and Signal-to-(Noise + Distortion)
vs Input Frequency
LTC1415
5V
DIFFERENTIAL
ANALOG INPUT
(0V TO 4.096V)
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
12
11
10
9
74
68
62
56
+A
–A
AV
DV
OV
IN
IN
DD
DD
DD
10µF
3
OUTPUT LOGIC
2.50V
OUTPUT
NYQUIST
FREQUENCY
V
REF
SUPPLY 3V OR 5V
V
REF
4
REFCOMP
AGND
BUSY
CS
5
8
10µF
6
7
D11(MSB) CONVST
µP CONTROL
LINES
7
6
D10
D9
RD
SHDN
NAP/SLP
OGND
D0
8
5
9
4
D8
10
11
12
13
14
3
D7
12-BIT
PARALLEL
BUS
2
D6
1
D5
D1
f
= 1.25Msps
10k
SAMPLE
0
D4
D2
1k
100k
1M 2M
DGND
D3
INPUT FREQUENCY (Hz)
LTC1415 • TA02
1415 TA01
1