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LTC1412I Datasheet

  • LTC1412I

  • 12-Bit, 3Msps, Sampling A/D Converter

  • 502.35KB

  • 16頁(yè)

  • LINER

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LTC1412
12-Bit, 3Msps,
Sampling A/D Converter
FEATURES
s
s
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DESCRIPTION
The LTC
廬
1412 is a 12-bit, 3Msps, sampling A/D con-
verter. This high performance device includes a high
dynamic range sample-and-hold and a precision refer-
ence. Operating from
鹵5V
supplies it draws only 150mW.
The
鹵2.5V
input range is optimized for low noise and low
distortion. Most high performance op amps also perform
best over this range, allowing direct coupling to the analog
inputs and eliminating the need for special translation
circuitry. Outstanding AC performance includes 72dB
S/(N + D) and 82dB SFDR at the Nyquist input frequency
of 1.5MHz.
The unique differential input sample-and-hold can acquire
single-ended or differential input signals up to its 40MHz
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 high speed 12-bit parallel output port. There
is no pipeline delay in the conversion results. A separate
convert start input and converter status signal (BUSY)
ease connections to FIFOs, DSPs and microprocessors. A
digital output driver power supply pin allows direct con-
nection to 3V logic.
Sample Rate: 3Msps
72dB S/(N + D) and 82dB SFDR at Nyquist
鹵0.35LSB
INL and
鹵0.25LSB
DNL (Typ)
Power Dissipation: 150mW
External or Internal Reference Operation
True Differential Inputs Reject Common Mode Noise
40MHz Full Power Bandwidth Sampling
鹵2.5V
Bipolar Input Range
No Pipeline Delay
28-Pin SSOP Package
APPLICATIONS
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Telecommunications
Digital Signal Processing
Mulitplexed Data Acquisition Systems
High Speed Data Acquisition
Spectrum Analysis
Imaging Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
5V
10碌F
AV
DD
LTC1412
EFFECTIVE NUMBER OF BITS
A
IN+
S/H
A
IN鈥?/div>
4.0625V
COMP
10碌F
V
REF
BUFFER
2k
BUSY
CS
CONVST
OGND
1412 TA01
OPTIONAL
3V LOGIC
SUPPLY
DV
DD
OV
DD
Effective Bits and Signal-to-Noise + Distortion
vs Input Frequency
12
10
8
6
4
2
0
1k
10k
100k
1M
INPUT FREQUENCY (Hz)
10M
1412 G01
12
12-BIT ADC
OUTPUT
BUFFERS
鈥?/div>
鈥?/div>
鈥?/div>
D11 (MSB)
D0 (LSB)
2.5V
REFERENCE
AGND
TIMING AND
LOGIC
DGND
V
SS
10碌F
鈥?5V
U
U
U
74
68
62
56
S/(N + D) (dB)
1

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