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LTC1420C Datasheet

  • LTC1420C

  • Linear Technology [12-Bit, 10Msps, Sampling ADC]

  • 270.55KB

  • LINER

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LTC1420
12-Bit, 10Msps,
Sampling ADC
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
10Msps Sample Rate
Single 5V Supply or
鹵
5V Supplies
Integral Nonlinearity Error <0.35LSB
Differential Nonlinearity <0.25LSB
71dB S/(N + D) and 83dB SFDR at Nyquist
100MHz Full-Power Bandwidth Sampling
鹵2.048V, 鹵1.024V
and
鹵0.512V
Bipolar Input Range
Input PGA
Out-of-Range Indicator
True Differential Inputs with 75dB CMRR
Power Dissipation: 250mW
28-Pin Narrow SSOP Package
The LTC
廬
1420 is a 10Msps, 12-bit sampling A/D converter
that draws only 250mW from either single 5V or dual
鹵5V
supplies. This easy-to-use device includes a high dynamic
range sample-and-hold, a precision reference and a PGA
input circuit.
The LTC1420 has a flexible input circuit that allows full-
scale input ranges of
鹵2.048V 鹵1.024V
and
鹵0.512V.
The
input common mode voltage is arbitrary, though a 2.5V
reference is provided for single supply applications. The
input PGA has a digitally selectable 1x or 2x gain.
Maximum DC specs include
鹵1LSB
INL and
鹵1LSB
DNL
over temperature. Outstanding AC performance includes
71dB S/(N + D) and 83dB SFDR at the Nyquist input
frequency of 5MHz.
The unique differential input sample-and-hold can acquire
single-ended or differential input signals up to its 100MHz
bandwidth. The 75dB common mode rejection allows
users to eliminate ground loops and common mode noise
by measuring signals differentially from the source. A
separate output logic supply allows direct connection to
3V components.
APPLICATIO S
s
s
s
s
s
s
Telecommunications
Digital Signal Processing
Multiplexed Data Acquisition Systems
High Speed Data Acquisition
Spectral Analysis
Imaging Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
5V
1碌F
28
GAIN
5V
1碌F
7
V
DD
5V
1碌F
23
V
DD
22
OV
DD
OPTIONAL 3V
LOGIC SUPPLY
+
VIN
1 +
A
IN
S/H
2 鈥揂
IN
3 V
CM
PIPELINED 12-BIT ADC
OF 27
D11 (MSB) 10
INL (LSBs)
鈥?/div>
1碌F
OUTPUT
BUFFERS
MODE SELECT
DIGITAL CORRECTION
LOGIC
D0 (LSB) 20
CLK 26
DIGITAL
OUTPUT
4 SENSE
2.5V
REFERENCE
5 V
REF
1碌F
2.048V
10MHz CLK
V
SS
25
1碌F
0V OR 鈥?V
GND
6
GND
8
GND
24
OGND
21
1420 TA01
U
Typical INL Curve
1.00
0.75
0.50
0.25
0
鈥?.25
鈥?.50
鈥?.75
鈥?.00
0
1024
2048
CODE
3072
4096
1420 TA02
U
U
1

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