LTC1403ACMSE Linear Technology, LTC1403ACMSE Datasheet - Page 9

• Manufacturer Part Number: LTC1403ACMSE
• Description: IC ADC 14BIT 2.8MSPS DIFF 10MSOP
• Manufacturer: Linear Technology

Specifications of LTC1403ACMSE

• Number Of Bits: 14
• Sampling Rate (per Second): 2.8M
• Data Interface: Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 12mW
• Voltage Supply Source: Single Supply
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

DRIVING THE ANALOG INPUT
The differential analog inputs of the LTC1403/LTC1403A
are easy to drive. The inputs may be driven differentially or
as a single-ended input (i.e., the A
Both differential analog inputs, A
at the same instant. Any unwanted signal that is common
to both inputs of each input pair will be reduced by the
common mode rejection of the sample-and-hold circuit.
The inputs draw only one small current spike while charging
the sample-and-hold capacitors at the end of conversion.
During conversion, the analog inputs draw only a small
leakage current. If the source impedance of the driving
circuit is low, then the LTC1403/LTC1403A inputs can be
driven directly. As source impedance increases, so will
acquisition time. For minimum acquisition time with high
source impedance, a buffer amplifi er must be used. The
main requirement is that the amplifi er driving the analog
input(s) must settle after the small current spike before
the next conversion starts (settling time must be 39ns for
full throughput rate). Also keep in mind while choosing an
input amplifi er, the amount of noise and harmonic distor-
tion added by the amplifi er.
CHOOSING AN INPUT AMPLIFIER
Choosing an input amplifi er is easy if a few requirements
are taken into consideration. First, to limit the magnitude
of the voltage spike seen by the amplifi er from charging
the sampling capacitor, choose an amplifi er that has a low
output impedance (<100Ω) at the closed-loop bandwidth
frequency. For example, if an amplifi er is used in a gain
of 1 and has a unity-gain bandwidth of 50MHz, then the
output impedance at 50MHz must be less than 100Ω. The
second requirement is that the closed-loop bandwidth must
be greater than 40MHz to ensure adequate small-signal
settling for full throughput rate. If slower op amps are
used, more time for settling can be provided by increasing
the time between conversions. The best choice for an op
amp to drive the LTC1403/LTC1403A will depend on the
application. Generally, applications fall into two categories:
AC applications where dynamic specifi cations are most
critical and time domain applications where DC accuracy
and settling time are most critical. The following list is
a summary of the op amps that are suitable for driving
the LTC1403/LTC1403A. (More detailed information is
APPLICATIONS INFORMATION
IN
+
IN
with A
–
input is grounded).
IN
–
, are sampled
available in the Linear Technology Databooks and on the
LinearView
LTC
Pass Filter.
LT1630: Dual 30MHz Rail-to-Rail Voltage FB Amplifi er.
2.7V to ±15V supplies. Very high A
520ns settling to 0.5LSB for a 4V swing. THD and noise
are –93dB to 40kHz and below 1LSB to 320kHz (A
2V
applications (to 1/3 Nyquist) where rail-to-rail performance
is desired. Quad version is available as LT1631.
LT1632: Dual 45MHz Rail-to-Rail Voltage FB Amplifi er.
2.7V to ±15V supplies. Very high A
400ns settling to 0.5LSB for a 4V swing. It is suitable
for applications with a single 5V supply. THD and noise
are –93dB to 40kHz and below 1LSB to 800kHz (A
2V
AC applications where rail-to-rail performance is desired.
Quad version is available as LT1633.
LT1813: Dual 100MHz 750V/μs 3mA Voltage Feedback
Amplifi er. 5V to ±5V supplies. Distortion is –86dB to
100kHz and –77dB to 1MHz with ±5V supplies (2V
into 500Ω). Excellent part for fast AC applications with
±5V supplies.
LT1801: 80MHz GBWP, –75dBc at 500kHz, 2mA/Amplifi er,
8.5nV/√ ⎯ H ⎯ z .
LT1806/LT1807: 325MHz GBWP, –80dBc Distortion at
5MHz, Unity-Gain Stable, R-R In and Out, 10mA/Ampli-
fi er, 3.5nV/√ ⎯ H ⎯ z .
LT1810: 180MHz GBWP, –90dBc Distortion at 5MHz, Unity-
Gain Stable, R-R In and Out, 15mA/Amplifi er, 16nV/√ ⎯ H ⎯ z .
LT1818/LT1819: 400MHz, 2500V/μs,9mA, Single/Dual
Voltage Mode Operational Amplifi er.
LT6200: 165MHz GBWP, –85dBc Distortion at 1MHz,
Unity-Gain Stable, R-R In and Out, 15mA/Amplifi er,
0.95nV/√ ⎯ H ⎯ z .
LT6203: 100MHz GBWP, –80dBc Distortion at 1MHz, Unity-
Gain Stable, R-R In and Out, 3mA/Amplifi er, 1.9nV/√ ⎯ H ⎯ z .
LT6600-10: Amplifi er/Filter Differential In/Out with 10MHz
Cutoff.
LinearView is a trademark of Linear Technology Corporation.
P-P
P-P
®
1566-1: Low Noise 2.3MHz Continuous Time Low-
into 1kΩ, V
into 1kΩ, V
TM
CD-ROM.)
LTC1403/LTC1403A
S
S
= 5V), making the part excellent for AC
= 5V), making the part excellent for
VOL
VOL
, 500μV offset and
, 1.5mV offset and
V
V
1403fb
= 1,
= 1,
9
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