LTC1415CSW#PBF Linear Technology, LTC1415CSW#PBF Datasheet - Page 11

• Manufacturer Part Number: LTC1415CSW#PBF
• Description: IC A/D CONV 12BIT SAMPLNG 28SOIC
• Manufacturer: Linear Technology

Specifications of LTC1415CSW#PBF

• Number Of Bits: 12
• Sampling Rate (per Second): 1.25M
• Data Interface: Parallel
• Number Of Converters: 1
• Power Dissipation (max): 100mW
• Voltage Supply Source: Single Supply
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (0.300", 7.50mm Width)
• Number Of Elements: 1
• Resolution: 12Bit
• Architecture: SAR
• Sample Rate: 1.25MSPS
• Input Polarity: Unipolar
• Input Type: Voltage
• Rated Input Volt: 4.096V
• Differential Input: Yes
• Power Supply Requirement: Analog and Digital
• Single Supply Voltage (typ): 5V
• Single Supply Voltage (min): 4.75V
• Single Supply Voltage (max): 5.25V
• Dual Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Power Dissipation: 100mW
• Differential Linearity Error: ±1LSB
• Integral Nonlinearity Error: ±1LSB
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 28
• Package Type: SOIC W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIONS
The following list is a summary of the op amps that are
suitable for driving the LTC1415, more detailed informa-
tion is available in the Linear Technology databooks and
the LinearView
LT
supply op amps. Single 5V to 15V supplies, 6.6mA
specifications, 90ns settling to 0.5LSB.
LT1223: 100MHz video current feedback amplifier. 5V
to 15V supplies, 6mA supply current. Low distortion up
to and above 400kHz. Low noise. Good for AC applica-
tions.
LT1227: 140MHz video current feedback amplifier. 5V
to 15V supplies, 10mA supply current. Lowest distor-
tion at frequencies above 400kHz. Low noise. Best for AC
applications.
LT1229/LT1230: Dual and quad 100MHz current feedback
amplifiers. 2V to 15V supplies, 6mA supply current
each amplifier. Low noise. Good AC specs.
LT1360: 37MHz voltage feedback amplifier. 5V to 15V
supplies. 3.8mA supply current. Good AC and DC specs.
70ns settling to 0.5LSB.
LT1363: 50MHz, 450V/ s op amps. 5V to 15V sup-
plies. 6.3mA supply current. Good AC and DC specs. 60ns
settling to 0.5LSB.
LT1364/LT1365: Dual and quad 50MHz, 450V/ s op amps.
fier. 60ns settling to 0.5LSB.
Input Filtering
The noise and the distortion of the input amplifier and
other circuitry must be considered since they will add to
the LTC1415 noise and distortion. The small-signal band-
width of the sample-and-hold circuit is 20MHz. Any noise
or distortion products that are present at the analog inputs
will be summed over this entire bandwidth. Noisy input
circuitry should be filtered prior to the analog inputs to
minimize noise. A simple 1-pole RC filter is sufficient for
many applications. For example Figure 7 shows a 1000pF
capacitor from +A
to limit the input bandwidth to 1.6MHz. The 1000pF
LinearView is a trademark of Linear Technology Corporation.
5V to 15V supplies, 6.3mA supply current per ampli-
®
1215/LT1216: Dual and quad 23MHz, 50V/ s single
TM
CD-ROM.
IN
U
to ground and a 100 source resistor
INFORMATION
U
W
U
capacitor also acts as a charge reservoir for the input
sample-and-hold and isolates the ADC input from sam-
pling glitch sensitive circuitry. High quality capacitors and
resistors should be used since these components can add
distortion. NPO and silver mica type dielectric capacitors
have excellent linearity. Carbon surface mount resistors can
also generate distortion from self heating and from damage
that may occur during soldering. Metal film surface mount
resistors are much less susceptible to both problems.
Input Range
The 4.096V input range of the LTC1415 is optimized for
low noise. Most single supply op amps also perform well
over this same range, allowing direct coupling to the
analog inputs and eliminating the need for special transla-
tion circuitry.
Some applications may require other input ranges. The
LTC1415 differential inputs and reference circuitry can
accommodate other input ranges often with little or no
additional circuitry. The following sections describe the
reference and input circuitry and how they affect the input
range.
Internal Reference
The LTC1415 has an on-chip, temperature compensated,
curvature corrected, bandgap reference that is factory
trimmed to 2.500V. It is connected internally to a reference
amplifier and is available at V
2k resistor is in series with the output so that it can be
easily overdriven by an external reference or other
ANALOG INPUT
Figure 7. RC Input Filter
1000pF
100
10 F
REF
1
2
3
4
5
+A
–A
V
REFCOMP
AGND
(Pin 3) see Figure 8a. A
REF
IN
IN
LTC1415
LTC1415 • F07
LTC1415
11