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LT6660 Datasheet(PDF) 11 Page - Linear Technology

Part # LT6660
Description  Easy-to-Use, Ultra-Tiny, Differential, 16-Bit ADC With I2C Interface
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT6660 Datasheet(HTML) 11 Page - Linear Technology

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LTC2453
11
2453f
first to the decoupling capacitors described above, the
second to the ground return for the input signal source,
and the third to the ground return for the power supply
voltage source.
Driving REF+ and REF
A simplified equivalent circuit for REF+ and REFis shown
in Figure 8. Like all other A/D converters, the LTC2453 is
only as accurate as the reference it is using. Therefore, it
is important to keep the reference line quiet by careful low
and high frequency power supply decoupling.
The LT6660 reference is an ideal match for driving the
LTC2453’s REF+ pin. The LTC6660 is available in a 2mm
×
2mm DFN package with 2.5V, 3V, 3.3V and 5V options.
A 0.1μF, high quality, ceramic capacitor in parallel with
a 10μF ceramic capacitor should be connected between
the REF+/REFand GND pins, as close as possible to the
RSW
15k
(TYP)
ILEAK
ILEAK
VCC
VCC
VCC
VCC
CEQ
0.35pF
(TYP)
IN+
IN–
REF
REF+
2453 F08
RSW
15k
(TYP)
ILEAK
ILEAK
RSW
15k
(TYP)
ILEAK
ILEAK
RSW
15k
(TYP)
ILEAK
ILEAK
Figure 8. LTC2453 Analog Input/Reference Equivalent Circuit
ILEAK
ILEAK
RSW
15k
(TYP)
ICONV
CIN
IN+
VCC
SIG+
SIG
RS
CEQ
0.35pF
(TYP)
CPAR
+
2453 F09
ILEAK
ILEAK
RSW
15k
(TYP)
ICONV
CIN
IN
VCC
RS
CEQ
0.35pF
(TYP)
CPAR
+
Figure 9. LTC2453 Input Drive Equivalent Circuit
package. The 0.1μF capacitor should be placed closest
to the ADC.
Driving VIN+ and VIN–
The input drive requirements can best be analyzed using
the equivalent circuit of Figure 9. The input signal VSIG is
connected to the ADC input pins (IN+ and IN) through an
equivalent source resistance RS.Thisresistorincludesboth
the actual generator source resistance and any additional
optional resistors connected to the input pins. Optional
input capacitors CIN are also connected to the ADC input
pins. This capacitor is placed in parallel with the ADC
input parasitic capacitance CPAR. Depending on the PCB
layout, CPAR has typical values between 2pF and 15pF. In
addition, the equivalent circuit of Figure 9 includes the
converter equivalent internal resistor RSW and sampling
capacitor CEQ.
There are some immediate trade-offs in RS and CIN without
needing a full circuit analysis. Increasing RS and CIN can
give the following benefits:
1) Due to the LTC2453’s input sampling algorithm, the
input current drawn by either VIN+ or VIN– over a con-
version cycle is 50nA. A high RS • CIN attenuates the
high frequency components of the input current, and
RS values up to 1k result in <1LSB error.
APPLICATIONS INFORMATION


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