Datasheet

5
LTC1414
TYPICAL PERFOR A CE CHARACTERISTICS
UW
PIN FUNCTIONS
UUU
A
IN
+
(Pin 1): Positive Analog Input. ±2.5V input range
when A
IN
–
is grounded. ±2.5V differential if A
IN
–
is driven
differentially with A
IN
+
.
A
IN
–
(Pin 2): Negative Analog Input. Can be grounded or
driven differentially with A
IN
+
.
V
REF
(Pin 3): 2.5V Reference Output.
REFCOMP (Pin 4): 4.06V Reference Bypass Pin.
Bypass to AGND with 10µF ceramic or 10µF tantalum in
parallel with 0.1µF ceramic.
AGND (Pin 5): Analog Ground.
D13 to D6 (Pins 6 to 13): Data Outputs.
OGND (Pin 14): Digital Ground for the Output Drivers. Tie
to AGND
D5 to D0 (Pins 15 to 20): Data Outputs.
OV
DD
(Pin 21): Positive Supply for the Output Drivers. Tie
to Pin 28 when driving 5V logic. For 3V logic, tie to supply
of the logic being driven.
DV
DD
(Pin 22): 5V Positive Supply. Tie to Pin 28.
DGND (Pin 23): Digital Ground. Tie to AGND.
CONVST (Pin 24): Conversion Start Signal. This active low
signal starts a conversion on its falling edge.
Spurious-Free Dynamic Range vs
Input Frequency Intermodulation Distortion Plot
Differential Nonlinearity vs
Output Code
INPUT FREQUENCY (Hz)
10k
SPURIOUS-FREE DYNAMIC RANGE (dB)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
100k 1M 10M
1414 G04
OUTPUT CODE
0 4096 8192 12288 16384
DNL (LSBs)
1414 G06
2.0
1.0
0
–1.0
–2.0
Integral Nonlinearity vs Output
Code
Power Supply Feedthrough vs
Ripple Frequency
Input Common Mode Rejection vs
Input Frequency
INPUT FREQUENCY (Hz)
1k
COMMON MODE REJECTION (dB)
80
70
60
50
40
30
20
10
0
10k 100k
LTC1414 • F12
1M 10M
OUTPUT CODE
0 4096 8192 12288 16384
INL (LSBs)
1414 G07
2.0
1.0
0
–1.0
–2.0
FREQUENCY (kHz)
0 400 800200 600 1000
AMPLITUDE (dB)
1414 F05a
0
–20
–40
–60
–80
–100
–120
f
SAMPLE
= 2.2MHz
f
IN1
= 80.566kHz
f
IN2
= 97.753kHz
RIPPLE FREQUENCY (Hz)
0 2M4M6M8M10M
AMPLITUDE OF POWER SUPPLY
FEEDTHROUGH (dB)
1414 G08
0
–20
–40
–60
–80
–100
–120
V
SS
(V
RIPPLE
= 0.02V)
V
DD
(V
RIPPLE
= 0.2V)
OGND (V
RIPPLE
= 0.5V)
OV
DD
(V
RIPPLE
= 0.5V)