Datasheet

7
LTC1402
PIN FUNCTIONS
UUU
AV
DD
(Pin 1): 5V Analog Power Supply. Bypass to AGND1
and solid analog ground plane with 10µF ceramic (or 10µF
tantalum in parallel with 0.1µF ceramic).
AGND1 (Pin 2): Analog Ground. Tie to solid analog ground
plane. The analog ground plane should be solid and have
no cuts near the LTC1402.
A
IN
+
(Pin 3): Positive Analog Signal Input. 0V to 4.096V in
unipolar mode and ±2.048V in bipolar mode when A
IN
–
is
grounded. Both of these ranges operate fully differentially
with respect to A
IN
–
. (Note 3)
A
IN
–
(Pin 4): Negative Analog Signal Input. Can be grounded
or driven differentially with A
IN
+
. Identical to A
IN
+
, except
that it inverts the input signal. (Note 3)
V
REF
(Pin 5): 4.096V Reference Voltage Output. Bypass to
AGND1 and solid analog ground plane with 10µF ceramic
(or 10µF tantalum in parallel with 0.1µF ceramic).
AGND2 (Pin 6): Analog Ground Return for the Reference
and Internal CDAC. AGND2 could be overdriven externally
above ground. Tie to solid analog ground plane.
Differential Nonlinearity
vs Output Code (Unipolar)
Integral Nonlinearity
vs Output Code (Unipolar)
Negative Power Supply Rejection
for V
REF
Positive Power Supply Rejection
for V
REF
CODE
0
INL (LSB)
0
0.50
4096
1402 G16
–0.50
–1.00
1024
2048
3072
512
1536
2560
3584
1.00
–0.25
0.25
–0.75
0.75
f
SAMPLE
= 2.2MHz
CODE
0
DNL (LSB)
0
0.50
4096
1402 G17
–0.50
–1.00
1024
2048
3072
512
1536
2560
3584
1.00
–0.25
0.25
–0.75
0.75
f
SAMPLE
= 2.2MHz
V
SS
(V)
–5
4.065
INTERNAL REFERENCE VOLTAGE (mV)
4.070
4.075
4.080
4.085
4.090
4.095
–4 –3 –2 –1
1402 G19
0
V
DD
(V)
4.5
4.065
INTERNAL REFERENCE VOLTAGE (mV)
4.070
4.075
4.080
4.085
4.090
4.095
4.75 5.0 5.25 5.5 5.75
1402 G21
6.0
Differential Nonlinearity
vs Output Code (Bipolar)
Integral Nonlinearity
vs Output Code (Bipolar)
CODE
0
INL (LSB)
0
0.50
4096
1402 G14
–0.50
–1.00
1024
2048
3072
512
1536
2560
3584
1.00
–0.25
0.25
–0.75
0.75
f
SAMPLE
= 2.2MHz
CODE
0
DNL (LSB)
0
0.50
4096
1402 G15
–0.50
–1.00
1024
2048
3072
512
1536
2560
3584
1.00
–0.25
0.25
–0.75
0.75
f
SAMPLE
= 2.2MHz
TYPICAL PERFOR A CE CHARACTERISTICS
UW
(Bipolar Mode Plots Run with Dual ±5V Supplies.
Unipolar Mode Plots Run with a Single 5V Supply. V
DD
= 5V, V
SS
= –5V for Bipolar, V
DD
= 5V, V
SS
= 0V for Unipolar), T
A
= 25°C.