LTC1402
TYPICAL PERFOR A CE CHARACTERISTICS
Positive Power Supply Rejection
for V
REF
4.095
1.00
f
SAMPLE
= 2.2MHz
0.75
0.50
(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.
Differential Nonlinearity
vs Output Code (Bipolar)
1.00
f
SAMPLE
= 2.2MHz
0.75
0.50
INTERNAL REFERENCE VOLTAGE (mV)
4.090
4.085
DNL (LSB)
4.080
4.075
4.070
0
INL (LSB)
512 1024 1536 2048 2560 3072 3584 4096
CODE
1402 G15
4.065
4.5
4.75
5.0
5.25
V
DD
(V)
5.5
5.75
6.0
Negative Power Supply Rejection
for V
REF
4.095
1.00
INTERNAL REFERENCE VOLTAGE (mV)
4.090
4.085
DNL (LSB)
4.080
4.075
4.070
4.065
–5
–4
–3
–2
V
SS
(V)
–1
0
1402 G19
0
INL (LSB)
PIN FUNCTIONS
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.
U W
Integral Nonlinearity
vs Output Code (Bipolar)
0.25
0.25
0
–0.25
–0.50
–0.75
–1.00
0
–0.25
–0.50
–0.75
–1.00
0
512 1024 1536 2048 2560 3072 3584 4096
CODE
1402 G14
1402 G21
Differential Nonlinearity
vs Output Code (Unipolar)
1.00
f
SAMPLE
= 2.2MHz
0.75
0.50
0.25
0.75
0.50
0.25
0
Integral Nonlinearity
vs Output Code (Unipolar)
f
SAMPLE
= 2.2MHz
–0.25
–0.50
–0.75
–1.00
0
512 1024 1536 2048 2560 3072 3584 4096
CODE
1402 G17
–0.25
–0.50
–0.75
–1.00
0
512 1024 1536 2048 2560 3072 3584 4096
CODE
1402 G16
U
U
U
7
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