LTC1402 Linear Technology, LTC1402 Datasheet - Page 7

• Manufacturer Part Number: LTC1402
• Description: Serial 12-Bit/ 2.2Msps Sampling ADC with Shutdown
• Manufacturer: Linear Technology

TYPICAL PERFOR A CE CHARACTERISTICS
Unipolar Mode Plots Run with a Single 5V Supply. V
PIN
AV
and solid analog ground plane with 10 F ceramic (or 10 F
tantalum in parallel with 0.1 F 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
unipolar mode and 2.048V in bipolar mode when A
grounded. Both of these ranges operate fully differentially
with respect to A
IN
4.095
4.090
4.085
4.080
4.075
4.070
4.065
4.095
4.090
4.085
4.080
4.075
4.070
4.065
DD
U
+
(Pin 3): Positive Analog Signal Input. 0V to 4.096V in
4.5
– 5
(Pin 1): 5V Analog Power Supply. Bypass to AGND1
Positive Power Supply Rejection
for V
Negative Power Supply Rejection
for V
FUNCTIONS
4.75
REF
REF
U
– 4
5.0
IN
–3
V
V
–
DD
SS
5.25
. (Note 3)
U
(V)
(V)
–2
5.5
W
–1
5.75
1402 G21
1402 G19
U
6.0
0
–0.25
–0.50
–0.75
–1.00
–0.25
–0.50
–0.75
–1.00
1.00
0.75
0.50
0.25
1.00
0.75
0.50
0.25
0
0
DD
0
0
Differential Nonlinearity
vs Output Code (Bipolar)
Differential Nonlinearity
vs Output Code (Unipolar)
f
f
SAMPLE
SAMPLE
= 5V, V
512
512
IN
1024
1024
= 2.2MHz
= 2.2MHz
–
SS
is
1536
1536
= – 5V for Bipolar, V
CODE
CODE
2048
2048
A
or driven differentially with A
that it inverts the input signal. (Note 3)
V
AGND1 and solid analog ground plane with 10 F ceramic
(or 10 F tantalum in parallel with 0.1 F 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.
IN
REF
2560
2560
–
(Pin 4): Negative Analog Signal Input. Can be grounded
(Pin 5): 4.096V Reference Voltage Output. Bypass to
3072
3072
3584
3584
(Bipolar Mode Plots Run with Dual 5V Supplies.
1402 G15
1402 G17
DD
4096
4096
= 5V, V
–0.25
–0.50
–0.75
–1.00
–0.25
–0.50
–0.75
–1.00
1.00
0.75
0.50
0.25
1.00
0.75
0.50
0.25
SS
0
0
= 0V for Unipolar), T
0
0
Integral Nonlinearity
vs Output Code (Bipolar)
Integral Nonlinearity
vs Output Code (Unipolar)
f
f
SAMPLE
SAMPLE
512
512
IN
+
1024
1024
. Identical to A
= 2.2MHz
= 2.2MHz
1536
1536
2048
CODE
2048
CODE
LTC1402
A
2560
2560
= 25 C.
IN
3072
3072
+
, except
3584
3584
1402 G14
1402 G16
7
4096
4096