LTC1402_1 Datasheet, PDF (7/24 Pages) Linear Technology – Serial 12-Bit, 2.2Msps Sampling ADC with Shutdown

LTC1402
TYPICAL PERFOR A CE CHARACTERISTICS (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.
Positive Power Supply Rejection
for V_REF
4.095
4.090
4.085
4.080
4.075
4.070
4.065
4.5 4.75 5.0 5.25 5.5 5.75 6.0
V_DD (V)
1402 G21
Negative Power Supply Rejection
for V_REF
4.095
4.090
4.085
4.080
4.075
4.070
4.065
–5 –4
–3
–2
V_SS (V)
–1
0
1402 G19
Differential Nonlinearity
vs Output Code (Bipolar)
1.00
f_SAMPLE = 2.2MHz
0.75
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
0
512 1024 1536 2048 2560 3072 3584 4096
CODE
1402 G15
Differential Nonlinearity
vs Output Code (Unipolar)
1.00
f_SAMPLE = 2.2MHz
0.75
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
0
512 1024 1536 2048 2560 3072 3584 4096
CODE
1402 G17
Integral Nonlinearity
vs Output Code (Bipolar)
1.00
f_SAMPLE = 2.2MHz
0.75
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
0
512 1024 1536 2048 2560 3072 3584 4096
CODE
1402 G14
Integral Nonlinearity
vs Output Code (Unipolar)
1.00
f_SAMPLE = 2.2MHz
0.75
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
0
512 1024 1536 2048 2560 3072 3584 4096
CODE
1402 G16
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.
7