Datasheet LTC1402 (Analog Devices) - 7

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