MAX1034_12 Datasheet, PDF (17/31 Pages) Maxim Integrated Products – 8-/4-Channel, ±VREF Multirange Inputs,Serial 14-Bit ADCs

8-/4-Channel, ±V_REF Multirange Inputs,
Serial 14-Bit ADCs
CS
SSTRB
SCLK
BYTE 1
BYTE 2
BYTE 3
DIN
S C2 C1 C0 0 0 0 0
DOUT
ANALOG INPUT
TRACK AND HOLD*
HOLD
HIGH IMPEDANCE
tACQ
TRACK
100ns to 400ns
fSAMPLE ≈ fSCLK / 24 + fINTCLK / 28
SAMPLING INSTANT
INTCLK**
fINTCLK ≈ 4.5MHz
*TRACK AND HOLD TIMING IS CONTROLLED BY INTCLK, AND IS NOT ACCESSIBLE TO THE USER.
**INTCLK IS AN INTERNAL SIGNAL AND IS NOT ACCESSIBLE TO THE USER.
Figure 4. Internal Clock-Mode Conversion (Mode 2)
B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 X X
HOLD
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-6 -4 -2 0
2
4
6
ANALOG INPUT VOLTAGE (V)
R2
MAX1034
MAX1035
*R_{SOURCE IN_+}
R1
ANALOG
SIGNAL
SOURCE
V_SJ
R2
*R_{SOURCE IN_+}
R1
ANALOG
SIGNAL
SOURCE
V_SJ
Figure 5. Analog Input Current vs. Input Voltage
*MINIMIZE R_SOURCE TO AVOID GAIN ERROR AND DISTORTION.
Figure 6. Simplified Analog Input Circuit
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