MAX1034_12 Datasheet, PDF (16/31 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
BYTE 4
DIN
S C2 C1 C0 0 0 0 0
DOUT
ANALOG INPUT
TRACK AND HOLD* _HOLD
tACQ
TRACK
HIGH
IMPEDANCE
fSAMPLE ≈ fSCLK / 32 + fINTCLK / 17
B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 X X
SAMPLING INSTANT
100ns to 400ns
HOLD
INTCLK**
*TRACK AND HOLD TIMING IS CONTROLLED BY SCLK.
**INTCLK IS AN INTERNAL SIGNAL AND IS NOT ACCESSIBLE TO THE USER.
Figure 3. External Acquisition-Mode Conversion (Mode 1)
fINTCLK ≈ 4.5MHz
Figure 8 illustrates the software-selectable differential
analog input voltage range that produces a valid digital
output. Each analog input differential pair can be inde-
pendently programmed to one of three differential input
ranges by setting the R[2:0] control bits with DIF/SGL = 1.
Regardless of the specified input voltage range and
whether the channel is selected, each analog input is
±6V fault tolerant. The analog input fault protection is
active whether the device is unpowered or powered.
Any voltage beyond FSR, but within the ±6V fault-
tolerant range, applied to an analog input results in a
full-scale output voltage for that channel.
Clamping diodes with breakdown thresholds in excess
of 6V protect the MAX1034/MAX1035 analog inputs
during ESD and other transient events (Figure 6). The
clamping diodes do not conduct during normal device
operation, nor do they limit the current during such
transients. When operating in an environment with the
potential for high-energy voltage and/or current tran-
sients, protect the MAX1034/MAX1035 externally.
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