MAX1146 Datasheet, PDF (5/25 Pages) Maxim Integrated Products – Multichannel, True-Differential, Serial, 14-Bit ADCs

Multichannel, True-Differential,
Serial, 14-Bit ADCs
TIMING CHARACTERISTICS
(VDD = 4.75V to 5.25V (MAX1146/MAX1148), VDD = 2.7V to 3.6V (MAX1147/MAX1149), SHDN = VDD, VCOM = 0, fSCLK = 2.1MHz,
external clock (50% duty cycle), 18 clocks/conversion (116ksps), VREFADJ = VDD, CREF = 2.2µF, external +4.096V reference at REF
for the MAX1146/MAX1148, external 2.500V reference at REF for the MAX1147/MAX1149, TA = TMIN to TMAX, unless otherwise noted.
Typical values are at TA = +25°C.) (Figures 1, 2, and 3)
PARAMETER
DIN to SCLK Setup Time
DIN to SCLK Hold Time
SCLK Fall to Output Data Valid
CS Fall to DOUT Enable
CS Rise to DOUT Disable
SHDN Rise CS Fall to SCLK Rise
Time
SHDN Rise CS Fall to SCLK Rise
Hold Time
SCLK Clock Frequency
SCLK Pulse-Width High
SCLK Pulse-Width Low
CS Fall to SSTRB Output Enable
CS Rise to SSTRB Output Disable
SSTRB Rise to SCLK Rise
SCLK Fall to SSTRB Edge
CS Pulse Width
SYMBOL
tDS
tDH
tDOV
tDOE
tDOD
tCSS
tCSH
fSCLK
tCH
tCL
tSTE
tSTD
tSCK
tSCST
tCSW
CONDITIONS
CLOAD = 50pF
CLOAD = 50pF
CLOAD = 50pF
External clock mode
Internal clock mode
Internal clock mode
Internal clock mode
External clock mode only
External clock mode only
Internal clock mode only
MIN TYP MAX UNITS
50
ns
0
ns
10
80
ns
120
ns
120
ns
50
ns
50
ns
0.1
2.1
MHz
0
2.1
100
ns
100
ns
120
ns
120
ns
0
ns
80
ns
100
ns
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Tested at VDD = 3.0V (MAX1147/MAX1149) or 5.0V(MAX1146/MAX1148); VCOM = 0; unipolar single-ended input mode.
Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range has
been calibrated.
Offset nulled. Measured with external reference.
“On” channel grounded; full-scale 1kHz sine wave applied to all “off” channels.
Conversion time defined as the number of clock cycles multiplied by the clock period; clock has 50% duty cycle. (See
Figures 8–11.)
The common-mode range for the analog inputs is from AGND to V_DD.
Digital inputs equal V_DD or DGND.
External load should not change during conversion for specified accuracy.
Measured as (V_FS x 3.6V) - (V_FS x 2.7V) for the MAX1147/MAX1149 and (V_FS x 5.25V) - (V_FS x 4.75V) for the
MAX1146/MAX1148. V_DD = 3.6V to 2.7V for MAX1147/MAX1149 and V_DD = 5.25V to 4.75V for the MAX1146/MAX1148.
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