MAX1226 Datasheet, PDF (12/24 Pages) Maxim Integrated Products – 12-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference

12-Bit 300ksps ADCs with FIFO,
Temp Sensor, Internal Reference
Conversion Time Calculations
The conversion time for each scan is based on a num-
ber of different factors: conversion time per sample,
samples per result, results per scan, if a temperature
measurement is requested, and if the external refer-
ence is in use.
Use the following formula to calculate the total conver-
sion time for an internally timed conversion in clock
modes 00 and 10 (see the Electrical Characteristics
section as applicable):
total conversion time = t_cnv ✕ n_avg x n_result + t_TS + t_RP
where:
t_cnv = t_acq(max) + t_conv(max)
n_avg = samples per result (amount of averaging)
n_result = number of FIFO results requested; determined
by number of channels being scanned by NSCAN1,
NSCAN0
t_TS = time required for temperature measurement; set
to zero if temp measurement is not requested
t_RP = internal reference wake-up; set to zero if internal
reference is already powered up or external reference is
being used
In clock mode 01, the total conversion time depends on
how long CNVST is held low or high, including any time
required to turn on the internal reference. Conversion
time in externally clocked mode (CKSEL1, CKSEL0 = 11)
depends on the SCLK period and how long CS is held
high between each set of eight SCLK cycles.
Conversion Register
Select active analog input channels, scan modes, and
a single temperature measurement per scan by writing
to the conversion register. Table 2 details channel
selection, the four scan modes, and how to request a
temperature measurement. Request a scan by writing
to the conversion register when in clock mode 10 or 11,
or by applying a low pulse to the CNVST pin when in
clock mode 00 or 01.
A conversion is not performed if it is requested on a
channel that has been configured as CNVST or REF-.
Do not request conversions on channels 8–15 on the
MAX1226 and channels 12–15 on the MAX1228. Set
CHSEL3:CHSEL0 to the lower channel’s binary value. If
the last two channels are configured as a differential
pair and one of them has been reconfigured as CNVST
or REF-, the pair is ignored.
Table 1. Input Data Byte (MSB First)
REGISTER NAME
Conversion
Setup
Averaging
Reset
Unipolar mode (setup)
Bipolar mode (setup)
BIT 7
1
0
0
0
UCH0/1
BCH0/1
BIT 6
CHSEL3
1
0
0
UCH2/3
BCH1/2
BIT 5
CHSEL2
CKSEL1
1
0
UCH4/5
BCH4/5
BIT 4
CHSEL1
CKSEL0
AVGON
1
UCH6/7
BCH6/7
BIT 3
CHSEL0
REFSEL1
NAVG1
RESET
UCH8/9*
BCH8/9*
*Unipolar/bipolar channels 8–15 are only valid on the MAX1228 and MAX1230.
**Unipolar/bipolar channels 12–15 are only valid on the MAX1230.
X = Don’t care.
BIT 2
SCAN1
REFSEL0
NAVG0
X
UCH10/11*
BCH10/11*
BIT 1
SCAN0
DIFFSEL1
NSCAN1
X
UCH12/13**
BCH12/13**
BIT 0
TEMP
DIFFSEL0
NSCAN0
X
UCH14/15**
BCH14/15**
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