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MX7705 Datasheet(PDF) 25 Page - Maxim Integrated Products

Part No. MX7705
Description  16-Bit, Low-Power, 2-Channel, Sigma-Delta ADC
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MX7705 Datasheet(HTML) 25 Page - Maxim Integrated Products

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Test Register
This register is reserved for factory testing of the device.
For proper operation of the MX7705, do not change this
register from its default power-on reset values.
Offset and Gain-Calibration Registers
The MX7705 contains one offset register and one gain
register for each input channel. Each register is 24 bits
wide and can be written and read. The offset registers
store the calibration coefficients resulting from a zero-
scale calibration, and the gain registers store the cali-
bration coefficients resulting from a full-scale
calibration. The data stored in these registers are 24-bit
straight binary values representing the offset or gain
errors associated with the selected channel. A 24-bit
read or write operation can be performed on the cali-
bration registers for any selected channel. During a
write operation, 24 bits of data must be written to the
register, or no data is transferred.
Write to the calibration registers in normal mode only.
After writing to the calibration registers, the devices
implement the new offset and gain-register calibration
coefficients at the beginning of a new acquisition. To
ensure the results are valid, discard the first conversion
result after writing to the calibration registers.
To ensure that a conversion is not made using invalid
calibration data, drive FSYNC high prior to writing to the
calibration registers, and then release FSYNC low to ini-
tiate conversion.
Power-On Reset
At power-up, the serial-interface, logic, digital-filter, and
modulator circuits are reset. The registers are set to
their default values. The device returns to wait for a
write to the communications register. For accurate
measurements, perform calibration routines after
power-up. Allow time for the external reference and
oscillator to start up before starting calibration. See the
Typical Operating Characteristics for typical external-
oscillator startup times.
16-Bit, Low-Power, 2-Channel,
Sigma-Delta ADC
______________________________________________________________________________________
25
Table 13. Output Data Rate and Notch Frequency vs. Filter Select and CLKIN Frequency
CLKIN FREQUENCY
fCLKIN (MHz)*
CLK
FS1
FS0
OUTPUT DATA RATE
(FIRST NOTCH) (Hz)
-3dB FILTER CUTOFF**
(Hz)
1
0
0
0
20
5.24
1
0
0
1
25
6.55
1
0
1
0
100
26.20
1
0
1
1
200
52.40
2.4576
1
0
0
50
13.10
2.4576
1
0
1
60
15.70
2.4576
1
1
0
250
65.50
2.4576
1
1
1
500
131.00
*
These values are given for CLKDIV = 0. External clock frequency, fCLKIN, can be two times the values in this column if CLKDIV = 1.
**
The filter -3dB filter cutoff frequency = 0.262 x filter first-notch frequency.
Table 12. Clock Register
FIRST BIT (MSB)
(LSB)
FUNCTION
RESERVED
CLKOUT
DISABLE
CLOCK
DIVIDER
CLOCK
SELECT
FILTER SELECT
Name
MXID
ZERO
ZERO
CLKDIS
CLKDIV
CLK
FS1
FS0
Defaults
1
0
0
0
0
1
0
1


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