ADS-119MM Murata Power Solutions Inc, ADS-119MM Datasheet - Page 4

• Manufacturer Part Number: ADS-119MM
• Description: Analog To Digital Converter
• Manufacturer: Murata Power Solutions Inc

(Refer to Figures 3 and 4, Table 1)
DATEL
CALIBRATION PROCEDURE
Any offset and/or gain calibration procedures should not be implemented
A/D converters are calibrated by positioning their digital outputs exactly
Offset adjusting for the ADS-119 is normally accomplished at the point
Gain adjusting is accomplished when all bits are 1's and the LSB just
ntil devices are fully warmed up. To avoid interaction, offset must be
adjusted before gain. The ranges of adjustment for the circuits in Figure
3 and 4 are guaranteed to compensate for the ADS-119's initial accuracy
errors and may not be able to compensate for additional system errors.
on the transition point between two adjacent digital output codes. This can
be accomplished by connecting LED's to the digital outputs and adjusting
until certain LED's "fl icker" equally between on and off. Other approaches
employ digital comparators or microcontrollers to detect when the outputs
change from one code to the next.
where the MSB is a 1 and all other output bits are 0's and the LSB just
changes from a 0 to a 1. This digital output transition ideally occurs when
the applied analog input is +½ LSB (+366μV).
changes from a 1 to a 0. This transition ideally occurs when the analog
input is at +full scale minus 1 ½ LSB's (+1.4989V).
®
INTERNAL EOC
INTERNAL S/H
CONVERT
START
VALID
DATA
DATA
Scale is approximately 5ns per division.
INVALID DATA
®
50ns typ.
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N
10ns typ.
15ns typ.
65ns typ.
Hold
DATA N-1 VALID
Conversion Time
55ns typ.
40ns typ.
Figure 2. ADS-119 Timing Diagram
35ns typ.
10ns typ.
±5ns
Acquisition Time
37ns max.
30ns min.
35ns typ.
INVALID DATA
Zero/Offset Adjust Procedure
1. Apply a train of pulses to the START CONVERT input (pin 16) so the con-
2. Apply +366μV to the ANALOG INPUT (pin 19).
3. Adjust the offset potentiometer until the output bits are 1000 0000 0000
Gain Adjust Procedure
1. Apply +1.4989V to the ANALOG INPUT (pin 19).
2. Adjust the gain potentiometer until all output bits are 1's and the LSB
3. To confi rm proper operation of the device, vary the input signal to obtain
12-Bit, 10MHz, Low-Power Sampling A/D Converters
45ns typ.
60ns typ.
verter is continuously converting.
and the LSB fl ickers between 0 and 1.
fl ickers between 1 and 0.
the output coding listed in Table 1.
20ns typ.
N+1
Hold
DATA N VALID
83ns max.
40ns typ.
72ns min.
80ns typ.
±5ns
31 Mar 2011 MDA_ADS-119.B02 Page 4 of 9
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ADS-119