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                                                                                                         Design Solutions 11
                                                                                                                November 1999

Testing Linearity of the LTC2400 24-Bit No Latency TM
A/D Converter
Help from the Nineteenth Century

by Jim Williams

Introduction                                                                  follower is required to unload the KVD without introducing
                                                                              significant loading error. Now, our KVD looks like Figure 3.
Verifying the linearity of the LTC2400 analog to digital
converter requires special considerations. Typical
nonlinearity is only 2ppm (0.0002%). Bench testing this                                        10k         2k          400       80
necessitates some form of voltage source that produces                                 INPUT

equal amplitude output steps for incremental digital in-
puts. Additionally, for measurement confidence, it is de-
sirable that the source be substantially more linear than
the 2ppm requirement. This is, of course, a stringent
demand and painfully close to the state of the art.
The most linear "D to A" converter is also one of the oldest:
Lord Kelvin's Kelvin-Varley divider (KVD), in its most
developed form, is linear to 0.1ppm. This manually switched
device features ten million individual dial settings ar-                                                                                    80
                                                                                                                                                       OUT
ranged in seven decades. It may be thought of as a
                                                                                                                                            80
3-terminal potentiometer with fixed "end-to-end" resis-
tance and a 7-decade switched wiper position (Figure 1).


                                        SEVEN-DECADE SWITCHED
                   R = 100k             WIPER POSITION PERMITS
                                        SETTING TO 0.1ppm LINEARITY


                                                               DSOL11 F01


                                                                                     COMMON                                                    DSOL11 F02
               Figure 1. Conceptual Kelvin-Varley Divider
                                                                              Figure 2. A 4-Decade Kelvin-Varley Divider. Additional Decades
The actual construction of a 0.1ppm KVD is more artistry                      Are Implemented By Opening Last Switch, Deleting Two
                                                                              Associated 80 Values and Continuing 

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