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MT-074 Datasheet(PDF) 2 Page - Analog Devices

Part # MT-074
Description  Differential Drivers for Precision ADCs
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
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MT-074 Datasheet(HTML) 2 Page - Analog Devices

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MT-074
Note that the SHA switches are connected directly to each of the inputs. Switching transients can
be significant, because there is no isolation buffer. The drive amplifier settling time to the
transients must be fast enough so that the amplifier settles to the required accuracy in less than
one-half the sampling period (this settling time must include the effects of any external series
resistance).
The differential input impedance of this structure is dynamic and changes when the SHA
switches between the sample mode and the hold mode. In addition, the impedance is a function
of the analog input frequency.
In the track mode (shown in the figure), the input signal charges and discharges the hold
capacitors, CH. When the circuit switches to the hold mode the switches reverse their positions,
and the voltage across the hold capacitors is transferred to the outputs.
It is highly recommended that this type of input be driven differentially for common-mode
rejection of the switching transients. While it is possible to drive them single-ended (with one
input connected to the appropriate common-mode voltage), degradation in SFDR will occur
because the even-order distortion products are no longer rejected.
Figure 2 (A) shows each of the differential inputs of a typical unbuffered CMOS ADC as well as
the sampling clock. The inputs were driven with a 50
Ω source resistance. Note that a transient
occurs on each edge of the sampling clock because of the switching action previously described.
Figure 2(B) shows the differential input signal to the ADC under the same conditions as (A).
Note that most of the transient current glitches are cancelled because they are common-mode
signals. Note that for cancellation to be optimum the two inputs must be driven from a balanced
source impedance (the real and reactive components of the impedance must be matched).
Differential charge transient is symmetrical around mid-scale and
dominated by linear component
Common-mode transients cancel with equal source impedance
Note: Data Taken with 50
Ω Source Resistances
(A) SINGLE ENDED
(B) DIFFERENTIAL
SAMPLING CLOCK
SAMPLING CLOCK
Differential charge transient is symmetrical around mid-scale and
dominated by linear component
Common-mode transients cancel with equal source impedance
Note: Data Taken with 50
Ω Source Resistances
(A) SINGLE ENDED
(B) DIFFERENTIAL
SAMPLING CLOCK
SAMPLING CLOCK
Figure 2: Typical Single-Ended (A) and Differential
(B) Input Transients of CMOS Switched Capacitor ADC
Page 2 of 5


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