AD9891 datasheet(9/58 Pages) AD

9 / 58 page

REV. A

AD9891/AD9895

–9–

SPECIFICATION DEFINITIONS

Differential Nonlinearity (DNL)

An ideal ADC exhibits code transitions that are exactly 1 LSB

apart. DNL is the deviation from this ideal value. Thus, every

code must have a finite width. No missing codes guaranteed to

12-bit resolution indicates that all 4096 codes, respectively,

must be present over all operating conditions.

Peak Nonlinearity

Peak nonlinearity, a full signal chain specification, refers to the

peak deviation of the output of the AD9891/AD9895 from a

true straight line. The point used as “zero scale” occurs 0.5 LSB

before the first code transition. “Positive full scale” is defined as

a level 1 and 0.5 LSB beyond the last code transition. The

deviation is measured from the middle of each particular output

code to the true straight line. The error is then expressed as a

EQUIVALENT CIRCUITS

percentage of the 2 V ADC full-scale signal. The input signal is

always appropriately gained up to fill the ADC’s full-scale range.

Total Output Noise

The rms output noise is measured using histogram techniques. The

standard deviation of the ADC output codes is calculated in LSB

and represents the rms noise level of the total signal chain at the

specified gain setting. The output noise can be converted to an

equivalent voltage, using the relationship 1 LSB = (ADC Full

Scale/2

n codes) when n is the bit resolution of the ADC. For the

AD9891, 1 LSB is 2 mV, while for the AD9895, 1 LSB is 0.5 mV.

Power Supply Rejection (PSR)

The PSR is measured with a step change applied to the supply

pins. The PSR specification is calculated from the change in the

data outputs for a given step change in the supply voltage.

HVDD OR

RGVDD

HVSS OR

RGVSS

OUTPUT

RG, H1–H4

ENABLE

Figure 4. H1–H4, RG Drivers

AVDD1

AVSS1

Figure 1. CCDIN

DVDD

DVSS

DRVSS

DRVDD

THREE-

STATE

DATA

DOUT

Figure 2. Digital Data Outputs

DVDD

DVSS

330

Figure 3. Digital Inputs

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