Specifications

V
D
+
V
D
-
V
OS
GND
½×V
OD
= | V
D
+ - V
D
- |
½×V
OD
V
D
-
V
D
+
ADC12D1000RF, ADC12D1600RF
SNAS519G –JULY 2011–REVISED APRIL 2013 www.ti.com
Figure 4-1. LVDS Output Signal Levels
LVDS OUTPUT OFFSET VOLTAGE (V
OS
) is the midpoint between the D+ and D- pins output voltage
with respect to ground; i.e., [(V
D
+) +( V
D
-)]/2. See Figure 4-1.
MISSING CODES are those output codes that are skipped and will never appear at the ADC outputs.
These codes cannot be reached with any input value.
MSB (MOST SIGNIFICANT BIT) is the bit that has the largest value or weight. Its value is one half of full
scale.
NEGATIVE FULL-SCALE ERROR (NFSE) is a measure of how far the first code transition is from the
ideal 1/2 LSB above a differential −V
IN
/2 with the FSR pin low. For the ADC12D1600/1000RF the
reference voltage is assumed to be ideal, so this error is a combination of full-scale error and reference
voltage error.
NOISE FLOOR DENSITY is a measure of the power density of the noise floor, expressed in dBFS/Hz and
dBm/Hz. '0 dBFS' is defined as the power of a sinusoid which precisely uses the full-scale range of the
ADC.
NOISE POWER RATIO (NPR) is the ratio of the sum of the power inside the notched bins to the sum of
the power in an equal number of bins outside the notch, expressed in dB.
OFFSET ERROR (V
OFF
) is a measure of how far the mid-scale point is from the ideal zero voltage
differential input.
Offset Error = Actual Input causing average of 8k samples to result in an average code of 2047.5.
OUTPUT DELAY (t
OD
) is the time delay (in addition to Latency) after the rising edge of CLK+ before the
data update is present at the output pins.
OVER-RANGE RECOVERY TIME is the time required after the differential input voltages goes from ±1.2V
to 0V for the converter to recover and make a conversion with its rated accuracy.
PIPELINE DELAY (LATENCY) is the number of input clock cycles between initiation of conversion and
when that data is presented to the output driver stage. The data lags the conversion by the Latency plus
the t
OD
.
POSITIVE FULL-SCALE ERROR (PFSE) is a measure of how far the last code transition is from the ideal
1-1/2 LSB below a differential +V
IN
/2. For the ADC12D1600/1000RF the reference voltage is assumed to
be ideal, so this error is a combination of full-scale error and reference voltage error.
SIGNAL TO NOISE RATIO (SNR) is the ratio, expressed in dB, of the rms value of the fundamental for a
single-tone to the rms value of the sum of all other spectral components below one-half the sampling
frequency, not including harmonics or DC.
SIGNAL TO NOISE PLUS DISTORTION (S/(N+D) or SINAD) is the ratio, expressed in dB, of the rms
value of the fundamental for a single-tone to the rms value of all of the other spectral components below
half the input clock frequency, including harmonics but excluding DC.
SPURIOUS-FREE DYNAMIC RANGE (SFDR) is the difference, expressed in dB, between the rms values
of the input signal at the output and the peak spurious signal, where a spurious signal is any signal
present in the output spectrum that is not present at the input, excluding DC.
26 Specification Definitions Copyright © 2011–2013, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Links: ADC12D1000RF ADC12D1600RF