All ac specifications tested by driving ENCODE and
ENCODE
differentially, with the analog input applied to A
IN
X1 and A
IN
X2 tied to ground.
2
SFDR enabled (SFDR = 1) for DNL and INL specifications.
3
Gain error measured at 10.3 MHz.
4
Input VSWR, see TPC 14.
5
See Figure 1, Timing Diagram.
6
t
V
and t
PD
are measured from the transition points of the ENCODE input to the 50%/50% levels of the digital outputs swing. The digital output load during
test is not to exceed an ac load of 10 pF or a dc current of
±
40 A.
7
Supply voltages should remain stable within
±
5% for normal operation.
8
Power dissipation measures with encode at rated speed.
9
Analog input signal power at –1 dBFS; signal-to-noise (SNR) is the ratio of signal level to total noise (first six harmonics removed). ENCODE = 125 MSPS,
SFDR mode = 1. SNR is reported in dBFS, related back to converter full-scale.
10
Analog input signal power at –1 dBFS; signal-to-noise and distortion (SINAD) is the ratio of signal level to total noise + harmonics. ENCODE = 125 MSPS.
SINAD is reported in dBFS, related back to converter full-scale.
11
Analog input signal equals –1 dBFS; SFDR is ratio of converter full-scale to worst spur.
12
Both input tones at –7 dBFS; two-tone intermodulation distortion (IMD) rejection is the ratio of either tone to the worst third order intermod product.
13
Channel-to-channel isolation tested with A channel/50
Ω
terminated (A
IN
A2) grounded and a full-scale signal applied to B channel (A
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