MAX1213 Datasheet, PDF (18/20 Pages) Maxim Integrated Products – 1.8V, 12-Bit, 170Msps ADC for Broadband Applications

1.8V, 12-Bit, 170Msps ADC for
Broadband Applications
Noise Power Ratio (NPR)
NPR is commonly used to characterize the return path of
cable systems where the signals are typically individual
quadrature amplitude-modulated (QAM) carriers with a
frequency spectrum similar to noise. Numerous such
carriers are operated in a continuous spectrum, generat-
ing a noise-like signal, which covers a relatively broad
bandwidth. To test the MAX1213 for NPR, a “noise-like”
signal is passed through a high-order bandpass filter to
produce an approximately square spectral pedestal of
noise with about the same bandwidth as the signals
being simulated. Following the bandpass filter, the signal
is passed through a narrow band-reject filter to produce
a deep notch at the center of the noise pedestal. Finally,
this signal is applied to the MAX1213 and its digitized
results analyzed. The RMS noise power of the signal
inside the notch is compared with the RMS noise level
outside the notch using an FFT. Note that the NPR test
requires sufficiently long data records to guarantee a
suitable number of samples inside the notch. NPR for the
MAX1213 was determined for 50MHz noise bandwidth
signals, simulating a typical cable signal environment
(see the Typical Operating Characteristics for test details
and results) with a notch frequency of 28.8MHz.
Pin-Compatible Lower
Speed/Resolution Versions
Applications that require lower resolution and/or higher
speed can refer to other family members of the
MAX1213. Adjusting an application to a lower resolution
has been simplified by maintaining an identical pinout
for all members of this high-speed family. See the
Pin-Compatible Versions table for a selection of different
resolution and speed grades.
TOP VIEW
Pin Configuration
68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52
AV_CC 1
AGND 2
EP
REFIO 3
REFADJ 4
AGND 5
AV_CC 6
AGND 7
INP 8
INN 9
AGND 10
AV_CC 11
AV_CC 12
AV_CC 13
AV_CC 14
AGND 15
AGND 16
CLKDIV 17
MAX1213
51 D8P
50 D8N
49 D7P
48 D7N
47 D6P
46 D6N
45 OGND
44 OV_CC
43 DCLKP
42 DCLKN
41 OV_CC
40 D5P
39 D5N
38 D4P
37 D4N
36 D3P
35 D3N
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
QFN
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