MAX1215(2005) 查看數據表（PDF） - Maxim Integrated

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MAX1215
(Rev.:2005)

1.8V, 12-Bit, 250Msps ADC for Broadband Applications

Maxim Integrated 

1.8V, 12-Bit, 250Msps 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 MAX1215 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 MAX1215 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

MAX1215 was determined for 50MHz noise bandwidth

signals, simulating a typical cable signal environment

(see the Typical Operating Characteristics for test details

and results), and 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 MAX1215.

Adjusting an application to a lower resolution has been

simplified by maintaining an identical pinout for all mem-

bers of this high-speed family. See the Pin-Compatible

Versions table on the first page of this data sheet 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

AVCC 1

AGND 2

EP

REFIO 3

REFADJ 4

AGND 5

AVCC 6

AGND 7

INP 8

INN 9

AGND 10

AVCC 11

AVCC 12

AVCC 13

AVCC 14

AGND 15

AGND 16

CLKDIV 17

MAX1215

51 D8P

50 D8N

49 D7P

48 D7N

47 D6P

46 D6N

45 OGND

44 OVCC

43 DCLKP

42 DCLKN

41 OVCC

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

18 ______________________________________________________________________________________

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