參數(shù)資料
型號(hào)： MAX5898EGK+D
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 17/33頁(yè)
文件大?。?/td> 0K
描述： IC DAC 16BIT DUAL 500MSPS 68-QFN
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 30
設(shè)置時(shí)間： 11ns
位數(shù)： 16
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 2
電壓電源： 模擬和數(shù)字
功率耗散（最大）： 831mW
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 68-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 68-QFN 裸露焊盤（10x10）
包裝： 管件
輸出數(shù)目和類型： 2 電流，單極
采樣率（每秒）： 500M
MAX5898
16-Bit, 500Msps, Interpolating and Modulating
Dual DAC with Interleaved LVDS Inputs
24
______________________________________________________________________________________
Digital Modulator
The MAX5898 features digital modulation at frequencies
of fIM / 2 and fIM / 4, where fIM is the data rate at the
input to the modulator. fIM equals fDAC in 1x, 2x, and 4x
interpolation modes. In 8x interpolation mode, fIM equals
fDAC / 2. The output rate of the modulator is always the
same as the input data rate to the modulator, fIM.
In complex modulation mode, data from the second
interpolation filter is frequency-mixed with the on-chip
in-phase and quadrature (I/Q) local oscillator (LO).
Complex modulation provides the benefit of image
sideband rejection.
In the fLO = fIM / 4 mode, real or complex modulation
can be used. The modulator multiplies successive input
data samples by the sequence [1, 0, -1, 0] for a cos(
ωt).
The modulator modulates the input signal up to fIM / 4,
creating upper and lower images around fIM / 4. The
quadrature LO sin(
ωt) is realized by delaying the cos(ωt)
sequence by one clock cycle. Using complex modula-
tion, complex IF is generated. The complex IF combined
with an external quadrature modulator provides image
rejection. The sign of the LO can be changed to allow
the user to select whether the upper or the lower image
should be rejected (bit 1 of register 01h).
When fIM / 2 is chosen as the LO frequency, the input
signal is multiplied by [-1, 1] on both channels. This pro-
duces images around fIM / 2. The complex image-reject
modulation mode is not available for this LO frequency.
The outputs of the modulator can be expressed as:
in complex modulation, e+jwt
in complex modulation, e-jwt
For real modulation, the outputs of the modulator can
be expressed as:
where
ω = 2 x π x fLO.
If more than one MAX5898 is used, their LO phases
can be synchronized by simultaneously releasing
RESET. This sets the MAX5898 to its predefined initial
phase.
Device Reset
The MAX5898 can be reset by holding the RESET pin
low for 10ns. This will program the control registers to
their default values in Table 2. During power-on, RESET
must be held low until all power supplies have stabi-
lized. Alternately, programming bit 5 of address 00h to
a logic-high also resets the MAX5898.
II
QQ
OD
ID
OD
ID
tt
t
tt
t
()= () × ()
cos
ω
II
Q
QI
Q
OD
ID
OD
ID
tt
t
tt
t
()= () × ()+ () × ()
cos
sin
cos
ωω
II
Q
QI
Q
OD
ID
OD
ID
tt
t
tt
t
()= () × ()
( ) × ()
()= () × ()+ () × ()
cos
sin
cos
ωω
Figure 13. (a) Modulator in Complex Modulation Mode; (b) Modulator in Real Modulation Mode
sin(
ωt)
sin(
ωt)
cos(
ωt)
cos(
ωt)
I-CHANNEL
INPUT DATA
TO
FIR3
(a)
Q-CHANNEL
INPUT DATA
I-CHANNEL
OUTPUT DATA
Q-CHANNEL
OUTPUT DATA
(b)
∑
sin(
ωt)
sin(
ωt)
cos(
ωt)
cos(
ωt)
I-CHANNEL
INPUT DATA
TO
FIR3
Q-CHANNEL
INPUT DATA
I-CHANNEL
OUTPUT DATA
Q-CHANNEL
OUTPUT DATA
∑
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