The charge pump current (ICP) " />
參數(shù)資料
型號(hào)： AD9957BSVZ-REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 30/64頁(yè)
文件大?。?/td> 0K
描述： IC DDS 1GSPS 14BIT IQ 100TQFP
產(chǎn)品培訓(xùn)模塊： Direct Digital Synthesis Tutorial Series (1 of 7): Introduction
Direct Digital Synthesizer Tutorial Series (7 of 7): DDS in Action
Direct Digital Synthesis Tutorial Series (3 of 7): Angle to Amplitude Converter
Direct Digital Synthesis Tutorial Series (6 of 7): SINC Envelope Correction
Direct Digital Synthesis Tutorial Series (4 of 7): Digital-to-Analog Converter
Direct Digital Synthesis Tutorial Series (2 of 7): The Accumulator
標(biāo)準(zhǔn)包裝： 1,000
分辨率（位）： 14 b
主 fclk： 1GHz
調(diào)節(jié)字寬（位）： 32 b
電源電壓： 1.8V, 3.3V
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 100-TQFP 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 100-TQFP-EP（14x14）
包裝： 帶卷 (TR)
配用： AD9957/PCBZ-ND - BOARD EVAL AD9957 QUADRATURE MOD
AD9957
Data Sheet
Rev. C | Page 36 of 64
PLL CHARGE PUMP
The charge pump current (ICP) is programmable to provide the
user with additional flexibility to optimize the PLL performance.
Table 8 lists the bit settings vs. the nominal charge pump
current.
Table 8. PLL Charge Pump Current
ICP (CFR3<21:19>)
Charge Pump Current, ICP (μA)
000
212
001
237
010
262
011
287
100
312
101
337
110
363
111
387
EXTERNAL PLL LOOP FILTER COMPONENTS
The PLL_LOOP_FILTER pin provides a connection interface to
attach the external loop filter components. The ability to use
custom loop filter components gives the user more flexibility to
optimize the PLL performance. The PLL and external loop filter
components are shown in Figure 52.
PFD
CP
PLL_LOOP_FILTER
VCO
÷N
PLL OUT
PLL IN
AVDD
REFCLK PLL
2
R1
C1
C2
06384-
030
Figure 52. REFCLK PLL External Loop Filter
In the prevailing literature, this configuration yields a third-
order, Type II PLL. To calculate the loop filter component
values, begin with the feedback divider value (N), the gain of
the phase detector (KD), and the gain of the VCO (KV) based on
the programmed VCO SEL bit settings (see Table 1 for KV). The
loop filter component values depend on the desired open-loop
bandwidth (fOL) and phase margin (φ), as follows:
( )
+
=
φ
K
Nf
π
R1
V
D
OL
sin
1
(7)
( )
(
)2
2
tan
OL
V
D
f
N
K
C1
π
φ
=
(8)
( )
( )
=
φ
f
π
N
K
C2
OL
V
D
cos
sin
1
)
2
(
2
(9)
where:
KD equals the programmed value of ICP.
KV is taken from Table 1.
Ensure that proper units are used for the variables in Equation 7
through Equation 9. ICP must be in amps, not μA as appears in
Table 8; KV must be in Hz/V, not MHz/V as listed in Table 1; the
loop bandwidth (fOL) must be in Hz; the phase margin (φ) must
be in radians.
For example, suppose the PLL is programmed such that
ICP = 287 μA, KV = 625 MHz/V, and N = 25. If the desired loop
bandwidth and phase margin are 50 kHz and 45°, respectively,
the loop filter component values are R1 = 52.85 , C1 = 145.4 nF,
and C2 = 30.11 nF.
PLL LOCK INDICATION
When the PLL is in use, the PLL_LOCK pin provides an active
high indication that the PLL has locked to the REFCLK input
signal. When the PLL is bypassed, the PLL_LOCK pin defaults
to Logic 0.
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