LMX2595 高性能宽带合成器可生成 10MHz 至 20GHz 范围内的任何频率。集成加倍器用于生成 15GHz 以上的频率。品质因数为 -236dBc/Hz 的高性能 PLL 和高相位检测器频率可实现非常低的带内噪声和集成抖动。高速 N 分频器没有预分频器,从而显著减少了杂散的振幅和数量。还有一个可减轻整数边界杂散的可编程输入乘法器。
LMX2595 允许用户同步多个器件的输出,并可在 输入和输出之间确定需要延迟的情况下 应用。频率斜升发生器可在自动斜坡生成选项或手动选项中最多合成 2 段斜坡,以实现最大的灵活性。通过快速校准算法可将频率加快至 20μs 以上。LMX2595 增添了对生成或重复 SYSREF(符合 JESD204B 标准)的支持,此 SYSREF 是高速数据转换器的理想低噪声时钟源。此配置中提供了精细的延迟调节(9ps 分辨率),以解决板迹线的延迟差异。
LMX2595 中的输出驱动器在载波频率为 15GHz 时提供高达 7dBm 的输出功率。该器件采用单个 3.3V 电源供电,并具有集成的 LDO,无需板载低噪声 LDO。
器件型号 | 封装 | 封装尺寸(标称值) |
---|---|---|
LMX2595 | VQFN (40) | 6.00mm × 6.00mm |
Changes from B Revision (March 2018) to C Revision
Changes from A Revision (August 2017) to B Revision
Changes from * Revision (June 2017) to A Revision
MIN | MAX | UNIT | ||
---|---|---|---|---|
VCC | Power supply voltage | –0.3 | 3.6 | V |
TJ | Junction temperature | –40 | 150 | °C |
Tstg | Storage temperature | –65 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±2000 | V |
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | ±750 |
MIN | NOM | MAX | UNIT | ||
---|---|---|---|---|---|
VCC | Power supply voltage | 3.15 | 3.3 | 3.45 | V |
TA | Ambient temperature | –40 | 25 | 85 | °C |
TJ | Junction temperature | 125 | °C |
THERMAL METRIC(1) | LMX2595 | UNIT | |
---|---|---|---|
RHA (VQFN) | |||
40 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 30.5 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance (2) | 15.3 | °C/W |
RθJB | Junction-to-board thermal resistance | 5.4 | °C/W |
ψJT | Junction-to-top characterization parameter | 0.2 | °C/W |
ψJB | Junction-to-board characterization parameter | 5.3 | °C/W |
RθJC(bot) | Junction-to-case (bottom) thermal resistance | 0.9 | °C/W |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |||
---|---|---|---|---|---|---|---|---|
POWER SUPPLY | ||||||||
VCC | Supply voltage | 3.15 | 3.3 | 3.45 | V | |||
ICC | Supply current | OUTA_PD = 0, OUTB_PD = 1
OUTA_MUX = OUTB_MUX = 1 OUTA_PWR = 31, CPG=7 fOSC= fPD = 100 MHz, fVCO = fOUT = 14 GHz pOUT = 3 dBm with 50-Ω resistor pullup |
340 | mA | ||||
Power-on reset current | RESET=1 | 170 | ||||||
Power-down current | POWERDOWN=1 | 5 | ||||||
OUTPUT CHARACTERISTICS | ||||||||
pOUT | Single-ended output power(3)(5) | 50-Ω resistor pullup
OUTx_PWR = 50 |
fOUT = 8 GHz | 5 | dBm | |||
fOUT = 15 GHz | 2 | |||||||
1-nH inductor pullup
OUTx_PWR = 50 |
fOUT = 8 GHz | 10 | ||||||
fOUT = 15 GHz | 7 | |||||||
POUT | Single-ended output power with doubler enabled(6) | 50-Ω resistor pullup
OUTx_PWR = 20 VCO2X_EN = 1 DBLR_IBIAS_CTRL1 = 1572 |
fOUT= 15 GHz | 0 | dBm | |||
fOUT= 19 GHz | –4 | |||||||
1-nH inductor pullup
OUTx_PWR = 20 VCO2X_EN = 1 DBLR_IBIAS_CTRL1 = 1572 |
fOUT= 15 GHz | 6 | ||||||
fOUT= 19 GHz | –1 | |||||||
fVCO2X | VCO doubler output range | VCO doubler enabled | DBLR_IBIAS_CTRL1 = 1572 | 15 | 19 | GHz | ||
DBLR_IBIAS_CTRL1 = 3115 | 15 | 20 | GHz | |||||
LVCO2X | VCO doubler noise floor(6) | 50-Ω resistor pullup
OUTx_PWR = 20 DBLR_IBIAS_CTRL1 = 1572 |
fOUT= 18 GHz | –148 | dBc/Hz | |||
Xtalk | Isolation between outputs A and B. Measured on output A | OUTA_MUX = VCO
OUTB_MUX = channel divider |
–50 | dBc | ||||
H1/2 | 1/2 haromnic spur(6) | OUTA_MUX=VCO2X
fVCO = 9 GHz DBLR_IBIAS_CTRL1 = 1572 |
–10 | dBc | ||||
H2 | Second harmonic(5) | OUTA_MUX = VCO
fVCO = 8 GHz |
–20 | dBc | ||||
OUTA_MUX = VCO
fVCO = 11 GHz |
–30 | |||||||
H3 | Third harmonic(5) | OUTA_MUX = VCO
fVCO = 8 GHz |
–50 | dBc | ||||
INPUT SIGNAL PATH | ||||||||
fOSCin | Reference input frequency | OSC_2X = 0 | 5 | 1400 | MHz | |||
OSC_2X = 1 | 5 | 200 | ||||||
vOSCin | Reference input voltage | AC-coupled required (2) | 0.2 | 2 | Vpp | |||
fMULT | Multiplier frequency (only applies when multiplier is enabled) | Input range | 30 | 70 | MHz | |||
Output range | 180 | 250 | ||||||
PHASE DETECTOR AND CHARGE PUMP | ||||||||
fPD | Phase detector frequency(2) | Integer mode | MASH_ORDER = 0 | 0.125 | 400 | MHz | ||
Fractional mode | MASH_ORDER= 1, 2, 3 | 5 | 300 | |||||
MASH_ORDER = 4 | 5 | 240 | ||||||
ICPout | Charge-pump leakage current | CPG = 0 | 15 | nA | ||||
Effective charge pump current. This is the sum of the up and down currents | CPG = 4 | 3 | mA | |||||
CPG = 1 | 6 | |||||||
CPG = 5 | 9 | |||||||
CPG = 3 | 12 | |||||||
CPG = 7 | 15 | |||||||
PNPLL_1/f | Normalized PLL 1/f noise | fPD = 100 MHz, fVCO = 12 GHz(4)(4)(4)(4) | –129 | dBc/Hz | ||||
PNPLL_flat | Normalized PLL noise floor | –236 | dBc/Hz | |||||
VCO CHARACTERISTICS | ||||||||
PNVCO | VCO phase noise | VCO1
fVCO = 8 GHz |
10 kHz | –80 | dBc/Hz | |||
100 kHz | –107 | |||||||
1 MHz | –128 | |||||||
10 MHz | –148 | |||||||
90 MHz | –157 | |||||||
VCO2
fVCO = 9.2 GHz |
10 kHz | –79 | ||||||
100 kHz | –105 | |||||||
1 MHz | –127 | |||||||
10 MHz | –147 | |||||||
90 MHz | –157 | |||||||
VCO3
fVCO = 10.3 GHz |
10 kHz | –77 | ||||||
100 kHz | –104 | |||||||
1 MHz | –126 | |||||||
10 MHz | –147 | |||||||
90 MHz | –157 | |||||||
VCO4
fVCO = 11.3 GHz |
10 kHz | –76 | ||||||
100 kHz | –103 | |||||||
1 MHz | –125 | |||||||
10 MHz | –145 | |||||||
90 MHz | –158 | |||||||
VCO5
fVCO = 12.5 GHz |
10 kHz | –74 | ||||||
100 kHz | –100 | |||||||
1 MHz | –123 | |||||||
10 MHz | –144 | |||||||
90 MHz | –157 | |||||||
VCO6
fVCO = 13.3 GHz |
10 kHz | –73 | ||||||
100 kHz | –100 | |||||||
1 MHz | –122 | |||||||
10 MHz | –143 | |||||||
90 MHz | –155 | |||||||
VCO7
fVCO = 14.5 GHz |
10 kHz | –73 | ||||||
100 kHz | –99 | |||||||
1 MHz | –121 | |||||||
10 MHz | –143 | |||||||
90 MHz | –152 | |||||||
tVCOCAL | VCO calibration speed | Switch across the entire frequency band
fOSC = 200 MHz, fPD = 100 MHz(1) |
No assist | 50 | µs | |||
Partial assist | 35 | |||||||
Close frequency | 20 | |||||||
Full assist | 5 | |||||||
KVCO | VCO gain | 8 GHz | 92 | MHz/V | ||||
9.2 GHz | 91 | |||||||
10.3 GHz | 115 | |||||||
11.3 GHz | 121 | |||||||
12.5 GHz | 195 | |||||||
13.3 GHz | 190 | |||||||
14.5 GHz | 213 | |||||||
|ΔTCL| | Allowable temperature drift when VCO is not recalibrated | RAMP_EN = 0 or RAMP_MANUAL= 1 | 125 | °C | ||||
H2 | VCO second harmonic | fVCO = 8 GHz, divider disabled | –20 | dBc | ||||
H3 | VCO third haromonic | fVCO = 8 GHz, divider disabled | –50 | |||||
SYNC PIN AND PHASE ALIGNMENT | ||||||||
fOSCinSYNC | Maximum usable OSCin with sync pin (Figure 33) | Category 3 | 0 | 100 | MHz | |||
Categories1 and 2 | 0 | 1400 | ||||||
DIGITAL INTERFACE
Applies to SLK, SDI, CSB, CE, RampDir, RampClk, MUXout, SYNC (CMOS Mode), SysRefReq (CMOS Mode) |
||||||||
VIH | High-level input voltage | 1.4 | Vcc | V | ||||
VIL | Low-level input voltage | 0 | 0.4 | V | ||||
IIH | High-level input current | –25 | 25 | µA | ||||
IIL | Low-level input current | –25 | 25 | µA | ||||
VOH | High-level output voltage | MUXout pin | Load current = –10 mA | VCC – 0.4 | V | |||
VOL | Low-level output voltage | Load current = 10 mA | 0.4 | V |