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參數(shù)資料
| 型號： | HMC704LP4E |
| 廠商： | Hittite Microwave Corporation |
| 文件頁數(shù)： | 18/44頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC FRACT-N PLL 16BIT 24QFN |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 整數(shù) N/小數(shù) N 分頻 |
| PLL： | 是 |
| 輸入： | CMOS |
| 輸出： | CMOS |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 1:1 |
| 差分 - 輸入:輸出： | 是/無 |
| 頻率 - 最大： | 8GHz |
| 除法器/乘法器： | 是/無 |
| 電源電壓： | 3.3V，5V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-VQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 24-QFN 裸露焊盤（4x4） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | 1127-1066-6 |
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HMC704LP4E
v03.1211
8 GHz fractionaL-n PLL
For price, delivery, and to place orders: Hittite Microwave Corporation,20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
PD Polarity
“Reg 0Bh”[4]=0 sets the phase detector polarity for use with a passive loop filter together with a VCO with a positive
tuning slope (increasing tuning voltage increases VCO frequency).
“Reg 0Bh”[4]=1 inverts the phase detector polarity. This is most often used if an inverting op-amp is used in an active
loop filter together with a VCO with a positive tuning slope.
charge Pump tri-state
“Reg 0Bh”[5]=”Reg 0Bh”[6]=0 tri-states the charge pump. This effectively freezes charge on the loop filter and allows
the VCO to run open loop.
charge Pump Gain
“Reg 09h”[6:0] and “Reg 09h”[13:7] program current gain settings for the charge pump. Pump ranges can be set from
0uA to 2.54mA in 20uA steps. Charge pump gain affects the loop bandwidth. The product of VCO gain (Kvco) and
charge pump gain (Kcp) can be held constant for VCO’s that have a wide ranging Kvco by adjusting the charge pump
gain. This compensation helps to keep the loop bandwidth constant.
In addition to the normal CP current as described above, there is also an extra output source of current that offers im-
proved noise performance. HiKcp provides an output current that is proportional to the loop filter voltage. This being the
case HiKcp should only be operated with active op-amp loop filters that define the voltage as seen by the charge pump
pin. With 2.5V as observed at the charge pump pin, the HiKcp current is 3.5mA.
There are several configurations that could be used with the HiKcp feature. For lowest noise, HiKcp could be used with-
out the normal charge pump current (the charge pump current would be set to 0). In this case, the loop filter would be
designed with 3.5mA as the effective charge pump current.
Another possible configuration is to operate with both the HiKcp and normal charge pump current sources. In this case
the effective charge pump current would be 3.5mA + programmed normal charge pump current which could offer a
maximum of 6mA.
With passive loop filters the voltage seen by the charge pump pin will vary which would cause the HiKcp current to vary
widely. As such, HiKcp should not be used on passive loop filter implementations.
A simplified diagram of the charge pump is shown in Figure 34. The current gain of the pump in Amps/radian is
equal to the gain setting of this register divided by 2π.
charge Pump offset
“Reg 09h”[20:14] controls the charge pump current offsets. “Reg 09h”[21] and “Reg 09h”[22] enable the UP and DN
offset currents respectively. Normally only one is used at a time. As mentioned earlier charge pump offsets affect
fractional mode linearity and the Lock Detect window selection.
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| HMC704LP4ETR | 制造商:Hittite Microwave Corp 功能描述:IC FRACT-N PLL 16BIT 24QFN |
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