ADL5960ACCZ-R2 datasheet(25/32 Pages) AD

25 / 32 page

Data Sheet

ADL5960

APPLICATIONS INFORMATION

analog.com

Rev. A | 25 of 32

SDIO Interface

Figure 69. Simplified SDIO Interface

The ADL5960 implements a 3-wire SPI that uses a single line for

transmission/reception of data. When receiving data, that is, during

a write operation to the device, the transmitter output becomes

high-impedance such that the transmitting device can pull the data

line low or high as desired. To connect this interface to an SPI con-

troller using a 4-wire interface, with separate data input and data

output lines, a series current limiting resistor as shown in Figure 70

is recommended to isolate the controller and target outputs. This

resistor provides protection in the event that both outputs become

simultaneously active.

Figure 70. SPI 4-Wire to 3-Wire Interfacing

TEMP Interface

In addition to the on-chip digital thermometer, the TEMP pin can be

used to monitor the die temperature by applying a known reference

current into the pin and measure the pin voltage relative to ground.

An injected current of 42 µA results in a nominal voltage of 0.775 V

at 25°C and a temperature slope of approximately −1.54 mV/°C.

Figure 71. Temperature Diode Interface

LO INTERFACE CONFIGURATION

The LO interface supports a bypass mode and four different multi-

ply/divide modes that are selectable through register 0x20 in the

SPI interface. Each of these operating modes is discussed in

the Bypass Mode (Bypass = 1) section to Multiply by 4 Mode

(LOMODE = 3) section.

Bypass Mode (Bypass = 1)

The LO signal is routed directly to the internal downconversion

mixers, bypassing the frequency multipliers and dividers. The LO

multipliers and dividers and the OF interface are disabled. The

ADL5960 achieves the widest bandwidth and highest dynamic

range in this mode.

Divide by 2 Mode (LOMODE = 0)

The frequency of the LO input signal is divided by two before

being passed through the offset mixer and supplied to the down-

conversion mixers. If supported by the frequency range of the RF

signal, this LO operating mode provides a means to extend the

VNA measurements frequency range below the minimum frequency

supported by the LO source itself. This operating mode can be

used either with the offset frequency interface enabled or disabled.

Multiply by 1 Mode (LOMODE = 1)

The LO signal bypasses the LO multipliers and dividers but is

routed through the offset mixer to the downconversion mixers.

The intended use is with the offset frequency interface enabled.

Although it can be used with the offset frequency interface disabled,

improved performance is achieved by selecting the bypass mode

(bypass = 1) instead.

Multiply by 2 Mode (LOMODE = 2)

The LO signal is passed through a frequency doubler, a program-

mable band-pass filter, and an offset mixer to the downconversion

mixers. The band-pass filter suppresses the subharmonics in the

doubler output signal and can be tuned by programming the CT2

bit field in Register 0x21. Table 7 lists the recommended setting

for different 2× LO frequency ranges. All CT2 settings are valid.

For CT2 settings not shown in the table, for example CT2=2,

CT2=5, ... CT2=30, the minimum and maximum 2× fLO can be

linearly interpolated based on the table entries shown. The multiply

ADL5960ACCZ-R2 数据表(PDF) 25 Page - Analog Devices

ADL5960ACCZ-R2 数据表(HTML) 25 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

数据表下载