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LTC6948 Datasheet(PDF) 22 Page - Analog Devices

Part # LTC6948
Description  1.5GHz to 7GHz Dual Programmable Gain Downconverting Mixer
PDF  26 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC6948 Datasheet(HTML) 22 Page - Analog Devices

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LTC5556
22
Rev 0
For more information www.analog.com
A memory map of the register contents is shown in
Table 7, with detailed bit descriptions in Table 8. Each
register’s default power-up value is also shown in Table 8,
which is:
• 0dB IF attenuation (maximum gain)
• Full power mode
When the logic level on RP (Pin 19) is low, each chan-
nel may be independently programmed to reduced power
mode via the RP1 and RP2 bits in the SPI. When RP pin
is driven high, both channels are commanded to reduced
power mode and the RP1 and RP2 bits from the SPI are
ignored.
Table 7. Serial Port Register Contents
CHANNEL 2 (8 bits)
MSB
D15
D14
D13
D12
D11
D10
D9
D8
RP2
X
X
IF2[4] IF2[3] IF2[2] IF2[1] IF2[0]
CHANNEL 1 (8 bits)
D7
D6
D5
D4
D3
D2
D1
LSB
D0
RP1
X
X
IF1[4] IF1[3] IF1[2] IF1[1] IF1[0]
Table 8. Serial Port Register Bit Field Summary
BITS
DESCRIPTION
DEFAULT
IF1[4:0]
Ch. 1 IF Attenuator Control
00000 (Max Gain)
RP1
Ch. 1 Reduced Power
0 (Full Power)
IF2[4:0]
Ch. 2 IF Attenuator Control
00000 (Max Gain)
RP2
Ch. 2 Reduced Power
0 (Full Power)
X
Don’t Care (Bits Not Used)
0
Spurious Output Levels
Spurious output levels vs harmonics of the RF and LO are
tabulated in Table 9. The spur levels were measured using
the test circuit shown in Figure 1, with an RF input power
of –6dBm and 3dB of IF attenuation. Table 9a shows the
relative spur levels in full power mode and Table 9b shows
the relative spur levels in reduced power mode. The mixer
spur levels are insensitive to the IF attenuation setting.
The spur frequencies can be calculated using the follow-
ing equation:
fSPUR = (M • fRF) – (N • fLO)
Table 9. IF Output Spur Levels (dBc).
(RF = 3.6GHz, PRF = –6dBm, IF = 270MHz, Low Side LO,
PLO = 0dBm, 3dB IF Attenuation, TC = 25°C)
Table 9a. Full Power Mode
N
0
1
2
3
4
5
M
0
–47
–82
*
–82
–82
1
–79
0
–77
*
*
*
2
*
*
–64
*
*
*
3
*
*
*
–71
*
*
4
–83
*
*
*
*
*
5
–84
–82
*
*
*
*
*Less than –85dBc
Table 9b. Reduced Power Mode
N
0
1
2
3
4
5
M
0
–46
–82
*
–82
–82
1
–78
0
–78
*
*
*
2
–84
*
–64
*
*
*
3
*
*
*
–70
*
*
4
–82
*
*
*
*
*
5
–83
–82
–84
*
*
*
*Less than –85dBc
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